Diagnostic Aids
WARNING: This page is about a different car, the 2002 Isuzu Trooper. However, it is still accessible from the selected car via links, so may be relevant.
Intermittent problem may be caused by poor connections, misrouted harness, rubbed through wire insulation, broken wire inside insulation. Check for faulty connections at PCM. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, faulty terminal to wire connection. Check for wire harness damage. Using scan tool, observe appropriate scan tool display while moving related wire harness connectors and wire harnesses. A change in display will indicate location of fault. If DTC P1312 can not be duplicated, reviewing scan tool FAILURE RECORDS data can be useful in determining mileage and frequency of DTC occurrence.