ANTI-LOCK BRAKE SYSTEM(for Type B), Diagnostic DTC:C146E and 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.

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 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 in ABS Solenoid Relay Circuit

Either of the following conditions 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.

  3. Both of the following conditions continue for 0.22 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

  • ABS solenoid relay circuit

  • Skid control ECU (Brake actuator assembly)

C146F

Short in ABS Solenoid Relay Circuit

Immediately after the ignition switch is turned to ON, the solenoid relay contact is closed for 4.5 seconds when the relay is turned off.

Skid control ECU (Brake actuator assembly)

WIRING DIAGRAM

C278260E02

CAUTION / NOTICE / HINT

Note:

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

PROCEDURE

  1. CHECK HARNESS AND CONNECTOR (+BS TERMINAL)

    1. C277404C12

      *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 A124 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

      A124-12 (+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. C277404C08

      *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

      A124-1 (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

    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 the DTC is output again before replacing the skid control ECU (brake actuator assembly).

    1. Reconnect the A124 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. Perform a road test.

    6. Check if the same DTC is output.

      Click here

      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 ignition switch ON and the stop light switch 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.

    A

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY

    Click hereClick here