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 related to the primary circuit.
• If DTC P0351 is displayed, check the No. 1 (#1) ignition coil circuit.
• If DTC P0352 is displayed, check the No.2 (#2) ignition coil circuit.
• If DTC P0353 is displayed, check the No. 3. (#3) ignition coil circuit.
• If DTC P0354 is displayed, check the No.4 (#4) ignition coil circuit.

A Direct Ignition System (DIS) is used on this vehicle.

The DIS is a 1-cylinder ignition system which ignites one cylinder with one ignition coil. In the 1-cylinder ignition system, the one spark plug is connected to the end of the secondary winding. High voltage generated in the secondary winding is applied directly to the spark plug. The spark of the spark plug passes from the center electrode to the ground electrode.

The ECM determines the ignition timing and outputs the ignition (IGT) signals for each cylinder. Using the IGT signal, the ECM turns ON and OFF the power transistor inside the igniter and this switches ON and OFF the current to the primary coil. When the current flow to the primary coil is cut off, high-voltage is generated in the secondary coil and this voltage is applied to the spark plugs to spark inside the cylinders. As the ECM cuts the current to the primary coil, the igniter sends back the ignition confirmation (IGF) signal to the ECM.

Fig 1: Crankshaft Position Sensor And Camshaft Position Sensor Function Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Reference: Inspection using an oscilloscope.

Fig 2: Identifying Signal Waveform

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

The correct waveform is as shown.