Results of Incorrect Operation

An ignition control circuit that is open, grounded, or showed to voltage sets an ignition control circuit DTC. If a fault occurs in the IC output circuit when the engine is running, the engine experiences a misfire. DTCs P0351-P0358 set when a malfunction is detected with an ignition control circuit. The PCM disables the injector for the appropriate cylinder when an ignition control DTC sets.

The PCM uses information from the engine coolant temperature sensor in addition to RPM to calculate spark advance values as follows:
^ High RPM = more advance
^ Cold engine = more advance
^ Low RPM = less advance
^ Hot engine = less advance

High resistance in the engine coolant temperature sensor circuit could cause detonation. Low resistance in the engine coolant temperature sensor circuit may cause reduced performance.

The Engine Cranks But Will Not Run diagnostic table must be used in order to determine if the failure is in the ignition system or the fuel system if the engine cranks but does not run or immediately stalls. If DTC P0300, P0341, P0342, P0343, P0335, P0336 is set, the appropriate DTC table must be used for diagnosis.