Circuit Description
The instrument panel cluster (IPC) will have high resistance with low engine oil temperature, and low resistance with high engine oil temperature. The IPC supplies a 5 volt reference signal to the oil temperature sensor. When the engine oil is cold, the sensor resistance will decrease, and the IPC reference voltage level will drop. The IPC measures the reference voltage change and displays the calculated value on the gage.
Conditions for Setting the DTC
| • | The IPC detects that the oil temperature is less than -10°C (14°F) |
| • | The engine must be running for longer than 5 minutes for this DTC to set. |
Action Taken When the DTC Sets
| • | The IPC stores DTC B1543. |
| • | The IPC displays oil temperature as LOW. |
Conditions for Clearing the DTC
| • | The IPC detects that the oil temperature is above -10°C (14°F). |
| • | A history DTC will clear after 50 consecutive ignition cycles if the condition for the malfunction is no longer present. |
| • | The code is cleared using on-board diagnostics. |
| • | The IPC receives a clear code command from the scan tool. |
Diagnostic Aids
| • | The following conditions may cause an intermittent malfunction to occur: |
| - | An intermittent open or high resistance in the oil temperature sensor circuit. |
| - | An internal open in the oil temperature sensor. |
| • | For intermittents and poor connections refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. |
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Instrument Cluster Schematics | ||||
1 | Did you perform the IPC Diagnostic System Check? | -- | Go to Step 2 | |
Does the scan tool indicate that the Oil Temp parameter is within the specified range? | -10 to +190°C (14-374°F) | Go to Diagnostic Aids | Go to Step 3 | |
3 |
Does the scan tool indicate that the Oil Temp parameter is greater than the specified value? | 190°C (374°F) | Go to Step 6 | Go to Step 4 |
4 | Test the signal circuit of the oil temperature sensor for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 5 |
5 | Test the ground circuit of the oil temperature sensor for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 7 |
6 | Inspect for poor connections at the harness connector of the oil temperature sensor. Refer to Testing for Intermittent Conditions and Poor Connections and 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 IPC. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 9 |
8 | Replace the oil temperature sensor. Refer to Engine Oil Temperature Gage Sensor Replacement . Did you complete the replacement? | -- | Go to Step 10 | -- |
9 | Replace the IPC. Refer to Instrument Cluster Replacement . Did you complete the replacement? | -- | Go to Step 10 | -- |
10 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
