Service manual

90-898303
4-23
Cylinder Head Temperature Sensor
Two (2) temperature sensors are used to provide temperature information to
the ECM. One sensor is mounted in each 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. Should a
temperature sensor fail, the ECM will default to a temperature value of 32 °F
(0 °C).
a) Cylinder Temperature Sensor (PORT)
b) Cylinder Temperature Sensor (STARBOARD)
DDT TEST
1. Set the DDT’s data monitor to read coolant temp. Refer to the Digital
Diagnostic Terminal Technician Reference Manual for instructions.
2. If the sensor reading appears to be incorrect or invalid, perform a resistance
test on the suspected sensor.
NOTE: Refer to appropriate service manual for test procedure and
specifications.
Notes
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