ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1315/31, C1316/32, C1352/21, C1353/23, C1354/25, C1355/27, C1356/22, C1357/24, C1358/26, C1359/28

DTC Code DTC Name
C1315/31 SMC1 Changeover Solenoid Malfunction
C1316/32 SMC2 Changeover Solenoid Malfunction
C1352/21 Front Increasing Pressure Solenoid RH Malfunction
C1353/23 Front Increasing Pressure Solenoid LH Malfunction
C1354/25 Rear Increasing Pressure Solenoid RH Malfunction
C1355/27 Rear Increasing Pressure Solenoid LH Malfunction
C1356/22 Front Decreasing Pressure Solenoid RH Malfunction
C1357/24 Front Decreasing Pressure Solenoid LH Malfunction
C1358/26 Rear Decreasing Pressure Solenoid RH Malfunction
C1359/28 Rear Decreasing Pressure Solenoid LH Malfunction

DESCRIPTION

Each solenoid adjusts pressure which affects each wheel cylinder according to signals from the skid control ECU assembly and controls the vehicle.

The master cut solenoid (SMC1/2) is closed and blocks the master cylinder pressure from the electronically controlled brake system control pressure when the system is normal. The master cut solenoid is open and sends the master cylinder hydraulic pressure to the non-assisted brake wheel cylinders during the fail safe due to a system malfunction.

DTC Code INF Code DTC Detection Condition Trouble Area
C1315/31 61

Either of the following is detected:


  1. SMC1 drive circuit is malfunctioning for 0.05 seconds or more.

  2. Short to +B in SMC1.

  • Brake actuator assembly (SMC1)

  • SMC1 circuit

  • Skid control ECU assembly
↑ 62 Current leaks for 0.05 seconds or more when SMC1 is off. ↑
↑ 63 Open circuit in SMC1 continues for 0.05 seconds or more. ↑
↑ 64 Overcurrent in SMC1 continues for 0.05 seconds or more. ↑
C1316/32 66

Either of the following is detected:


  1. SMC2 drive circuit is malfunctioning for 0.05 seconds or more.

  2. Short to +B in SMC2.

  • Brake actuator assembly (SMC2)

  • SMC2 circuit

  • Skid control ECU assembly
↑ 67 Current leaks for 0.05 seconds or more when SMC2 is off. ↑
↑ 68 Open circuit in SMC2 continues for 0.05 seconds or more. ↑
↑ 69 Overcurrent in SMC2 continues for 0.05 seconds or more. ↑
C1352/21 11 Open circuit in FRA continues for 0.05 seconds or more when FRA is off.

  • Brake actuator assembly (FRA)

  • FRA circuit

  • Skid control ECU assembly
↑ 12 Open circuit in FRA continues for 0.05 seconds or more when FRA is on. ↑
↑ 13 Short to +B or voltage leak in FRA continues for 0.05 seconds or more. ↑
↑ 14 Overcurrent in FRA continues for 0.05 seconds or more. ↑
C1353/23 21 Open circuit in FLA continues for 0.05 seconds or more when FLA is off.

  • Brake actuator assembly (FLA)

  • FLA circuit

  • Skid control ECU assembly
↑ 22 Open circuit in FLA continues for 0.05 seconds or more when FLA is on. ↑
↑ 23 Short to +B or voltage leak in FLA continues for 0.05 seconds or more. ↑
↑ 24 Overcurrent in FLA continues for 0.05 seconds or more. ↑
C1354/25 31 Open circuit in RRA continues for 0.05 seconds or more when RRA is off.

  • Brake actuator assembly (RRA)

  • RRA circuit

  • Skid control ECU assembly
↑ 32 Open circuit in RRA continues for 0.05 seconds or more when RRA is on. ↑
↑ 33 Short to +B or voltage leak in RRA continues for 0.05 seconds or more. ↑
↑ 34 Overcurrent in RRA continues for 0.05 seconds or more. ↑
C1355/27 41 Open circuit in RLA continues for 0.05 seconds or more when RLA is off.

  • Brake actuator assembly (RLA)

  • RLA circuit

  • Skid control ECU assembly
↑ 42 Open circuit in RLA continues for 0.05 seconds or more when RLA is on. ↑
↑ 43 Short to +B or voltage leak in RLA continues for 0.05 seconds or more. ↑
↑ 44 Overcurrent in RLA continues for 0.05 seconds or more. ↑
C1356/22 16 Open circuit in FRR continues for 0.05 seconds or more when FRR is off.

