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Home >> Infiniti >> 2024 >> Q50 Luxe, RWD >> Repair and Diagnosis >> Steering >> Steering Control Systems >> Steering Control System >> Component Parts /Circuit Diagnosis >> Power Supply And Ground Circuit (Power Steering Control Module) >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK THE GROUND CIRCUIT 
    1. Turn the ignition switch OFF.
    2. Disconnect power steering control module harness connector.
    3. Check the continuity between power steering control module harness connector and ground.
      Power steering control module - Continuity
      Connector Terminal
      E177 1 Ground Existed

    Is the inspection result normal?

    YES>>

    GO TO 2.

    NO>>

    Repair open circuit in harness or connectors.

  2. CHECK THE BATTERY POWER SUPPLY CIRCUIT (1) 

    Check the voltage between power steering control module harness connector and ground.

    Power steering control module - Voltage
    (Approx.)
    Connector Terminal
    E177 2 Ground 10.5 - 16 V

    Is the inspection result normal?

    YES>>

    GO TO 4.

    NO>>

    GO TO 3.

  3. CHECK THE BATTERY POWER SUPPLY CIRCUIT (2) 
    1. Check the 100A fusible link (#J).
    2. Check the harness for open or short between power steering control module harness connector No. 2 terminal and the 100A fusible link (#J).

    Is the inspection result normal?

    YES>>

    Perform the trouble diagnosis for battery power supply circuit.

    NO>>

    Repair or replace error-detected parts.

  4. CHECK THE IGNITION POWER SUPPLY CIRCUIT (1) 
    1. Check the voltage between power steering control module harness connector and ground.
      Power steering control module - Voltage
      (Approx.)
      Connector Terminal
      E176 4 Ground 0 V
    2. Turn the ignition switch ON.
    3. Check the voltage between power steering control module harness connector and ground.
      Power steering control module - Voltage
      (Approx.)
      Connector Terminal
      E176 4 Ground 10.5 - 16 V

    Is the inspection result normal?

    YES>>

    GO TO 6.

    NO>>

    GO TO 5.

  5. CHECK THE IGNITION POWER SUPPLY CIRCUIT (2) 
    1. Turn the ignition switch OFF.
    2. Check the 10A fuse (#12).
    3. Check the continuity between power steering control module harness connector and fuse block (J/B) harness connector.
      Power steering control module Fuse block (J/B) Continuity
      Connector Terminal Connector Terminal
      E176 4 E65 11F Existed
    4. Check the continuity between power steering control module harness connector and ground.
      Power steering control module - Continuity
      Connector Terminal
      E176 4 Ground Not existed

    Is the inspection result normal?

    YES>>

    Perform the trouble diagnosis for ignition power supply circuit.

    NO>>

    Repair or replace error-detected parts.

  6. CHECK TERMINAL 
    1. Check the power steering control module pin terminals for damage or loose connection with harness connector.
    2. Check the fuse block (J/B) pin terminals for damage or loose connection with harness connector.

    Is the inspection result normal?

    YES>>

    Power steering control module is malfunctioning. Replace steering gear assembly. Refer to STEERING GEAR AND LINKAGE : Removal and Installation .

    NO>>

    Repair or replace error-detected parts.

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