service manual.vp - eTundra
service manual.vp - eTundra
service manual.vp - eTundra
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Test Procedures - Loads<br />
Water Pump<br />
1. Test using the controller’s indicator lights. Check the indicator light during the freeze cycle.<br />
The light will be On for all but the 30 second anti-slush period, so observe the light for one<br />
minute. When it is On, check the water pump, it should be operating. If not, check voltage to<br />
the pump. If low check the voltage from the controller to ground. The water pump pin is<br />
number 6. If there is voltage at that pin to ground, but very low voltage at the pump motor,<br />
there must be a broken wire in the harness. If the voltage is low at pin 6, the controller should<br />
be replaced.<br />
2. Test using an ohmmeter. Disconnect electrical power. Unplug the water pump motor leads<br />
from the harness. Measure the resistance of the motor windings. If open, replace the pump.<br />
Measure resistance to ground. If there is any, replace the pump.<br />
Water pump light is ON when<br />
pump is in operation.<br />
September 2006 Page 65
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