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Home >> Infiniti >> 2017 >> QX80 Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (3 Of 4) >> DTC/Circuit Diagnosis >> DTC P0550: PSP Sensor >> Diagnosis Procedure >> Diagnostic Test
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Diagnostic Test

  1. CHECK POWER STEERING PRESSURE SENSOR POWER SUPPLY CIRCUIT-I

    1. Turn ignition switch OFF.
    2. Disconnect power steering pressure (PSP) sensor harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between PSP sensor harness connector terminals.
      PSP sensor Voltage
      (Approx.)
      Connector + -
      terminal
      F35 1 3 5 V

    Is the inspection result normal?

    YES 

    GO TO STEP  6.

    NO 

    GO TO STEP 2  .

  2. CHECK POWER STEERING PRESSURE SENSOR POWER SUPPLY CIRCUIT-II

    1. Check the voltage between PSP sensor harness connector and the ground.
      + - Voltage
      (Approx.)
      PSP sensor
      Connector terminal
      F35 1 Ground 5 V

    Is inspection result normal?

    YES 

    GO TO STEP 4  .

    NO 

    GO TO STEP 3  .

  3. CHECK SENSOR POWER SUPPLY 3 CIRCUIT

    Perform DIAGNOSIS PROCEDURE .

    Is inspection result normal?

    YES 

    Perform the trouble diagnosis for power supply circuit. Refer to DIAGNOSIS PROCEDURE .

    NO 

    Repair or replace error-detected parts.

  4. CHECK PSP SENSOR GROUND CIRCUIT

    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between PSP sensor harness connector and ECM harness connector.
      + - Continuity
      PSP sensor ECM
      Connector Terminal Connector Terminal
      F35 3 F91 13 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    Repair or replace error-detected parts.

  5. CHECK ECM GROUND CIRCUIT

    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between ECM harness connector and the ground.
      + - Continuity
      ECM
      Connector Terminal
      E20 147 Ground Existed
      149
      152

    Is inspection result normal?

    YES 

    Check intermittent incident. Refer to INTERMITTENT INCIDENT .

    NO 

    Repair or replace error-detected parts.

  6. CHECK PSP SENSOR SIGNAL CIRCUIT

    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between PSP sensor harness connector and ECM harness connector.
      + - Continuity
      PSP sensor ECM
      Connector Terminal Connector Terminal
      F35 2 F91 24 Existed
    4. Also check harness for short to ground and to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 7  .

    NO 

    Repair or replace error-detected parts.

  7. CHECK PSP SENSOR

    Refer to COMPONENT INSPECTION (POWER STEERING PRESSURE SENSOR) .

    Is the inspection result normal?

    YES 

    GO TO STEP 8  .

    NO 

    Replace PSP sensor.

  8. CHECK INTERMITTENT INCIDENT

    Refer to INTERMITTENT INCIDENT .

    INSPECTION END

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