Diagnostic Aids

Check the following and repair as necessary:

• Shifted (incorrectly calibrated) fuel tank pressure sensor may cause DTC P0451 to set.
• Plugged sensor air vent hole.
• If DTCs P0108, P0113, P0118, P0123 and P0450 are set together, check for an open ground circuit.
• If DTCs P0107, P0122 and P0450 are set together, check for an open reference circuit.

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.