Pinpoint Test D: Incorrect Oil Pressure Gauge Indication

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

D1 RETRIEVE THE RECORDED INSTRUMENT CLUSTER DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND SELF-TESTS
- Check for recorded instrument cluster DTCs from the continuous and on-demand self-tests.
- Is DTC C1284 recorded?
- Yes : GO to D3.
- No : GO to D2.
D2 CARRY OUT THE INSTRUMENT CLUSTER OIL PRESSURE GAUGE ACTIVE COMMAND USING THE DIAGNOSTIC TOOL
- Key in ON position.
- Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster Active Command.
- Select the instrument cluster oil pressure gauge active command. Trigger the oil pressure gauge active command on and off.
- Did the engine oil pressure gauge read mid-range when triggered on and L (low) when triggered off?
- Yes : GO to D5.
- No : GO to D8.
D3 CHECK CIRCUIT 1308 (BN/OG) FOR A SHORT TO GROUND
- Key in OFF position.
- Disconnect: Instrument Cluster C220b.
- Disconnect: Engine Oil Pressure Switch C103.
- Measure the resistance between the instrument cluster C220b-15, circuit 1308 (BN/OG), harness side and ground.
  
  Fig 1: Checking Circuit 1308 (BN/OG) For Short To Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
- Yes : GO to D4.
- No : REPAIR the circuit. TEST the system for normal operation.
D4 CHECK THE ENGINE OIL PRESSURE SWITCH
- Connect: Instrument Cluster C220b.
- Key in ON position.
- Observe the engine oil pressure gauge.
- Does the engine oil pressure gauge indicate normal oil pressure?
- Yes : GO to D8.
- No : INSTALL a new engine oil pressure switch. TEST the system for normal operation.
D5 CHECK THE OIL PRESSURE
- Carry out the engine oil pressure test. Refer to ENGINE SYSTEM-GENERAL INFORMATION .
- Is the oil pressure within specification?
- Yes : GO to D6.
- No : REFER to ENGINE SYSTEM-GENERAL INFORMATION to continue diagnosis of the engine oil pressure.
D6 CHECK THE ENGINE OIL PRESSURE SWITCH
- Key in OFF position.
- Disconnect: Engine Oil Pressure Switch C103.
- Connect a fused (5A) jumper wire between the engine oil pressure switch C103, circuit 1308 (BN/OG), harness side and ground.
  
  Fig 2: Connecting Fused Jumper Wire Between Connector And Ground
  Courtesy of FORD MOTOR CO.
- Does the engine oil pressure gauge indicate normal oil pressure?
- Yes : INSTALL a new engine oil pressure switch. CLEAR the DTCs. REPEAT the self-test.
- No : REMOVE the jumper wire. GO to D7.
D7 CHECK CIRCUIT 1308 (BN/OG) FOR AN OPEN
- Key in OFF position.
- Disconnect: Instrument Cluster C220b.
- Measure the resistance between the instrument cluster C220b-15, circuit 1308 (BN/OG), harness side and the engine oil pressure switch C103, circuit 1308 (BN/OG), harness side.
  
  Fig 3: Checking Circuit 1308 (BN/OG) For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to D8.
- No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
D8 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
- Disconnect all the instrument cluster connectors.
- Check for:
  - corrosion
  - pushed-out pins
- Connect all the instrument cluster connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes : INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER . TEST the system for normal operation.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. TEST the system for normal operation.