DESCRIPTION
The skid control ECU (brake actuator assembly) measures the speed of each wheel by receiving signals from each speed sensor.
These signals are used for recognizing that all four wheels are operating properly.
Therefore, signals from all wheels must be equal.
|
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
|---|---|---|---|
|
C1237 | Speed Sensor Rotor Faulty |
Any of the following is detected:
|
|
|
Vehicle Condition | |||||
|---|---|---|---|---|---|
|
Pattern 1 | Pattern 2 |
Pattern 3 | Pattern 4 | ||
|
Diagnosis Condition | - |
- | - |
- | - |
|
Malfunction Status | Discrepancy among four wheel speed sensor output. |
â—‹ | - |
- | - |
|
Abnormal pulse signals from 3 or more sensors. |
- | â—‹ |
- | - | |
|
Continuous ABS control is performed. |
- | - |
â—‹ | - | |
|
VSC control is performed. |
- | - |
- | â—‹ | |
|
Detection Time | - |
- | 60 seconds or more |
5 seconds or more | |
|
Number of Trips | 1 trip |
1 trip | 1 trip |
1 trip | |
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
WIRING DIAGRAM
Refer to DTCs C1330, C1331, C1332, C1333, C1464, C1465, C1466 and C1467.
Click here 
CAUTION / NOTICE / HINT
NOTICE:
When replacing the skid control ECU (brake actuator assembly), perform system variant learning and acceleration sensor zero point calibration.
Click here
HINT:
When C1330, C1331, C1332, C1333, C1464, C1465, C1466 and/or C1467 is output together with C1237, inspect and repair the trouble areas indicated by C1330, C1331, C1332, C1333, C1464, C1465, C1466 and/or C1467 first.
Click here
PROCEDURE
| 1. |
CHECK DTC |
(a) Check the DTCs that are output.
Chassis > ABS/VSC/TRAC/EPB > Trouble Codes|
Result | Proceed to |
|---|---|
|
C1237 and C1330, C1331, C1332, C1333, 1464, C1465, C1466, C1467 are output simultaneously |
A |
| C1237 is output |
B |
| A |
 | GO TO DTCS (C1330, C1331, C1332, C1333, 1464, C1465, C1466 and/or C1467) |
|
| 2. |
CHECK TIRES |
(a) Check the size and condition of all four tires.
Click here
HINT:
The DTC is output when tire deformation or a difference in tire size is detected.
OK:
The diameter and tire pressure of all four tires are the same.
| NG | | REPLACE TIRES SO THAT ALL FOUR TIRES ARE THE SAME SIZE |
|
| 3. |
READ VALUE USING TECHSTREAM (SPEED SENSOR) |
(a) Connect the Techstream to the DLC3.
(b) Start the engine.
(c) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Data List.
Chassis > ABS/VSC/TRAC/EPB > Data List|
Tester Display | Measurement Item |
Range | Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
FR Wheel Speed | Front wheel speed sensor RH reading |
Min.: 0 km/h (0 mph), Max.: 326.4 km/h (203 mph) |
Vehicle stopped: 0 km/h (0 mph) |
When driving at constant speed: No large fluctuations |
|
FL Wheel Speed | Front wheel speed sensor LH reading |
Min.: 0 km/h (0 mph), Max.: 326.4 km/h (203 mph) |
Vehicle stopped: 0 km/h (0 mph) |
When driving at constant speed: No large fluctuations |
|
RR Wheel Speed | Rear wheel speed sensor RH reading |
Min.: 0 km/h (0 mph), Max.: 326.4 km/h (203 mph) |
Vehicle stopped: 0 km/h (0 mph) |
When driving at constant speed: No large fluctuations |
|
RL Wheel Speed | Rear wheel speed sensor LH reading |
Min.: 0 km/h (0 mph), Max.: 326.4 km/h (203 mph) |
Vehicle stopped: 0 km/h (0 mph) |
When driving at constant speed: No large fluctuations |
|
Tester Display |
|---|
| FR Wheel Speed |
|
FL Wheel Speed |
| RR Wheel Speed |
|
RL Wheel Speed |
(d) Check the speed sensor output value.
