Engine Oil Pressure Switch Diagnosis
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 II serial data to the Instrument Panel Cluster (IPC). The IPC controls the Engine Oil Pressure Indicator.
Diagnostic Aids
Check for the following condition(s):
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.
| • | Poor terminal connection. |
| Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and faulty terminal to wire connection. Use a corresponding mating terminal to test for proper tension. Refer to Intermittents and Poor Connections Diagnosis , and Connector Repairs Wiring Systems. |
| • | Damaged harness. |
| Inspect the wiring harness for damage. If the harness appears to be OK, observe the sensor display on the scan tool while moving connectors and wiring harnesses related to the sensor. A change in the sensor display may indicate the location of the fault. Refer to Wiring Repairs in Wiring Systems. |
| • | Inspect the PCM and the engine grounds for clean and secure connections. |
If the DTC is determined to be intermittent, reviewing the Fail Records can be useful in determining when the DTC was last set.
Engine Oil Pressure Switch Diagnosis
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Powertrain on-Board Diagnostic (OBD) System Test performed? | -- | ||
2 | Are any PCM DTCs stored? | -- | Go to Applicable DTCs | |
3 | Is the Engine Oil pressure Indicator on? | -- | ||
4 | Test the engine for correct oil level. Is the correct engine oil level indicated? | -- | ||
5 | Test the engine oil pressure with a manual pressure gauge. Refer to Oil Pressure Diagnosis and Testing . Is proper engine oil pressure indicated? | -- | ||
6 |
Is the J 35616-200 test lamp on? | -- | ||
7 |
Is the J 35616-200 test lamp on? | -- | ||
8 |
Was a problem found? | -- | ||
9 |
Was a problem found? | -- | ||
10 | Locate and repair the following circuit condition(s):
Is the action complete? | -- | -- | |
11 | Determine cause of low oil. Is the action complete? | -- | -- | |
12 | Determine cause of low oil pressure. Refer to Oil Pressure Diagnosis and Testing . Is the action complete? | -- | -- | |
13 | Test the Communication circuit for correct operation. Refer to Wiring Repairs . Was a problem found? | -- | ||
14 | Replace Engine Oil Pressure switch. Refer to Engine Oil Pressure 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 | Test for the proper operation of Oil Pressure Switch. Refer to Oil Pressure Diagnosis and Testing . Is the correct operation indicated? | -- | System Ok |
