Toyota Avalon (XX50): Deceleration Sensor (C1232,C1243,C1245). Yaw Rate Sensor discrimination (C1240). Low or High Power Supply Voltage (C1241)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System(for Hv Model) / Deceleration Sensor (C1232,C1243,C1245). Yaw Rate Sensor discrimination (C1240). Low or High Power Supply Voltage (C1241)

Deceleration Sensor (C1232,C1243,C1245)

DESCRIPTION

The airbag ECU assembly has a built-in yaw rate and acceleration sensor and detects the vehicle condition using 2 circuits (GL1, GL2).

The skid control ECU (brake booster with master cylinder assembly) receives signals from the yaw rate and acceleration sensor (airbag ECU assembly) via the CAN communication system.

HINT:

When a malfunction occurs in the communication line to the yaw rate and acceleration sensor (airbag ECU assembly), U0124 (Lost Communication With Lateral Acceleration Sensor Module) is output.

If a DTC related to the CAN communication line is output, first troubleshoot the CAN communication line.

A DTC may be stored if either of the following is detected:

Incorrect installation of acceleration sensor (airbag ECU assembly).
Abnormal acceleration sensor (airbag ECU assembly) signal.

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	MIL	Note
C1232	Deceleration Sensor	562 563	When the vehicle speed is 10 km/h (6 mph) or more, the acceleration sensor output value does not change for 30 seconds or more.	Acceleration sensor (airbag ECU assembly) installed improperly Acceleration sensor (airbag ECU assembly)	Comes on	INF Code 562: SAE Code C051C (Case 3) INF Code 563: SAE Code C051C (Case 4) ABS DTC
C1243	Deceleration Sensor Stuck	561 564 565	INF Code: 561 The acceleration sensor output value does not change 16 times or more before the vehicle speed reaches 0 km/h (0 mph) from 30 km/h (19 mph). INF Code: 564 The longitudinal and lateral output values of the acceleration sensor are not within the specified range for 60 seconds or more. INF Code: 565 The lateral output value of the acceleration sensor is not within the specified range for 60 seconds or more.	Acceleration sensor (airbag ECU assembly) installed improperly Acceleration sensor (airbag ECU assembly)	Comes on	INF Code 561: SAE Code C051C (Case 1) INF Code 564: SAE Code C0520 (Case 2) INF Code 565: SAE Code C0520 (Case 1) ABS DTC
C1245	Abnormal Output in Deceleration Sensor	581	When the vehicle speed is 30 km/h (19 mph) or more, the difference between the deceleration value from the acceleration sensor and deceleration value calculated from the change in vehicle speed exceeds 0.35 G for 60 seconds or more.	Acceleration sensor (airbag ECU assembly) installed improperly Acceleration sensor (airbag ECU assembly)	Comes on	INF Code 581: SAE Code C051C (Case 2) ABS DTC

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

MIL

Note

C1232

Deceleration Sensor

562

563

When the vehicle speed is 10 km/h (6 mph) or more, the acceleration sensor output value does not change for 30 seconds or more.

Acceleration sensor (airbag ECU assembly) installed improperly
Acceleration sensor (airbag ECU assembly)

Comes on

INF Code 562: SAE Code C051C (Case 3)
INF Code 563: SAE Code C051C (Case 4)
ABS DTC

C1243

Deceleration Sensor Stuck

561

564

565

INF Code: 561
- The acceleration sensor output value does not change 16 times or more before the vehicle speed reaches 0 km/h (0 mph) from 30 km/h (19 mph).
INF Code: 564
- The longitudinal and lateral output values of the acceleration sensor are not within the specified range for 60 seconds or more.
INF Code: 565
- The lateral output value of the acceleration sensor is not within the specified range for 60 seconds or more.

Acceleration sensor (airbag ECU assembly) installed improperly
Acceleration sensor (airbag ECU assembly)

Comes on

INF Code 561: SAE Code C051C (Case 1)
INF Code 564: SAE Code C0520 (Case 2)
INF Code 565: SAE Code C0520 (Case 1)
ABS DTC

C1245

Abnormal Output in Deceleration Sensor

581

When the vehicle speed is 30 km/h (19 mph) or more, the difference between the deceleration value from the acceleration sensor and deceleration value calculated from the change in vehicle speed exceeds 0.35 G for 60 seconds or more.

