Toyota Avalon Service & Repair Manual: 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.

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

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

B

INSPECT HYBRID CONTROL SYSTEM

A

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

B

INSPECT MOTOR GENERATOR CONTROL SYSTEM

A

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

B

INSPECT SFI SYSTEM

A

4.

RECONFIRM DTC

(a) Clear the DTCs.

Click here

Chassis > ABS/VSC/TRAC > Clear DTCs

(b) Turn the power switch off.

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

(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

A

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

B

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

C

USE SIMULATION METHOD TO CHECK

    Power Supply Drive Circuit (C1257)

    Abnormal Zero Point of Steering Angle Sensor (C1290)

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