Test E: Incorrect/Erratic Direction of Airflow From Outlet(s)

PINPOINT TEST E: INCORRECT/ERRATIC DIRECTION OF AIRFLOW FROM OUTLET(S)

E1-E2:

E3-E5:

E5-E7:

E7-E9:

E9-E11:

E11-E13:

E13-E14:

E14-E15:

E15-E16:

E17-E18:

Normal Operation
Under normal operation, to rotate the mode door actuator, the EMTC module or EATC module supplies voltage to the Floor/Defrost/Panel mode door actuator motor through the circuit CH229 (WH/BU), and supplies ground through circuit CH228 (YE/GY). To reverse the mode door actuator rotation, the EMTC module or EATC module reverses the voltage and ground circuits.

The mode door actuator feedback resistor is supplied a ground from the EMTC module or EATC module through circuit RH111 (GY/BU) and a 5-volt reference voltage on circuit LH111 (BN/WH). The EMTC module or EATC module reads the voltage on the mode door actuator feedback circuit VH436 (YE/VT) to determine the mode door actuator position, by the position of the actuator feedback resistor wiper arm.

Possible Causes
- An open, short to voltage, ground or together in circuits CH228 (YE/GY), CH229 (WH/BU), RH111 (GY/BU), LH111 (BN/WH) and VH436 (YE/VT)
- Floor/defrost/panel mode door actuator motor
- EATC module
- EMTC module
- Stuck or bound linkage or door