Diagnostic Aids
An intermittent may be caused by a poor connection, mis-routed harness, rubbed through wire insulation or a wire broken inside the insulation. Check for:
- Poor Connection At PCM pin
Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection. - Mis-Routed Harness
Inspect MAF sensor harness to ensure it is not too close to high voltage wires, such as spark plug wires. - Damaged Harness
Inspect harness for damage. If harness appears okay, observe Tech-1 while moving related connectors and wiring harness. A change in display would indicate intermittent fault location. - Plugged Air Intake Filter
A wide-open throttle acceleration from a stop should cause MAF reading on Tech-1 to range from approximately 4-7 grams per second at idle to 100 or greater at time of 1-2 shift. If not, check for restriction.