Illustration 29 g01330325
(6) Engine oil pressure sensor (7) Primary speed/timing sensor (8) Secondary speed/timing sensor
Illustration 28 and illustration 29 shows the sensors
and the ECM in position on the engine.
Failure of Sensors
All Sensors
A failure of any of the sensors may be caused by one
of the following malfunctions:
• Sensor output is open.
• Sensor output is shorted to “- battery” or “+
battery” .
• Measured reading of the sensor is out of the
specification.
Programmable Monitoring System
(PMS)
The Programmable Monitoring System determines
the level of action that is taken by the Engine Control
Module (ECM) (5) in response to a condition that can
damage the engine. These conditions are identified
by the ECM from the signals that are produced from
the following sensors.
• Coolant Temperature Sensor
• Intake manifold Air Temperature Sensor
• Intake manifold Pressure Sensor
• Fuel Pressure Sensor
• Engine Oil Pressure Sensor
• Primary Speed/Timing Sensor
• Secondary Speed/Timing Sensor
Coolant Temperature Sensor 1
The coolant temperature sensor monitors engine
coolant temperature. The output of the ECM (5) can
indicate a high coolant temperature through a relay
or a lamp. The coolant temperature sensor is used by
the ECM to determine initiation of the Cold Start
Condition.
34
SEBU8119-04
Operation Section
Sensors and Electrical Components
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