DTC P0351: Ignition Coil "A" Primary / Secondary Circuit; DTC P0352: Ignition Coil "B" Primary / Secondary Circuit; DTC P0353: Ignition Coil "C" Primary / Secondary Circuit; DTC P0354: Ignition Coil "D" Primary / Secondary Circuit: Description
HINT:
- These DTCs indicate malfunctions relating to the primary circuit.
- If DTC P0351 is stored, check the No. 1 ignition coil circuit.
- If DTC P0352 is stored, check the No. 2 ignition coil circuit.
- If DTC P0353 is stored, check the No. 3 ignition coil circuit.
- If DTC P0354 is stored, check the No. 4 ignition coil circuit.
A Direct Ignition System (DIS) is used on this vehicle.
The DIS is a 1-cylinder ignition system in which each cylinder is ignited by one ignition coil and one spark plug is connected to the end of each secondary wiring. A powerful voltage, generated in the secondary wiring, is applied directly to each spark plug. The sparks of the spark plugs pass from the center electrode to the ground electrodes.
The ECM determines the ignition timing and transmits the ignition (IGT) signals to each cylinder. Using the IGT signal, the ECM turns the power transistor inside the igniter on and off. The power transistor, in turn, switches on and off the current to the primary coil. When the current to the primary coil is cut off, a powerful voltage is generated in the secondary coil. This voltage is applied to the spark plugs, causing them to spark inside the cylinders. As the ECM cuts the current to the primary coil, the igniter sends back an ignition confirmation (IGF) signal to the ECM for each cylinder ignition.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0351 P0352 P0353 P0354 |
No IGF signal is sent to the ECM while the engine is running (ECM does not receive any IGF signals despite the ECM sending an IGT signal to the igniter) (1 trip detection logic). |
|
- Reference: Inspection using an oscilloscope.
Tester Connection Tool Setting Condition Specified Condition B30-108 (IGT1) - B30-104 (E1) 2 V/DIV., 20 msec./DIV. Idling The correct waveform is as shown B30-107 (IGT2) - B30-104 (E1) 2 V/DIV., 20 msec./DIV. Idling The correct waveform is as shown B30-106 (IGT3) - B30-104 (E1) 2 V/DIV., 20 msec./DIV. Idling The correct waveform is as shown B30-105 (IGT4) - B30-104 (E1) 2 V/DIV., 20 msec./DIV. Idling The correct waveform is as shown B30-23 (IGF1) - B30-104 (E1) 2 V/DIV., 20 msec./DIV. Idling The correct waveform is as shown HINT:
While cranking or idling the engine, check the waveform between terminals IGT (1 to 4) and E1, and IGF1 and E1 of the ECM connector.