Cherokee 4WD V6-173 2.8L VIN W 2-bbl (1985)
Crankshaft Position Sensor: Description and Operation
On all models with full function systems except V6-229 (1983-84 VIN code 9) engines, the ``R'' terminal on the 7 terminal ignition module provides
reference pulses to the ECM indicating engine RPM and crankshaft position.
