Oil Pressure Warning Lamp Stays Off (Ignition Switch ON)

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.

INSPECTION 1 BETWEEN IPDM E/R AND COMBINATION METER
1. Activate IPDM E/R auto active test. Refer to , "AUTO ACTIVE TEST ".
Does auto active test activate?
1. Yes: Replace combination meter.
2. No: GO TO 2.
CHECK OIL PRESSURE SWITCH CIRCUIT
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 oil pressure switch connector terminal + (P/L).
  
  Fig 1: Terminal And Continuity
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 2: Check Continuity Between IPDM E/R Harness Connector And Oil Pressure Switch Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 3.
2. NG: Repair harness or connector.
CHECK OIL PRESSURE SWITCH
1. Check oil pressure switch. Refer to , "OIL PRESSURE SWITCH "
OK or NG
1. OK: GO TO 4.
2. NG: Replace the oil pressure switch.
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: Perform BCM self-diagnosis.
2. NG: Replace IPDM E/R.