Filter
Top Products
10.26
ELECTRICAL
Coolant Temperature Sensor
The coolant temperature sensor can be tested using an ohmmeter
or voltmeter.
If the ECT circuit is open the engine Hot light and fan will both
come on. With engine at an ambient temperature of 68
F
(20
C), disconnect lead and measure the resistance of sensor
between the two ECT terminals and compare to the specification
listed.
1. With the engine and temperature sensor at room
temperature (68
F = 20C), disconnect the harness
connector.
2. With the meter in the ohms mode, place the meter leads
onto the sensor contacts.
3. Use the Temperature / Resistance table to determine if the
sensor needs to be replaced.
NOTE: If the coolant temperature sensor or circuit
malfunctions the radiator fan will default to 'ON'.
NOTE: The fan may not function or operation may
be delayed if coolant level is low or if air is trapped in
the cooling system. Be sure cooling system is full
and purged of air. Refer to Maintenance Chapter 2
for cooling system information.
GEAR POSITION INDICATOR SWITCH
Test Diagram
Table 10-1:
TEMPERATURE F (C) RESISTANCE
68F (20 C) 37.3 k
212F (100 C) 2.1 k
NOTE: Also see “INSTRUMENT CLUSTER
TROUBLESHOOTING” for gear switch resistance.
High Range
Low Range
Neutral
Reverse
Park
Orange/Red
Violet (purple)
Green/White
Brown/Red
White/Blue
Blue/Red
TRANSMISSION SWITCH
High/Low/Neutral/Reverse/Park