Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC P0381 01: Wait to Start Indicator Control Circuit Shorted to VoltageDTC P0381 02: Wait to Start Indicator Control Circuit Shorted to Ground
DTC P0381 04: Wait to Start Indicator Control Circuit Open
DTC P0381 54: Wait to Start Indicator Control Circuit High Temperature
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Wait Lamp Voltage Supply | P0381 | P0381 | -- | -- |
Wait Lamp Control | P0381 | P0381 | P0381 | -- |
Circuit/System Description
The wait to start indicator, or glow plug indicator, is located on the instrument panel cluster (IPC). Ignition 1 voltage is supplied directly to the wait to start indicator. The engine control module (ECM) turns the wait to start indicator ON by grounding the wait to start indicator control circuit.
Conditions for Running the DTC
| • | The engine is operating. |
| • | The ignition 1 voltage is between 7.5-16 volts. |
| • | The DTCs run continuously once the above conditions are met. |
Conditions for Setting the DTC
The ECM detects the wait to start indicator control circuit is open or shorted to ground or voltage.
Action Taken When the DTC Sets
DTC P0381 is a Type C DTC.
Conditions for Clearing the DTC
DTC P0381 is a Type C DTC.
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Engine idling, command the glow plug indicator ON and OFF with a scan tool. The indicator should turn ON and OFF.
- Observe the DTC information with a scan tool. DTC P0381 should not set.
- Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
- If any other indicators are inoperative on the P16 instrument panel cluster (IPC), refer to Symptoms - Displays and Gages.
- Ignition OFF, disconnect the harness connector X2 at the K20 ECM.
- Ignition ON, the wait to start indicator should not illuminate.
- Ignition ON, connect a 3 A fused jumper wire between the wait to start indicator control circuit terminal X2-92 and ground. The wait to start indicator should illuminate.
| ⇒ | If the wait to start indicator illuminates, test the control circuit for a short to ground. If the circuit test normal, replace the P16 IPC. |
| ⇒ | If the wait to start indicator does not illuminate, test the control circuit for a short to voltage or an open/high resistance. If the circuit test normal, replace the P16 IPC. |
| ⇒ | If the wait to start indicator illuminates, inspect for a poor connection or replace the K20 ECM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
