ELECTRONICALLY CONTROLLED 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

These DTCs are stored when a problem is identified in the skid control ECU (brake actuator assembly).

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

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 is starting off.

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

Either of the following is detected:


  • 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.

  • 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.

  • VSC NO. 2 fuse

  • Wire harness or connector

  • Skid control ECU (brake actuator assembly)

 -
C146F Short 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) -
C146E DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition - - -
Malfunction Status When voltage at terminal +BS is 9.5 V or higher and solenoid relay is ON, relay contact is OFF continuously ○ -
When solenoid relay is turned on and voltage at +BS terminal is below 9.5 V, relay contact does not turn on after - ○
Detection Time 0.22 seconds or more. 0.22 seconds or more.
Number of Trips 1 trip 1 trip

WIRING DIAGRAM

B006CP0E31

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 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 engine switch off.

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

    3. Disconnect the A9 skid control ECU (brake actuator assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A9-38 (+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. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A9-25 (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

    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 A9 skid control ECU (brake actuator assembly) connector.

    2. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the engine 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

      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 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.


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY for LHD: Click here
    REPLACE BRAKE ACTUATOR ASSEMBLY for RHD: Click here