P0352

2AZ-FXE ENGINE CONTROL: SFI SYSTEM: P0351-P0354: 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 assembly circuit.
- If DTC P0352 is set, check the No. 2 ignition coil assembly circuit.
- If DTC P0353 is set, check the No. 3 ignition coil assembly circuit.
- If DTC P0354 is set, check the No. 4 ignition coil assembly circuit.

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

The DIS is an ignition system in which each cylinder is ignited by it's own ignition coil assembly 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 hybrid vehicle control ECU determines the ignition timing and transmits the ignition (IGT) signals to each cylinder. Using the IGT signal, the hybrid vehicle control ECU 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 hybrid vehicle control ECU cuts the current to the primary coil, the igniter sends back an ignition confirmation (IGF) signal to the hybrid vehicle control ECU, 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 hybrid vehicle control ECU connector.

MONITOR DESCRIPTION

If 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

CONFIRMATION DRIVING PATTERN

1. Connect the Techstream to the DLC3.

2. Turn the power switch on (IG) and turn the Techstream on.

3. Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

4. Turn the power switch off and wait for at least 30 seconds.

5. Turn the power switch on (IG) and turn the Techstream on [A].

6. Put the engine in inspection mode Component Tests and General Diagnostics.

7. Start the engine.

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

9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

10. Read the DTC [C].

HINT
- If a DTC is output, the system is malfunctioning.
- If a DTC is not output, perform the following procedure.

11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

12. Input the DTC: P0351, P0352, P0353 or P0354.

13. 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.

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT
Read freeze frame data using the Techstream. 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 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 HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - BODY GROUND)

(a) Disconnect the ignition coil assembly connectors.

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

Standard Resistance (Check for Open):

(c) Reconnect the ignition coil assembly connectors.

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

2. INSPECT IGNITION COIL ASSEMBLY (POWER SOURCE)

(a) Disconnect the ignition coil assembly connectors.

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

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

Standard Voltage:

Text in Illustration

(d) Reconnect the ignition coil assembly connectors.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION COIL ASSEMBLY - IG2 RELAY)
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - HYBRID VEHICLE CONTROL ECU)

(a) Disconnect the ignition coil assembly connectors.

(b) Disconnect the hybrid vehicle control ECU connector.

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

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 assembly connectors.

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

4. 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).

(c) Turn the Techstream on.

(d) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(e) Shuffle arrangement of the ignition coil assemblies (among No. 1 to No. 4 cylinders).

NOTICE:
Do not shuffle the connectors.

(f) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.

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

(h) Read the DTCs.

Result:

B -- REPLACE IGNITION COIL ASSEMBLY Removal

A -- REPLACE HYBRID VEHICLE CONTROL ECU Removal