Circuit Description
The PCM applies battery voltage through a pull up resistor to the Engine Oil Pressure Switch circuit. The PCM monitors the applied voltage on the Engine Oil Pressure Switch circuit. If the ignition switch is turned On with the engine not running or engine oil pressure is below 35 kPa (5 psi), the Engine Oil Pressure switch grounds the PCM voltage input. The PCM sends the engine oil pressure information via Class 2 serial data to the Instrument Panel Cluster (IPC). The IPC controls the Engine Oil Pressure Indicator.
Diagnostic Aids
Use the Connector Test Adapter Kit J 35616 for any test that requires probing the PCM harness connectors, electrical center fuse/relay cavities, component terminals or a component harness connector. Using this kit will prevent damage caused by improper probing of connector terminals.
If the problem is intermittent, refer to Intermittent Conditions for diagnosis.
Check for the following condition(s):
| • | Poor connections. Inspect PCM and harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection. |
| • | Damaged harness. Inspect the wiring harness for damage. If the harness appears to be OK, disconnect the Engine Oil Pressure switch, turn the ignition on and observe a voltmeter connected between the Engine Oil Pressure switch connector terminals while moving wiring harnesses related to the Engine Oil Pressure Switch circuit. A change in voltage will indicate the location of the fault. |
Step | Action | Value(s) | Yes | No | ||||
|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | ||||||
2 | Turn the key to On with the engine Off. Does the scan tool indicate Engine Oil Pressure Low? | -- | ||||||
3 | Start the engine. Does the scan tool indicate Engine Oil Pressure OK? | -- | Refer to Diagnostic Aids. | |||||
4 |
Is the correct engine oil level indicated? | -- | ||||||
5 | Check the actual engine oil pressure with a pressure gauge. Refer to Oil Pressure Diagnosis and Testing . Is proper engine oil pressure indicated? | -- | ||||||
6 |
Does the scan tool indicate Engine Oil Pressure OK? | -- | ||||||
7 |
Does the scan tool indicate Engine Oil Pressure Low? | -- | ||||||
8 | Jumper terminal A in the engine oil pressure switch connector to a known good ground. Does the scan tool indicate Engine Oil Pressure Low? | -- | ||||||
9 | Check for a short to ground in the PCM feed to the engine oil pressure switch Was a problem found and corrected? | -- | ||||||
10 | Repair the open engine oil pressure switch ground circuit. Is the action complete? | -- | -- | |||||
11 | Determine the cause of low oil level. Refer to Oil Leak Diagnosis or Oil Consumption Diagnosis for diagnosis. Is the action complete? | -- | -- | |||||
12 | Determine the cause of low oil pressure. Refer to Oil Pressure Diagnosis and Testing for diagnosis. Is the action complete? | -- | -- | |||||
13 | Check for the following conditions:
Was a problem found and corrected? | -- | ||||||
14 | Replace the Engine Oil Pressure switch. Is the action complete? | -- | -- | |||||
15 | Replace the PCM. Refer to Powertrain Control Module Replacement/Programming . Is the action complete? | -- | -- | |||||
16 |
Does the scan tool indicate Engine Oil Pressure Low with the key On/engine Off and then OK with the engine running? | -- | System OK |
