Oil Pressure Warning Lamp Does Not Turn Off (Oil Pressure Is Normal)

WARNING: This page is about a different car, the 2003 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: For oil pressure inspection, Refer to , "OIL PRESSURE CHECK " (QR25DE) or "OIL PRESSURE CHECK " (VQ35DE).

HARNESS CONTINUITY INSPECTION
1. Disconnect IPDM E/R connector and oil pressure switch connector.
2. Check continuity between IPDM E/R harness connector E121 terminal 50 (P/L) and ground.
  
  Fig 1: Terminal And Continuity
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 2: Checking Continuity Between IPDM E/R Harness Connector E121 Terminal 50 (P/L) And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 2.
2. NG: Repair harness or connector.
IPDM E/R VOLTAGE INSPECTION
1. Connect IPDM E/R connector.
2. Turn the ignition switch ON.
3. Check voltage between IPDM E/R harness connector E121 terminal 50 (P/L) and body ground.
  
  Fig 3: Terminal And Voltage
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 4: Checking Voltage Between IPDM E/R Harness Connector E121 Terminal 50 (P/L) And Body Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: Check oil pressure switch. Refer to , "OIL PRESSURE SWITCH ".
2. NG: Replace IPDM E/R.