Acceleration sensor (airbag ECU assembly) installed improperly
Acceleration sensor (airbag ECU assembly)

Comes on

INF Code 581: SAE Code C051C (Case 2)
ABS DTC

MONITOR DESCRIPTION

When the vehicle is being driven or is braking and the following conditions are met, the skid control ECU (brake booster with master cylinder assembly) judges that the acceleration sensor (airbag ECU assembly) is stuck or is outputting an abnormal value and illuminates the MIL and stores a DTC.

The output of the longitudinal G sensor does not change substantially a certain number of times.
The difference in the estimated acceleration calculated based on the vehicle speed and the output value from the acceleration sensor is more than a specific value for a certain amount of time.
The output values of the longitudinal G and lateral G sensor is outside the normal expected range.
The longitudinal G and lateral G sensor within the acceleration sensor (airbag ECU assembly) is stuck.

MONITOR STRATEGY

Related DTCs	C051C (Case 1): Acceleration sensor range/performance C051C (Case 2): Acceleration sensor range/performance C051C (Case 3): Acceleration sensor range/performance C051C (Case 4): Acceleration sensor range/performance C0520 (Case 1): Acceleration sensor 2 out of range C0520 (Case 2): Acceleration sensor 1 and acceleration sensor 2 out of range
Required Sensors/Components(Main)	Acceleration sensor (airbag ECU assembly) Speed sensor
Required Sensors/Components(Related)	Skid control ECU (brake booster with master cylinder assembly) Acceleration sensor (airbag ECU assembly) Speed sensor Brake actuator (brake booster with master cylinder assembly)
Frequency of Operation	Continuous
Duration	-: C051C (Case 3 and 4) 16 times: C051C (Case 1) 60 seconds: C051C (Case 2) and C0520 (Case 1 and 2)
MIL Operation	Immediately
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

C051C (Case 1)

Monitor runs whenever the following DTCs are not stored	C051C (Case 2) (Acceleration sensor range/performance) C051E (Acceleration sensor intermittent/erratic) C0520 (Case 3) (Acceleration sensor internal malfunction)
All of the following conditions are met	-
Lost communication with yaw rate and acceleration sensor (airbag ECU assembly)	Not detected
IG1	On
Test Mode	Off
Maintenance mode	Off
Acceleration slip state	Not slip
Acceleration sensor fail (C051C (Case 2), C051E, C0520 (Case 3))	Not detected

C051C (Case 2)

Monitor runs whenever the following DTCs are not stored	C051C (Case 1) (Acceleration sensor range/performance) C051C (Case 3) (Acceleration sensor range/performance) C051C (Case 4) (Acceleration sensor range/performance) C051E (Acceleration sensor intermittent/erratic) C0520 (Case 1) (Acceleration sensor 2 out of range) C0520 (Case 2) (Acceleration sensor 1 and acceleration sensor 2 out of range) C0520 (Case 3) (Acceleration sensor internal malfunction)
All of the following conditions are met	-
Lost communication with yaw rate and acceleration sensor (airbag ECU assembly)	Not detected
Test Mode	Off
Maintenance mode	Off
Control valve solenoid	Non-drive
Acceleration slip state	Not slip
Vehicle speed	Higher than 30 km/h (19 mph)
Acceleration sensor 1 (longitudinal G) invalidation/validation (CAN communication data)	"0" (Valid)
Acceleration sensor fail (C051C (Case 1, 3 and 4), C051E, C0520)	Not detected

C051C (Case 3 and 4)

Monitor runs whenever the following DTCs are not stored	None
Both of the following conditions are met	-
Test Mode	Off
Maintenance mode	Off

C0520 (Case 1 and 2)

Monitor runs whenever the following DTCs are not stored	C051C (Case 2) (Acceleration sensor range/performance) C051E (Acceleration sensor intermittent/erratic) C0520 (Case 3) (Acceleration sensor internal malfunction)
All of the following conditions are met	-
Lost communication with yaw rate and acceleration sensor (airbag ECU assembly)	Not detected
IG1	On
Test Mode	Off
Maintenance mode	Off
Acceleration sensor fail (C051C (Case 2), C051E, C0520 (Case 3))	Not detected

TYPICAL MALFUNCTION THRESHOLDS

C051C (Case 1)

When the vehicle speed is decreasing from more than 30 km/h (19 mph) to 0 km/h (0 mph), change in the output value of the acceleration sensor (longitudinal G)

