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VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C146E, C146F

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DTC Code DTC Name
C146E Open Circuit in ABS Solenoid Relay Circuit
C146F Short Circuit in ABS Solenoid Relay Circuit
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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. Detection Item DTC Detection Condition Trouble Area
C146E Open Circuit in ABS Solenoid Relay Circuit

Either of the following is detected:


  1. When the 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.

  2. When the 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.

  • Wire harness or connector

  • Skid control ECU (brake actuator assembly)
C146F Short Circuit in ABS Solenoid Relay Circuit Immediately after engine switch turned on (IG) and solenoid relay is OFF, relay contact is ON continuously for 4.5 seconds or more. Skid control ECU (brake actuator assembly)
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

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

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

Tip:

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

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PROCEDURE


  1. Click here

    CHECK HARNESS AND CONNECTOR (+BS TERMINAL)


    1. B0066Q4C23
      *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 A86 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
      A86-38 (+BS) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR (+BS CIRCUIT)

  2. Click here

    CHECK HARNESS AND CONNECTOR (GND1 TERMINAL)


    1. B0066Q4C24
      *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
      A86-25 (GND1) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT)

  3. Click here

    RECONFIRM DTC

    Tip:

    • 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 any DTCs are output again before replacing the skid control ECU (brake actuator assembly).


    1. Reconnect the A86 skid control ECU (brake actuator assembly) connector.

    2. Clear the DTCs.

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      1. Chassis > ABS/VSC/TRC > Clear DTCs


    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.

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      1. Chassis > ABS/VSC/TRC > Trouble Codes


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

      • 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 DTC is output (no DTCs 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.