P0354

2UR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0351-P0358: Ignition Coil "A" 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 a 1-cylinder ignition system in which each cylinder is ignited by one ignition coil and a 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.





* HINT
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 connector.

Standard





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

HINT
- When viewed from the rear of the engine assembly, Bank 1 is on the left side and Bank 2 is on the right side.
- Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. 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. PERFORM SIMULATION TEST

(a) Clear the DTC(s) DTC Check / Clear.

(b) Put the engine in inspection mode Inspection Mode Procedure.

(c) Change the arrangement of the ignition coils (with igniters).

NOTICE:
Do not change the location of the connectors.

(d) Perform a simulation test.

Result





B -- REPLACE IGNITION COIL ASSEMBLY Removal
A -- Continue to next step.

2. INSPECT IGNITION COIL ASSEMBLY (POWER SOURCE)

(a) Disconnect the E38, E30, E41, E33, E42, E34, E45 or E36 ignition coil connector.





(b) Turn the power switch on (IG).

(c) Measure the voltage according to the value(s) in the table below.

Standard voltage:





(d) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - ECM)

(a) Disconnect the E38, E30, E41, E33, E42, E34, E45 or E36 ignition coil connector.





(b) Disconnect the E2 and E4 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):





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) Put the engine in inspection mode Inspection Mode Procedure.

(d) Turn the Techstream ON.

(e) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

(f) Read DTCs.

Result





B -- SYSTEM OK

A -- REPLACE ECM Removal