  • Brake actuator assembly (FRR)

  • FRR circuit

  • Skid control ECU assembly
↑ 17 Open circuit in FRR continues for 0.05 seconds or more when FRR is on. ↑
↑ 18 Short to +B or voltage leak in FRR continues for 0.05 seconds or more. ↑
↑ 19 Overcurrent in FRR continues for 0.05 seconds or more. ↑
C1357/24 26 Open circuit in FLR continues for 0.05 seconds or more when FLR is off.

  • Brake actuator assembly (FLR)

  • FLR circuit

  • Skid control ECU assembly
↑ 27 Open circuit in FLR continues for 0.05 seconds or more when FLR is on. ↑
↑ 28 Short to +B or voltage leak in FLR continues for 0.05 seconds or more. ↑
↑ 29 Overcurrent in FLR continues for 0.05 seconds or more. ↑
C1358/26 36 Open circuit in RRR continues for 0.05 seconds or more when RRR is off.

  • Brake actuator assembly (RRR)

  • RRR circuit

  • Skid control ECU assembly
↑ 37 Open circuit in RRR continues for 0.05 seconds or more when RRR is on. ↑
↑ 38 Short to +B or voltage leak in RRR continues for 0.05 seconds or more. ↑
↑ 39 Overcurrent in RRR continues for 0.05 seconds or more. ↑
C1359/28 46 Open circuit in RLR continues for 0.05 seconds or more when RLR is off.

  • Brake actuator assembly (RLR)

  • RLR circuit

  • Skid control ECU assembly
↑ 47 Open circuit in RLR continues for 0.05 seconds or more when RLR is on. ↑
↑ 48 Short to +B or voltage leak in RLR continues for 0.05 seconds or more. ↑
↑ 49 Overcurrent in RLR continues for 0.05 seconds or more. ↑

WIRING DIAGRAM

B002C4ZE30
B002BG2E28

CAUTION / NOTICE / HINT

Note

When replacing the skid control ECU assembly or brake actuator assembly, perform initialization and calibration of the linear solenoid valve Click here.

PROCEDURE


  1. INSPECT BRAKE ACTUATOR ASSEMBLY

    B002BW4E02
    Text in Illustration
    *A for LHD *B for RHD
    *a

    Component without harness connected

    (Brake Actuator Assembly)

    		 - -

    1. Disconnect the A12 brake actuator assembly connector.

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

      Tech Tips

      Check the brake actuator assembly when it is cooled down.

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      20 (SMC1) - 19 (BS1) Always 15.3 to 25.0 Ω
      20 (SMC1) - Body ground Always 10 kΩ or higher
      6 (SMC2) - 7 (BS2) Always 15.3 to 25.0 Ω
      6 (SMC2) - Body ground Always 10 kΩ or higher
      8 (FRA+) - 5 (FRA-) Always 3.6 to 6.0 Ω
      8 (FRA+) - Body ground Always 10 kΩ or higher
      13 (FLA+) - 14 (FLA-) Always 3.6 to 6.0 Ω
      13 (FLA+) - Body ground Always 10 kΩ or higher
      12 (RRA+) - 11 (RRA-) Always 3.6 to 6.0 Ω
      12 (RRA+) - Body ground Always 10 kΩ or higher
      10 (RLA+) - 9 (RLA-) Always 3.6 to 6.0 Ω
      10 (RLA+) - Body ground Always 10 kΩ or higher
      22 (FRR+) - 21 (FRR-) Always 3.6 to 6.0 Ω
      22 (FRR+) - Body ground Always 10 kΩ or higher
      27 (FLR+) - 28 (FLR-) Always 3.6 to 6.0 Ω
      27 (FLR+) - Body ground Always 10 kΩ or higher
      26 (RRR+) - 25 (RRR-) Always 4.4 to 7.0 Ω
      26 (RRR+) - Body ground Always 10 kΩ or higher
      24 (RLR+) - 23 (RLR-) Always 4.4 to 7.0 Ω
      24 (RLR+) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      37 (SMC1) - 36 (BS1) Always 15.3 to 25.0 Ω
      37 (SMC1) - Body ground Always 10 kΩ or higher
      19 (SMC2) - 20 (BS2) Always 15.3 to 25.0 Ω
      19 (SMC2) - Body ground Always 10 kΩ or higher
      44 (FRA+) - 43 (FRA-) Always 3.6 to 6.0 Ω
      44 (FRA+) - Body ground Always 10 kΩ or higher
      28 (FRR+) - 27 (FRR-) Always 3.6 to 6.0 Ω
      28 (FRR+) - Body ground Always 10 kΩ or higher
      35 (FLA+) - 38 (FLA-) Always 3.6 to 6.0 Ω
      35 (FLA+) - Body ground Always 10 kΩ or higher
      21 (FLR+) - 22 (FLR-) Always 3.6 to 6.0 Ω
      21 (FLR+) - Body ground Always 10 kΩ or higher
      39 (RRA+) - 40 (RRA-) Always 3.6 to 6.0 Ω
      39 (RRA+) - Body ground Always 10 kΩ or higher
      41 (RLA+) - 42 (RLA-) Always 3.6 to 6.0 Ω
      41 (RLA+) - Body ground Always 10 kΩ or higher
      23 (RRR+) - 24 (RRR-) Always 4.4 to 7.0 Ω
      23 (RRR+) - Body ground Always 10 kΩ or higher
      25 (RLR+) - 26 (RLR-) Always 4.4 to 7.0 Ω
      25 (RLR+) - Body ground Always 10 kΩ or higher

