DTC 44

CIRCUIT DIAGRAM





USING MULTI-USE TESTER





USING OSCILLOSCOPE



HARNESS TEST

Ignition Coil And Power Transistor Circuit:

OPERATION

When power transistor A is turned on by the signal from ECU, the primary current will flow into ignition coil A. When the Transistor A is turned off, the primary current is cut off to induce the high Voltage in secondary coil A. This generates sparks on the spark plugs in the No.1 and No.4 cylinders. On the other hand, when power transistor B is turned off to cut off the primary current of ignition coil B, sparks will be generated on the spark plugs in the No.2 and No.3 cylinders.


TROUBLESHOOTING HINTS

If a short-circuit or wire breakage occurs in the ignition system, the engine will be considerably disordered.