OK:
The output value changes in accordance with the vehicle speed.
|
Result | Proceed to |
|---|---|
|
OK | A |
|
NG (The output value for front speed sensor RH does not change in accordance with the vehicle speed) |
B |
| NG (The output value for front speed sensor LH does not change in accordance with the vehicle speed) |
C |
| NG (The output value for rear speed sensor RH (rear axle hub and bearing assembly RH) does not change in accordance with the vehicle speed) |
D |
| NG (The output value for rear speed sensor LH (rear axle hub and bearing assembly LH) does not change in accordance with the vehicle speed) |
E |
| NG (The output value of 2 or more sensors does not change in accordance with the vehicle speed) |
F |
| B |
| GO TO STEP 5 |
| C |
| GO TO STEP 19 |
| D |
| GO TO STEP 33 |
| E |
| GO TO STEP 44 |
| F |
| REPLACE BRAKE ACTUATOR ASSEMBLY |
|
| 4. |
PERFORM TEST MODE INSPECTION (SIGNAL CHECK) |
(a) Turn the engine switch off.
(b) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Utility / Signal Check.
(c) Perform the sensor check using Test Mode (Signal Check) Procedure.
Click here
|
Tester Display |
|---|
| Signal Check |
OK:
All Test Mode (Signal Check) inspection items change from incomplete to complete.
|
Result | Proceed to |
|---|---|
|
OK | A |
|
NG (The Test Mode (Signal Check) inspection item for front speed sensor RH does not change from incomplete to complete) |
B |
| NG (The Test Mode (Signal Check) inspection item for front speed sensor LH does not change from incomplete to complete) |
C |
| NG (The Test Mode (Signal Check) inspection item for rear speed sensor RH (rear axle hub and bearing assembly RH) does not change from incomplete to complete) | D |
|
NG (The Test Mode (Signal Check) inspection item for rear speed sensor LH (rear axle hub and bearing assembly LH) does not change from incomplete to complete) | E |
|
NG (The Test Mode (Signal Check) inspection item for 2 or more sensors does not change from incomplete to complete) |
F |
| A |
| USE SIMULATION METHOD TO CHECK |
| B |
| GO TO STEP 5 |
| C |
| GO TO STEP 19 |
| D |
| GO TO STEP 33 |
| E |
| GO TO STEP 44 |
| F |
| REPLACE BRAKE ACTUATOR ASSEMBLY |
| 5. |
CHECK FRONT SPEED SENSOR RH INSTALLATION |
| (a) Turn the engine switch off. |
|
(b) Check the front speed sensor RH installation.
OK:
There is no clearance between the front speed sensor RH and the front steering knuckle RH.
The installation bolt is tightened properly.
Torque
8.5 N*m (87 kgf*cm, 75 in.*lbf)
| NG | | REINSTALL OR REPLACE FRONT SPEED SENSOR RH |
|
| 6. |
CHECK FRONT SPEED SENSOR RH (CHECK FOR FOREIGN MATTER) |
(a) Remove the front speed sensor RH.
Click here
(b) Check the front speed sensor RH tip.
OK:
The front speed sensor RH tip is free of scratches, oil, and foreign matter.
NOTICE:
Click here
| Result |
Proceed to |
|---|---|
| OK (w/o AVS) |
A |
| OK (w/ AVS) |
B |
| NG | C |
| B |
| GO TO STEP 12 |
| C |
| CLEAN OR REPLACE FRONT SPEED SENSOR RH |
|
| 7. |
INSPECT BRAKE ACTUATOR ASSEMBLY (POWER SOURCE CIRCUIT) |
| (a) Make sure that there is no looseness at the locking part and the connecting part of the connectors. OK: The connector is securely connected. |
|
(b) Disconnect the A59 front speed sensor RH connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Turn the engine switch on (IG).
(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A59-1 (FR+) - Body ground |
Engine switch on (IG) |
11 to 14 V |
| NG | | GO TO STEP 11 |
|
| 8. |
INSPECT BRAKE ACTUATOR ASSEMBLY (GROUND CIRCUIT) |
| (a) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
| NG | | GO TO STEP 10 |
|
| 9. |
CHECK FRONT SPEED SENSOR ROTOR RH (CHECK FOR FOREIGN MATTER) |
(a) Remove the front speed sensor rotor RH (front axle hub sub-assembly RH).
