P0351
1UR-FSE 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
DTC P0355 - Ignition Coil "E" Primary / Secondary Circuit
DTC P0356 - Ignition Coil "F" Primary / Secondary Circuit
DTC P0357 - Ignition Coil "G" Primary / Secondary Circuit
DTC P0358 - Ignition Coil "H" 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 circuit.
- If DTC P0352 is set, check the No. 2 ignition coil circuit.
- If DTC P0353 is set, check the No. 3 ignition coil circuit.
- If DTC P0354 is set, check the No. 4 ignition coil circuit.
- If DTC P0355 is set, check the No. 5 ignition coil circuit.
- If DTC P0356 is set, check the No. 6 ignition coil circuit.
- If DTC P0357 is set, check the No. 7 ignition coil circuit.
- If DTC P0358 is set, check the No. 8 ignition coil circuit.
A Direct Ignition System (DIS) is used on this vehicle.
The DIS is an ignition system in which each cylinder is ignited by one ignition coil and the 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 electrode to the ground electrodes.
The ECM determines the ignition timing and transmits the ignition signals (IGT) 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 signal (IGF) 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 8) and E1, and IGF1, IGF2 and E1 of the ECM connectors.
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 1 second after the engine is next started.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
COMPONENT OPERATING RANGE
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. PERFORM SIMULATION TEST
(a) Clear the DTC(s) DTC Check / Clear.
(b) Change the arrangement of the ignition coils (with igniters).
NOTE:
Do not change the location of the connectors.
(c) Perform a simulation test.
Result:
B -- REPLACE IGNITION COIL ASSEMBLY
A -- Continue to next step.
2. INSPECT IGNITION COIL ASSEMBLY (POWER SOURCE)
(a) Disconnect the ignition coil connector.
(b) Turn the engine switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:
NG -- INSPECT IGNITION COIL ASSEMBLY (GROUND CIRCUIT)
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - ECM)
(a) Disconnect the ignition coil connector.
(b) Disconnect the ECM connectors.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):
Standard resistance (Check for short):
Standard resistance (Check for open):
Standard resistance (Check for short):
(d) Reconnect the ignition coil connector and ECM connectors.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. CHECK IF DTC OUTPUT RECURS
(a) Clear the DTC DTC Check / Clear.
(b) Connect the Techstream to the DLC3.
(c) Turn the engine switch on (IG) and turn the Techstream ON.
(d) Enter the following menus: Powertrain / Engine / Trouble Codes.
(e) Read DTCs.
Result:
B -- SYSTEM OK
A -- REPLACE ECM
5. INSPECT IGNITION COIL ASSEMBLY (GROUND CIRCUIT)
(a) Disconnect the ignition coil connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
(c) Reconnect the ignition coil connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION COIL ASSEMBLY - GROUND)
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION COIL ASSEMBLY - IG2 RELAY)