VEHICLE STABILITY CONTROL 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 ABS solenoid relay supplies power to the ABS solenoid and TRC solenoid.

The solenoid relay is turned on 1.5 seconds after the ignition switch is turned 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 ABS solenoid relay is housed in the skid control ECU in the actuator assembly.

DTC No. Detection Item DTC Detection Condition Trouble Area
C146E Open in ABS Solenoid Relay Circuit

Either of the following is detected:


  1. When voltage at terminal +BS is 9.5 V or higher and solenoid relay is ON, relay contact is OFF continuously for 0.22 seconds or more (exceptre start due to stop and start control*).

  2. When solenoid relay is turned on and voltage at +BS 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 Short in ABS Solenoid Relay Circuit Immediately after ignition switch turned ON and solenoid relay is OFF, relay contact is ON continuously for 4.5 seconds or more. Skid control ECU (Brake actuator assembly)

WIRING DIAGRAM

B0025NXE04

CAUTION / NOTICE / HINT

Note


  • When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information.

    Click here

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

Tech Tips

When C1241 and/or C1417 is output together with C146E and/or C146F, inspect and repair the trouble areas indicated by C1241 and/or C1417 first.

for C1241: Click here

for C1417: Click here

PROCEDURE


  1. CHECK TERMINAL VOLTAGE (+BS TERMINAL)


    1. Turn the ignition switch off.

    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

    3. Disconnect the A4 skid control ECU (brake actuator assembly) connector.

    4. B0024ICC61
      *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
      A4-38 (+BS) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (+BS CIRCUIT)

    OK

  2. CHECK HARNESS AND CONNECTOR (GND1 TERMINAL)


    1. B0024ICC62
      *a

      Front view of wire harness connector

      (to Skid Control ECU [Brake Actuator Assembly])

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A4-25 (GND1) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT)

    OK

  3. RECONFIRM DTC

    Tech Tips

    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).


    1. Reconnect the A4 skid control ECU (brake actuator assembly) connector.

    2. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the ignition switch off.

    4. Start the engine.

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

    6. Check if the same DTC is recorded.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Proceed to
      DTC C146E and/or C146F are not output
      DTC C146E and C146F are output

      Tech Tips


      • If a speed signal of 6 km/h (4 mph) or more is input to the skid control ECU (brake actuator assembly), with the ignition switch to 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 harness, 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 from 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.


    DTC C146E and/or C146F are not output

    USE SIMULATION METHOD TO CHECK Click here

    DTC C146E and C146F are output

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here