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - BRAKE ACTUATOR ASSEMBLY)


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

    2. Disconnect the A14 and A16 skid control ECU assembly connectors.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A14-5 (SMC1) - A12-20 (SMC1) Always Below 1 Ω
      A14-5 (SMC1) - Body ground Always 10 kΩ or higher
      A16-6 (SMC2) - A12-6 (SMC2) Always Below 1 Ω
      A16-6 (SMC2) - Body ground Always 10 kΩ or higher
      A14-17 (FRA+) - A12-8 (FRA+) Always Below 1 Ω
      A14-17 (FRA+) - Body ground Always 10 kΩ or higher
      A14-18 (FRA-) - A12-5 (FRA-) Always Below 1 Ω
      A14-18 (FRA-) - Body ground Always 10 kΩ or higher
      A16-17 (FLA+) - A12-13 (FLA+) Always Below 1 Ω
      A16-17 (FLA+) - Body ground Always 10 kΩ or higher
      A16-18 (FLA-) - A12-14 (FLA-) Always Below 1 Ω
      A16-18 (FLA-) - Body ground Always 10 kΩ or higher
      A16-20 (RRA+) - A12-12 (RRA+) Always Below 1 Ω
      A16-20 (RRA+) - Body ground Always 10 kΩ or higher
      A16-21 (RRA-) - A12-11 (RRA-) Always Below 1 Ω
      A16-21 (RRA-) - Body ground Always 10 kΩ or higher
      A14-19 (RLA+) - A12-10 (RLA+) Always Below 1 Ω
      A14-19 (RLA+) - Body ground Always 10 kΩ or higher
      A14-20 (RLA-) - A12-9 (RLA-) Always Below 1 Ω
      A14-20 (RLA-) - Body ground Always 10 kΩ or higher
      A14-4 (FRR+) - A12-22 (FRR+) Always Below 1 Ω
      A14-4 (FRR+) - Body ground Always 10 kΩ or higher
      A14-3 (FRR-) - A12-21 (FRR-) Always Below 1 Ω
      A14-3 (FRR-) - Body ground Always 10 kΩ or higher
      A16-4 (FLR+) - A12-27 (FLR+) Always Below 1 Ω
      A16-4 (FLR+) - Body ground Always 10 kΩ or higher
      A16-3 (FLR-) - A12-28 (FLR-) Always Below 1 Ω
      A16-3 (FLR-) - Body ground Always 10 kΩ or higher
      A16-34 (RRR+) - A12-26 (RRR+) Always Below 1 Ω
      A16-34 (RRR+) - Body ground Always 10 kΩ or higher
      A16-33 (RRR-) - A12-25 (RRR-) Always Below 1 Ω
      A16-33 (RRR-) - Body ground Always 10 kΩ or higher
      A14-34 (RLR+) - A12-24 (RLR+) Always Below 1 Ω
      A14-34 (RLR+) - Body ground Always 10 kΩ or higher
      A14-33 (RLR-) - A12-23 (RLR-) Always Below 1 Ω
      A14-33 (RLR-) - Body ground Always 10 kΩ or higher
      A14-32 (BS01) - A12-19 (BS1) Always Below 1 Ω
      A14-32 (BS01) - Body ground Always 10 kΩ or higher
      A16-32 (BS02) - A12-7 (BS2) Always Below 1 Ω
      A16-32 (BS02) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      A14-5 (SMC1) - A12-37 (SMC1) Always Below 1 Ω
      A14-5 (SMC1) - Body ground Always 10 kΩ or higher
      A16-6 (SMC2) - A12-19 (SMC2) Always Below 1 Ω
      A16-6 (SMC2) - Body ground Always 10 kΩ or higher
