Trooper LTD 4WD V6-3.5L (2002)
Reduced Power Lamp (RPL) "ON" Steady
Circuit Description
The Reduced Power Lamp (RPL) should be turned "OFF" after "ON" for 3 seconds with ignition "ON" and the engine stopped. Ignition feed voltage is
supplied directly to the RPL indicator. The powertrain control module (PCM) 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 may be cased by a poor connection, rubbed-through wire insulation, or a wire broken inside the insulation. Check for the following items:
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Poor connection or damaged harness-Inspect the PCM 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 PCM is disconnected, the RPL driver wiring is not faulty.
3. If the RPL driver circuit is OK, the instrument panel cluster is faulty.
6. This vehicle is equipped with a PCM which utilizes an electrically erasable programmable read only memory (EEPROM). When the PCM is
replaced, the new PCM must be programmed. Refer to PCM Replacement and Programming Procedures in Powertrain Control Module (PCM)
and Sensors.
