12
Test Procedures
TROUBLESHOOTING AND ELECTRICAL
SYSTEM: DIESEL VEHICLES
WARNING
• Hot! Coolant system is pressurized. Do not remove thermostat switch while engine is hot.
3.
Disconnect the two-pin connector between the thermostat switch and the wire harness
4.
Test for failed switches in closed condition.
4.1.
Set a multimeter to 200 ohms.
4.2.
Use an alligator clip to connect the black (–) probe of the multimeter to the frame (ground).
4.3.
Use an alligator clip to connect the red (+) probe of the multimeter to the white wire terminal.
4.4.
The multimeter should indicate an over limit (no continuity) at room temperature. If the multimeter indicates
continuity at room temperature, replace the thermostat switch.
See Thermostat Switch Removal on
4.5.
Leave the black (–) probe of the multimeter connected to the frame (ground). Use an alligator clip to
connect the red (+) probe of the multimeter to the black wire terminal.
4.6.
The multimeter should indicate an over limit (no continuity) at room temperature. If the multimeter indicates
continuity at room temperature, replace the thermostat switch.
See Thermostat Switch Removal on
G
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A
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1
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9
5
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7
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2115
Figure 12-16
Thermostat Switch
5.
Unscrew the thermostat switch from the engine block.
See preceding WARNING.
6.
Test the fan control thermostat switch.
6.1.
Place the thermostat switch in a kitchen pot as shown
.
6.2.
Set a multimeter to 200 ohms.
6.3.
Use an alligator clip to connect the black (–) probe to the thermostat switch housing.
6.4.
Use an alligator clip to connect the red (+) probe to the white wire terminal.
6.5.
The multimeter should indicate an over limit (no continuity) at room temperature. If the multimeter indicates
continuity at room temperature, replace the thermostat switch.
See Thermostat Switch Removal on
6.6.
Fill the kitchen pot with water so that approximately half of the thermostat housing is submerged as shown
.
6.7.
Place the kitchen pot on a stove and bring the water to a boil.
See following WARNING.
Page 12-22
2016 Carryall 1500/1700 and XRT 1550 Maintenance and Service Manual
Summary of Contents for Carryall 1500 2016
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