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Home >> Infiniti >> 2017 >> QX30 Base >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> LAN System (Can) >> DTC/Circuit Diagnosis >> Can PDEC (Powertrain) - Fuel Pump Control Module Circuit >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK HARNESS CONNECTOR CONNECTION

    Check the following harness connector for disconnection or looseness.

    • CAN potential distributor electrical connector (powertrain)
    • Fuel pump control module

    Is the inspection result normal?

    YES 

    GO TO STEP 2  .

    NO 

    Securely connect the harness connectors.

  2. CHECK POWER SUPPLY AND GROUND CIRCUIT

    Check power supply and ground circuit for fuel pump control module. Refer to DIAGNOSIS PROCEDURE .

    Is the inspection result normal?

    YES 

    GO TO STEP 3  .

    NO 

    Repair or replace the malfunctioning part.

  3. CHECK CIRCUIT (SHORT TO BATTERY)

    1. Turn ignition switch OFF.
    2. Disconnect the following unit connectors.
      • CAN potential distributor electrical connector (powertrain)
      • Fuel pump control module
    3. Check voltage between CAN potential distributor electrical connector (powertrain) harness connector and ground.
      Terminals Voltage
      (Approx.)
      + -
      CAN potential distributor electrical connector (powertrain) Ground
      Connector Terminal
      M176 1 - 0 V
      2

    Is the inspection result normal?

    YES 

    GO TO STEP 4  .

    NO 

    Repair or replace harness.

  4. CHECK CIRCUIT (SHORT TO GROUND)

    Check continuity between CAN potential distributor electrical connector (powertrain) harness connector and ground.

    CAN potential distributor electrical connector (powertrain) Ground Continuity
    Connector Terminal
    M176 1 - Not existed
    2

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    Repair or replace harness.

  5. CHECK CIRCUIT (SHORT WITH CAN-H AND CAN-L)

    Check continuity between CAN potential distributor electrical connector (powertrain) harness connector terminals.

    CAN potential distributor electrical connector (powertrain) Continuity
    Connector Terminal Connector Terminal
    M176 1 M176 2 Not existed

    Is the inspection result normal?

    YES 

    GO TO STEP 6  .

    NO 

    Repair or replace harness.

  6. CHECK CIRCUIT (OPEN)

    Check continuity between the following unit harness connectors.

    • CAN potential distributor electrical connector (powertrain)
    • Fuel pump control module
      CAN POTENTIAL DISTRIBUTOR ELECTRICAL CONNECTOR (POWERTRAIN) - FUEL PUMP CONTROL MODULE (FOR 2WD MODELS)

      CAN potential distributor electrical connector (powertrain) Fuel pump control module Continuity
      Connector Terminal Connector Terminal
      M176 1 M135 3 Existed
      2 4
      CAN POTENTIAL DISTRIBUTOR ELECTRICAL CONNECTOR (POWERTRAIN) - FUEL PUMP CONTROL MODULE (FOR AWD MODELS)

      CAN potential distributor electrical connector (powertrain) Fuel pump control module Continuity
      Connector Terminal Connector Terminal
      M176 1 M136 10 Existed
      2 9

    Is the inspection result normal?

    YES 

    INSPECTION END

    NO 

    Repair or replace harness.

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