IGNITION
Page 2A-8 90-855347R1 JANUARY 1999
Temperature Sensor
Two (2) temperature sensors are used to provide cylinder head temperature information
to the ECM. One sensor is mounted in the starboard cylinder head and one in the air com-
pressor 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 en-
gine at temperature (F) indicated, ohm readings should be as indicated ±10%.
0
15
30
45
60
75
90
105
120
135
150
165
180
195
210
225
240
255
270
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2
Resistance (k)
Temperature (F)
Temperature Sensor
Temperature Sensor(s)
Between Black and each TAN/BLK wire. No Continuity
Between each lead and ground No Continuity
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