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Home >> Cadillac >> 1983 >> Cimarron Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - Single Unit TBI >> Operation >> Data Sensors >> Engine Speed Sensor
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Engine Speed Sensor

The engine speed signal comes from the Hall Effect Unit mounted above the distributor on the 2.5L engine and from terminal "R" of the conventional HEI module in the distributor on all other models. Pulses from the distributor are sent to the ECM where the time between these pulses is used to calculate engine speed. The ECM adds spark advance modifications to the signal and sends the signal back to the distributor.

NOTE: More sensors are used by the ECM to control engine performance and other systems. Refer to COMPUTER COMMAND CONTROL in COMPUTERIZED ENGINE CONTROLS section for more information.
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