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Engine Oil Pressure Gage Inaccurate or Inoperative

Engine Oil Pressure Gage Inaccurate or Inoperative

Step Action Values Yes No
Schematic Reference: Instrument Cluster Schematics 
Connector End View Reference: Master Electrical Component List in Wiring Systems
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2 Start the engine.
Does the engine oil pressure (EOP) gage display within the specified range?		 34-483 kPa (5-70 psi) - 8.1L only
207-483 kPa (30-70 psi)		 Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, perform the Displays Test in the instrument panel cluster (IPC) Scan Tool Output Controls.
Does the engine oil pressure gage move up and down when commanded?		 - Go to Step 4  Go to Step 15 
4
  1. Turn the ignition OFF.
  2. Disconnect the EOP sensor.
  3. Connect a 3-ampere fused jumper between the EOP sensor signal circuit and the 5-volt reference circuit of the EOP sensor.
  4. With the scan tool, observe one of the following engine oil pressure parameters:
    • Monitored Oil Pressure parameter in the IPC Data 1 data list - 6.6L diesel only.
    • Engine Oil Pressure Sensor parameter in the powertrain control module (PCM) Engine Data 2 data list - All engines except 6.6L diesel.
Does the scan tool indicate that the Engine Oil Pressure parameter is at or greater than the specified value?		 550 kPa (80 psi) - 6.6L diesel only
4.6 V - All engines except 6.6L diesel		 Go to Step 5  Go to Step 6 
5
  1. Connect a 3-ampere fused jumper between the EOP sensor signal circuit and the low reference circuit of the EOP sensor.
  2. With the scan tool, observe one of the following engine oil pressure parameters:
    • Monitored Oil Pressure parameter in the IPC Data 1 data list - 6.6L diesel only.
    • Engine Oil Pressure Sensor parameter in the PCM Engine Data 2 data list - All engines except 6.6L diesel.
Does the scan tool indicate that the Engine Oil Pressure parameter is at or less than the specified value?		 0 kPa (0 psi) - 6.6L diesel only
0.4 V - All engines except 6.6L diesel		 Go to Step 11  Go to Step 7 
6
  1. Disconnect the fused jumper.
  2. Measure the voltage between the 5-volt reference circuit of the EOP sensor and the low reference circuit of the EOP sensor.
Does the voltage measure greater than the specified value?		 4.6 V Go to Step 10  Go to Step 8 
7
  1. Disconnect the negative battery cable.
  2. Measure the resistance from the low reference circuit of the EOP sensor to a good ground.
Does the resistance measure less than the specified value?		 5 Ω Go to Step 12  Go to Step 9 
8 Test the EOP 5-volt reference circuit for the following:
  • An open
  • A short to ground
  • A high resistance

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 16  Go to Step 9 
9 Test the EOP low reference circuit for high resistance or for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 16  Go to Step 10 
10 Test the EOP oil pressure sensor signal circuit for the following:
  • An open
  • A short to ground
  • A high resistance

Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 16  Go to Step 12 
11 Inspect for poor connections at the harness connector of the EOP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 16  Go to Step 13 
12 Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 16  Go to Step 14 
13 Replace the engine oil pressure sensor. Refer to the following procedures:
Did you complete the replacement?		 - Go to Step 16  -
14 Replace the PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 16  -
15 Replace the IPC. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 16  -
16 Operate the system in order to verify the repair.
Did you correct the condition?		 - System OK Go to Step 2 
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