Ignition failure sensor is used to check whether the spark ignition is occurred correctly or not and also used to tachometer drive. The sensor monitors the voltage difference between a resistance which is on the battery circuit for ignition coil. When the ignition coil works properly, the electric current through the resistance is detected as voltage drop. This is confirmed for every ignition event with the crankshaft sensor and the camshaft sensor. If PCM detects a malfunction, no ignition is possible, so the engine would not start. If there is no ignition signal for a predetermined cycle for one or two ignition coils, an ignition coil circuit failure exists.
If there is no current at 3 ignition coils group during 32 ignitions, the PCM determines that a fault exists and a DTC is stored.
Item
Detecting Condition
Possible cause
DTC Strategy
? Current through ignition coil is monitored.
? Poor connection
? Open or short in IG failure sensor circuit
? Faulty IG failure sensor
? Faulty PCM
Enable Conditions
Threshold value
? No current at the 3 ignition coils group during 10.7 revs.(32 ignitions)
Diagnosis Time
? Continuous