Lexus NX: 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 VSC (cooperative control with EPS) 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 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

Note

C1259

HV Control System Regenerative Malfunction

-

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)

-

C1310

HV System Malfunction

-

431

  • INF Code: -
    • An internal malfunction signal is input for at least 0.072 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.
  • INF Code: 431
    • The hybrid control malfunction signal is received for at least 0.072 seconds from hybrid vehicle control ECU.

Hybrid vehicle control ECU

-

PROCEDURE

1.

CHECK HYBRID CONTROL SYSTEM

(a) Check if a hybrid control system DTC is output.

Click here

Powertrain > Hybrid Control > Trouble Codes

Result

Proceed to

DTCs are not output.

A

DTCs are output

B

A

REPLACE HYBRID VEHICLE CONTROL ECU

B

INSPECT HYBRID CONTROL SYSTEM

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