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Home >> Ford >> 2006 >> Ranger 2WD V6-4.0L VIN E >> Repair and Diagnosis >> Heating and Air Conditioning >> Testing and Inspection >> Pinpoint Tests >> Test E: The Temperature Control Is Inoperative/Does Not Operate Correctly
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Test E: The Temperature Control Is Inoperative/Does Not Operate Correctly

PINPOINT TEST E: THE TEMPERATURE CONTROL IS INOPERATIVE/DOES NOT OPERATE CORRECTLY


E1:






E1-E3:






E4-E5:






E6-E7:






E8-E10:






E10-E11:






Normal Operation
Under normal operation, voltage is supplied to the blend door actuator through circuit 1003 (GY/YE). The blend door actuator is grounded through circuit 57 (BK). A 5-volt reference voltage and ground are provided by the blend door actuator to the temperature control through circuit 436 (RD/LG) and 438 (RD/WH). The temperature control feeds the desired position to the blend door actuator through circuit 437 (YE/LG).

Possible Causes
- Fuse
- An open in circuit 57 (BK), 436 (RD/LG), 437 (YE/LG), 438 (RD/WH) or 1003 (GY/YE)
- A short to ground in circuit 436 (RD/LG) or 437 (YE/LG)
- A short to voltage in circuit 436 (RD/LG) or 437 (YE/LG)
- A short together in circuits 436 (RD/LG), 437 (YE/LG) or 438 (RD/WH)
- Temperature control potentiometer
- Temperature blend door actuator
- Stuck or bound linkage or door
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