      A14-17 (FRA+) - A12-44 (FRA+) Always Below 1 Ω
      A14-17 (FRA+) - Body ground Always 10 kΩ or higher
      A14-18 (FRA-) - A12-43 (FRA-) Always Below 1 Ω
      A14-18 (FRA-) - Body ground Always 10 kΩ or higher
      A16-17 (FLA+) - A12-35 (FLA+) Always Below 1 Ω
      A16-17 (FLA+) - Body ground Always 10 kΩ or higher
      A16-18 (FLA-) - A12-38 (FLA-) Always Below 1 Ω
      A16-18 (FLA-) - Body ground Always 10 kΩ or higher
      A16-20 (RRA+) - A12-39 (RRA+) Always Below 1 Ω
      A16-20 (RRA+) - Body ground Always 10 kΩ or higher
      A16-21 (RRA-) - A12-40 (RRA-) Always Below 1 Ω
      A16-21 (RRA-) - Body ground Always 10 kΩ or higher
      A14-19 (RLA+) - A12-41 (RLA+) Always Below 1 Ω
      A14-19 (RLA+) - Body ground Always 10 kΩ or higher
      A14-20 (RLA-) - A12-42 (RLA-) Always Below 1 Ω
      A14-20 (RLA-) - Body ground Always 10 kΩ or higher
      A14-4 (FRR+) - A12-28 (FRR+) Always Below 1 Ω
      A14-4 (FRR+) - Body ground Always 10 kΩ or higher
      A14-3 (FRR-) - A12-27 (FRR-) Always Below 1 Ω
      A14-3 (FRR-) - Body ground Always 10 kΩ or higher
      A16-4 (FLR+) - A12-21 (FLR+) Always Below 1 Ω
      A16-4 (FLR+) - Body ground Always 10 kΩ or higher
      A16-3 (FLR-) - A12-22 (FLR-) Always Below 1 Ω
      A16-3 (FLR-) - Body ground Always 10 kΩ or higher
      A16-34 (RRR+) - A12-23 (RRR+) Always Below 1 Ω
      A16-34 (RRR+) - Body ground Always 10 kΩ or higher
      A16-33 (RRR-) - A12-24 (RRR-) Always Below 1 Ω
      A16-33 (RRR-) - Body ground Always 10 kΩ or higher
      A14-34 (RLR+) - A12-25 (RLR+) Always Below 1 Ω
      A14-34 (RLR+) - Body ground Always 10 kΩ or higher
      A14-33 (RLR-) - A12-26 (RLR-) Always Below 1 Ω
      A14-33 (RLR-) - Body ground Always 10 kΩ or higher
      A14-32 (BS01) - A12-36 (BS1) Always Below 1 Ω
      A14-32 (BS01) - Body ground Always 10 kΩ or higher
      A16-32 (BS02) - A12-20 (BS2) Always Below 1 Ω
      A16-32 (BS02) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. RECONFIRM DTC


    1. Reconnect the skid control ECU assembly connectors and the brake actuator connector.

    2. Clear the DTCs Click here.

    3. Turn the power switch on (READY).

    4. Check if the same DTC is recorded Click here.

      Result
      Result Proceed to
      DTCs (C1315/31, C1316/32, C1352/21, C1353/23, C1354/25, C1355/27, C1356/22, C1357/24, C1358/26 and C1359/28) are not output A
      DTCs (C1315/31, C1316/32, C1352/21, C1353/23, C1354/25, C1355/27, C1356/22, C1357/24, C1358/26 and/or C1359/28) are output B

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

    REPLACE SKID CONTROL ECU ASSEMBLY Click here