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СИСТЕМА ECD, Diagnostic DTC:P1220

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DTC Code DTC Name
P1220 Timer Control Circuit
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DESCRIPTION

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

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

DTC No. DTC Detection Condition Trouble Area
P1220 During and after engine warm up, actual injection timing is different from target value of ECM calculated for several second.

  • Open or short in timing control valve circuit

  • Timing control valve

  • Fuel filter element sub-assembly (Clogging)

  • Fuel (Freezing, air present)

  • Injection or supply pump assembly (Internal pressure and timing control valve)

  • ECM
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tip:

Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

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PROCEDURE


  1. Click here

    INSPECT TIMING CONTROL VALVE


    1. A003D8QE01

      Disconnect the timer control valve connector.

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

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

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    INSPECT TIMING CONTROL VALVE (POWER SOURCE)


    1. A003B89E05

      Disconnect the timing control valve 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 Switch Condition Specified Condition
      D61-1 - Body ground Ignition switch ON 11 to 14 V
      Table 1. Text in Illustration
      *a

      Front view of wire harness connector

      (to Timing Control Valve)

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    CHECK HARNESS AND CONNECTOR (TIMING CONTROL VALVE - ECM)


    1. Disconnect the timing control valve connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D61-2 - D100-42 (TCV) Always Below 1 Ω
      D61-2 or D100-42 (TCV) - Body ground Always 10 kΩ or higher

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    CHECK FUEL FILTER ELEMENT SUB-ASSEMBLY


    1. Check the fuel filter element sub-assembly assembly (Click here).


  5. Click here

    CHECK FUEL LEAK


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

      OK
      No leakage

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    REPLACE INJECTION OR SUPPLY PUMP ASSEMBLY


    1. Replace the injection or supply pump assembly (Click here).


  7. Click here

    CHECK READ OUTPUT DTC (DTC P1220 IS OUTPUT AGAIN)


    1. Clear the DTC (Click here).

    2. Start the engine.

    3. Idle the engine for 20 sec. or more.

    4. Read the DTC (Click here).

      Result
      Display (DTC output) Proceed to
      DTC P1220 is output again A
      No DTC output B

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    REPAIR OR REPLACE HARNESS OR CONNECTOR (TIMING CONTROL VALVE - NO. 1 INTEGRATION RELAY)

  9. Click here

    REPLACE TIMING CONTROL VALVE

  10. Click here

    REPLACE FUEL FILTER ELEMENT SUB-ASSEMBLYClick here

  11. Click here

    REPAIR FUEL LEAK

  12. Click here

    END

  13. Click here

    REPLACE ECMClick here