Montero LS 4WD V6-2972cc 3.0L SOHC 24 Valve (1996)
Ignition Coil Pack: Description and Operation
PURPOSE
The vehicle uses a three coil "wasted spark" type ignition system. The system gives accurate spark timing without using a distributor.
OPERATION
When the ignition power transistor unit A is turned on by the signal from the engine control module, primary current flows to the ignition coil A.
When the ignition power transistor unit A is turned off, the primary current is shut off and a high voltage is induced in the secondary coil A,
causing the ignition plugs of No. 1 and No. 4 cylinders to spark. When the ignition power transistor unit B is turned off, the ignition plugs of No. 2
and No. 5 cylinder spark. In addition, when the ignition power transistor unit C is turned off, the ignition plugs of No. 3 and No. 6 cylinders spark.
When the engine control module turns off the transistor in the unit, the battery positive voltage in the unit is applied to the ignition power transistor
unit to turn it on. When the engine control module turns on the transistor in the unit, the ignition power transistor unit is turned off.
