2GR-FE (ENGINE CONTROL): SFI SYSTEM: P0351-P0356; Ignition Coil "A" Primary / Secondary Circuit; 2016 MY Sienna [12/2015

HINT:

These DTCs indicate malfunctions relating to the primary circuit.
If DTC P0351 is stored, check the No. 1 ignition coil assembly circuit.
If DTC P0352 is stored, check the No. 2 ignition coil assembly circuit.
If DTC P0353 is stored, check the No. 3 ignition coil assembly circuit.
If DTC P0354 is stored, check the No. 4 ignition coil assembly circuit.
If DTC P0355 is stored, check the No. 5 ignition coil assembly circuit.
If DTC P0356 is stored, check the No. 6 ignition coil assembly circuit.

The direct ignition system is a 1-cylinder ignition system in which each cylinder is ignited by one ignition coil assembly 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. Spark of the spark plugs passes 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 6) and E1, and IGF1 and E1 of the ECM connectors.

HINT:

The wavelength becomes shorter as the engine speed increases.

Item

Content

ECM Terminal Names

Between IGT (1 to 6) and E1

Between IGF1 and E1

Tester Range

2 V/DIV., 20 ms./DIV.

Condition

Idling with warm engine

MONITOR DESCRIPTION

If the ECM does not receive any IGF signals despite the IGT signal being transmitted, it interprets this as a fault in the igniter and stores a DTC.

If the malfunction is not repaired successfully, a DTC is stored 1 second after the engine is next 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 procedure) (See page ).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON and turn the Techstream on.
Start the engine.
Idle the engine for 10 seconds [A].
Enter the following menus: Powertrain / Engine / Trouble Codes [B].
Read pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P0351, P0352, P0353 or P0354.

Check the DTC judgment result.

Techstream Display	Description
NORMAL	DTC judgment completed System normal
ABNORMAL	DTC judgment completed System abnormal
INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

HINT:

If the judgment result shows ABNORMAL, the system has a malfunction.
If the result shows INCOMPLETE or N/A, perform steps [A] through [B] again.

If no pending DTC is output, perform a universal trip and check for permanent DTCs (See page ).
HINT:
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

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

Read freeze frame data using the 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 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

Result

Perform "Inspection After Repair" after replacing the ignition coil assembly (See page

2016 MY Sienna [12/2015 - 08/2016]; 2GR-FE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

Text in Illustration

(a) Disconnect the B23, B24, B25, B26, B27 and B28 ignition coil assembly connectors.