Engine Oil Pressure Signal Inspection

WARNING: This page is about a different car, the 2006 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

CHECK OIL PRESSURE SENSOR SIGNAL

Turn ignition switch ON.

Check voltage between combination meter harness connector M24 terminal 20 and ground.

VOLTAGE TERMINAL REFERENCE

Terminals			Condition	Voltage (V)
(+)		(-)
Connector	Terminal	(-)
M24	20	Ground	When ignition switch is in ON position. (Engine stopped)	Yes
M24	20	Ground	Engine running. (Idle speed)	Yes

Fig 1: Identifying Voltage Between Combination Meter Harness Connector M24 Terminal 20 And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK : GO TO 2.
NG : GO TO 3.

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 and oil pressure sensor harness connector F4 terminal 3.
  Continuity should exist.
  
  Fig 2: Identifying Continuity Between Combination Meter Terminal 16 And Oil Pressure Sensor Terminal 3
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK : Replace the combination meter. Refer to "COMBINATION METER ".
2. NG : Repair harness or connector.
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 and ground.
  Voltage : Approx. 5V
  
  Fig 3: Identifying Voltage Between Combination Meter Harness Connector M24 Terminal 22 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK : GO TO 4.
2. NG : Replace the combination meter. Refer to "COMBINATION METER ".
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 and oil pressure sensor harness connector F4 terminal 1.
  Continuity should exist.
4. Check continuity between combination meter harness connector M24 terminal 22 and ground.
  Continuity should not exist.
  
  Fig 4: Identifying Continuity Between Combination Meter Harness Connector M24 Terminal 22 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK : GO TO 5.
2. NG : Repair harness or connector.
CHECK OIL PRESSURE SENSOR SIGNAL CIRCUIT
1. Check continuity between combination meter harness connector M24 terminal 20 and oil pressure sensor harness connector F4 terminal 2.
  Continuity should exist.
2. Check continuity between combination meter harness connector M24 terminal 20 and ground.
  Continuity should not exist.
  
  Fig 5: Identifying Continuity Between Combination Meter Harness Connector M24 Terminal 20 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK : GO TO 6.
2. NG : Repair harness or connector.
CHECK OIL PRESSURE SENSOR GROUND CIRCUIT
Check continuity between combination meter harness connector M24 terminal 16 and ground.

Continuity should not exist.

Fig 6: Identifying Continuity Between Combination Meter Harness Connector M24 Terminal 16 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK : Replace oil pressure sensor.
2. NG : Repair harness or connector.