Less than 0.29 m/s2

C051C (Case 2)

Difference in output value of the acceleration sensor (longitudinal G) and the acceleration calculated based on the vehicle speed

Higher than 3.43 m/s2

C051C (Case 3)

Acceleration sensor (longitudinal G) stuck

C051C (Case 4)

Acceleration sensor (lateral G) stuck

C0520 (Case 1)

Acceleration sensor 2

13.73 m/s2 or more, or -13.73 m/s2 or less

C0520 (Case 2)

Either of the following condition is met	A or B
A. Both of the following conditions are met	-
Acceleration sensor 1	13.73 m/s2 or more
Acceleration sensor 2	13.73 m/s2 or more
B. Both of the following conditions are met	-
Acceleration sensor 1	-13.73 m/s2 or less
Acceleration sensor 2	-13.73 m/s2 or less

COMPONENT OPERATING RANGE

C051C (Case 1) and C0520 (Case 1 and 2)

Both of the following conditions are met	-
Test Mode	Off
Acceleration sensor validation	Valid

C051C (Case 2)

All of the following conditions are met	-
Test Mode	Off
Maintenance mode	Off
Acceleration sensor (longitudinal G) validation	Valid

C051C (Case 3)

All of the following conditions are met	-
Acceleration sensor 1 (longitudinal G) error (CAN communication data)	"0" (no abnormality)
Acceleration sensor 2 (lateral G) error (CAN communication data)	"0" (no abnormality)
Acceleration sensor (longitudinal G) validation	Valid
Acceleration sensor (longitudinal G) output validation flag	On
Acceleration sensor (longitudinal G) stuck	Off

C051C (Case 4)

All of the following conditions are met	-
Acceleration sensor 1 (longitudinal G) error (CAN communication data)	"0" (no abnormality)
Acceleration sensor 2 (lateral G) error (CAN communication data)	"0" (no abnormality)
Acceleration sensor (lateral G) validation	Valid
Acceleration sensor 2 (lateral G)	Higher than -7.85 m/s2, and less than 7.85 m/s2
Acceleration sensor (lateral G) stuck	Off

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 (READY).
Turn the Techstream on.
Drive the vehicle at a speed of more than 30 km/h (19 mph) for 1 minute, and then wait for 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.

CAUTION / NOTICE / HINT

NOTICE:

After replacing or reinstalling the yaw rate and acceleration sensor (airbag ECU assembly), perform yaw rate and acceleration sensor zero point calibration after clearing previously calibrated data.

Click here

HINT:

When U0124 and/or U0126 is output together with C1232, C1243 and/or C1245, inspect and repair the trouble areas indicated by U0124 and/or U0126 first.

Click here

PROCEDURE

1.	CHECK AIRBAG ECU ASSEMBLY INSTALLATION

(a) Check that the yaw rate and acceleration sensor (airbag ECU assembly) has been installed properly.

Click here

OK:

The yaw rate and acceleration sensor (airbag ECU assembly) is tightened to the specified torque.

The yaw rate and acceleration sensor (airbag ECU assembly) is not tilted.

REPLACE AIRBAG ECU ASSEMBLY

INSTALL AIRBAG ECU ASSEMBLY CORRECTLY

Yaw Rate Sensor discrimination (C1240)

DESCRIPTION

The airbag ECU assembly has a built-in yaw rate and acceleration sensor and detects the vehicle condition using 2 circuits (GL1, GL2).

If the identification ID of the yaw rate and acceleration sensor (airbag ECU assembly) is different to that stored in the skid control ECU (brake booster with master cylinder assembly), DTC C1240 is stored.

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	MIL	Note
C1240	Yaw Rate Sensor discrimination	406	The identification ID sent from the yaw rate sensor is different to that stored in the skid control ECU (brake booster with master cylinder assembly) for 1 second or more.	Incorrect yaw rate sensor (airbag ECU assembly) installed Skid control ECU (brake booster with master cylinder assembly)	Comes on	INF Code 406: SAE Code C1240 VSC DTC

