EMISSION CONTROL SYSTEM Timing Control Valve Circuit

DESCRIPTION

The emission ECU control the injection timing by actuating the timing control valve. The timing control valve is mounted on the injection pump and delay the timing by duty control of pump internal fuel pressure.

The emission ECU detects the injection advance angle by TDC and NE signals.

WIRING DIAGRAM

A01KH4UE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK INJECTION PUMP ASSEMBLY (TIMING CONTROL VALVE)


    NG

    CHECK AND REPLACE INJECTION PUMP ASSEMBLY (TIMING CONTROL VALVE)

    OK

  2. CHECK EMISSION CONTROL ECU


    1. Turn the ignition switch ON.

    2. A01KH5YE01

      Measure the voltage between terminals TCV and E1 of the emission ECU connector Click here.

      VOLTAGE
      9 - 14 V

    NG

    CHECK AND REPLACE EMISSION CONTROL ECU Click here

    OK

  3. CHECK FUEL FILTER CLOGGING


    1. Check fuel filter clogging, fuel freezing and fuel air in.


    NG

    REPLACE FUEL FILTER

    OK

    CHECK AND REPLACE INJECTION PUMP ASSEMBLY (TIMING CONTROL VALVE)