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Home >> Infiniti >> 2024 >> QX55 Essential >> Repair and Diagnosis >> Steering >> Steering Control Systems >> Steering Control System (Direct Adaptive Steering) (DTC/Circuit Diagnosis) (2 Of 2) >> DTC/Circuit Diagnosis >> Power Supply And Ground Circuit >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK STEERING FORCE CONTROL MODULE GROUND CIRCUIT 
      1. Ignition switch OFF.
      2. Disconnect steering force control module connector.
      3. Check the continuity between steering force control module harness connector and ground.
        Steering force control module - Continuity
        Connector Terminal
        E142 34 Ground Yes

    Is the inspection result normal?

    YES>>

    GO TO 2.

    NO>>

    Repair open circuit in harness or connectors.

  2. CHECK STEERING ANGLE MAIN CONTROL MODULE GROUND CIRCUIT 
      1. Disconnect steering angle main control module connector.
      2. Check the continuity between steering angle main control module harness connector and ground.
        Steering angle main control module - Continuity
        Connector Terminal
        E150 34 Ground Yes
        E146 39

    Is the inspection result normal?

    YES>>

    GO TO 3.

    NO>>

    Repair open circuit in harness or connectors.

  3. CHECK STEERING ANGLE SUB CONTROL MODULE GROUND CIRCUIT 
      1. Disconnect steering angle sub control module connector.
      2. Check the continuity between steering angle sub control module harness connector and ground.
        Steering angle sub control module - Continuity
        Connector Terminal
        E145 34 Ground Yes
        E143 39

    Is the inspection result normal?

    YES>>

    GO TO 4.

    NO>>

    Repair open circuit in harness or connectors.

  4. CHECK STEERING FORCE CONTROL MODULE POWER SUPPLY CIRCUIT (1) 
    1. Check the voltage between steering force control module harness connector and ground.
      (+) (-) Voltage(Approx.)
      Steering force control module
      Connector Terminal
      E142 33 Ground Battery Voltage

    Is the inspection result normal?

    YES>>

    GO TO 6.

    NO>>

    GO TO 5.

  5. CHECK STEERING FORCE CONTROL MODULE POWER SUPPLY CIRCUIT (2) 
      1. Check the 60A fusible link (#Q).
      2. Check the harness for open or short between steering force control module harness connector E142 terminal 33 and the 60A fusible link (#Q).

    Is the inspection result normal?

    YES>>

    Perform the trouble diagnosis for battery power supply circuit. Refer to appropriate Wiring Diagram.

    NO>>

    Repair or replace malfunctioning component.

  6. CHECK STEERING ANGLE MAIN CONTROL MODULE POWER SUPPLY CIRCUIT (1) 
    1. Check the voltage between steering angle main control module harness connector and ground.
      (+) (-) Voltage(Approx.)
      Steering angle main control module
      Connector Terminal
      E150 33 Ground Battery Voltage

    Is the inspection result normal?

    YES>>

    GO TO 8.

    NO>>

    GO TO 7.

  7. CHECK STEERING ANGLE MAIN CONTROL MODULE POWER SUPPLY CIRCUIT (2) 
      1. Check the 100A fusible link (#G).
      2. Check the harness for open or short between steering angle main control module harness connector E150 terminal 33 and the 100A fusible link (#G).

    Is the inspection result normal?

    YES>>

    Perform the trouble diagnosis for battery power supply circuit. Refer to appropriate Wiring Diagram.

    NO>>

    Repair or replace malfunctioning component.

  8. CHECK STEERING ANGLE SUB CONTROL MODULE POWER SUPPLY CIRCUIT (1) 
    1. Check the voltage between steering angle sub control module harness connector and ground.
      (+) (-) Voltage(Approx.)
      Steering angle sub control module
      Connector Terminal
      E145 33 Ground Battery Voltage

    Is the inspection result normal?

    YES>>

    GO TO 10.

    NO>>

    GO TO 9.

  9. CHECK STEERING ANGLE SUB CONTROL MODULE POWER SUPPLY CIRCUIT (2) 
      1. Check the 100A fusible link (#Z).
      2. Check the harness for open or short between steering angle sub control module harness connector E145 terminal 33 and the 100A fusible link (#Z).

    Is the inspection result normal?

    YES>>

    Perform the trouble diagnosis for battery power supply circuit. Refer to appropriate Wiring Diagram.

    NO>>

    Repair or replace malfunctioning component.

