Diagnostic Aids
WARNING: This page is about a different car, the 2002 Isuzu Trooper, 2002 Isuzu Rodeo Sport, 2002 Isuzu Rodeo, 2002 Isuzu Axiom, and 2002 Honda Passport. However, it is still accessible from the selected car via links, so may be relevant.
An intermittent problem may be caused by a poor connection, rubbed-through wire insulation or a wire broken inside the insulation. Check for poor connection or damaged harness. Inspect PCM harness and connectors for improper mating, broken locks, improperly formed or damaged terminals, poor terminal-to-wire connection, and damaged harness. Faulty Engine Coolant Temperature (ECT) sensor. Using scan tool, compare engine coolant temperature with intake air temperature on a completely cool engine. Engine coolant temperature should be within 50 °F (10 °C) of intake air temperature. If not, replace the ECT sensor.