Diagnostic Aids

Check for faulty connections or damaged harness. Ensure harness is not routed too close to high voltage wires, such as spark plug cables. If connections and harness appear okay, observe ECT display on scan tool while moving all related harnesses and connectors. A change in scan tool display indicates fault location. Check for ECT sensor out of range. See ECT SENSOR RESISTANCE VALUES  table under DTC P0117. If DTC cannot be duplicated, FAILURE RECORDS data can be used in determining vehicle mileage since DTC was last set. If it is determined that DTC occurs intermittently, performing DTC P1115: ECT SENSOR CIRCUIT INTERMITTENT HIGH VOLTAGE  may isolate cause of fault.