Circuit Description
With low oil pressure, the engine oil pressure switch closes, and the signal circuit is low. With oil pressure above 4.5 psi, the engine oil pressure switch opens, and the signal circuit is high. The powertrain control module (PCM) monitors the oil pressure switch signal circuit and sends a class 2 message to the body control module (BCM) indicating the switch status. The BCM sends a message via the serial peripheral interface (SPI) to the IPC in order to illuminate the low oil pressure indicator.
Conditions for Running the DTC
| • | DTC P0117 is not set |
| • | DTC P0118 is not set |
| • | DTC P1111 is not set |
| • | DTC P1114 is not set |
| • | The ignition is ON with the engine OFF |
| • | The engine temperature is 10°C (50°F) less than the last key off temperature |
Conditions for Setting the DTC
| • | The PCM detects that the oil pressure switch signal circuit is high. |
| • | The above condition is present for greater than 10 seconds. |
Action Taken When the DTC Sets
The PCM stores the conditions that are present when the DTC sets. The information is stored as Failure Records data only. This information is not stored as Freeze Frame data.
Conditions for Clearing the DTC
| • | The DTC becomes history when then conditions for setting the DTC are no longer present. |
| • | The history DTC is cleared after 40 malfunction free warm-up cycles. |
| • | The PCM receives the clear code command from the scan tool. |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Instrument Cluster Schematics | |||
1 | Did you perform the Instrument Cluster Diagnostic System Check? | Go to Step 2 | |
2 |
Does the Oil Pressure Switch parameter display Low? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Does the Oil Pressure Switch parameter display Low? | Go to Step 5 | Go to Step 4 |
4 | Test the signal circuit of the engine oil pressure switch for an open, for a high resistance, or for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 7 |
5 | Test the ground circuit of the engine oil pressure switch for an open or for a high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 6 |
6 | Inspect for poor connections at the harness connector of the engine oil pressure switch. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 8 |
7 | Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 9 |
8 | Replace the engine oil pressure switch. Refer to Engine Oil Pressure Sensor and/or Switch Replacement in Engine Mechanical. Did you complete the replacement? | Go to Step 10 | -- |
9 |
Important: Program the replacement PCM. Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls. Did you complete the replacement? | Go to Step 10 | -- |
10 |
Does the DTC reset? | Go to Step 2 | System OK |