Click here
(b) Check the front speed sensor rotor RH.
OK:
The front speed sensor rotor RH is free of scratches, oil, and foreign matter.
NOTICE:
Click here
HINT:
|
Result | Proceed to |
|---|---|
|
OK | A |
|
NG (The front speed sensor rotor RH is damaged.) |
B |
| NG (There is foreign matter on the front speed sensor rotor RH.) |
C |
| A |
| REPLACE FRONT SPEED SENSOR RH |
| B |
| REPLACE FRONT AXLE HUB SUB-ASSEMBLY RH |
| C |
| CLEAN FRONT SPEED SENSOR ROTOR RH |
| 10. |
CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - FRONT SPEED SENSOR RH) |
(a) Turn the engine switch off.
(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(c) Disconnect the A28 skid control ECU (brake actuator assembly) connector.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A28-26 (FR-) - A59-2 (FR-) |
Always | Below 1 Ω |
|
A28-26 (FR-) or A59-2 (FR-) - Body ground |
Always | 10 kΩ or higher |
| OK | | REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 11. |
CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - FRONT SPEED SENSOR RH) |
(a) Turn the engine switch off.
(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(c) Disconnect the A28 skid control ECU (brake actuator assembly) connector.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A28-21 (FR+) - A59-1 (FR+) |
Always | Below 1 Ω |
|
A28-21 (FR+) or A59-1 (FR+) - Body ground |
Always | 10 kΩ or higher |
| OK | | REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 12. |
INSPECT BRAKE ACTUATOR ASSEMBLY (POWER SOURCE CIRCUIT) |
| (a) Make sure that there is no looseness at the locking part and the connecting part of the connectors. OK: The connector is securely connected. |
|
(b) Disconnect the z16 front speed sensor RH connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Turn the engine switch on (IG).
(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
z16-1 (FR+) - Body ground |
Engine switch on (IG) |
11 to 14 V |
| NG | | GO TO STEP 17 |
|
| 13. |
INSPECT BRAKE ACTUATOR ASSEMBLY (GROUND CIRCUIT) |
| (a) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
| NG | | GO TO STEP 15 |
|
| 14. |
CHECK FRONT SPEED SENSOR ROTOR RH (CHECK FOR FOREIGN MATTER) |
(a) Remove the front speed sensor rotor RH (front axle hub sub-assembly RH).
Click here
(b) Check the front speed sensor rotor RH.
OK:
The front speed sensor rotor RH is free of scratches, oil, and foreign matter.
NOTICE:
Click here
HINT:
|
Result | Proceed to |
|---|---|
|
OK | A |
|
NG (The front speed sensor rotor RH is damaged.) |
B |
| NG (There is foreign matter on the front speed sensor rotor RH.) |
C |
| A |
| REPLACE FRONT SPEED SENSOR RH |
| B |
| REPLACE FRONT AXLE HUB SUB-ASSEMBLY RH |
| C |
| CLEAN FRONT SPEED SENSOR ROTOR RH |
| 15. |
INSPECT FRONT SKID CONTROL SENSOR WIRE RH |
| (a) Turn the engine switch off. |
|
(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(c) Disconnect the A58 and z16 front skid control sensor wire RH connectors.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
z16-2 (FR-) - A58-5 (FR-) |
Always | Below 1 Ω |
|
z16-2 (FR-) or A58-5 (FR-) - Body ground and other terminals |
Always | 10 kΩ or higher |
NOTICE:
Check the front speed sensor RH signal after replacement.
