Toyota Avalon (XX50): Open or Short in Rear Speed Sensor RH Circuit (C1407,C1408)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System(for Hv Model) / Open or Short in Rear Speed Sensor RH Circuit (C1407,C1408)

DESCRIPTION

Refer to DTCs C1415 and C1416.

Click here

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	MIL	Note
C1407	Open or Short in Rear Speed Sensor RH Circuit	523 526 528	INF Code: 523 An open in the speed sensor signal circuit continues for 0.5 seconds or more. INF Code: 526 The speed sensor power source voltage is low for 0.5 seconds or more. INF Code: 528 The speed sensor power source voltage is low for 0.2 seconds, and does not return to normal for 60 seconds or more.	Skid control sensor wire RH (No. 1 parking brake wire assembly) Rear speed sensor RH (rear axle hub and bearing assembly RH) Wire harness or connector Skid control ECU (brake booster with master cylinder assembly)	Comes on	INF Code 523: SAE Code C0514 and C0515 INF Code 526: SAE Code C14EA (Case 1) INF Code 528: SAE Code C14EA (Case 2) ABS DTC
C1408	Open or Short in Rear Speed Sensor LH Circuit	533 536 538	INF Code: 533 An open in the speed sensor signal circuit continues for 0.5 seconds or more. INF Code: 536 The speed sensor power source voltage is low for 0.5 seconds or more. INF Code: 538 The speed sensor power source voltage is low for 0.2 seconds, and does not return to normal for 60 seconds or more.	Skid control sensor wire LH (No. 2 parking brake wire assembly) Rear speed sensor LH (rear axle hub and bearing assembly LH) Wire harness or connector Skid control ECU (brake booster with master cylinder assembly)	Comes on	INF Code 533: SAE Code C050E and C050F INF Code 536: SAE Code C14E7 (Case 1) INF Code 538: SAE Code C14E7 (Case 2) ABS DTC

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

MIL

Note

C1407

Open or Short in Rear Speed Sensor RH Circuit

523

526

528

INF Code: 523
- An open in the speed sensor signal circuit continues for 0.5 seconds or more.
INF Code: 526
- The speed sensor power source voltage is low for 0.5 seconds or more.
INF Code: 528
- The speed sensor power source voltage is low for 0.2 seconds, and does not return to normal for 60 seconds or more.

Skid control sensor wire RH (No. 1 parking brake wire assembly)
Rear speed sensor RH (rear axle hub and bearing assembly RH)
Wire harness or connector
Skid control ECU (brake booster with master cylinder assembly)

Comes on

INF Code 523: SAE Code C0514 and C0515
INF Code 526: SAE Code C14EA (Case 1)
INF Code 528: SAE Code C14EA (Case 2)
ABS DTC

C1408

Open or Short in Rear Speed Sensor LH Circuit

533

536

538

INF Code: 533
- An open in the speed sensor signal circuit continues for 0.5 seconds or more.
INF Code: 536
- The speed sensor power source voltage is low for 0.5 seconds or more.
INF Code: 538
- The speed sensor power source voltage is low for 0.2 seconds, and does not return to normal for 60 seconds or more.

Skid control sensor wire LH (No. 2 parking brake wire assembly)
Rear speed sensor LH (rear axle hub and bearing assembly LH)
Wire harness or connector
Skid control ECU (brake booster with master cylinder assembly)

Comes on

INF Code 533: SAE Code C050E and C050F
INF Code 536: SAE Code C14E7 (Case 1)
INF Code 538: SAE Code C14E7 (Case 2)
ABS DTC

