System Description

PURPOSE
The Motronic ignition system provides precise ignition control to provide optimum performance, driveability and emissions compliance.The ignition system no longer uses a distributor.It uses three Double-ended ignition coils to fire two spark plugs at a time. A stronger ignition spark can be delivered since the rotor and cap are no longer used. The system is also easier to maintain as no routine adjustments are necessary.

OPERATION
There are three ignition coils. They are located on the left side of the cylinder head. The Motronic ECM operates each Double-ended ignition coil via the power output stage (power stage).
The power stage along with the heat sink is located on the backside of the ignition coils. When the power stage fires an ignition coil, spark is supplied to two spark plugs at a time.
One spark plug fires during the compression stroke and the other plug fires during the exhaust stroke. When the spark plug for cylinder #1 fires on its compression stroke, the plug for cylinder #6 fires during its exhaust stroke. The same procedure is followed for the remaining cylinders #2 and #5 and #3 and #4.

COMPONENTS OR SIGNALS
The Motronic ignition system in this vehicle uses the following components or signals:

NOTE: Some ignition related components or signals may be covered in a different section.


^ Camshaft Position Sensor
^ Three Power Stages
^ Three "Double-ended" Ignition coils
^ Two Knock Sensors
^ Spark plug wires
^ Spark plugs