ECD SYSTEM(w/ 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 P0201 Click here.

PROCEDURE


  1. CHECK TERMINAL VOLTAGE (POWER SOURCE)


    1. Turn the engine switch off.

      Tech Tips

      Powering of the EDU relay may be prohibited by the fail-safe function. Therefore, turn the engine switch off to disable the failsafe function before performing this inspection.

    2. A01X90ZE01
      Text in Illustration
      *A for Bank 1 (No. 1 injector Driver (EDU))
      *B for Bank 2 (No. 2 injector Driver (EDU))
      *a

      Front view of wire harness connector

      (to Injector Driver (EDU))

      Disconnect the No. 1 or No. 2 injector driver (EDU) connector.

    3. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      C150-3 (+B) - C150-1 (GND) Engine switch on (IG) 11 to 14 V
      C154-3 (+B) - C154-1 (GND) Engine switch on (IG) 11 to 14 V

    5. Reconnect the No. 1 or No. 2 injector driver (EDU) connector.


    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

  2. INSPECT FUSE (EFI MAIN AND EFI MAIN 2)

    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 RELAY (EFI OR EFI MAIN 2)


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


    NG

    REPLACE INTEGRATION RELAY

    OK

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

    A01X9SHE01

    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
      No. 1
      Tester Connection Condition Specified Condition
      EDU 1 relay (5) - C150-3 (+B) Always Below 1 Ω
      EDU 1 relay (5) or C150-3 (+B) - Body ground Always 10 kΩ or higher
      No. 2
      Tester Connection Condition Specified Condition
      EDU 2 relay (5) - C154-3 (+B) Always Below 1 Ω
      EDU 2 relay (5) or C154-3 (+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
      No. 1 (LHD)
      Tester Connection Condition Specified Condition
      EDU 1 relay (2) - A38-45 (IREL) Always Below 1 Ω
      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) - A38-46 (IRL2) Always Below 1 Ω
      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) - A52-45 (IREL) Always Below 1 Ω
      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) - A52-46 (IRL2) Always Below 1 Ω
      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
      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
      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 - EDU 2 relay (1) Always Below 1 Ω
      1A-4 - EDU 2 relay (3) Always Below 1 Ω
      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
      1B-2 or A38-44 (MREL) - Body ground Always 10 kΩ or higher
      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
      1A-2 or A38-44 (MREL) - Body ground Always 10 kΩ or higher
      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
      1B-2 or A52-44 (MREL) - Body ground Always 10 kΩ or higher
      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
      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. A01XBAXE01

      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
      C150-1 (GND) - Body ground Always Below 1 Ω
      Standard Resistance
      No. 2
      Tester Connection Condition Specified Condition
      C154-1 (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)