ECD SYSTEM (w/o DPF) Injector Circuit

DESCRIPTION

The injector driver drives the injectors at high speeds with a high-voltage DC/DC converter. The ECM constantly monitors the injector driver and stops the engine if an abnormal condition is detected.

WIRING DIAGRAM

Refer to DTC P0200 Click here.

INSPECTION PROCEDURE

Note


  • After replacing the ECM, the new ECM needs registration Click here and initialization Click here.

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

PROCEDURE


  1. CHECK INJECTOR DRIVER (POWER SOURCE)


    1. A003GD9E15
      Text in Illustration
      *a

      Front view of wire harness connector

      (to injector driver)

      Disconnect the injector driver connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      B49-2 (+B) - B49-3 (GND) Ignition switch ON 11 to 14 V

    3. Reconnect the injector driver connectors.


    NG

    INSPECT NO. 1 INTEGRATION RELAY (EDU) Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

  2. INSPECT NO. 1 INTEGRATION RELAY (EDU)


    1. Inspect the No. 1 integration relay (EDU) Click here.


    NG

    REPLACE NO. 1 INTEGRATION RELAY (EDU)

    OK

  3. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY (EDU) - INJECTOR DRIVER)


    1. Remove the No. 1 integration relay from the No. 1 engine room relay block and junction block assembly.

    2. Disconnect the injector driver connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B49-2 (+B) - 10A-8 Always Below 1 Ω
      B49-3 (GND) - Body ground Always Below 1 Ω
      B49-2 (+B) or 10A-8 - Body ground Always 10 kΩ or higher

    4. Reconnect the injector driver connector.

    5. Reinstall the No. 1 integration relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - ECM)


    1. Remove the No. 1 integration relay from the No. 1 engine room relay block and junction block assembly.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      B72-44 (IREL) - 10A-7 Always Below 1 Ω
      B72-44 (IREL) or 10A-7 - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reinstall the No. 1 integration relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here