Reduced Power Lamp (RPL) "On" Steady
Reduced Power Lamp (RPL) "ON" SteadyCircuit Description
The Reduced Power lamp (RPL) should be "ON" (only 3 seconds) steady with the ignition "ON" and the engine stopped. Ignition feed voltage is supplied to the RPL bulb through the meter fuse. The Engine Control Module (ECM) turns the RPL "ON" by grounding the RPL driver circuit.
The RPL should not remain "ON" with the engine running and no DTC(s) set. A steady RPL with the engine running and no DTC(s) suggests a short to ground in the RPL driver circuit.
Diagnostic Aids
An intermittent RPL may be caused by a poor connection, rubbed through wire insulation, or a wire broken inside the insulation. Check for the following items:
- Poor connection or damaged harness - Inspect the ECM harness and connectors for improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wire connection, and damaged harness.
Test Description
Number(s) below refer to the step number(s) on the Diagnostic Chart.
2. If the RPL does not remain "ON" when the Engine Control Unit is disconnected, the RPL driver wiring is not faulty.
3. If the RPL driver circuit is OK, the instrument panel cluster is faulty.
10. This vehicle is equipped with a ECM which utilizes an electrically erasable programmable read only memory (EEPROM). When the ECM is replaced, the new ECM must be programmed. Refer to ECM Replacement and Programming Procedures in Engine Control Module (ECM) and Sensors.