Click here
| NG | | REPLACE FRONT SKID CONTROL SENSOR WIRE RH |
|
| 16. |
CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - FRONT SKID CONTROL SENSOR WIRE RH) |
(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(b) Disconnect the A28 skid control ECU (brake actuator assembly) connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A28-26 (FR-) - A58-5 (FR-) |
Always | Below 1 Ω |
|
A28-26 (FR-) or A58-5 (FR-) - Body ground |
Always | 10 kΩ or higher |
| OK | | REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 17. |
INSPECT FRONT SKID CONTROL SENSOR WIRE RH |
| (a) Turn the engine switch off. |
|
(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(c) Disconnect the A58 and z16 front skid control sensor wire RH connectors.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
z16-1 (FR+) - A58-6 (FR+) |
Always | Below 1 Ω |
|
z16-1 (FR+) or A58-6 (FR+) - Body ground and other terminals |
Always | 10 kΩ or higher |
NOTICE:
Check the front speed sensor RH signal after replacement.
Click here
| NG | | REPLACE FRONT SKID CONTROL SENSOR WIRE RH |
|
| 18. |
CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - FRONT SKID CONTROL SENSOR WIRE RH) |
(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(b) Disconnect the A28 skid control ECU (brake actuator assembly) connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A28-21 (FR+) - A58-6 (FR+) |
Always | Below 1 Ω |
|
A28-21 (FR+) or A58-6 (FR+) - Body ground |
Always | 10 kΩ or higher |
| OK | | REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 19. |
CHECK FRONT SPEED SENSOR LH INSTALLATION |
| (a) Turn the engine switch off. |
|
(b) Check the front speed sensor LH installation.
OK:
There is no clearance between the front speed sensor LH and the front steering knuckle LH.
The installation bolt is tightened properly.
Torque
8.5 N*m (87 kgf*cm, 75 in.*lbf)
| NG | | REINSTALL OR REPLACE FRONT SPEED SENSOR LH |
|
| 20. |
CHECK FRONT SPEED SENSOR LH (CHECK FOR FOREIGN MATTER) |
(a) Remove the front speed sensor LH.
Click here
(b) Check the front speed sensor LH tip.
OK:
The front speed sensor LH tip is free of scratches, oil, and foreign matter.
NOTICE:
Click here
| Result |
Proceed to |
|---|---|
| OK (w/o AVS) |
A |
| OK (w/ AVS) |
B |
| NG | C |
| B |
| GO TO STEP 26 |
| C |
| CLEAN OR REPLACE FRONT SPEED SENSOR LH |
|
| 21. |
INSPECT BRAKE ACTUATOR ASSEMBLY (POWER SOURCE CIRCUIT) |
| (a) Make sure that there is no looseness at the locking part and the connecting part of the connectors. OK: The connector is securely connected. |
|
(b) Disconnect the A61 front speed sensor LH connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Turn the engine switch on (IG).
(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A61-1 (FL+) - Body ground |
Engine switch on (IG) |
11 to 14 V |
| NG | | GO TO STEP 25 |
|
| 22. |
INSPECT BRAKE ACTUATOR ASSEMBLY (GROUND CIRCUIT) |
| (a) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
| NG | | GO TO STEP 24 |
|
| 23. |
CHECK FRONT SPEED SENSOR ROTOR LH (CHECK FOR FOREIGN MATTER) |
(a) Remove the front speed sensor rotor LH (front axle hub sub-assembly LH).
Click here
(b) Check the front speed sensor rotor LH.
OK:
The front speed sensor rotor LH is free of scratches, oil, and foreign matter.
NOTICE:
Click here
HINT:
|
Result | Proceed to |
|---|---|
|
OK | A |
|
NG (The front speed sensor rotor LH is damaged.) |
B |
| NG (There is foreign matter on the front speed sensor rotor LH.) |
C |
| A |
| REPLACE FRONT SPEED SENSOR LH |
| B |
| REPLACE FRONT AXLE HUB SUB-ASSEMBLY LH |
| C |
| CLEAN FRONT SPEED SENSOR ROTOR LH |
| 24. |
CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - FRONT SPEED SENSOR LH) |
(a) Turn the engine switch off.
(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(c) Disconnect the A28 skid control ECU (brake actuator assembly) connector.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A28-7 (FL-) - A61-2 (FL-) |
Always | Below 1 Ω |
|
A28-7 (FL-) or A61-2 (FL-) - Body ground |
Always | 10 kΩ or higher |
| OK | | REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 25. |
CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - FRONT SPEED SENSOR LH) |
(a) Turn the engine switch off.
