Test E: The Air Inlet Door Is Inoperative

PINPOINT TEST E: THE AIR INLET DOOR IS INOPERATIVE

Normal Operation
Under normal operation, to rotate the air inlet door actuator clockwise, the electronic manual temperature control (EMTC) module or electronic automatic temperature control (EATC) module supplies voltage to the air inlet air inlet door actuator motor through the circuit CH207 (BU/GY), and supplies ground through circuit CH208 (GN/OG). To rotate the air inlet door actuator counterclockwise, the EATC module reverses the voltage and ground circuits.

NOTE: EATC only.

The air inlet door actuator feedback resistor is supplied a ground from the EATC module through circuit RH111 (GY/BU) and a 5-volt reference voltage on circuit LH111 (BN/WH). The EATC module reads the voltage on the air inlet door actuator feedback circuit VH438 (GN/VT) to determine the air inlet door actuator position by the position of the actuator feedback resistor wiper arm.

- DTC B1242 Air Flow Recirculation Door Driver Circuit Failure - The module senses no change in actuator feedback voltage when the actuator motor has been energized.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Air inlet door actuator motor
- EATC module
- EMTC module
- Stuck or bound linkage or door

E1-E2:

E3-E5:

E6-E8:

E8-E10:

E10-E12:

E12-E13:

E14-E15:

E15-E16:

E17-E18:

E19: