Test D: The Electric Cooling Fan(s) Is Inoperative/Does Not Operate Correctly

Test D: The Electric Cooling Fan(s) Is Inoperative/Does Not Operate Correctly

Refer to Vehicle/Diagrams for schematic and connector information.

Normal Operation
Under normal operation in low speed, the LH fan only is in operation. Voltage is supplied to the LH cooling fan relay through circuit 1822 (LB). When the relay is energized, voltage is fed to the LH cooling fan motor through circuit 538 (GY/RD). Ground for the cooling fan motor is provided through circuit 57 (BK).

Under normal operation in medium speed, both fans are in operation. Voltage is supplied to the RH low and LH cooling fan relays through circuit 1823 (YE/BK). When the relay is energized, voltage is fed to the RH cooling fan resister through circuit 3829 (LB/BK), then to the RH cooling fan motor through circuit 229 (RD/OG). Ground for the cooling fan motor is provided through circuit 57 (BK).

Under normal operation in high speed, both fans are in operation. Voltage is supplied to the RH high speed and LH cooling fan relays through circuit 1823 (YE/BK). When the relay is energized, voltage is fed to the RH cooling fan motor through circuit 229 (RD/OG), bypassing the RH cooling fan resister. Ground for the cooling fan motor is provided through circuit 57 (BK).

Possible Causes
^ An open circuit 1823 (YE/BK), 1822 (LB), 538 (GY/RD), 3829 (LB/BK), 229 (RD/OG) or 57 (BK)
^ A short to voltage on circuit 538 (GY/RD), 3829 (LB/BK) or 229 (RD/OG)
^ Cooling fan relay
^ Cooling fan motor
^ Cooling fan resister

NOTE: Before carrying out the following test, diagnose any PCM DTCs.

D1-D2:

D2-D4:

D4-D6:

D6-D7: