With the ignition switch in the ON or START position, voltage is applied to the ignition coil.
Each ignition coil consists of two coils. High tension leads go to each cylinder from the ignition coils.
The ignition coils fire two spark plugs on every power stroke (the cylinder under compression and the cylinder on the exhaust stroke). The Engine Control Module (ECM) provides a switching circuit to ground for energizing the primary ignition coils. The ECM uses the crankshaft position sensor and camshaft position sensor signal to time the energizing of the coil. When a primary ignition coil is energized and de-energized, the secondary coil produces a high voltage spike to the attached spark plugs.
If there is no voltage of 1 or 2 ignition coil group, the ECM judged as a fault and DTC is set.
Item
Detecting Condition
Possible Cause
DTC Strategy
? Voltage through ignition coil is monitored
? Poor connection
? Open or short in ignition coil circuit
? Defective ignition coil #1/#2
? Defective ECM
Enable Conditions
? Engine speed < 5000rpm
Threshold value
? No voltage of 1 or 2 ignition coil group (during 32 ignitions)
Diagnostic Time
? Continuous
MIL ON condition
? 2 driving cycles