Circuit Description
The powertrain control module (PCM) applies battery voltage through a pull up resistor to the engine oil pressure (EOP) switch circuit. The PCM monitors the applied voltage on the EOP 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
Inspect for the following conditions:
Many situations may lead to an intermittent condition. Perform each inspection or test as directed.
Important: : Remove any debris from the connector surfaces before servicing a component. Inspect the connector gaskets when diagnosing or replacing a component. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion.
| • | Loose terminal connection |
| - | Use a corresponding mating terminal to test for proper tension. Refer to Testing for Intermittent Conditions and Poor Connections , and to Connector Repairs in Wiring Systems for diagnosis and repair. |
| - | Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and faulty terminal to wire connection. Refer to Testing for Intermittent Conditions and Poor Connections , and to Connector Repairs in Wiring Systems for diagnosis and repair. |
| • | Damaged harness--Inspect the wiring harness for damage. If the harness inspection does not reveal a problem, observe the display on the scan tool while moving connectors and wiring harnesses related to the sensor. A change in the scan tool display may indicate the location of the fault. Refer to Wiring Repairs in Wiring Systems for diagnosis and repair. |
| • | Inspect the powertrain control module (PCM) and the engine grounds for clean and secure connections. Refer to Wiring Repairs in Wiring Systems for diagnosis and repair. |
If the condition is determined to be intermittent, reviewing the Snapshot or Freeze Frame/Failure Records may be useful in determining when the DTC or condition was identified.
Step | Action | Values | Yes | No | ||||
|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Powertrain On Board Diagnostic (OBD) System Check? | -- | ||||||
2 | Are any PCM DTCs stored? | -- | ||||||
3 | Is the engine oil pressure indicator ON? | -- | ||||||
4 | Check the engine for correct oil level. Is the correct engine oil level indicated? | -- | ||||||
5 | Check the engine oil pressure with a manual pressure gauge. Refer to Oil Pressure Diagnosis and Testing in Engine Mechanical. Is proper engine oil pressure indicated? | -- | ||||||
6 |
Does the test lamp illuminate? | -- | ||||||
7 |
Does the test lamp illuminate? | -- | ||||||
8 |
Did you find and correct the condition? | -- | ||||||
9 | Check for the following circuit conditions:
If a problem is found, repair as necessary. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||||||
10 | Locate and repair the following circuit conditions:
Is the action complete? | -- | -- | |||||
11 | Determine cause of low oil. Is the action complete? | -- | -- | |||||
12 | Determine cause of low oil pressure. Is the action complete? | -- | -- | |||||
13 | Check the Communication circuit for correct operation. Refer to Diagnostic Starting Point . Did you find and correct the condition? | -- | ||||||
14 | Replace Engine Oil Pressure switch. Refer to Engine Oil Level Sensor and/or Switch Replacement . Is the action complete? | -- | -- | |||||
15 |
Important: The replacement PCM must be programmed. Replace the PCM. Refer to Powertrain Control Module Replacement/Programming . Is the action complete? | -- | -- | |||||
16 | Check for the proper operation of oil pressure indicator. Refer to Diagnostic System Check - Instrument Cluster in Instrument Panel, Gauges and Console. Is the correct operation indicated? | -- | System OK |
