ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C146E, C146F

DESCRIPTION

The ABS solenoid relay built into the skid control ECU (brake booster with master cylinder assembly) supplies power to the holding solenoid and reduction solenoid.

The ABS solenoid relay is operated 1.5 seconds after the power switch is turned on (IG), and is turned off if an open or short in the ABS solenoid is detected during self-diagnosis when the vehicle starts driving.

WIRING DIAGRAM

Refer to DTCs C1352, C1353, C1354, C1355, C1356, C1357, C1358 and C1359.

Click here

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (BS TERMINAL)

   
   
   1. 

      *a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

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

      OK
      The connector is securely connected.

   2. Disconnect the A32 skid control ECU (brake booster with master cylinder assembly) connector.

   3. Check both the connector case and the terminals for deformation and corrosion.

      OK
      No deformation or corrosion.

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

      Standard Voltage
      Tester Connection Condition Specified Condition A32-52 (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 (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - BRAKE ACTUATOR ASSEMBLY)

   
   

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

      OK
      The connector is securely connected.

   2. Disconnect the A33 brake actuator assembly connector (for LHD).

   3. Disconnect the A34 brake actuator assembly connector (for RHD).

   4. Check both the connector case and the terminals for deformation and corrosion.

      OK
      No deformation or corrosion.

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

      Standard Resistance
      for LHD Tester Connection Condition Specified Condition A32-14 (+BS) - A33-38 (+BS) Always Below 1 Ω A32-14 (+BS) or A33-38 (+BS) - Body ground Always 10 kΩ or higher A32-48 (SFRH) - A33-8 (SFRH) Always Below 1 Ω A32-48 (SFRH) or A33-8 (SFRH) - Body ground Always 10 kΩ or higher A32-49 (SFLH) - A33-37 (SFLH) Always Below 1 Ω A32-49 (SFLH) or A33-37 (SFLH) - Body ground Always 10 kΩ or higher A32-50 (SRRH) - A33-11 (SRRH) Always Below 1 Ω A32-50 (SRRH) or A33-11 (SRRH) - Body ground Always 10 kΩ or higher A32-51 (SRLH) - A33-34 (SRLH) Always Below 1 Ω A32-51 (SRLH) or A33-34 (SRLH) - Body ground Always 10 kΩ or higher A32-44 (SFRR) - A33-2 (SFRR) Always Below 1 Ω A32-44 (SFRR) or A33-2 (SFRR) - Body ground Always 10 kΩ or higher A32-45 (SFLR) - A33-31 (SFLR) Always Below 1 Ω A32-45 (SFLR) or A33-31 (SFLR) - Body ground Always 10 kΩ or higher A32-46 (SRRR) - A33-5 (SRRR) Always Below 1 Ω A32-46 (SRRR) or A33-5 (SRRR) - Body ground Always 10 kΩ or higher A32-47 (SRLR) - A33-28 (SRLR) Always Below 1 Ω A32-47 (SRLR) or A33-28 (SRLR) - Body ground Always 10 kΩ or higher
      for RHD Tester Connection Condition Specified Condition A32-14 (+BS) - A34-38 (+BS) Always Below 1 Ω A32-14 (+BS) or A34-38 (+BS) - Body ground Always 10 kΩ or higher A32-48 (SFRH) - A34-37 (SFRH) Always Below 1 Ω A32-48 (SFRH) or A34-37 (SFRH) - Body ground Always 10 kΩ or higher A32-49 (SFLH) - A34-8 (SFLH) Always Below 1 Ω A32-49 (SFLH) or A34-8 (SFLH) - Body ground Always 10 kΩ or higher A32-50 (SRRH) - A34-34 (SRRH) Always Below 1 Ω A32-50 (SRRH) or A34-34 (SRRH) - Body ground Always 10 kΩ or higher A32-51 (SRLH) - A34-11 (SRLH) Always Below 1 Ω A32-51 (SRLH) or A34-11 (SRLH) - Body ground Always 10 kΩ or higher A32-44 (SFRR) - A34-31 (SFRR) Always Below 1 Ω A32-44 (SFRR) or A34-31 (SFRR) - Body ground Always 10 kΩ or higher A32-45 (SFLR) - A34-2 (SFLR) Always Below 1 Ω A32-45 (SFLR) or A34-2 (SFLR) - Body ground Always 10 kΩ or higher A32-46 (SRRR) - A34-28 (SRRR) Always Below 1 Ω A32-46 (SRRR) or A34-28 (SRRR) - Body ground Always 10 kΩ or higher A32-47 (SRLR) - A34-5 (SRLR) Always Below 1 Ω A32-47 (SRLR) or A34-5 (SRLR) - Body ground Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. RECONFIRM DTC

   
   

   1. Reconnect the A32 skid control ECU (brake booster with master cylinder assembly) connector.

   2. Reconnect the A33 brake actuator assembly connector (for LHD).

   3. Reconnect the A34 brake actuator assembly connector (for RHD).

   4. Clear the DTCs.

      Click here

      
      Chassis > ABS/VSC/TRC > Clear DTCs

   5. Turn the power switch off.

   6. Turn the power switch on (READY).

   7. Perform a road test.

   8. 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 20 km/h (12 mph) or more is sent to the skid control ECU (brake booster with master cylinder assembly) with the power switch on (IG) and the stop light switch assembly off, the ECU performs self diagnosis of the motor and solenoid circuits.

      • If the normal system code is output (no DTCs are output), slightly jiggle the connectors, wire harness, and fuses of the skid control ECU (brake booster with master cylinder assembly).

      • If any DTCs are output while jiggling a connector or wire harness from the brake booster with master cylinder assembly, inspect and repair the connector or wire harness.

      • The DTCs were probably output due to a bad connection of the connector terminal.

   
   

   A

   USE SIMULATION METHOD TO CHECK Click here

   B

   REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for LHD: Click here REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY for RHD: Click here