ECD SYSTEM 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 P0201 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 (EDU) (POWER SOURCE)


    1. A01IRVUE35
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Injector Driver (EDU))

      Disconnect the injector driver (EDU) connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      C59-2 (+B) - C59-4 (GND) Ignition switch ON 11 to 14 V

    NG

    INSPECT INTEGRATION RELAY (EDU RELAY) Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

  2. INSPECT INTEGRATION RELAY (EDU RELAY)


    1. Inspect the integration relay (EDU relay) Click here.


    NG

    REPLACE INTEGRATION RELAY

    OK

  3. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - EDU)

    A01ITDOE05
    Text in Illustration
    *1 Engine Room No. 1 Relay Block
    *a

    Front view of wire harness connector

    (to EDU)
    *b

    Front view of wire harness connector

    (to Integration Relay)

    1. Remove the integration relay from the engine room No. 1 relay block.

    2. Disconnect the injector driver (EDU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C59-2 (+B) - 1B-8 Always Below 1 Ω
      C59-4 (GND) - Body ground Always Below 1 Ω
      C59-2 (+B) or 1B-8 - Body ground Always 10 kΩ or higher

    4. Reconnect the injector driver (EDU) connector.

    5. Reinstall the integration relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 1 RELAY BLOCK)


    1. A01IP0GE05
      Text in Illustration
      *1 Engine Room No. 1 Relay Block
      *2 EFI MAIN Relay
      *a

      Front view of wire harness connector

      (to Integration Relay)

      Remove the integration relay from the engine room No. 1 relay block.

    2. Remove the EFI MAIN relay from the engine room No. 1 relay block.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      1C-1 - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (EFI MAIN relay holder) - 1B-6 Always Below 1 Ω
      3 (EFI MAIN relay holder) or 1B-6 - Body ground Always 10 kΩ or higher

    5. Reinstall the integration relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - ECM)

    A01IUPQE05
    Text in Illustration
    *1 Engine Room No. 1 Relay Block
    *a

    Front view of wire harness connector

    (to ECM)
    *b

    Front view of wire harness connector

    (to Integration Relay)

    1. Remove the integration relay from the engine room No. 1 relay block.

    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
      A51-44 (IREL) - 1B-7 Always Below 1 Ω
      A51-44 (IREL) or 1B-7 - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reinstall the integration relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here