P0351

1ZZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0351: 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 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 winding. A powerful voltage, generated in the secondary winding, 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 IGF1 and E1 of the E3 ECM connector.

MONITOR DESCRIPTION

If the ECM 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 1second 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 Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. CHECK WHETHER DTC OUTPUT RECURS (DTC P0351, P0352, P0353 OR P0354)
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Turn the tester on.
(d) Clear DTCs (DTC Check / Clear).
(e) Shuffle arrangement of the ignition coils with igniters (among No. 1 to No. 4 cylinders).

NOTE: Do not shuffle the connectors.

(f) Perform a simulation test.
(g) Check DTCs displayed on the tester.
Result:

B -- REPLACE IGNITION COIL ASSEMBLY
A -- Continue to next step.
2. INSPECT ECM (IGT1, IGT2, IGT3, IGT4 AND IGF1 SIGNAL)

(a) Inspect the ECM using an oscilloscope.
(1) While cranking or idling, check the waveform between the terminals of the E3 ECM connector.
Standard:

NG -- REPLACE ECM
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - ECM)

(a) Disconnect the I2, I3, I4 or I5 ignition coil with igniter connector.
(b) Disconnect the E3 ECM connector.
(c) Check the resistance.
Standard resistance (Check for open):

Standard resistance (Check for open):

Standard resistance (Check for short):

(d) Reconnect the ECM connector.
(e) Reconnect the ignition coil with igniter connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. INSPECT IGNITION COIL ASSEMBLY (POWER SOURCE)

(a) Disconnect the I2, I3, I4 or I5 ignition coil with igniter connector.
(b) Check the resistance.
Standard resistance (Check for open):

(c) Turn the ignition switch to the ON position.
(d) Measure the voltage between the terminals of the wire harness side connector.
Standard voltage:

(e) Reconnect the ignition coil with igniter connector.
NG -- REPLACE IGNITION COIL ASSEMBLY
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - IGNITION SWITCH)

(a) Disconnect the I2, I3, I4 or I5 ignition coil with igniter connector.
(b) Disconnect the I11 ignition switch connector.
(c) Check the resistance.
Standard resistance (Check for open):

Standard resistance (Check for short):

(d) Reconnect the ignition coil with igniter connector.
(e) Reconnect the ignition switch connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE IGNITION COIL ASSEMBLY