(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(c) Disconnect the A28 skid control ECU (brake actuator assembly) connector.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A28-24 (FL+) - A61-1 (FL+) |
Always | Below 1 Ω |
|
A28-24 (FL+) or A61-1 (FL+) - Body ground |
Always | 10 kΩ or higher |
| OK | | REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 26. |
INSPECT BRAKE ACTUATOR ASSEMBLY (POWER SOURCE CIRCUIT) |
| (a) Make sure that there is no looseness at the locking part and the connecting part of the connectors. OK: The connector is securely connected. |
|
(b) Disconnect the z15 front speed sensor LH connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Turn the engine switch on (IG).
(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
z15-1 (FL+) - Body ground |
Engine switch on (IG) |
11 to 14 V |
| NG | | GO TO STEP 31 |
|
| 27. |
INSPECT BRAKE ACTUATOR ASSEMBLY (GROUND CIRCUIT) |
| (a) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
| NG | | GO TO STEP 29 |
|
| 28. |
CHECK FRONT SPEED SENSOR ROTOR LH (CHECK FOR FOREIGN MATTER) |
(a) Remove the front speed sensor rotor LH (front axle hub sub-assembly LH).
Click here
(b) Check the front speed sensor rotor LH.
OK:
The front speed sensor rotor LH is free of scratches, oil, and foreign matter.
NOTICE:
Click here
HINT:
|
Result | Proceed to |
|---|---|
|
OK | A |
|
NG (The front speed sensor rotor LH is damaged.) |
B |
| NG (There is foreign matter on the front speed sensor rotor LH.) |
C |
| A |
| REPLACE FRONT SPEED SENSOR LH |
| B |
| REPLACE FRONT AXLE HUB SUB-ASSEMBLY LH |
| C |
| CLEAN FRONT SPEED SENSOR ROTOR LH |
| 29. |
INSPECT FRONT SKID CONTROL SENSOR WIRE LH |
| (a) Turn the engine switch off. |
|
(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(c) Disconnect the A60 and z15 front skid control sensor wire LH connectors.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
z15-2 (FL-) - A60-5 (FL-) |
Always | Below 1 Ω |
|
z15-2 (FL-) or A60-5 (FL-) - Body ground and other terminals |
Always | 10 kΩ or higher |
NOTICE:
Check the front speed sensor LH signal after replacement.
Click here
| NG | | REPLACE FRONT SKID CONTROL SENSOR WIRE LH |
|
| 30. |
CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - FRONT SKID CONTROL SENSOR WIRE LH) |
(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(b) Disconnect the A28 skid control ECU (brake actuator assembly) connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A28-7 (FL-) - A60-5 (FL-) |
Always | Below 1 Ω |
|
A28-7 (FL-) or A60-5 (FL-) - Body ground |
Always | 10 kΩ or higher |
| OK | | REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 31. |
INSPECT FRONT SKID CONTROL SENSOR WIRE LH |
| (a) Turn the engine switch off. |
|
(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(c) Disconnect the A60 and z15 front skid control sensor wire LH connectors.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
z15-1 (FL+) - A60-6 (FL+) |
Always | Below 1 Ω |
|
z15-1 (FL+) or A60-6 (FL+) - Body ground and other terminals |
Always | 10 kΩ or higher |
NOTICE:
Check the front speed sensor LH signal after replacement.
Click here
| NG | | REPLACE FRONT SKID CONTROL SENSOR WIRE LH |
|
| 32. |
CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - FRONT SKID CONTROL SENSOR WIRE LH) |
(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(b) Disconnect the A28 skid control ECU (brake actuator assembly) connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A28-24 (FL+) - A60-6 (FL+) |
Always | Below 1 Ω |
|
A28-24 (FL+) or A60-6 (FL+) - Body ground |
Always | 10 kΩ or higher |
| OK | | REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 33. |
CHECK REAR SPEED SENSOR RH INSTALLATION |
| (a) Turn the engine switch off. |
|
(b) Check the rear speed sensor RH installation.
OK:
There is no clearance between the rear speed sensor RH and the rear axle hub RH.
