P0351

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

DTC Detection Condition:

HINT:
- These DTCs indicate malfunctions relating to the primary circuit.
- If DTC P0351 is set, check No. 1 ignition coil circuit.
- If DTC P0352 is set, check No. 2 ignition coil circuit.
- If DTC P0353 is set, check No. 3 ignition coil circuit.
- If DTC P0354 is set, check 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 1 ignition coil, and 1 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 electrodes 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.





Reference: Inspection using an oscilloscope.
While cranking or idling, check the waveform between terminals IGT (1 to 4) and E1, and IGF and E1 of the E5 ECM connectors.

MONITOR DESCRIPTION

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

Component Operating Range:

If the ECM does not receive any IGF1 signals despite transmitting the IGT signal, it interprets this as a fault in the igniter and sets a DTC.

If the malfunction is not repaired successfully, a DTC is set 1 second after the engine is next started.

Wiring Diagram:

Step 1-3:

Step 3(Continued):

Step 4-5:

Step 5(Continued):

INSPECTION PROCEDURE

HINT: Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.