Circuit Description
The IPC monitors the ignition 0 voltage circuit, the ignition 1 voltage circuit, and the crank voltage circuit. The ignition 0 voltage circuit is active (circuit is high) when the ignition switch is in accessory, on, or start. The ignition 1 circuit is active (circuit is high) when the ignition switch is in on or start. The crank voltage circuit is active (circuit is high) when the ignition switch is in start.
Conditions for Running the DTC
The ignition is on or in the crank position.
Conditions for Setting the DTC
| • | The IPC detects that the ignition 1 voltage circuit is active and the ignition 0 circuit is inactive. |
| • | The IPC detects that the crank voltage circuit is active and the ignition 0 voltage circuit is inactive. |
| • | The IPC detects that the crank voltage circuit is active and the ignition 1 voltage circuit is inactive. |
| • | One of the above conditions is present for greater than 0.3 seconds. |
Action Taken When the DTC Sets
The IPC illuminates the SERVICE VEHICLE SOON indicator.
Conditions for Clearing the DTC
| • | The current DTC clears when the conditions for setting the DTC are no longer present. |
| • | The history DTC clears after 100 malfunction free ignition cycles. |
| • | The IPC receives a clear code command from the scan tool. |
Diagnostic Aids
| • | Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems. |
| • | The table below shows the ignition switch positions and the corresponding states of the circuits. |
Ignition Switch Position | Ignition 0 Voltage Circuit | Ignition 1 Voltage Circuit | Crank Voltage Circuit |
|---|---|---|---|
Off/Lock | Inactive | Inactive | Inactive |
Accessory | Active | Inactive | Inactive |
On | Active | Active | Inactive |
Start | Active | Active | Active |
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
-
Test the entire ignition voltage circuit, which includes the ignition switch and the fuses.
-
Test the entire crank voltage circuit, which includes the ignition switch and the fuse.
-
Test the entire ignition 1 voltage circuit, which includes the ignition switch and the fuse.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Instrument Cluster: Analog Schematics | ||||
1 | Did you perform the Instrument Cluster Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Does the scan tool display Active for both parameters? | -- | Go to Step 3 | Go to Step 5 |
3 |
Does the scan tool display Inactive? | -- | Go to Step 4 | Go to Step 6 |
4 |
Does the scan tool display Inactive? | -- | Go to Intermittents and Poor Connections Diagnosis in Wiring Systems | Go to Step 7 |
Test the inactive ignition voltage circuit for an open, a high resistance, or a short to ground. Refer to General Electrical Diagnosis and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 8 | |
Test the crank voltage circuit of the IPC for a short to voltage. Refer to Testing for a Short to Voltage and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 8 | |
Test the ignition 1 voltage circuit for a short to voltage. Refer to Testing for a Short to Voltage and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 8 | |
8 | Inspect for poor connections at the harness connector of the IPC. Refer to Intermittents and Poor Connections Diagnosis and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 9 |
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 |