MONITOR DESCRIPTION

The skid control ECU (brake booster with master cylinder assembly) monitors the output voltage and power supply voltage of the speed sensors. If the output voltage of the speed sensor is outside the normal range, or if the voltage at VM1 of the skid control ECU (brake booster with master cylinder assembly) is normal and the power supply voltage of the speed sensor drops below a specific value, the skid control ECU (brake booster with master cylinder assembly) judges that the circuit of the speed sensor is malfunctioning and illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs	C050E: Speed sensor circuit low C050F: Speed sensor circuit high C0514: Speed sensor circuit low C0515: Speed sensor circuit high C14E7 (Case 1): Speed sensor voltage circuit low C14E7 (Case 2): Speed sensor voltage circuit low C14EA (Case 1): Speed sensor voltage circuit low C14EA (Case 2): Speed sensor voltage circuit low
Required Sensors/Components(Main)	Speed sensor Skid control ECU (brake booster with master cylinder assembly)
Required Sensors/Components(Related)	Speed sensor Skid control ECU (brake booster with master cylinder assembly)
Frequency of Operation	Continuous
Duration	0.5 seconds: C050E, C050F, C0514, C0515, C14E7 (Case 1) and C14EA (Case 1) 60 seconds: C14E7 (Case 2) and C14EA (Case 2)
MIL Operation	Immediately
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

C050E, C050F, C0514 and C0515

Monitor runs whenever the following DTCs are not stored	C14E1, C14E4, C14E7, C14EA(Case 1) (Speed sensor voltage circuit low) C14E1, C14E4, C14E7, C14EA(Case 2) (Speed sensor voltage circuit low)
All of the following conditions are met	-
Brake system voltage 1 (VM1)	Higher than 7.54 V
Serial communication with low side IC	Valid
Command to speed sensor power supply	On
Speed sensor fail (C14E1, C14E4, C14E7, C14EA)	Not detected

C14E7 and C14EA (Case 1)

Monitor runs whenever the following DTCs are not stored	C0502, C0508, C050E, C0514 (Speed sensor circuit low) C0503, C0509, C050F, C0515 (Speed sensor circuit high) C14E1, C14E4, C14E7, C14EA (Case 2) (Speed sensor voltage circuit low)
All of the following conditions are met	-
Brake system voltage 1 (VM1)	Higher than 7.54 V
Serial communication with low side IC	Valid
Command to speed sensor power supply	On
Speed sensor fail (C0502, C0503, C0508, C0509, C050E, C050F, C0514, C0515, C14E1 (Case 2), C14E4 (Case 2), C14E7 (Case 2), C14EA (Case 2))	Not detected

C14E7 and C14EA (Case 2)

Monitor runs whenever the following DTCs are not stored	C0502, C0508, C050E, C0514 (Speed sensor circuit low) C0503, C0509, C050F, C0515 (Speed sensor circuit high) C14E1, C14E4, C14E7, C14EA (Case 1) (Speed sensor voltage circuit low)
All of the following conditions are met	-
Brake system voltage 1 (VM1)	Higher than 7.54 V
Serial communication with low side IC	Valid
Command to speed sensor power supply	On
Speed sensor fail (C0502, C0503, C0508, C0509, C050E, C050F, C0514, C0515, C14E1 (Case 1), C14E4 (Case 1), C14E7 (Case 1), C14EA (Case 1))	Not detected

TYPICAL MALFUNCTION THRESHOLDS

C050E and C0514

Speed sensor voltage

Less than 0.4 V

C050F and C0515

Speed sensor voltage

Higher than 3.3 V

C14E7 and C14EA (Case 1)

Speed sensor power supply voltage

Less than 6.1 V

C14E7 and C14EA (Case 2)

The speed sensor power supply voltage drops below 6.1 V for 0.2 seconds or more

Met

COMPONENT OPERATING RANGE

C050E, C050F, C0514 and C0515

Both of the following conditions are met	-
Serial communication with low side IC	Valid
Speed sensor voltage	0.4 V or more, and 3.3 V or less

C14E7 and C14EA (Case 1)

Both of the following conditions are met	-
Serial communication with low side IC	Valid
Speed sensor power supply voltage	6.1 V or more

C14E7 and C14EA (Case 2)

All of the following conditions are met	-
Brake system voltage 1 (VM1)	Higher than 7.54 V
Serial communication with low side IC	Valid
Command to speed sensor power supply	On
Speed sensor fail (C0502, C0503, C0508, C0509, C050E, C050F, C0514, C0515, C14E1 (Case 1), C14E4 (Case 1), C14E7 (Case 1), C14EA (Case 1))	Not detected
The speed sensor power supply voltage drops below 6.1 V for 0.2 seconds or more	Not met

CONFIRMATION DRIVING PATTERN

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off.
Turn the power switch on (IG).
Turn the Techstream on.
Wait 60 seconds.
Enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Codes.
Read the DTCs.
HINT:
- If a DTC is output, the system is malfunctioning.
- If a DTC is not output, perform the following procedure.
If the DTCs are not output, perform a universal trip and check for permanent DTCs.
Click here

HINT:
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTCs are output, the system is normal.

