Diagnostic Aids

This DTC indicates lower than normal coolant temperatures and probably does not indicate a faulty ECT sub-system. Check for a stuck thermostat, cooling fan always on, a skewed ECT sensor or resistance in wiring. See ECT & IAT SENSOR RESISTANCE-TO-TEMPERATURE VALUES  table. A shifted sensor could result in poor driveability complaints.

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.