Results Of Incorrect Operation

An ignition control circuit that is open, grounded, or short to voltage will set an ignition control circuit DTC. If a fault occurs in the IC output circuit when the engine is running, the engine will experience a misfire. DTCs P1351-P1366 indicate that a malfunction has been detected on an ignition control circuit.

The PCM uses information from the engine coolant temperature sensor in addition to the RPM to calculate the spark advance values as follows:
^ A high RPM more advance
^ A cold engine = more advance
^ A low RPM = less advance
^ A hot engine = less advance

Therefore, detonation could be caused by a high resistance in the engine coolant temperature sensor circuit. Poor performance could be caused by a low resistance in the engine coolant temperature sensor circuit.

If the engine cranks but will not run or immediately stalls, the Engine Cranks But Will Not Run diagnostic table must be used to determine if the failure is in the ignition system or the fuel system.