Description

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 one 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 electrodes to the ground electrodes.

The ECM determines the ignition timing and transmits the ignition (IGT) signals 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 (iGf) signal to the ECM, for each cylinder ignition.

Crankshaft Position Sensor

Other Sensors

(Engine Coolant Temperature Sensor, Mass Air Flow Meter, Throttle Position Sensor, etc.

IGT1 IGF1

Igniter

From Battery

Igniter

From Battery

No. 1 Ignition Coil with Igniter No. 1 Cylinder

IGT1 IGF1

IGT5?

No. 1 Ignition Coil with Igniter No. 1 Cylinder

-L- Ignition Coli Spark Plug =

No. 2 Cylinder

No. 2 Ignition Coil with Igniter

No. 3 Ignition Coil with Igniter

No. 4 Cylinder

No. 4 Ignition Coil with Igniter

No. 5 Cylinder

No. 5 Ignition Coil with Igniter

TACH I No. 6 Ignition Coil with Igniter

To Tachometer

DTC No.

DTC Detection Conditions

Trouble Areas

P0351 P0352 P0353 P0354 P0355 P0356

No IGF signal to ECM while engine running (1 trip detection logic)

• Ignition system

• Open or short in IGF1 or IGT circuit (1 to 6) between ignition coil with igniter and ECM

• No. 1 to No. 6 ignition coils with igniters

• ECM

IGT and IGF Signal Waveform

IGT and IGF Signal Waveform

CH 1

CH 2

Division

20 msec./Division a031764E02

Reference: Inspection using an oscilloscope

While cranking or idling, check the waveform between terminals IGT(1 to 6) and E1, and IGF1 and E1 of the ECM connector.

Items

Contents

Terminals

CH1: IGT1, IGT2, IGT3, IGT4, IGT5, IGT6 - E1 CH2: IGF1 - E1

Equipment Settings

2 V/Division, 20 ms/Division

Conditions

Cranking or idling

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