HINT:
Because the rear axle hub and bearing assembly RH cannot be disassembled, if the rear speed sensor RH needs replacement, replace the rear axle hub and bearing assembly RH.
| NG | |
REPLACE REAR AXLE HUB AND BEARING ASSEMBLY RH |
|
| 34. |
INSPECT BRAKE ACTUATOR ASSEMBLY (POWER SOURCE CIRCUIT) |
| (a) Make sure that there is no looseness at the locking part and the connecting part of the connectors. OK: The connector is securely connected. |
|
(b) Disconnect the Y5 rear speed sensor RH (rear axle hub and bearing assembly) connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Turn the engine switch on (IG).
(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
Y5-2 (RA+) - Body ground |
Engine switch on (IG) |
11 to 14 V |
| Result |
Proceed to |
|---|---|
| OK |
A |
| NG (w/o AVS) |
B |
| NG (w/ AVS) |
C |
| B |
| GO TO STEP 40 |
| C |
| GO TO STEP 42 |
|
| 35. |
INSPECT BRAKE ACTUATOR ASSEMBLY (GROUND CIRCUIT) |
| (a) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
| Result |
Proceed to |
|---|---|
| OK |
A |
| NG (w/o AVS) |
B |
| NG (w/ AVS) |
C |
| A |
| REPLACE REAR AXLE HUB AND BEARING ASSEMBLY RH |
| C |
| GO TO STEP 38 |
|
| 36. |
INSPECT NO. 1 PARKING BRAKE WIRE ASSEMBLY |
| (a) Turn the engine switch off. |
|
(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(c) Disconnect the Y5 and YK5 skid control sensor wire RH (No. 1 parking brake wire assembly) connectors.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
Y5-1 (RA-) - YK5-2 (RR-) |
Always | Below 1 Ω |
|
Y5-1 (RA-) or YK5-2 (RR-) - Body ground and other terminals |
Always | 10 kΩ or higher |
NOTICE:
Check the rear speed sensor RH signal after replacement.
Click here
| NG | | REPLACE NO. 1 PARKING BRAKE WIRE ASSEMBLY |
|
| 37. |
CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - NO. 1 PARKING BRAKE WIRE ASSEMBLY) |
(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK:
The connector is securely connected.
(b) Disconnect the A28 skid control ECU (brake actuator assembly) connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A28-37 (RR-) - YK5-2 (RR-) |
Always | Below 1 Ω |
|
A28-37 (RR-) or YK5-2 (RR-) - Body ground |
Always | 10 kΩ or higher |
| OK | | REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 38. |
INSPECT NO. 1 PARKING BRAKE WIRE ASSEMBLY |
| (a) Turn the engine switch off. |
|
(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(c) Disconnect the Y5 and YK3 skid control sensor wire RH (No. 1 parking brake wire assembly) connectors.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
Y5-1 (RA-) - YK3-2 (RR-) |
Always | Below 1 Ω |
|
Y5-1 (RA-) or YK3-2 (RR-) - Body ground and other terminals |
Always | 10 kΩ or higher |
NOTICE:
Check the rear speed sensor RH signal after replacement.
Click here
| NG | | REPLACE NO. 1 PARKING BRAKE WIRE ASSEMBLY |
|
| 39. |
CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - NO. 1 PARKING BRAKE WIRE ASSEMBLY) |
(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK:
The connector is securely connected.
(b) Disconnect the A28 skid control ECU (brake actuator assembly) connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A28-37 (RR-) - YK3-2 (RR-) |
Always | Below 1 Ω |
|
A28-37 (RR-) or YK3-2 (RR-) - Body ground |
Always | 10 kΩ or higher |
| OK | | REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 40. |
INSPECT NO. 1 PARKING BRAKE WIRE ASSEMBLY |
| (a) Turn the engine switch off. |
|
(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(c) Disconnect the Y5 and YK5 skid control sensor wire RH (No. 1 parking brake wire assembly) connectors.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
Y5-2 (RA+) - YK5-1 (RR+) |
Always | Below 1 Ω |
|
Y5-2 (RA+) or YK5-1 (RR+) - Body ground and other terminals |
Always | 10 kΩ or higher |
NOTICE:
Check the rear speed sensor RH signal after replacement.
