Direct Ignition System (Dis)

The crankshaft angle sensor detects slots (4 per cylinder, 20 degrees apart) around an extension of the drive plate. Basic timing is preset by crankshaft sensor position and is not adjustable. By using a crankshaft sensor, spark scatter has been eliminated.

A camshaft angle sensor supplies fuel injection synchronization and cylinder identification information by sensing slots located on camshaft sprocket or camshaft (Monaco and Premier). For sensor location, see the CAMSHAFT ANGLE SENSOR  table.

The SBEC fires one coil at a time. This one coil in turn fires 2 spark plugs simultaneously. One cylinder is on compression stroke and the other cylinder is on exhaust stroke. A low primary resistance allows SBEC to fully charge ignition coils for each firing. See Fig 1.

Fig 1: DIS Molded Coil Terminal ID

Courtesy of CHRYSLER MOTORS.