Diagnostic Aids

If DTCs P0115 and P0116 are both set, ECT sensor circuit may be open. Diagnose P0115 first. If DTCs P0105, P0110, P0115 and P0120 are also set, ECT sensor ground circuit may be at fault. Ensure engine coolant level is full. Check for a shifted ECT sensor. See ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE  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.