cadillac Workshop Repair Guides

Cadillac Workshop Service and Repair Manuals

ABOUT US
Manifold Air Temperature (MAT) Sensor <--> [Intake Air Temperature Sensor] > < Coolant Temperature Sensor/Switch (For Computer)|Specifications|Page 1979

Fleetwood FWD V8-273 4.5L (1988)

Page 1
background image

Engine Speed Signal: Description and Operation

The engine speed signal comes from a seven terminal High Energy Ignition (HEI) module in the distributor.  Pulses from the distributor are sent to the
ECM where the duration between these pulses are used to calculate engine speed.  The ECM adjusts spark advance and sends a signal back to the
distributor.

Manifold Air Temperature (MAT) Sensor <--> [Intake Air Temperature Sensor] > < Coolant Temperature Sensor/Switch (For Computer)|Specifications|Page 1979