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Oil Pressure Warning Lamp Stays Off (Ignition Switch ON)

WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK OIL PRESSURE SENSOR SIGNAL 
    1. Turn ignition switch ON.
    2. Check voltage between combination meter harness connector M24 terminal 20 (Y) and ground.
      Fig 1: Combination Meter Harness Connector M24 Terminal 20 (Y) And Ground Voltage Specification Chart
      G02385830Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 2: Checking Voltage Between Combination Meter Harness Connector M24 Terminal 20 (Y) And Ground
      G02385831Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: GO TO 2.
    • NG: GO TO 3.
  2. CHECK OIL PRESSURE SENSOR GROUND CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect combination meter connector M24 and oil pressure sensor connector F4.
    3. Check continuity between combination meter harness connector M24 terminal 16 (B/P) and oil pressure sensor harness connector F4 terminal 3 (B/P).
      • Continuity should exist. 
      Fig 3: Checking Continuity Between Combination Meter Harness Connector M24 Terminal 16 And Oil Pressure Sensor Harness Connector F4 Terminal 3
      G02385832Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: Replace the combination meter. Refer to "COMBINATION METER ".
    • NG: Repair harness or connector.
  3. CHECK OIL PRESSURE SENSOR REFERENCE VOLTAGE 
    1. Turn ignition switch OFF.
    2. Disconnect oil pressure sensor connector F4.
    3. Turn ignition switch ON.
    4. Check voltage between combination meter harness connector M24 terminal 22 (GR/L) and ground.
      • Voltage: Approx. 5V 
      Fig 4: Checking Voltage Between Combination Meter Harness Connector M24 Terminal 22 (GR/L) And Ground
      G02385833Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

  4. CHECK OIL PRESSURE SENSOR POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect combination meter connector M24.
    3. Check continuity between combination meter harness connector M24 terminal 22 (GR/L) and oil pressure sensor harness connector F4 terminal 1 (GR/L).
      • Continuity should exist. 
    4. Check continuity between combination meter harness connector M24 terminal 22 (GR/L) and ground.
      • Continuity should not exist. 

    OK or NG

    • OK: GO TO 5.
    • NG: Repair harness or connector.
    Fig 5: Checking Continuity Between Combination Meter Harness Connector M24 Terminal 22, Oil Pressure Sensor Harness Connector F4 Terminal 1 And Ground
    G02385834Courtesy of NISSAN MOTOR CO., U.S.A.
  5. CHECK OIL PRESSURE SENSOR SIGNAL CIRCUIT 
    1. Check continuity between combination meter harness connector M24 terminal 20 (Y) and oil pressure sensor harness connector F4 terminal 2 (Y).
      • Continuity should exist. 
    2. Check continuity between combination meter harness connector M24 terminal 20 (Y) and ground.
      • Continuity should not exist. 

    OK or NG

    • OK: GO TO 6.
    • NG: Repair harness or connector.
    Fig 6: Checking Continuity Between Combination Meter Harness Connector M24 Terminal 20, Oil Pressure Sensor Harness Connector F4 Terminal 2 And Ground
    G02385835Courtesy of NISSAN MOTOR CO., U.S.A.
  6. CHECK OIL PRESSURE SENSOR GROUND CIRCUIT 

    Check continuity between combination meter harness connector M24 terminal 16 (B/P) and ground.

    • Continuity should not exist. 

    OK or NG

    • OK: Replace oil pressure sensor.
    • NG: Repair harness or connector.
    Fig 7: Checking Continuity Between Combination Meter Harness Connector M24 Terminal 16 (B/P) And Ground
    G02385836Courtesy of NISSAN MOTOR CO., U.S.A.
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