MONITOR DESCRIPTION

When an incompatible yaw rate and acceleration sensor (airbag ECU assembly) is installed and the skid control ECU (brake booster with master cylinder assembly) receives a signal differing from the yaw rate and acceleration sensor that should be installed, the skid control ECU (brake booster with master cylinder assembly) judges that the signal is abnormal and illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Related DTCs	C1240: Yaw rate and acceleration sensor incorrect
Required Sensors/Components(Main)	Yaw rate and acceleration sensor (airbag ECU assembly)
Required Sensors/Components(Related)	Skid control ECU (brake booster with master cylinder assembly)
Frequency of Operation	Continuous
Duration	1 second
MIL Operation	Immediately
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored	None
Lost communication with yaw rate and acceleration sensor (airbag ECU assembly)	Not detected

TYPICAL MALFUNCTION THRESHOLDS

Yaw rate and acceleration sensor ID (CAN communication data)

Not "4"

COMPONENT OPERATING RANGE

Yaw rate and acceleration sensor ID (CAN communication data)

"4"

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 1 second.
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.

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
After replacing or reinstalling the yaw rate and acceleration sensor (airbag ECU assembly), perform yaw rate and acceleration sensor zero point calibration after clearing previously calibrated data.
Click here

PROCEDURE

1.	CHECK PART NUMBER (AIRBAG ECU ASSEMBLY)

(a) Check that the proper yaw rate and acceleration sensor (airbag ECU assembly) is installed.

OK:

Proper yaw rate and acceleration sensor (airbag ECU assembly) is installed.

REPLACE AIRBAG ECU ASSEMBLY

2.	RECONFIRM 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 C1240 is output.	A
DTC C1240 is not output.	B

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

USE SIMULATION METHOD TO CHECK

Low or High Power Supply Voltage (C1241)

DESCRIPTION

If a malfunction is detected in the power supply circuit, the skid control ECU (brake booster with master cylinder assembly) power source voltage drops, or there is insufficient voltage to operate the main relay, the skid control ECU (brake booster with master cylinder assembly) will store these DTCs.

If the auxiliary battery voltage is temporarily low, these DTCs may be stored.

HINT:

DTC C1256 (Accumulator Low Pressure) may also be memorized if there is a drop in power source voltage.

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	MIL	Note
C1241	Low or High Power Supply Voltage	101 102 103 551 552 554	INF Code: 101 Either of the following is detected when the BS terminal voltage is 9.1 V or less: The brake is not applied for 3 seconds or more. The brake is applied for 0.05 seconds or more. INF Code: 102 Any of the following is detected when the ECU internal voltage is 6.92 V or less: The relay output voltage is less than 3.5 V for 0.05 seconds or more, when the main relay operation command is on. The stroke sensor value invalid for 0.2 seconds or more. The reaction force pressure sensor value invalid for 0.2 seconds or more. The servo pressure sensor power source voltage is 6.29 V or less, or 7.64 V or more for 0.06 seconds or more. The servo pressure sensor value invalid for 0.2 seconds or more. The reaction force pressure sensor power source voltage is 6.29 V or less, or 7.64 V or more for 0.06 seconds or more. INF Code: 103 When the ECU internal voltage is 8.3 V or less, the accumulator pressure sensor value is invalid for 0.8 seconds or more. Either of the following is detected when the ECU internal voltage is 6.9 V or less: When the accumulator pressure sensor value is 15 MPa (153 kgf/cm2, 2176 psi) or less, the pump motor does not operate for 1 second or more. Both the motor relay 1 and 2 cannot be operated for 0.2 seconds or more. INF Code: 551 Either of the following is detected when the BS voltage of the ABS unit is 9.1 V or less: The brake is not applied for 3 seconds or more. The brake is applied for 0.05 seconds or more. INF Code: 552 The speed sensor power voltage is invalid for 60 seconds or more. INF Code: 554 The voltage of IG1 or IG2 is 9.5 V or less for 10 seconds or more.	Improperly connected connector, deformation or corrosion of terminals Auxiliary battery Hybrid control system (Charging circuit) Skid control ECU (brake booster with master cylinder assembly) Wire harness or connector	Comes on	INF Code 101: SAE Code C14DE INF Code 102: SAE Code C1241 (Case 1 to 7) INF Code 103: SAE Code C1241 (Case 8 to 10) INF Code 551: SAE Code C14DB (Case 1 and 2) INF Code 552: SAE Code C1241 (Case 12) INF Code 554: SAE Code C1241 (Case 11) Electronically controlled brake system DTC

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

MIL

Note

C1241

Low or High Power Supply Voltage

101

102

103

551

552

554

INF Code: 101
- Either of the following is detected when the BS terminal voltage is 9.1 V or less:
  1. The brake is not applied for 3 seconds or more.
  2. The brake is applied for 0.05 seconds or more.
INF Code: 102
- Any of the following is detected when the ECU internal voltage is 6.92 V or less:
  1. The relay output voltage is less than 3.5 V for 0.05 seconds or more, when the main relay operation command is on.
  2. The stroke sensor value invalid for 0.2 seconds or more.
  3. The reaction force pressure sensor value invalid for 0.2 seconds or more.
  4. The servo pressure sensor power source voltage is 6.29 V or less, or 7.64 V or more for 0.06 seconds or more.
  5. The servo pressure sensor value invalid for 0.2 seconds or more.
  6. The reaction force pressure sensor power source voltage is 6.29 V or less, or 7.64 V or more for 0.06 seconds or more.
INF Code: 103
- When the ECU internal voltage is 8.3 V or less, the accumulator pressure sensor value is invalid for 0.8 seconds or more.
- Either of the following is detected when the ECU internal voltage is 6.9 V or less:
  1. When the accumulator pressure sensor value is 15 MPa (153 kgf/cm2, 2176 psi) or less, the pump motor does not operate for 1 second or more.
  2. Both the motor relay 1 and 2 cannot be operated for 0.2 seconds or more.
INF Code: 551
- Either of the following is detected when the BS voltage of the ABS unit is 9.1 V or less:
  1. The brake is not applied for 3 seconds or more.
  2. The brake is applied for 0.05 seconds or more.
INF Code: 552
- The speed sensor power voltage is invalid for 60 seconds or more.
INF Code: 554
- The voltage of IG1 or IG2 is 9.5 V or less for 10 seconds or more.

Improperly connected connector, deformation or corrosion of terminals
Auxiliary battery
Hybrid control system (Charging circuit)
Skid control ECU (brake booster with master cylinder assembly)
Wire harness or connector

Comes on

INF Code 101: SAE Code C14DE
INF Code 102: SAE Code C1241 (Case 1 to 7)
INF Code 103: SAE Code C1241 (Case 8 to 10)
INF Code 551: SAE Code C14DB (Case 1 and 2)
INF Code 552: SAE Code C1241 (Case 12)
INF Code 554: SAE Code C1241 (Case 11)
Electronically controlled brake system DTC

MONITOR DESCRIPTION

When the voltage at VM1, VM2, IG1, IG2 or BS drops due to a malfunction in the auxiliary battery and hybrid control system (charging circuit), the skid control ECU (brake booster with master cylinder assembly) judges that there is a drop in the power supply and illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs	C1241: Brake system voltage circuit low C14DB: ABS solenoid power supply voltage circuit low C14DE: Main relay voltage circuit low
Required Sensors/Components(Main)	Brake pedal stroke sensor assembly Skid control ECU (brake booster with master cylinder assembly) Brake booster pump assembly Brake actuator assembly Brake actuator (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	-: C1241 (Case 6), C1241 (Case 7) and C14DE (Case 1) Within 1 second: C1241 (Case 1), C1241 (Case 2), C1241 (Case 3), C1241 (Case 4), C1241 (Case 5), C1241 (Case 8), C1241 (Case 9), C1241 (Case 10), C14DB (Case 2) and C14DE (Case 3) 3 seconds: C14DB (Case 1) and C14DE (Case 2) 10 seconds: C1241 (Case 11) 60 seconds: C1241 (Case 12)
MIL Operation	Immediately
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

C1241 (Case 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10)

Monitor runs whenever the following DTCs are not stored	None
Vehicle electric power supply	Stable state

C1241 (Case 11)

Monitor runs whenever the following DTCs are not stored	None
Both of the following conditions are met	-
IG1	On
Vehicle speed	Higher than 3 km/h (2 mph)

C1241 (Case 12)

Monitor runs whenever the following DTCs are not stored	None
IG1	On

C14DB

Monitor runs whenever the following DTCs are not stored	C146E (ABS solenoid power supply relay circuit low)
All of the following conditions are met	-
Vehicle electric power supply	Stable state
Command to ABS solenoid power supply relay	On
ABS solenoid power supply relay	On
ABS solenoid power supply relay fail (C146E)	Not detected

C14DE

Monitor runs whenever the following DTCs are not stored	C12FA (Main relay circuit low)
All of the following conditions are met	-
Vehicle electric power supply	Stable state
Command to main relay	On
Main relay	On
Main relay fail (C12FA)	Not detected

TYPICAL MALFUNCTION THRESHOLDS

C1241 (Case 1)

Both of the following conditions are met	-
Brake pedal stroke sensor assembly data	Invalid
Brake system voltage 1 (VM1)	6.92 V or less

C1241 (Case 2)

Both of the following conditions are met	-
Reaction force pressure sensor data	Invalid
Brake system voltage 1 (VM1)	8.27 V or less

C1241 (Case 3)

Both of the following conditions are met	-
Reaction force pressure sensor power supply	Less than 6.29 V, or higher than 7.64 V
Brake system voltage 1 (VM1)	8.27 V or less

C1241 (Case 4)

Both of the following conditions are met	-
Servo pressure sensor data	Invalid
Brake system voltage 1 (VM1)	8.27 V or less

C1241 (Case 5)

Both of the following conditions are met	-
Servo pressure sensor power supply	Less than 6.29 V, or higher than 7.64 V
Brake system voltage 1 (VM1)	8.27 V or less

C1241 (Case 6)

All of the following conditions are met	A, B and C
A. Power switch	Off
B. Either of the following conditions is met	-
Main relay	Off and there is on experience
ABS solenoid power supply relay	Off and there is on experience
C. Brake system voltage 1 (VM1)	6.92 V or less

C1241 (Case 7)

All of the following conditions are met	A, B, C and D
A. Power switch	On (READY)
B. Either of the following conditions is met	-
Main relay	Off and there is on experience
ABS solenoid power supply relay	Off and there is on experience
C. Brake system voltage 1 (VM1)	6.92 V or less
D. IG1 voltage	9.54 V or less

C1241 (Case 8)

Both of the following conditions are met	-
Accumulator pressure data	Invalid
Brake system voltage 2 (VM2)	8.27 V or less

C1241 (Case 9)

All of the following conditions are met	-
Serial communication with low side IC	Valid
Pump motor operating from IC	Enable
Accumulator pressure	Less than 15.3 MPa (156 kgf/cm2, 2219 psi) (Pump motor on pressure)
Brake system voltage 2 (VM2)	6.92 V or less

C1241 (Case 10)

All of the following conditions are met	-
Pump motor	Operating from IC
Pump motor voltage	Less than 6 V
Brake system voltage 2 (VM2)	6.92 V or less

C1241 (Case 11)

One of the following conditions is met	A, B or C
A. IG1 voltage	9.54 V or less
B. Both of the following conditions are met	-
IG2	On
IG2 voltage	9.54 V or less
C. Brake system voltage 1 (VM1)	7.54 V or less

C1241 (Case 12)

Both of the following conditions are met	-
Brake system voltage 1 (VM1)	7.54 V or less
Speed sensor power supply voltage (all of wheels)	Less than 6.1 V

C14DB (Case 1)

Both of the following conditions are met	-
Power supply for ABS solenoid	9.13 V or less
Brake control	Off

C14DB (Case 2)

Both of the following conditions are met	-
Power supply for ABS solenoid	9.13 V or less
Brake control	On

C14DE (Case 1)

All of the following conditions are met	A, B and C
A. Power supply for linear solenoid	9.13 V or less
B. Either of the following conditions is met	-
Linear solenoid (SLA) current drop signal	On
Linear solenoid (SLR) current drop signal	On
C. Brake control	On

C14DE (Case 2)

Both of the following conditions are met	-
Power supply for linear solenoid	9.13 V or less
Brake control	Off

C14DE (Case 3)

Both of the following conditions are met	-
Power supply for linear solenoid	9.13 V or less
Brake control	On

COMPONENT OPERATING RANGE

C1241 (Case 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10)

Both of the following conditions are met	-
Vehicle electric power supply	Stable state
Power supply common pass condition	Met

C1241 (Case 11)

All of the following conditions are met	-
Control valve solenoid	non-drive
IG1 voltage	Higher than 9.54 V
IG2 voltage	Higher than 9.54 V
Brake system voltage 1 (VM1)	Higher than 7.54 V

C1241 (Case 12)

Both of the following conditions are met	-
IG1	On
Brake system voltage 1 (VM1)	Higher than 7.54 V

C14DB

All of the following conditions are met	-
Vehicle electric power supply	Stable state
Command to ABS solenoid power supply relay	On
ABS solenoid power supply relay	On
ABS solenoid power supply relay fail (C146E)	Not detected
Power supply common pass condition	Met

C14DE

All of the following conditions are met	-
Vehicle electric power supply	Stable state
Command to main relay	On
Main relay	On
Main relay fail (C12FA)	Not detected
Power supply common pass condition	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 (READY).
Turn the Techstream on.
Drive the vehicle at 10 km/h (6 mph) or more for 60 seconds or more.
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

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
Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

CHECK DTC

(a) Check the DTCs that are output.

Click here

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
Only DTC C1241 is output.	A
DTC C1311 is output with DTC C1241.	B

GO TO DTC (C1311)

2.	CHECK AUXILIARY BATTERY

(a) Select the Data List on the Techstream.

Click here

Powertrain > Hybrid Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

BATT Voltage

Auxiliary battery voltage

(Battery voltage sensor power source voltage)

Min.: 0.00 V, Max.: 16.00 V

11.00 to 15.00 V

BATT terminal

Powertrain > Hybrid Control > Data List

Tester Display
BATT Voltage

(b) Check the Techstream display condition of the auxiliary battery voltage.

Result	Proceed to
The auxiliary battery voltage is 11 to 15 V.	A
The auxiliary battery voltage is below 11 V.	B

CHARGE OR REPLACE AUXILIARY BATTERY

3.	CHECK FREEZE FRAME DATA

(a) Check the INF code from the Freeze Frame Data stored when DTC (C1241) was stored.

Click here

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
INF code 101 or 551 is output.	A
INF code 102 or 552 is output.	B
INF code 103 is output.	C
INF code 554 is output.	D

GO TO STEP 5

GO TO STEP 6

GO TO STEP 7

4.	CHECK HARNESS AND CONNECTOR (BS TERMINAL)

(a) Turn the power switch off.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.

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 voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A35-52 (BS) - Body ground	Always	11 to 14 V

Result	Proceed to
11 to 14 V.	A
Below 11 V.	B

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR (BS CIRCUIT)

5.	CHECK HARNESS AND CONNECTOR (IG1, +BI1 AND BS TERMINAL)

(a) Turn the power switch off.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.

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) Turn the power switch on (IG).

(f) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A35-15 (+BI1) - Body ground	Power switch on (IG)	11 to 14 V
A35-52 (BS) - Body ground	Power switch on (IG)	11 to 14 V
A35-23 (IG1) - Body ground	Power switch on (IG)	11 to 14 V

Result	Proceed to
11 to 14 V.	A
Below 11 V.	B

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1, +BI1 AND/OR BS CIRCUIT)

6.	CHECK HARNESS AND CONNECTOR (IG1, IG2, +BI1, +BI2 AND BS TERMINAL)

(a) Turn the power switch off.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.

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) Turn the power switch on (IG).

(f) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A35-15 (+BI1) - Body ground	Power switch on (IG)	11 to 14 V
A35-5 (+BI2) - Body ground	Power switch on (IG)	11 to 14 V
A35-52 (BS) - Body ground	Power switch on (IG)	11 to 14 V
A35-23 (IG1) - Body ground	Power switch on (IG)	11 to 14 V
A35-9 (IG2) - Body ground	Power switch on (IG)	11 to 14 V

Result	Proceed to
11 to 14 V.	A
Below 11 V.	B

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1, IG2, +BI1, +BI2 AND/OR BS CIRCUIT)

7.	CHECK HARNESS AND CONNECTOR (IG1 AND IG2 TERMINAL)

(a) Turn the power switch off.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.

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) Turn the power switch on (IG).

(f) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A35-23 (IG1) - Body ground	Power switch on (IG)	11 to 14 V
A35-9 (IG2) - Body ground	Power switch on (IG)	11 to 14 V

Result	Proceed to
11 to 14 V.	A
Below 11 V.	B

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 AND/OR IG2 CIRCUIT)

Zero Point Calibration of Yaw Rate Sensor undone (C1210,C1336). SLA Linear Solenoid (C1211,C1212,C1225,C1226). Hydraulic Control System Malfunction (C1214)

Open Circuit in IG1/IG2 Power Source Circuit (C1242). Stroke Sensor (C1247,C1392). Brake Booster Pump Motor on Time Abnormally Long (C1252,C1253)

See More:

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