P0351

2AZ-FXE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0351-P0354: Ignition Coil "A" Primary / Secondary Circuit

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 set, check the No. 1 ignition coil with igniter circuit.
- If DTC P0352 is set, check the No. 2 ignition coil with igniter circuit.
- If DTC P0353 is set, check the No. 3 ignition coil with igniter circuit.
- If DTC P0354 is set, check the No. 4 ignition coil with igniter circuit.

A Direct Ignition System (DIS) is used on this vehicle.
The DIS is an ignition system in which each cylinder is ignited by its own ignition coil and spark plug. The secondary wiring of each ignition coil generates a powerful voltage which is applied directly to each spark plug. The spark passes from the center electrode of the spark plug to the ground electrode.
The ECM (included in hybrid vehicle control ECU) 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 the engine, check the waveform between terminals IGT (1 to 4) and E1, and IGF and E1 of the ECM connector.

MONITOR DESCRIPTION

If the ECM (included in the hybrid vehicle control ECU) does not receive any IGF 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.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

WIRING DIAGRAM

INSPECTION PROCEDURE
HINT: Read freeze frame data using the Techstream. The ECM (included in the hybrid vehicle control ECU) records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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.

PROCEDURE

1. INSPECT IGNITION COIL ASSEMBLY (POWER SOURCE)

(a) Disconnect the ignition coil with igniter connector.
(b) Measure the resistance.
Standard resistance (Check for open):

(c) Turn the power switch on (IG).
(d) Measure the voltage between the terminals of the wire harness side connector.
Standard voltage:

(e) Reconnect the ignition coil with igniter connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - HYBRID VEHICLE CONTROL ECU)

(a) Disconnect the ignition coil with connector.
(b) Disconnect the C64 hybrid vehicle control ECU connector.
(c) Measure the resistance.
Standard resistance (Check for open):

Standard resistance (Check for open):

Standard resistance (Check for short):

(d) Reconnect the hybrid vehicle control ECU connector.
(e) Reconnect the ignition coil with igniter connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. CHECK WHETHER DTC OUTPUT RECURS (DTC P0351, P0352, P0353 OR P0354)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG) and turn the tester on.
(c) Clear the DTCs DTC Check / Clear.
(d) Shuffle arrangement of the ignition coils with igniters (among No. 1 to No. 4 cylinders).
NOTICE: Do not shuffle the connectors.
(e) Perform a simulation test.
(f) Check the DTCs displayed on the tester.
Result:

B -- REPLACE IGNITION COIL ASSEMBLY
A -- REPLACE HYBRID VEHICLE CONTROL ECU