Test E: Temperature Control Is Inoperative/Does Not Operate Correctly

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

Normal Operation
Under normal operation, voltage is supplied to the blend door actuator through circuit CBP27 (GN/BN). The blend door actuator is grounded through circuit GD161 (BK/YE). A 5-volt reference voltage and ground are provided by the blend door actuator to the temperature control through circuit CH449 (BU/OG) and RH449 (GY/OG). The temperature control feeds the desired position to the blend door actuator through circuit VH450 (BN/WH).

This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Temperature control potentiometer
- Temperature blend door actuator
- Stuck or bound linkage or door

E1:

E1-E3:

E4-E5:

E6-E7:

E8-E10:

E10-E11: