Toyota Avalon (XX50): Power Supply Drive Circuit (C1257). HV Control System Regenerative Malfunction (C1259,C1310). Abnormal Zero Point of Steering Angle Sensor (C1290)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System(for Hv Model) / Power Supply Drive Circuit (C1257). HV Control System Regenerative Malfunction (C1259,C1310). Abnormal Zero Point of Steering Angle Sensor (C1290)

Power Supply Drive Circuit (C1257)

DESCRIPTION

The skid control ECU (brake booster with master cylinder assembly) detects a drop in accumulator pressure according to the signals from the accumulator pressure sensor, then operates and stops the motor relay as well as the pump motor.

The skid control ECU (brake booster with master cylinder assembly) troubleshoots the built-in motor relay drive circuit, and stores this DTC when a malfunction is detected.

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	MIL	Note
C1257	Power Supply Drive Circuit	361 362	INF Code: 361 After hard pump motor operation, when the accumulator pressure is less than 15.3 MPa (156 kgf/cm2, 2219 psi), the pump motor does not operate for 1 second or more. INF Code: 362 When a motor relay drive test is being performed, one or both motor relays do not operate for 0.2 seconds or more.	Skid control ECU (brake booster with master cylinder assembly)	Does not come on	Electronically controlled brake system DTC

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

MIL

Note

C1257

Power Supply Drive Circuit

361

362

INF Code: 361
- After hard pump motor operation, when the accumulator pressure is less than 15.3 MPa (156 kgf/cm2, 2219 psi), the pump motor does not operate for 1 second or more.

INF Code: 362
- When a motor relay drive test is being performed, one or both motor relays do not operate for 0.2 seconds or more.

Skid control ECU (brake booster with master cylinder assembly)

Does not come on

Electronically controlled brake system DTC

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

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 C1257 is output.	A
DTCs C1241, C1242 and/or C1253 are output.	B

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

HV Control System Regenerative Malfunction (C1259,C1310)

DESCRIPTION

The skid control ECU (brake booster with master cylinder assembly) communicates with the hybrid vehicle control ECU and controls braking force according to the motor's regenerative force.

The skid control ECU (brake booster with master cylinder assembly) sends enhanced-VSC signals to the hybrid vehicle control ECU and receives operating signals from the hybrid vehicle control ECU.

The skid control ECU (brake booster with master cylinder assembly) uses CAN communication for communicating with the hybrid vehicle control ECU. If a communication malfunction is detected, the skid control ECU (brake booster with master cylinder assembly) prohibits enhanced-VSC operation, brake hold operation and part of the electronically controlled brake system control as a fail-safe function.

If the signals from the hybrid vehicle control ECU return to normal, the warning light will go off and the DTCs C1259 and C1310 will be cleared.

HINT:

These DTCs will be output from the skid control ECU (brake booster with master cylinder assembly) when the hybrid vehicle control ECU sends a malfunction signal to the skid control ECU (brake booster with master cylinder assembly).

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	MIL	Note
C1259	HV Control System Regenerative Malfunction	1132	A regeneration malfunction signal is input for at least 0.036 seconds when IG2 terminal voltage is 9.5 V or more for at least 2 seconds and communication with the hybrid vehicle control ECU is valid.	Hybrid vehicle control ECU (Regeneration malfunction) Skid control ECU (brake booster with master cylinder assembly)	Does not come on	Electronically controlled brake system DTC HINT: The DTC is cleared when the conditions return to normal.
C1310	HV System Malfunction	1140 1141	INF Code: 1140 When the IG2 terminal voltage is 9.5 V or more for 2 seconds or more and communication with the hybrid vehicle control ECU is possible, an internal malfunction signal is detected for 0.072 seconds or more. INF Code: 1141 The hybrid control malfunction signal is received for at least 0.072 seconds from hybrid vehicle control ECU.	INF Code: 1140 Hybrid vehicle control ECU (VSC malfunction) Skid control ECU (brake booster with master cylinder assembly) INF Code: 1141 Hybrid vehicle control ECU (Brake hold control malfunction) Skid control ECU (brake booster with master cylinder assembly)	Does not come on	INF Code 1140: VSC DTC HINT: The DTC is cleared when the conditions return to normal. INF Code 1141: Brake hold DTC HINT: The DTC is cleared when the conditions return to normal.

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

MIL

Note

C1259

HV Control System Regenerative Malfunction

1132

A regeneration malfunction signal is input for at least 0.036 seconds when IG2 terminal voltage is 9.5 V or more for at least 2 seconds and communication with the hybrid vehicle control ECU is valid.

Hybrid vehicle control ECU
(Regeneration malfunction)
Skid control ECU (brake booster with master cylinder assembly)

Does not come on

Electronically controlled brake system DTC

HINT:

The DTC is cleared when the conditions return to normal.

C1310

HV System Malfunction

1140

1141

INF Code: 1140
- When the IG2 terminal voltage is 9.5 V or more for 2 seconds or more and communication with the hybrid vehicle control ECU is possible, an internal malfunction signal is detected for 0.072 seconds or more.

INF Code: 1141
- The hybrid control malfunction signal is received for at least 0.072 seconds from hybrid vehicle control ECU.

INF Code: 1140
- Hybrid vehicle control ECU
  (VSC malfunction)
- Skid control ECU (brake booster with master cylinder assembly)
INF Code: 1141
- Hybrid vehicle control ECU
  (Brake hold control malfunction)
- Skid control ECU (brake booster with master cylinder assembly)

Does not come on

INF Code 1140: VSC DTC
HINT:

The DTC is cleared when the conditions return to normal.
INF Code 1141: Brake hold DTC
HINT:

The DTC is cleared when the conditions return to normal.

CAUTION / NOTICE / HINT

NOTICE:

Click here

PROCEDURE

1.	CHECK DTC (HYBRID CONTROL SYSTEM)

(a) Check if a hybrid control system DTCs are output.

Click here

Powertrain > Hybrid Control > Trouble Codes

Result	Proceed to
DTCs are not output.	A
DTCs are output.	B

INSPECT HYBRID CONTROL SYSTEM

2.	CHECK DTC (MOTOR GENERATOR CONTROL SYSTEM)

(a) Check if a motor generator control system DTCs are output.

Click here

Powertrain > Motor Generator > Trouble Codes

Result	Proceed to
DTCs are not output.	A
DTCs are output.	B

INSPECT MOTOR GENERATOR CONTROL SYSTEM

3.	CHECK DTC (SFI SYSTEM)

(a) Check if a SFI system DTCs are output.

Click here

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTCs are not output.	A
DTCs are output.	B

INSPECT SFI SYSTEM

4.	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
DTCs C1259 and/or C1310 are output.	A
DTCs other than C1259 and C1310 are output.	B
DTCs are not output.	C

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

USE SIMULATION METHOD TO CHECK

Abnormal Zero Point of Steering Angle Sensor (C1290)

DESCRIPTION

The skid control ECU (brake booster with master cylinder assembly) acquires the steering angle sensor zero point every time the power switch on (READY) and the vehicle is driven at 35 km/h (22 mph) or more for approximately 5 seconds. The skid control ECU (brake booster with master cylinder assembly) also stores the previous zero point.

If front wheel alignment or the steering wheel position is adjusted without disconnecting the cable from the negative (-) auxiliary battery terminal, or if the yaw rate and acceleration sensor zero point is not acquired after the adjustments have been completed, the skid control ECU (brake booster with master cylinder assembly) detects the difference between the previous zero point and newly acquired zero point and stores this DTC to indicate a poor adjustment.

Warning operation for the steering angle sensor zero point malfunction will be canceled by turning the power switch off.

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	MIL	Note
C1290	Abnormal Zero Point of Steering Angle Sensor	751	The steering angle sensor zero point calibration position vastly differs from the recorded value.	Yaw rate and acceleration sensor zero point calibration incomplete Poor adjustment of the center position of the steering wheel Poor adjustment of front wheel alignment	Does not come on	VSC DTC

PROCEDURE

1.	PERFORM ZERO POINT CALIBRATION OF YAW RATE AND ACCELERATION SENSOR

(a) Perform zero point calibration of the yaw rate and acceleration sensor.

Click here

NOTICE:

Make sure to perform linear solenoid valve offset learning, ABS holding solenoid valve learning, brake pedal stroke sensor assembly zero point calibration and system information memorization after performing "Reset Memory" as the data stored during linear solenoid valve offset learning, ABS holding solenoid valve learning, brake pedal stroke sensor assembly zero point calibration and system information memorization is cleared.

Chassis > ABS/VSC/TRAC > Utility

Tester Display
Reset Memory

Chassis > ABS/VSC/TRAC > Utility

Tester Display
Test Mode

HINT:

When the stored zero point of the yaw rate and acceleration sensor is cleared, the steering angle sensor zero point will also be cleared.
If the zero point and output value of the yaw rate and acceleration sensor and the output value of the speed sensors are not normal, steering angle sensor zero point cannot be acquired normally even if the vehicle is driven straight ahead at 35 km/h (22 mph) or more.

2.	CHECK STEERING ANGLE SENSOR ZERO POINT CALIBRATION

(a) Turn the power switch off.

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

(d) Check that the centered position of the steering wheel is correctly set while driving straight ahead.

OK:

The steering wheel is centered correctly.

HINT:

If front wheel alignment and steering position are adjusted as a result of the steering wheel being off-center, acquire the yaw rate and acceleration sensor zero point again after the adjustments are completed.

END

ADJUST FRONT WHEEL ALIGNMENT OR STEERING POSITION

Accumulator Low Pressure (C1256)

Skid Control ECU Malfunction (C1300)

See More:

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