  10. CHECK IGNITION POWER SUPPLY FOR STEERING ANGLE MAIN CONTROL MODULE 
      1. Connect steering force control module connector and steering angle sub control module connector.
      2. Check the voltage between steering angle main control module harness connector and ground.
        (+) (-) Voltage(Approx.)
        Steering angle main control module
        Connector Terminal
        E149 25 Ground 0 V
      3. Ignition switch ON.
      4. Check the voltage between steering angle control module harness connector and ground.
        (+) (-) Voltage(Approx.)
        Steering angle main control module
        Connector Terminal
        E149 25 Ground Battery Voltage

    Is the inspection result normal?

    YES>>

    Inspection End.

    NO>>

    GO TO 11.

  11. CHECK IGNITION POWER SUPPLY CIRCUIT (1) 
      1. Ignition switch OFF.
      2. Disconnect steering angle sub control module connector.
      3. Check the continuity between steering angle main control module harness connector and steering angle sub control module harness connector.
        Steering angle main control module Steering angle sub control module Continuity
        Connector Terminal Connector Terminal
        E149 25 E144 27 Yes

    Is the inspection result normal?

    YES>>

    GO TO 12.

    NO>>

    Repair or replace malfunctioning component.

  12. CHECK INTERNAL CIRCUIT IN STEERING ANGLE SUB CONTROL MODULE 
    1. Check the continuity between steering angle sub control module connector terminals.
      Steering angle sub control module Continuity
      Terminals
      25 27 Yes

    Is the inspection result normal?

    YES>>

    GO TO 13.

    NO>>

    Replace steering angle sub control module. Refer to Removal and Installation .

  13. CHECK IGNITION POWER SUPPLY FOR STEERING ANGLE SUB CONTROL MODULE 
      1. Check the voltage between steering angle sub control module harness connector and ground.
        (+) (-) Voltage(Approx.)
        Steering angle sub control module
        Connector Terminal
        E144 25 Ground 0 V
      2. Ignition switch ON.
      3. Check the voltage between steering angle control module harness connector and ground.
        (+) (-) Voltage(Approx.)
        Steering angle sub control module
        Connector Terminal
        E144 25 Ground Battery Voltage

    Is the inspection result normal?

    YES>>

    NO>>

    GO TO 14.

  14. CHECK IGNITION POWER SUPPLY CIRCUIT (2) 
      1. Ignition switch OFF.
      2. Disconnect steering force control module connector.
      3. Check the continuity between steering angle sub control module harness connector and steering force control module harness connector.
        Steering angle sub control module Steering force control module Continuity
        Connector Terminal Connector Terminal
        E144 25 E141 27 Yes

    Is the inspection result normal?

    YES>>

    GO TO 15.

    NO>>

    Repair or replace error-detected parts.

  15. CHECK INTERNAL CIRCUIT IN STEERING FORCE CONTROL MODULE 
    1. Check the continuity between steering force control module connector terminals.
      Steering force control module Continuity
      Terminals
      25 27 Yes

    Is the inspection result normal?

    YES>>

    GO TO 16.

    NO>>

    Replace steering force control module. Refer to Removal and Installation .

  16. CHECK IGNITION POWER SUPPLY FOR STEERING FORCE CONTROL MODULE 
      1. Check the voltage between steering force control module harness connector and ground.
        (+) (-) Voltage(Approx.)
        Steering force control module
        Connector Terminal
        E141 25 Ground 0 V
      2. Ignition switch ON.
      3. Check the voltage between steering force control module harness connector and ground.
        (+) (-) Voltage(Approx.)
        Steering force control module
        Connector Terminal
        E141 25 Ground Battery Voltage

    Is the inspection result normal?

    YES>>

    NO>>

    GO TO 17.

  17. CHECK IGNITION POWER SUPPLY CIRCUIT (3) 
      1. Ignition switch OFF.
      2. Check the 10A fuse (#53).
      3. Disconnect fuse block (J/B) connector.
      4. Check the continuity between steering force control module harness connector and fuse block (J/B) harness connector.
        Steering force control module Fuse block (J/B) Continuity
        Connector Terminal Connector Terminal
        E141 25 E28 6P Yes
      5. Check the continuity between steering force control module harness connector and ground.
        Steering force control module - Continuity
        Connector Terminal
        E141 25 Ground No

    Is the inspection result normal?

    YES>>

    Perform the trouble diagnosis for ignition power supply circuit.

    NO>>

    Repair or replace malfunctioning component.

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