Engine Oil Pressure Gauge Inaccurate or Inoperative

Step / Action / Value(s) / Yes / No
Schematic Reference:
Connector End View Reference:
1 / Did you perform the Instrument Cluster Diagnostic System Check? / -- / Go to Step2 / Go to Diagnostic System Check - Instrument Cluster
2 / Start the engine.
Does the engine oil pressure (EOP) gauge display within the specified range? / 34-483kPa (5-70psi) - L18 only
207-483kPa (30-70psi) / Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems / Go to Step3
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 gauge move up and down when commanded? / -- / Go to Step4 / Go to Step15
4 /
  1. Turn the ignition OFF.
  2. Disconnect the engine oil pressure (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 list (LLY and LG4 only).
• / Engine Oil Pressure Sensor parameter in the PCM Engine Data2 data list (L18 only).
Does the scan tool indicate that the Engine Oil Pressure parameter is at or greater than the specified value? / 550kPa (80psi)-LLY and LG4 only
4.6V-L18 only / Go to Step5 / Go to Step6
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 list (LLY and LG4 only).
• / Engine Oil Pressure Sensor parameter in the PCM Engine Data2 data list (L18 only).
Does the scan tool indicate that the Engine Oil Pressure parameter is at or less than the specified value? / 0kPa (0psi)-LLY and LG4 only
0.4V-L18 only / Go to Step11 / Go to Step7
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? / 4.6V / Go to Step10 / Go to Step8
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? / 5Ω / Go to Step12 / Go to Step9
8 / Test the EOP 5 volt reference circuit for a for an open, for a short to ground, or for a high resistance.
Did you find and correct the condition? / -- / Go to Step16 / Go to Step9
9 / Test the EOP low reference circuit for high resistance or for an open.
Did you find and correct the condition? / -- / Go to Step16 / Go to Step10
10 / Test the EOP oil pressure sensor signal circuit for a for an open, for a short to ground, or for a high resistance.
Did you find and correct the condition? / -- / Go to Step16 / Go to Step12
11 / Inspect for poor connections at the harness connector of the EOP sensor.
Did you find and correct the condition? / -- / Go to Step16 / Go to Step13
12 / Inspect for poor connections at the harness connector of the PCM.
Did you find and correct the condition? / -- / Go to Step16 / Go to Step14
13 / Replace the engine oil pressure sensor. Refer to the following procedures: Did you complete the replacement? / -- / Go to Step16 / --
14 / Important:Program the replacement PCM.
Replace the PCM. Refer to the following procedures: Did you complete the replacement? / -- / Go to Step16 / --
15 / Replace the IPC.
Did you complete the replacement? / -- / Go to Step16 / --
16 / Operate the system in order to verify the repair.
Did you correct the condition? / -- / System OK / Go to Step2