EASY AND SMOOTH START SYSTEM, Diagnostic DTC:C1389/118

DTC Code DTC Name
C1389/118 Tachometer Sensor

DESCRIPTION

The skid control ECU receives engine speed signals from the engine ECU via the tachometer circuit.

DTC Code DTC Detection Condition Trouble Area
C1389/118 With normal battery voltage, the clutch pedal released, gear engaged and the vehicle driven at 20 km/h (12 mph) or more, the engine is not running for 3 seconds or more.

  • Open or short in wire harness

  • Improperly connected connector or corroded terminal

  • Combination meter

  • Skid control ECU

WIRING DIAGRAM

A01CJ2WE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK TACHOMETER


    1. Use wheel chocks to secure the vehicle.

    2. Start the engine.

    3. Confirm the tachometer display in the combination meter Click here.

      OK
      The tachometer display changes in proportion to the engine speed.

    NG

    GO TO METER / GAUGE SYSTEM

    OK

  2. INSPECT SKID CONTROL ECU (TACH CIRCUIT)


    1. A01CGM9E04
      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
      S12-7 (TACH) - Body ground Engine running Below 2 V ←→ 10 V or more

      Note

      Perform the above inspection when connecting the skid control ECU actuator.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Perform a road test.

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

      Result
      Result Proceed to
      DTC (C1389/118) is not output A
      DTC (C1389/118) 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