Installation manual

6-13
90-898305
Temperature Sensor
Three (3) temperature sensors (2 on 1.5L models) are used to provide
cylinder head temperature information to the ECM. One sensor is mounted in
each cylinder head and one in the air compressor cylinder head. The ECM
uses this information to increase injector pulse width for cold starts and to
retard timing in the event of an over-heat condition.
An ohms test of the temperature sensor would be as follows:
Insert digital or analog ohmmeter test leads into both TAN/BLACK sensor
leads. With engine at temperature (Fº) indicated, ohm readings should be as
indicated ±10%.
Manifold Absolute Pressure (MAP) Sensor
The ECM regulates fuel flow, in part, based on manifold absolute pressure
(MAP). Drawing a vacuum on the MAP sensor will create a lean fuel condition.
Air Temperature Sensor
The air temperature sensor is mounted on the intake manifold. The ECM
regulates fuel flow, in part, based on manifold air temperature. As air
temperature increases, the ECM decreases fuel flow.
Notes
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