Diagnostic Aids

An open in idle signal circuit will not set DTC P0120 or P0121. If DTCs P0105, P0110, P0115 and P0120 are also set, sensor ground circuit may be at fault.

An intermittent malfunction may be caused by a poor connection, rubbed-through wire insulation, or a wire broken inside insulation. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, or poor terminal-to-wire connections before component replacement.