Grand Prix V6-204 3.4L DOHC VIN X SFI (1995)
DIAGNOSTIC AIDS
An intermittent may be caused by a poor connection, rubbed through wire insulation, or a wire broken inside the insulation.
Poor connection or damaged harness
Inspect PCM harness connectors for backed out terminals "A2" or "A8," improper mating, broken locks, improperly formed or damaged terminals,
poor terminal to wire connection, and damaged harness.
Intermittent test
If connections and harness check OK, a digital voltmeter connected from affected terminal to ground while moving related connectors and wiring
harness. If the failure is induced, the voltage reading will change.
Mis-scaled Engine Coolant Temperature (ECT) sensor
See "Engine Coolant Temperature Sensor Temperature vs. Resistance Values" table on DTC P0117 chart.
Basic cooling system problem
Test cooling system operation.