Click here
| NG | | REPLACE NO. 1 PARKING BRAKE WIRE ASSEMBLY |
|
| 41. |
CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - NO. 1 PARKING BRAKE WIRE ASSEMBLY) |
(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK:
The connector is securely connected.
(b) Disconnect the A28 skid control ECU (brake actuator assembly) connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A28-22 (RR+) - YK5-1 (RR+) |
Always | Below 1 Ω |
|
A28-22 (RR+) or YK5-1 (RR+) - Body ground |
Always | 10 kΩ or higher |
| OK | | REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 42. |
INSPECT NO. 1 PARKING BRAKE WIRE ASSEMBLY |
| (a) Turn the engine switch off. |
|
(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(c) Disconnect the Y5 and YK3 skid control sensor wire RH (No. 1 parking brake wire assembly) connectors.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
Y5-2 (RA+) - YK3-1 (RR+) |
Always | Below 1 Ω |
|
Y5-2 (RA+) or YK3-1 (RR+) - Body ground and other terminals |
Always | 10 kΩ or higher |
NOTICE:
Check the rear speed sensor RH signal after replacement.
Click here
| NG | | REPLACE NO. 1 PARKING BRAKE WIRE ASSEMBLY |
|
| 43. |
CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - NO. 1 PARKING BRAKE WIRE ASSEMBLY) |
(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK:
The connector is securely connected.
(b) Disconnect the A28 skid control ECU (brake actuator assembly) connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A28-22 (RR+) - YK3-1 (RR+) |
Always | Below 1 Ω |
|
A28-22 (RR+) or YK3-1 (RR+) - Body ground |
Always | 10 kΩ or higher |
| OK | | REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 44. |
CHECK REAR SPEED SENSOR LH INSTALLATION |
| (a) Turn the engine switch off. |
|
(b) Check the rear speed sensor LH installation.
OK:
There is no clearance between the rear speed sensor LH and the rear axle hub LH.
HINT:
Because the rear axle hub and bearing assembly LH cannot be disassembled, if the rear speed sensor LH needs replacement, replace the rear axle hub and bearing assembly LH.
| NG | |
REPLACE REAR AXLE HUB AND BEARING ASSEMBLY LH |
|
| 45. |
INSPECT BRAKE ACTUATOR ASSEMBLY (POWER SOURCE CIRCUIT) |
| (a) Make sure that there is no looseness at the locking part and the connecting part of the connectors. OK: The connector is securely connected. |
|
(b) Disconnect the Y2 rear speed sensor LH (rear axle hub and bearing assembly) connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Turn the engine switch on (IG).
(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
Y2-2 (LA+) - Body ground |
Engine switch on (IG) |
11 to 14 V |
| Result |
Proceed to |
|---|---|
| OK |
A |
| NG (w/o AVS) |
B |
| NG (w/ AVS) |
C |
| B |
| GO TO STEP 51 |
| C |
| GO TO STEP 53 |
|
| 46. |
INSPECT BRAKE ACTUATOR ASSEMBLY (GROUND CIRCUIT) |
| (a) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
| Result |
Proceed to |
|---|---|
| OK |
A |
| NG (w/o AVS) |
B |
| NG (w/ AVS) |
C |
| A |
| REPLACE REAR AXLE HUB AND BEARING ASSEMBLY LH |
| C |
| GO TO STEP 49 |
|
| 47. |
INSPECT NO. 2 PARKING BRAKE WIRE ASSEMBLY |
| (a) Turn the engine switch off. |
|
(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(c) Disconnect the Y2 and YK6 skid control sensor wire LH (No. 2 parking brake wire assembly) connectors.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
Y2-1 (LA-) - YK6-2 (RL-) |
Always | Below 1 Ω |
|
Y2-1 (LA-) or YK6-2 (RL-) - Body ground and other terminals |
Always | 10 kΩ or higher |
NOTICE:
Check the rear speed sensor LH signal after replacement.
Click here
| NG | | REPLACE NO. 2 PARKING BRAKE WIRE ASSEMBLY |
|
| 48. |
CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - NO. 2 PARKING BRAKE WIRE ASSEMBLY) |
(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK:
The connector is securely connected.
