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Home >> Lexus >> 2010 >> SC 430 V8-4.3L (3UZ-FE) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0354

P0354





3UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0351-P0358: Ignition Coil "A" Primary / Secondary Circuit


DESCRIPTION

A Direct Ignition System (DIS) is used on this vehicle.

The DIS is a 1-cylinder ignition system which ignites one cylinder with one ignition coil. In the 1-cylinder ignition system, the one spark plug is connected to the end of the secondary winding. High voltage generated in the secondary winding is applied directly to the spark plug. The spark of the spark plug passes from the center electrode to the ground electrode.

The ECM determines the ignition timing and outputs the ignition signals (IGTs) for each cylinder. Using the IGTs, the ECM turns the power transistor inside the igniter on/off, which switches on/off current to the primary coil. When current to the primary coil is cut off, high voltage is generated in the secondary coil and this voltage is applied to the spark plugs to create sparks inside the cylinders. As the ECM cuts current to the primary coil, the igniter sends back ignition confirmation signals (IGFs) for each cylinder ignition to the ECM.













- Reference: Inspection using an oscilloscope.

- While cranking or idling the engine, check the waveform between terminals IGT1 to IGT8 and E1, and IGF1 to IGF2 and E1 of the E2, E3 and E4 ECM connectors.

MONITOR DESCRIPTION





If the ECM does not receive an IGF after sending an IGT, it interprets this as a fault in the igniter and sets a DTC. The monitor runs for 1 second (the first second of engine idle) after the engine is started.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





COMPONENT OPERATING RANGE





CONFIRMATION DRIVING PATTERN





- Connect the Techstream to the DLC3.

- Turn the ignition switch to ON and turn the Techstream on.

- Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).

- Turn the ignition switch off and wait for at least 30 seconds.

- Turn the ignition switch to ON and turn the Techstream on [A].

- Start the engine.

- Idle the engine for 10 seconds or more [B].

- Enter the following menus: Powertrain / Engine / Trouble Codes [C].

- Read the DTCs.

HINT
- If a DTC is output, the system is malfunctioning.
- If a DTC is not output, perform the following procedure.
- Enter the following menus: Powertrain / Engine / Utility / All Readiness.

- Input the DTC: P0351, P0352, P0353, P0354, P0355, P0356, P0357 or P0358.

- Check the DTC judgment result.





HINT
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [B] through [C] again.
- If no DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.

HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
WIRING DIAGRAM









INSEPCTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT
- Read freeze frame data using the Techstream. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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.
- These DTCs indicate a malfunction related to a primary circuit.
- If DTC P0351 is displayed, check No. 1 ignition coil with igniter circuit.
- If DTC P0352 is displayed, check No. 2 ignition coil with igniter circuit.
- If DTC P0353 is displayed, check No. 3 ignition coil with igniter circuit.
- If DTC P0354 is displayed, check No. 4 ignition coil with igniter circuit.
- If DTC P0355 is displayed, check No. 5 ignition coil with igniter circuit.
- If DTC P0356 is displayed, check No. 6 ignition coil with igniter circuit.
- If DTC P0357 is displayed, check No. 7 ignition coil with igniter circuit.
- If DTC P0358 is displayed, check No. 8 ignition coil with igniter circuit.
PROCEDURE

1. INSPECT SPARK PLUG





(a) Remove the engine cover.

(b) Remove the ignition coil and the spark plug of the misfiring cylinder.

(c) Check the electrode for carbon deposits.

(d) Measure the spark plug's electrode gap.

Standard gap:

The electrode gap is 1.0 to 1.3 mm (0.039 to 0.051 in.).

Recommended Spark Plug:





NOTICE:
If the electrode gap is out of the standard, replace the spark plug. Do not adjust the electrode gap.

NG -- REPLACE SPARK PLUG
OK -- Continue to next step.

2. CHECK FOR SPARK AND IGNITION

(a) Disconnect the injector connectors to prevent the engine from starting.

CAUTION:
Always disconnect all injector connectors.

(b) Remove the ignition coil from the cylinder head.

(c) Install the spark plug to the ignition coil.

(d) Attach the spark plug to the cylinder head cover.

(e) Crank the engine within 2 seconds and check the spark.

NOTICE:
Do not crank the engine for more than 2 seconds.

OK:

Sparks jump across electrode gap.

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

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

(a) Disconnect the I1, I2, I3, I4, I5, I6, I7 and I8 ignition coil connectors.





(b) Disconnect the E4 ECM connector.

(c) Measure the resistance of the wire harness side connectors.

Standard Resistance:





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

4. INSPECT ECM (IGF1, IGF2, VOLTAGE)





(a) Disconnect the I1, I2, I3, I4, I5, I6, I7 and I8 ignition coil connectors.

(b) Turn the ignition switch to ON.

(c) Measure the voltage of the ECM connectors.

Standard Voltage:





NG -- REPLACE ECM Service and Repair
OK -- Continue to next step.

5. CHECK HARNESS AND CONNECTOR (IGNITION COIL - ECM)





(a) Disconnect the I1, I2, I3, I4, I5, I6, I7 and I8 ignition coil connectors.

(b) Disconnect the E2 and E4 ECM connectors.

(c) Measure the resistance of the wire harness side connectors.

Standard Resistance:





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

6. INSPECT ECM (IGT1, IGT2, IGT3, IGT4, IGT5, IGT6, IGT7, IGT8 VOLTAGE)





(a) Measure the voltage of the ECM connectors when the engine is cranked.

Standard Voltage:





NG -- REPLACE ECM Service and Repair
OK -- Continue to next step.

7. CHECK IGNITION COIL (POWER SOURCE)





(a) Disconnect the I1, I2, I3, I4, I5, I6, I7 and I8 ignition coil connectors.

(b) Turn the ignition switch from ON to start.

(c) Measure the voltage of the wire harness side connector.

Standard Voltage:





NG -- CHECK HARNESS AND CONNECTOR (IGNITION COIL - IG2 RELAY)

OK -- REPLACE IGNITION COIL

8. CHECK HARNESS AND CONNECTOR (IGNITION COIL - IG2 RELAY)

(a) Inspect the INJ fuse.





(1) Remove the INJ fuse from the engine room No. 2 relay block.

(2) Measure the resistance of the INJ fuse.

Standard Resistance:

Below 1 Ohms

(3) Install the INJ fuse to the engine room No. 2 relay block.

(b) Disconnect the I1, I2, I3, I4, I5, I6, I7 and I8 ignition coil connectors.





(c) Remove the IG2 relay from the engine room No. 1 relay block.

(d) Measure the resistance of the wire harness side connectors.

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE IGNITION COIL
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