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.
The ECM monitors the peak voltage duration of the ignition primary circuit. If abnormal signal is detected, the ECM sets DTC P0352.
ITEM | DETECTING CONDITION | POSSIBLE CAUSE |
DTC Strategy | ● Monitoring ignition coil primary voltage | ● Open or short in power supply circuit ● Open or short in control circuit ● Contact resistance in connectors ● Faulty ignition coil |
Enable Conditions | ● Coolant temperature 〉75℃(167℉) ● Over voltage duration depending on engine speed and air mass flow | |
Threshold Value | ● Over voltage duration = 0 ● Over voltage duration 〈 α ● Over voltage duration of each ignition output overlapping below 4500 rpm | |
Diagnostic Time | ● 255 revolutions |
Ignition Coil | Normal Parameter at 20℃ (68℉) |
Resistance (Primary) | Approx. 0.96 ± 10% (Ω) |
Resistance (Secondary) | Approx.12.5 ± 15% (kΩ) |
