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.
An intermittent may be caused by poor connections, misrouted harness, rubbed through wire insulation or broken wire inside insulation. Check for poor connection at PCM, backed out terminals, improper mating, broken lock, improperly formed or damaged terminals and poor terminal to wire connection. Using scan tool, monitor APS1, 2 and 3 parameter, while moving wire harnesses and connectors. A change in display will indicate location of fault. If DTC P1290 cannot be duplicated, check scan tool FAILURE RECORDS to determine mileage since last DTC was set.