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 P062D Click here.

PROCEDURE


  1. CHECK EDU (POWER SOURCE)


    1. Disconnect the No. 1 injector driver (EDU) connectors.

    2. A01WZA2E01

      Disconnect the No. 2 injector driver (EDU) connectors.

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

      Standard Voltage
      No. 1
      Tester Connection Switch Condition Specified Condition
      C74-8 (+B) - C73-1 (GND) Ignition switch ON 11 to 14 V
      No. 2
      Tester Connection Switch Condition Specified Condition
      C76-8 (+B) - C75-1 (GND) Ignition switch ON 11 to 14 V

    OK

    REPLACE INJECTOR DRIVER (No. 1 or No. 2) Click here

    NG

  2. INSPECT FUSE (EFI)

    A01X3HOE01
    Engine Room Relay Block
    *1 EFI MAIN 2
    *2 EFI MAIN

    1. Remove the EFI MAIN and EFI MAIN 2 fuse from the engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      EFI MAIN fuse Always Below 1 Ω
      EFI MAIN 2 fuse Always Below 1 Ω

    NG

    CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE

    OK

  3. INSPECT EDU RELAY (EDU 1 OR EDU 2)


    1. Inspect the EDU relay (EDU 1 or EDU 2) Click here.


    NG

    REPLACE EDU RELAY (EDU 1 OR EDU 2)

    OK

  4. INSPECT INTEGRATION NO.1 RELAY (EFI OR EFI MAIN 2)


    1. Inspect the Integration relay (EFI or EFI MAIN 2) Click here.


    NG

    REPLACE INTEGRATION NO.1 RELAY

    OK

  5. CHECK HARNESS AND CONNECTOR (EDU RELAY - EDU)

    A01X9L9E01

    1. Remove the EDU relay (EDU 1 or EDU 2) from the engine room relay block.

    2. Remove the EDU connector.

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

      Standard Resistance (Check for Open)
      No. 1
      Tester Connection Condition Specified Condition
      EDU 1 relay (5) - C74-8 (+B) Always Below 1 Ω
      No. 2
      Tester Connection Condition Specified Condition
      EDU 2 relay (5) - C76-8 (+B) Always Below 1 Ω
      Standard Resistance (Check for Short)
      No. 1
      Tester Connection Condition Specified Condition
      EDU 1 relay (5) or C74-8 (+B) - Body ground Always 10 kΩ or higher
      No. 2
      Tester Connection Condition Specified Condition
      EDU 2 relay (5) or C76-8 (+B) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (EDU RELAY - ECM)

    A01X55LE01

    1. Remove the EDU relay (EDU 1 or EDU 2) from the engine room relay block.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      No. 1 (LHD)
      Tester Connection Condition Specified Condition
      EDU 1 relay (2) - A38-45 (IREL) Always Below 1 Ω
      No. 2 (LHD)
      Tester Connection Condition Specified Condition
      EDU 2 relay (2) - A38-46 (IRL2) Always Below 1 Ω
      No. 1 (RHD)
      Tester Connection Condition Specified Condition
      EDU 1 relay (2) - A52-45 (IREL) Always Below 1 Ω
      No. 2 (RHD)
      Tester Connection Condition Specified Condition
      EDU 2 relay (2) - A52-46 (IRL2) Always Below 1 Ω
      Standard Resistance (Check for Short)
      No. 1 (LHD)
      Tester Connection Condition Specified Condition
      EDU 1 relay (2) or A38-45 (IREL) - Body ground Always 10 kΩ or higher
      No. 2 (LHD)
      Tester Connection Condition Specified Condition
      EDU 2 relay (2) or A38-46 (IRL2) - Body ground Always 10 kΩ or higher
      No. 1 (RHD)
      Tester Connection Condition Specified Condition
      EDU 1 relay (2) or A52-45 (IREL) - Body ground Always 10 kΩ or higher
      No. 2 (RHD)
      Tester Connection Condition Specified Condition
      EDU 2 relay (2) or A52-46 (IRL2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - EDU RELAY, ECM, BODY GROUND)

    A01X5Z7E01
    *a Front view of wire harness connector: (to Engine Room Relay Block)
    *b Integration Relay

    1. Remove the integration relay from the engine room relay block.

    2. Remove the EDU relay (EDU 1 or EDU 2).

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

      Standard Resistance (Check for Open)
      No. 1
      Tester Connection Condition Specified Condition
      1B-4 - EDU 1 relay (1) Always Below 1 Ω
      1B-4 - EDU 1 relay (3) Always Below 1 Ω
      No. 2
      Tester Connection Condition Specified Condition
      1A-4 - EDU 2 relay (1) Always Below 1 Ω
      1A-4 - EDU 2 relay (3) Always Below 1 Ω
      Standard Resistance (Check for Short)
      No. 1
      Tester Connection Condition Specified Condition
      1B-4 or EDU 1 relay (1) - Body ground Always 10 kΩ or higher
      1B-4 or EDU 1 relay (3) - Body ground Always 10 kΩ or higher
      No. 2
      Tester Connection Condition Specified Condition
      1A-4 or EDU 2 relay (1) - Body ground Always 10 kΩ or higher
      1A-4 or EDU 2 relay (3) - Body ground Always 10 kΩ or higher
      A01X8TBE01

    4. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      No. 1 (LHD)
      Tester Connection Condition Specified Condition
      1B-2 - A38-44 (MREL) Always Below 1 Ω
      1B-3 - Body ground Always Below 1 Ω
      No. 2 (LHD)
      Tester Connection Condition Specified Condition
      1A-2 - A38-44 (MREL) Always Below 1 Ω
      1A-3 - Body ground Always Below 1 Ω
      No. 1 (RHD)
      Tester Connection Condition Specified Condition
      1B-2 - A52-44 (MREL) Always Below 1 Ω
      1B-3 - Body ground Always Below 1 Ω
      No. 2 (RHD)
      Tester Connection Condition Specified Condition
      1A-2 - A52-44 (MREL) Always Below 1 Ω
      1A-3 - Body ground Always Below 1 Ω
      Standard Resistance (Check for Short)
      No. 1 (LHD)
      Tester Connection Condition Specified Condition
      1B-2 or A38-44 (MREL) - Body ground Always 10 kΩ or higher
      No. 2 (LHD)
      Tester Connection Condition Specified Condition
      1A-2 or A38-44 (MREL) - Body ground Always 10 kΩ or higher
      No. 1 (RHD)
      Tester Connection Condition Specified Condition
      1B-2 or A52-44 (MREL) - Body ground Always 10 kΩ or higher
      No. 2 (RHD)
      Tester Connection Condition Specified Condition
      1A-2 or A52-44 (MREL) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (EDU - BODY GROUND)


    1. A01X5EME01

      Disconnect the EDU connector.

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

      Standard Resistance
      No. 1
      Tester Connection Condition Specified Condition
      C73-1 (GND) - Body ground Always Below 1 Ω
      Standard Resistance
      No. 2
      Tester Connection Condition Specified Condition
      C75-1 (GND) - Body ground Always Below 1 Ω

    OK

    CHECK ECM POWER SOURCE CIRCUIT Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (EDU - BODY GROUND)