ECD SYSTEM, Diagnostic DTC:14 (4)

DTC Code DTC Name
14 (4) Timing Control System Malfunction

DESCRIPTION

The ECM controls the injection timing by actuating the timing control valve. The timing control valve is mounted on the injection pump and controls the pump internal fuel pressure through duty control.

The ECM detects the injection advance angle based on TDC and NE signals.

DTC No. DTC Detection Condition Trouble Area
14 (4) During and after engine warm up, actual injection timing is different from target value of ECM calculated for several sec.

  • Open or short in timing control valve circuit

  • Timing control valve

  • Fuel filter (Clogging)

  • Fuel (Frozen, air present)

  • Injection pump (Internal pressure and timing control valve)

  • ECM

WIRING DIAGRAM

A01DUYSE01

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT TIMING CONTROL VALVE


    1. A01DZYNE01

      Disconnect the timing control valve connector.

    2. Measure the resistance of the timing control valve.

      Standard resistance
      Tester Connection Condition Specified Condition
      1 - 2 20°C (68°F) 10 to 14 Ω

    NG

    REPLACE TIMING CONTROL VALVE

    OK

  2. CHECK ECM (TCV VOLTAGE)


    1. A01DWNME06

      Disconnect the E23 ECM connector.

    2. Turn the ignition switch ON.

    3. Measure the voltage of the wire harness side connector.

      Standard voltage
      Tester Connection Specified Condition
      E23-11 (TCV) - Body ground 9 to 14 V

    NG

    CHECK TIMING CONTROL VALVE (POWER SOURCE) Click here

    OK

  3. CHECK ECM (TCV VOLTAGE, SIGNAL)


    1. A01DXTRE03

      Turn the ignition switch ON.

    2. Measure the voltage of the ECM connector.

      Standard voltage
      Tester Connection Specified Condition
      E23-11 (TCV) - E23-14 (E1) 9 to 14 V

    3. While idling, measure the waveform according to the value(s) in the table below.

      OK
      Tester Connection Specified Condition
      E23-11 (TCV) - E23-14 (E1) Correct waveform is as shown

    NG

    REPLACE ECM

    OK

  4. CHECK FUEL FILTER


    1. Check the fuel filter Click here.


    NG

    REPLACE FUEL FILTER

    OK

  5. CHECK FUEL LEAK


    1. Visually check the injection pump, each injector and fuel line for fuel leaks.

      OK
      No leakage

    NG

    REPAIR OR REPLACE PART WITH FUEL LEAKAGE

    OK

    CHECK AND REPLACE INJECTION PUMP ASSEMBLY

  6. CHECK TIMING CONTROL VALVE (POWER SOURCE)


    1. A01DXIBE03

      Disconnect the T29 timing control valve connector.

    2. Turn the ignition switch ON.

    3. Measure the voltage of the wire harness side connector.

      Standard voltage
      Tester Connection Specified Condition
      T29-1 - Body ground 9 to 14 V

    OK

    REPAIR OR REPLACE HARNESS AND CONNECTOR (TIMING CONTROL VALVE - ECM)

    NG

  7. CHECK WIRE HARNESS (ECM - INTEGRATION RELAY [MAIN RELAY])


    1. A01DWWSE03

      Disconnect the T29 timing control valve connector.

    2. Disconnect the E23 ECM connector.

    3. Disconnect the 1J integration relay connector from the engine room junction block.

    4. Measure the resistance of the wire harness side connectors.

      Standard resistance
      Tester Connection Specified Condition
      T29-1 - 1J-5 Below 1 Ω
      E23-11 (TCV) - Body ground 10 kΩ or higher
      T29-1 - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    CHECK ECM POWER SOURCE CIRCUIT