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ECD SYSTEM (w/ DPF) Injector Circuit

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DTC Code DTC Name
  Injector Circuit
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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.

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WIRING DIAGRAM

Refer to DTC P0201 (Click here).

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INSPECTION PROCEDURE

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PROCEDURE


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    CHECK TERMINAL VOLTAGE (POWER SOURCE)


    1. Turn the engine switch off.

      Tip:

      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. A015828E25

      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
      Table 1. 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))

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


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    INSPECT FUSE (EFI MAIN AND EFI MAIN 2)


    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

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    INSPECT EDU RELAY (EDU 1 OR EDU 2)


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


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    INSPECT INTEGRATION RELAY (EFI OR EFI MAIN 2)


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


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    CHECK HARNESS AND CONNECTOR (EDU RELAY - EDU)


    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
      Table 2. 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
      Table 3. 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

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    CHECK HARNESS AND CONNECTOR (EDU RELAY - ECM)


    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
      Table 4. 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
      Table 5. 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
      Table 6. 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
      Table 7. 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

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


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

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

    3. A01583OE01

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

      Standard Resistance
      Table 8. 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
      Table 9. 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

    4. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      Table 10. 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
      Table 11. 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
      Table 12. 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
      Table 13. 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

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    CHECK HARNESS AND CONNECTOR (EDU - BODY GROUND)


    1. A015828E26

      Disconnect the EDU connector.

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

      Standard Resistance
      Table 14. No. 1
      Tester Connection Condition Specified Condition
      C150-1 (GND) - Body ground Always Below 1 Ω
      Standard Resistance
      Table 15. No. 2
      Tester Connection Condition Specified Condition
      C154-1 (GND) - Body ground Always Below 1 Ω

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

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    REPLACE EDU RELAY (EDU 1 OR EDU 2)

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    REPLACE INTEGRATION RELAY

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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

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    CHECK FOR INTERMITTENT PROBLEMSClick here

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    CHECK ECM POWER SOURCE CIRCUITClick here