Diagnostic Aids

CMP sensor performance may be affected by temperature. Resistance should be 835-1400 ohms at 14-122°F (-10-50°C) and 1060-1645 ohms at 122-212°F (50-100°C). CMP sensor performance can be checked with a DVOM and scan tool. Using DVOM, measure AC output voltage across CMP sensor terminals at different engine speeds. Compare scan tool value with DVOM reading. If readings are not nearly equal, check for a faulty sensor or signal rotor. If DTC P0340 sets while driving and checks okay, check for inadequate CMP sensor circuit shielding. Check drain wire for a good ground.

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.