EASY AND SMOOTH START SYSTEM, Diagnostic DTC:C1387/115

DTC Code DTC Name
C1387/115 ES Start Release Timing Switch

DESCRIPTION

The ES start timing switch can adjust the timing of releasing brake hydraulic pressure. When the timing switch is operated, a release timing input signal (FAST input signal or SLOW input signal) is input to the skid control ECU. In response to this input signal, the skid control ECU adjusts the timing of releasing the brake hydraulic pressure.

DTC Code DTC Detection Condition Trouble Area
C1387/115 The FAST terminal and SLOW terminal of the ES start main switch are both closed at the same time.

  • Short in wire harness

  • Improperly connected connector or corroded terminal

  • ES start timing switch

  • Skid control ECU

WIRING DIAGRAM

Refer to DTC C1386/116 Click here.

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT ES START TIMING SWITCH (POWER SOURCE CIRCUIT)


    1. A01CJAUE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to ES Start Timing Switch)

      Disconnect the ES start timing switch connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      E30-5 (MSW+) - Body ground Ignition switch ON 20 to 32 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  2. INSPECT ES START TIMING SWITCH


    1. Turn the ignition switch off.

    2. A01CHKU

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      5 (MSW+) - 2 (TSWF) ES start timing switch FAST ON Below 1 Ω
      ES start timing switch SLOW ON 10 kΩ or higher
      5 (MSW+) - 1 (TSWS) ES start timing switch FAST ON 10 kΩ or higher
      ES start timing switch SLOW ON Below 1 Ω

    NG

    REPLACE ES START TIMING SWITCH

    OK

  3. INSPECT SKID CONTROL ECU (TIMING SWITCH INPUT CIRCUIT)


    1. Install the ES start timing switch connector.

    2. Turn the ignition switch to ON.

    3. A01CGM9E03
      Text in Illustration
      *1

      Component with harness connected

      (Skid Control ECU)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      S12-5 (FAST) - Body ground ES start timing switch FAST ON 20 to 32 V
      ES start timing switch SLOW ON Below 2 V
      S12-6 (SLOW) - Body ground ES start timing switch FAST ON Below 2 V
      ES start timing switch SLOW ON 20 to 32 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. RECONFIRM DTC


    1. Clear the DTCs Click here.

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

      Result
      Result Proceed to
      DTC (C1387/115) is not output A
      DTC (C1387/115) is output B

      Tech Tips

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step Click here.


    B

    REPLACE SKID CONTROL ECU

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here