WIRING DIAGRAM

Refer to DTCs C1415 and C1416.

Click here

CAUTION / NOTICE / HINT

NOTICE:

After replacing the skid control ECU (brake booster with master cylinder assembly), perform linear solenoid valve offset learning, ABS holding solenoid valve learning, yaw rate and acceleration sensor zero point calibration and system information memorization after performing "Reset Memory".
Click here
Disassembly of the rear speed sensor from the rear axle hub and bearing assembly is prohibited.

PROCEDURE

CHECK DTC

(a) Clear the DTCs.

Click here

Chassis > ABS/VSC/TRAC > Clear DTCs

(b) Turn the power switch off.

(d) Check if the same DTC is output.

Click here

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
DTC C1407 is output.	A
DTC C1408 is output.	B

GO TO STEP 8

2.	READ VALUE USING TECHSTREAM (MOMENTARY INTERRUPTION)

(a) Using the Techstream, check for any momentary interruptions in the wire harness and connector corresponding to a DTC.

Click here

Chassis > ABS/VSC/TRAC > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
RR Speed Open	Rear speed sensor RH open detection	Error or Normal	Error: Momentary interruption Normal: Normal	-

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

RR Speed Open

Rear speed sensor RH open detection

Error or Normal

Error: Momentary interruption

Normal: Normal

Chassis > ABS/VSC/TRAC > Data List

Tester Display
RR Speed Open

(b) Check for any momentary interruptions in the wire harness and connectors.

OK:

There are no momentary interruptions.

NOTICE:

Perform the above inspection before removing the sensor and connector.

GO TO STEP 5

3.	READ VALUE USING TECHSTREAM (REAR SPEED SENSOR RH)

(a) Select the Data List on the Techstream.

Click here

Chassis > ABS/VSC/TRAC > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
RR Wheel Speed	Rear speed sensor RH	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

Chassis > ABS/VSC/TRAC > Data List

Tester Display
RR Wheel Speed

(b) Check the rear speed sensor RH output value.

OK:

The output value changes in accordance with the vehicle speed.

GO TO STEP 5

4.	RECONFIRM DTC

(a) Clear the DTCs.

Click here

Chassis > ABS/VSC/TRAC > Clear DTCs

(b) Turn the power switch off.

(d) Perform a road test.

(e) Check if the same DTC is output.

Click here

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
DTC C1407 is not output.	A
DTC C1407 is output.	B

USE SIMULATION METHOD TO CHECK

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

5.	INSPECT NO. 1 PARKING BRAKE WIRE ASSEMBLY

(a) Turn the power switch off.

Front view of skid control sensor wire RH (No. 1 parking brake wire assembly)

Front view of wire harness connector

(to Sensor Side Connector)

Front view of wire harness connector

(to Vehicle Side Connector)

(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.

(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
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

REPLACE NO. 1 PARKING BRAKE WIRE ASSEMBLY

6.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER 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 A35 skid control ECU (brake booster with master cylinder assembly) connector.

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
A35-7 (RR+) - YK5-1 (RR+)	Always	Below 1 Ω
A35-7 (RR+) or YK5-1 (RR+) - Body ground	Always	10 kΩ or higher
A35-8 (RR-) - YK5-2 (RR-)	Always	Below 1 Ω
A35-8 (RR-) or YK5-2 (RR-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	INSPECT BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SENSOR OUTPUT)

(a) Reconnect the A35 skid control ECU (brake booster with master cylinder assembly) connector.

*a	Front view of wire harness connector (to Skid Control Sensor Wire RH (No. 1 Parking Brake Wire Assembly))

(b) Turn the power switch on (IG).

Standard Voltage:

Tester Connection	Condition	Specified Condition
YK5-1 (RR+) - Body ground	Power switch on (IG)	8 to 14 V

NOTICE:

Check the rear speed sensor RH signal after replacement.

