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MC0322 through MC2148
Air, Water, and Remote Cooled Service Manual
Test Procedures -
Water Pump
1. Test using the controller's indicator lights. Check the indicator light during the freeze cycle. The light will
be On for all but the 30 second anti-slush period, so observe the light for one minute. When it is On, check
the water pump, it should be operating. If not, check voltage to the pump. If low check the voltage from the
controller to ground. The water pump pin is number 6. If there is voltage at that pin to ground, but very low
voltage at the pump motor, there must be a broken wire in the harness. If the voltage is low at pin 6, the
controller should be replaced.
2. Test using an ohmmeter. Disconnect electrical power. Unplug the water pump motor leads from the harness.
Measure the resistance of the motor windings. If open, replace the pump. Measure resistance to ground. If
there is any, replace the pump.
Water Pump light is
ON when pump is
operating.
January 2022
Page 52
8 - Fan Motor
Brown
Red
7 - Inlet Water Sol
White
Blue
6 - Water Pump
Brown
5 - Hot Gas Valve
White
4 - Compressor
Yellow
3 - Purge Valve
Red
Black
1 - Line In
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