ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C146E, C146F

DTC Code DTC Name
C146E Open in ABS Solenoid Relay Circuit
C146F Short in ABS Solenoid Relay Circuit

DESCRIPTION

The solenoid relay supplies power to the solenoid and TRC solenoid.

The solenoid relay is turned on 1.5 seconds after the ignition switch is turned to ON, and is turned off if an open or short in the solenoid is detected by the self diagnosis performed when the engine starts running.

The solenoid relay is housed in the skid control ECU in the actuator assembly.

DTC Code DTC Detection Condition Trouble Area
C146E

Either of the following is detected:


  1. When voltage at terminal IG1 is 9.5 V or higher and solenoid relay is ON, relay contact is OFF continuously for 0.22 seconds or more.

  2. When solenoid relay is turned on and voltage at IG1 terminal is below 9.5 V, relay contact does not turn on after 0.22 seconds or more.

  • ABS NO. 2 fuse

  • Wire harness or connector

  • Skid control ECU (Brake actuator assembly)
C146F Immediately after the ignition switch is turned to ON, the solenoid relay contact is closed for 4 seconds when the relay is turned off. Skid control ECU (Brake actuator assembly)

WIRING DIAGRAM

Refer to DTCs C1225, C1468, C1469, C146A and C146B Click here.

CAUTION / NOTICE / HINT

Note


  • When replacing the skid control ECU (brake actuator assembly), perform calibration Click here.

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

Tech Tips

When DTC C1241 is output together with DTC C146E and/or C146F, inspect and repair the trouble areas indicated by DTC C1241 first Click here.

PROCEDURE


  1. CHECK TERMINAL VOLTAGE (+BS)


    1. Turn the ignition switch off.

    2. Disconnect the A6 skid control ECU (brake actuator assembly) connector.

    3. B001HIME01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator Assembly))

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A6-12 (+BS) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (+BS CIRCUIT)

    OK

  2. CHECK HARNESS AND CONNECTOR (GND1 TERMINAL)


    1. Disconnect the A6 skid control ECU (brake actuator assembly) connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A6-1 (GND1) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT)

    OK

  3. RECONFIRM DTC

    Tech Tips

    This code is stored when a problem is identified in theskid control ECU (brake actuator assembly).

    The solenoid circuit is in the skid control ECU (brake actuator assembly).

    Therefore, solenoid circuit inspections and solenoid unit inspections cannot be performed. Be sure to check if the DTC is output before replacing the skid control ECU (brake actuator assembly).


    1. Reconnect the A6 skid control ECU (brake actuator assembly) connector.

    2. Clear the DTCs Click here.

    3. Start the engine.

    4. Drive the vehicle at a speed of 20 km/h (12 mph) or more for 30 seconds or more.

    5. Check if the same DTC is output Click here.

      Result
      Result Proceed to
      DTC not output A
      DTC output B

      Tech Tips


      • If a speed signal of 6 km/h (4 mph) or more is input to theskid control ECU (brake actuator assembly) with the ignition switch ON and the stop light switch off, the ECU performs self-diagnosis of the motor and solenoid circuits.

      • If the normal system code is output (the trouble code is not output), slightly jiggle the connectors, wire harnesses, and fuses of the skid control ECU (brake actuator assembly). Make sure that no DTCs are output.

      • 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. The DTCs were probably output due to a bad connection of the connector terminal.


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here