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 [08/2013 - ]: Description

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

These DTCs indicate malfunctions relating to the primary circuit.
If DTC P0351 is output, check the No. 1 ignition coil assembly circuit.
If DTC P0352 is output, check the No. 2 ignition coil assembly circuit.
If DTC P0353 is output, check the No. 3 ignition coil assembly circuit.
If DTC P0354 is output, check the No. 4 ignition coil assembly 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 assembly 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 spark of the spark plugs passes 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 the current supplied to the primary coil on and off. 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.

Fig 1: Ignition Coil System Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DTC No.	DTC Detection Condition	Trouble Area
P0351 P0352 P0353 P0354	No IGF signal to the ECM while the engine is running (1 trip detection logic).	Ignition system Open or short in IGF1 or IGT circuit (1 to 4) between ignition coil assembly and ECM No. 1 to No. 4 ignition coil assemblies ECM

Reference: Inspection using an oscilloscope.

Fig 2: Identifying Waveform 4
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

The correct waveform is as shown.

While idling the engine, check the waveform between terminals IGT (1 to 4) and E1, and IGF1 and E1 of the ECM connector.

ECM Terminal Name	CH1: Between IGT (1 to 4) and E1 CH2: Between IGF1 and E1
Tester Range	2 V/DIV., 20 ms./DIV.
Condition	Idling