• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Voltage Supply | P0381, P0381 02 | P0381, P0381 04 | -- | -- |
Control Circuit | P0381, P0381 02 | P0381, P0381 04 | P0381, P0381 01 | P0381 54 |
The Wait to Start lamp is located on the instrument panel cluster (IPC). The lamp informs the driver when to start the engine. The engine control module (ECM) monitors the lamp control circuit for conditions that are incorrect for the commanded state of the lamp. For example, a failure condition exists if the ECM detects low voltage when the lamp is commanded OFF, or high voltage when the lamp is commanded ON.
• | The ignition is ON. |
• | The ignition voltage is between 8.5-16.5 volts. |
• | DTC P0381 runs continuously once the above conditions are met. |
The ECM detects a short to voltage on the circuit that controls the lamp.
The ECM detects a short to ground on the circuit that controls the lamp.
The ECM detects an open on the circuit that controls the lamp.
The ECM detects that the internal output driver is over temperature.
DTC P0381 is a Type C DTC.
DTC P0381 is a Type C DTC.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
Ignition ON, command the lamp ON and OFF with a scan tool. The lamp should turn ON and OFF as commanded.
⇒ | If the lamp is illuminated, test the lamp control circuit for a short to ground. If the circuit tests normal, replace the IPC. |
⇒ | If the lamp does not illuminate, test the lamp control circuit for a short to voltage, or an open/high resistance. If the circuit tests normal, replace the IPC/bulb. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for engine control module replacement, setup, and programming |