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 engine switch is turned on (IG), and is turned off if an open or short in the solenoid is detected by self diagnosis performed when the vehicle starts running.

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

DTC No. DTC Detection Condition Trouble Area
C146E

Either of the following is detected:


  1. Both of the following conditions continue for 0.2 seconds or more.


    • The IG1 terminal voltage is 9.5 V or more.

    • The solenoid relay contact is open when the relay is on.

  2. Both of the following conditions continue for 0.2 seconds or more.


    • The IG1 terminal voltage becomes lower than 9.5 V when the relay is turned on.

    • The relay contact remains open.

  • ABS NO. 2 fuse (Fusible link block assembly)

  • ABS solenoid relay circuit

  • ABS solenoid relay (Brake actuator assembly)
C146F Immediately after the engine switch is turned on (IG), the solenoid relay contact is closed for 4 seconds when the relay is turned off.

  • ABS solenoid relay circuit

  • ABS solenoid relay (Brake actuator assembly)

WIRING DIAGRAM

A01G7UWE01

INSPECTION PROCEDURE

Note


  • When replacing the skid control ECU (brake actuator assembly), perform zero point calibration 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 Click here and/or Click here.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (+BS TERMINAL)


    1. A01G4YLE25
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator Assembly))

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

    2. Disconnect the A40 skid control ECU (brake actuator assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A40-12 (+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. A01G4YLE26
      Text in Illustration
      *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
      A40-1 (GND1) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT)

    OK

  3. RECONFIRM DTC

    Tech Tips


    • This DTC is stored when a problem is identified in the skid control ECU (brake actuator assembly).

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

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


    1. Reconnect the A40 skid control ECU (brake actuator assembly) connector.

    2. Clear the DTCs Click here.

    3. Turn the engine 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 output Click here.

      Result
      Result Proceed to
      DTCs C146E and C146F are not output. A
      DTCs C146E and/or C146F are output. B

      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 engine switch on (IG) and the stop light switch assembly off, the ECU performs self diagnosis of the solenoid circuit.

      • If the normal system code is output (No trouble codes are output), slightly jiggle the connectors, wire harnesses, 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.


    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

    USE SIMULATION METHOD TO CHECK Click here