Click here

HINT:

The rear speed sensor RH and rear speed sensor rotor RH are incorporated into the rear axle hub and bearing assembly RH.

If the rear speed sensor RH and rear speed sensor rotor RH need to be replaced, replace the rear axle hub and bearing assembly RH.

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY RH

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

8.	READ VALUE USING TECHSTREAM (MOMENTARY INTERRUPTION)

(a) Using the Techstream, check for any momentary interruptions in the wire harness and connector corresponding to a DTC.

Click here

Chassis > ABS/VSC/TRAC > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

RL Speed Open

Rear speed sensor LH open detection

Error or Normal

Error: Momentary interruption

Normal: Normal

Chassis > ABS/VSC/TRAC > Data List

Tester Display
RL Speed Open

(b) Check for any momentary interruptions in the wire harness and connectors.

OK:

There are no momentary interruptions.

NOTICE:

Perform the above inspection before removing the sensor and connector.

GO TO STEP 11

9.	READ VALUE USING TECHSTREAM (REAR SPEED SENSOR LH)

(a) Select the Data List on the Techstream.

Click here

Chassis > ABS/VSC/TRAC > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
RL Wheel Speed	Rear speed sensor LH	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

Chassis > ABS/VSC/TRAC > Data List

Tester Display
RL Wheel Speed

(b) Check the rear speed sensor LH output value.

OK:

The output value changes in accordance with the vehicle speed.

GO TO STEP 11

10.	RECONFIRM DTC

(a) Clear the DTCs.

Click here

Chassis > ABS/VSC/TRAC > Clear DTCs

(b) Turn the power switch off.

(d) Perform a road test.

(e) Check if the same DTC is output.

Click here

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
DTC C1408 is not output.	A
DTC C1408 is output.	B

USE SIMULATION METHOD TO CHECK

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

11.	INSPECT NO. 2 PARKING BRAKE WIRE ASSEMBLY

(a) Turn the power switch off.

Front view of skid control sensor wire LH (No. 2 parking brake wire assembly)

Front view of wire harness connector

(to Sensor Side Connector)

Front view of wire harness connector

(to Vehicle Side Connector)

(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.

(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
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

REPLACE NO. 2 PARKING BRAKE WIRE ASSEMBLY

12.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER 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 A35 skid control ECU (brake booster with master cylinder assembly) connector.

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
A35-34 (RL+) - YK6-1 (RL+)	Always	Below 1 Ω
A35-34 (RL+) or YK6-1 (RL+) - Body ground	Always	10 kΩ or higher
A35-35 (RL-) - YK6-2 (RL-)	Always	Below 1 Ω
A35-35 (RL-) or YK6-2 (RL-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

13.	INSPECT BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SENSOR OUTPUT)

(a) Reconnect the A35 skid control ECU (brake booster with master cylinder assembly) connector.

*a	Front view of wire harness connector (to Skid Control Sensor Wire LH (No. 2 Parking Brake Wire Assembly))

(b) Turn the power switch on (IG).

Standard Voltage:

Tester Connection	Condition	Specified Condition
YK6-1 (RL+) - Body ground	Power switch on (IG)	8 to 14 V

NOTICE:

Check the rear speed sensor LH signal after replacement.

Click here

HINT:

The rear speed sensor LH and rear speed sensor rotor LH are incorporated into the rear axle hub and bearing assembly LH.

If the rear speed sensor LH and rear speed sensor rotor LH need to be replaced, replace the rear axle hub and bearing assembly LH.

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY LH

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

Open or Short in Front Speed Sensor RH Circuit (C1405,C1406)

Front Speed Sensor RH Circuit Output (C1413,C1414)

See More:

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Electronically Controlled Brake System(for Gasoline Model): Motor Circuit (C1428). Steering Angle Sensor Power Source Voltage (C1432). Steering Angle Sensor Internal Circuit (C1433)
Motor Circuit (C1428) DESCRIPTION This DTC is stored when the skid control ECU (brake actuator assembly) judges that an abnormality occurred in the circuit used to operate the pump motor. DTC No. Detection Item DTC Detection Condition Trouble Area C1428 Motor Circuit A malfunction occurs in the pump ...