Calais L4-151 2.5L VIN U TBI (1989)
CHART A-3(Page 2 of 3)ENGINE CRANKS BUT WON'T RUN
Circuit Description:
A magnetic crank sensor is used to determine engine crankshaft position, much the same way as the pick-up coil did in HEI type systems. The sensor is
mounted in the block, near a slotted wheel on the crankshaft. The rotation of the wheel creates a flux change in the sensor, which produces a voltage
signal. The DIS ignition module processes this signal and creates the reference pulses needed by the ECM to trigger the correct coil at the correct time. If
the "Scan" tool did not indicate cranking rpm, and there is no spark present at the plugs, the problem lies in the direct ignition system or the power and
ground supplies to the module.
