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 (PCM) provides a switching circuit to ground for energizing the primary ignition coils. The PCM 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.
Checking output signals from ignition coils every 10 sec. under detecting condition, if signals indicating open of short in the circuit are detected for more than 5 sec., PCM sets P0356. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle.
Item
Detecting Condition
Possible cause
DTC Strategy
? Detects a short to ground, to battery or open circuit
? Poor connection
? Open or short in harness
? Ignition Coil
? PCM
Enable Conditions
? NO DTC related to this item
? Engine running state
? 11V = Battery voltage = 16V
? The above conditions are met > 0.5 sec.
Threshold value
? Open or short
Diagnosis Time
? Continuous (More than 5 sec.failure for every 10 sec.test)
MIL On Condition
? 2 driving cycles
Resistance (?)
Primary Coil
Secondary Coil
0.62 ± 10%
7.0k ± 15%