Diagnostic Routine J

Diagnostic Routine J

Diagnostic Overview

The Air Inlet Door Is Inoperative

Refer to Wiring Diagram Set 55 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

REFER to Mode Door Actuator - Air Inlet Door.

During an actuator calibration cycle, the HVAC (Heating, Ventilation, and Air Conditioning) module drives the air inlet mode door until the door reaches both internal stops in the HVAC (Heating, Ventilation, and Air Conditioning) case. If the air inlet mode door is temporarily obstructed or binding during a calibration cycle, the HVAC (Heating, Ventilation, and Air Conditioning) module may interpret this as the actual end of travel for the door. When this condition occurs and the HVAC (Heating, Ventilation, and Air Conditioning) module commands the actuator to its end of travel, the air intake may not be from the expected source.

DTC Fault Trigger Conditions






Pinpoint Test

1. CHECK THE AIR INLET MODE DOOR ACTUATOR CIRCUITS FOR AN OPEN

1. Ignition OFF.

2. Disconnect: HVAC (Heating, Ventilation, and Air Conditioning) Module C228A.

3. Disconnect: Air Inlet Mode Door Actuator.

4. Measure:





Are the resistances less than 3 ohms?






2. CHECK THE AIR INLET MODE DOOR ACTUATOR CIRCUITS FOR A SHORT TO GROUND

1. Measure:





Are the resistances greater than 10,000 ohms?






3. CHECK THE AIR INLET MODE DOOR ACTUATOR CIRCUITS FOR A SHORT TO POWER

1. Ignition ON.

2. Measure:





Is there any voltage present?






4. CHECK FOR CORRECT HVAC (Heating, Ventilation, and Air Conditioning) MODULE OPERATION

1. Ignition OFF.

2. Disconnect and inspect all the HVAC (Heating, Ventilation, and Air Conditioning) module connectors.

3. Repair:

- corrosion (install new connector or terminals- clean module pins)
- damaged or bent pins- install new terminals/pins
- pushed-out pins- install new pins as necessary

4. Reconnect the HVAC (Heating, Ventilation, and Air Conditioning) module connectors. Make sure they seat and latch correctly.

5. Operate the system and determine if the concern is still present.

Is the concern still present?