Toyota Tundra Service Manual: SM Solenoid Circuit (C1225-C1228,C1468,C1469,C146A,C146B)

Toyota Tundra Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / SM Solenoid Circuit (C1225-C1228,C1468,C1469,C146A,C146B)

DESCRIPTION

These solenoids turn on when signals are received from the skid control ECU (brake actuator assembly) and they control the pressure acting on the wheel cylinders to control the braking force.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1225

SM Solenoid Circuit

When there is a difference between the requested current value of solenoid valve and the measured current value of the solenoid valve.

  • Solenoid circuit
  • Solenoid valve (brake actuator assembly)

C1226

SA2 Solenoid Circuit

When there is a difference between the requested current value of solenoid valve and the measured current value of the solenoid valve.

  • Solenoid circuit
  • Solenoid valve (brake actuator assembly)

C1227

SA3 Solenoid Circuit

When there is a difference between the requested current value of solenoid valve and the measured current value of the solenoid valve.

  • Solenoid circuit
  • Solenoid valve (brake actuator assembly)

C1228

STR Solenoid Circuit

When there is a difference between the requested current value of solenoid valve and the measured current value of the solenoid valve.

  • Solenoid circuit
  • Solenoid valve (brake actuator assembly)

C1468

SFR Solenoid Circuit

When there is a difference between the requested current value of solenoid valve and the measured current value of the solenoid valve.

  • Solenoid circuit
  • Solenoid valve (brake actuator assembly)

C1469

SFL Solenoid Circuit

When there is a difference between the requested current value of solenoid valve and the measured current value of the solenoid valve.

  • Solenoid circuit
  • Solenoid valve (brake actuator assembly)

C146A

SRR Solenoid Circuit

When there is a difference between the requested current value of solenoid valve and the measured current value of the solenoid valve.

  • Solenoid circuit
  • Solenoid valve (brake actuator assembly)

C146B

SRL Solenoid Circuit

When there is a difference between the requested current value of solenoid valve and the measured current value of the solenoid valve.

  • Solenoid circuit
  • Solenoid valve (brake actuator assembly)

WIRING DIAGRAM

Refer to DTC C146E.

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CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake actuator assembly), perform system variant learning and acceleration sensor zero point calibration.

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PROCEDURE

1.

RECONFIRM DTC

HINT:

These codes are detected when a problem is determined in the skid control ECU (brake actuator assembly).

The solenoid circuits are in the skid control ECU (brake actuator assembly).

Therefore, solenoid circuit inspection and solenoid unit inspection cannot be performed. Be sure to check if any DTCs are output before replacing the skid control ECU (brake actuator assembly).

(a) Clear the DTCs.

(b) Turn the ignition switch off.

(c) Start the engine.

(d) Drive the vehicle.

(e) Check if the same DTC is output.

Result

Proceed to

Both C1225, C1226, C1227, C1228, C1468, C1469, C146A and C146B are not output

A

C1225, C1226, C1227, C1228, C1468, C1469, C146A or C146B is output

B

HINT:

  • The skid control ECU (brake actuator assembly) performs self diagnosis of the solenoid circuit after the ignition switch is turned to ON.
  • If the normal system code is output (no DTCs are output), slightly jiggle the connectors, wire harness, and fuses of the skid control ECU (brake actuator assembly).
  • If any DTCs are output while jiggling a connector or wire harness of the skid control ECU (brake actuator assembly), inspect and repair the connector or wire harness.
  • If no DTCs were output when reconfirming DTCs, checking for intermittent problems is necessary because it is suspected that the original DTCs were stored due to the poor connection of a connector terminal.
A

USE SIMULATION METHOD TO CHECK

B

REPLACE BRAKE ACTUATOR ASSEMBLY

    Engine Control System Malfunction (C1201)

    Yaw Rate Sensor (C1234,C1472,C1474)

    See More:

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