(b) Disconnect the A28 skid control ECU (brake actuator assembly) connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A28-23 (RL-) - YK6-2 (RL-) |
Always | Below 1 Ω |
|
A28-23 (RL-) or YK6-2 (RL-) - Body ground |
Always | 10 kΩ or higher |
| OK | | REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 49. |
INSPECT NO. 2 PARKING BRAKE WIRE ASSEMBLY |
| (a) Turn the engine switch off. |
|
(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(c) Disconnect the Y2 and YK4 skid control sensor wire LH (No. 2 parking brake wire assembly) connectors.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
Y2-1 (LA-) - YK4-2 (RL-) |
Always | Below 1 Ω |
|
Y2-1 (LA-) or YK4-2 (RL-) - Body ground and other terminals |
Always | 10 kΩ or higher |
NOTICE:
Check the rear speed sensor LH signal after replacement.
Click here
| NG | | REPLACE NO. 2 PARKING BRAKE WIRE ASSEMBLY |
|
| 50. |
CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - NO. 2 PARKING BRAKE WIRE ASSEMBLY) |
(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK:
The connector is securely connected.
(b) Disconnect the A28 skid control ECU (brake actuator assembly) connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A28-23 (RL-) - YK4-2 (RL-) |
Always | Below 1 Ω |
|
A28-23 (RL-) or YK4-2 (RL-) - Body ground |
Always | 10 kΩ or higher |
| OK | | REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 51. |
INSPECT NO. 2 PARKING BRAKE WIRE ASSEMBLY |
| (a) Turn the engine switch off. |
|
(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(c) Disconnect the Y2 and YK6 skid control sensor wire LH (No. 2 parking brake wire assembly) connectors.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
Y2-2 (LA+) - YK6-1 (RL+) |
Always | Below 1 Ω |
|
Y2-2 (LA+) or YK6-1 (RL+) - Body ground and other terminals |
Always | 10 kΩ or higher |
NOTICE:
Check the rear speed sensor LH signal after replacement.
Click here
| NG | | REPLACE NO. 2 PARKING BRAKE WIRE ASSEMBLY |
|
| 52. |
CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - NO. 2 PARKING BRAKE WIRE ASSEMBLY) |
(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK:
The connector is securely connected.
(b) Disconnect the A28 skid control ECU (brake actuator assembly) connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A28-39 (RL+) - YK6-1 (RL+) |
Always | Below 1 Ω |
|
A28-39 (RL+) or YK6-1 (RL+) - Body ground |
Always | 10 kΩ or higher |
| OK | | REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 53. |
INSPECT NO. 2 PARKING BRAKE WIRE ASSEMBLY |
| (a) Turn the engine switch off. |
|
(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(c) Disconnect the Y2 and YK4 skid control sensor wire LH (No. 2 parking brake wire assembly) connectors.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
Y2-2 (LA+) - YK4-1 (RL+) |
Always | Below 1 Ω |
|
Y2-2 (LA+) or YK4-1 (RL+) - Body ground and other terminals |
Always | 10 kΩ or higher |
NOTICE:
Check the rear speed sensor LH signal after replacement.
Click here
| NG | | REPLACE NO. 2 PARKING BRAKE WIRE ASSEMBLY |
|
| 54. |
CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - NO. 2 PARKING BRAKE WIRE ASSEMBLY) |
(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK:
The connector is securely connected.
(b) Disconnect the A28 skid control ECU (brake actuator assembly) connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A28-39 (RL+) - YK4-1 (RL+) |
Always | Below 1 Ω |
|
A28-39 (RL+) or YK4-1 (RL+) - Body ground |
Always | 10 kΩ or higher |
| OK | | REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Seat Belt: Seat Belt Warning System(for Gasoline Model)
Customize Parameters CUSTOMIZE PARAMETERS CUSTOMIZE SEAT BELT WARNING SYSTEM NOTICE: When the customer requests a change in a function, first make sure that the function can be customized. Be sure to make a note of the current settings before customizing. When troubleshooting a function, first make ...
