Wait to Start Indicator Circuit Diagnosis (K07UFP)

Wait to Start Indicator Circuit Diagnosis (LC8\K07\UFP)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Circuit/System Description

The liquid propane control module supplies voltage to the Wait to Start lamp during the purge cycle. The purge cycle is enabled during the first 5-8 seconds of initial ignition ON. The liquid propane control module will not enable purge mode until the vehicle has been powered down for at least 2 minutes.

Reference Information

Schematic Reference

Engine Controls Schematics [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Circuit/System Verification

1. Ignition OFF.

2. Verify the Wait to Start indicator is not activated

• If the Wait to Start indicator is activated
Refer to Circuit/System Testing

• If the Wait to Start indicator is not activated

3. Ignition ON.

4. Verify the Wait to Start indicator activates for the initial 5-8 seconds of ignition ON and turns OFF.

• If the Wait to Start indicator does not activate or remains ON
Refer to Circuit/System Testing

• If the Wait to Start indicator activates for 5-8 seconds and turns OFF

5. All OK

Circuit/System Testing

1. Ignition OFF, disconnect the wait to start indicator.

2. Test for less than 10 ohms between the wait to start indicator ground circuit and ground.

• If 10 ohms or greater

1. Ignition OFF

2. Test for less than 2 ohms in the ground circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, repair the open/high resistance in the ground connection.

• If less than 10 ohms

3. Connect a test lamp between the wait to start indicator control circuit and ground. Ignition ON.

4. Verify a test lamp illuminates for 5-8 seconds on initial ignition ON.

• If the test lamp does not illuminate for 5-8 seconds

1. Ignition OFF.

2. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, test or replace the LPG control module.

• If the test lamp remains ON

1. Ignition OFF

2. Disconnect the harness connector at the LPG control module, Ignition ON

3. Test for less than 1 V between the control circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V, test or replace the LPG control module.

• If the test lamp illuminates for 5-8 seconds and turns OFF

5. Test or replace the wait to start indicator.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Wait to Start Indicator Replacement

* LPG Control Module Replacement