Pinpoint Test G: The Air Inlet Door is Inoperative
Climate Control System
Pinpoint Test G: The Air Inlet Door is Inoperative
Refer to Wiring Diagram Set 54, Manual Climate Control System for schematic and connector information Electrical Diagrams.
Normal Operation
The HVAC module supplies voltage and ground to the air inlet mode door actuator through the actuator motor circuits to rotate the air inlet mode door actuator. To reverse the air inlet mode door actuator rotation, the HVAC module reverses voltage and ground on the circuits.
When the HVAC is in FLOOR/DEFROST or FLOOR mode, RECIRC is a timed function. When RECIRC is selected, the air inlet mode door remains in recirculated air mode for 5 minutes. After 5 minutes, the RECIRC indicator turns off and the air inlet mode door changes to fresh air mode.
- DTC 4-2 (Recirculation Motor Driver Circuit/Performance)- This DTC sets when either of the following occurs:
- The module senses lower than expected voltage on an actuator motor circuit when voltage is applied to drive the motor, indicating a short to ground.
- The module senses greater than expected voltage on the actuator motor circuit when ground is applied to drive the motor, indicating a short to voltage.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Air inlet mode door actuator
- HVAC module
- Air inlet mode door binding or stuck
PINPOINT TEST G : THE AIR INLET DOOR IS INOPERATIVE
G1 CHECK THE HVAC MODULE FOR DTCs
- Ignition ON.
- CARRY OUT the HVAC module self-test.
- Check for HVAC DTCs retrieved during the self-test.
Is DTC 4-2 present?
Yes
GO to G2.
No
GO to G6.
G2 CHECK THE AIR INLET MODE DOOR ACTUATOR MOTOR CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: HVAC Module C228A.
- Ignition ON.
- Measure the voltage between ground and:
- HVAC module C228A-9, circuit CH206 (YE/VT), harness side.
- HVAC module C228A-18, circuit CH208 (GN/OG), harness side.
Are any voltages present?
Yes
REPAIR circuit CH206 (YE/VT) or CH208 (GN/OG) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
GO to G3.
G3 CHECK THE AIR INLET MODE DOOR ACTUATOR MOTOR CIRCUITS FOR A SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between ground and:
- HVAC module C228A-9, circuit CH206 (YE/VT), harness side.
- HVAC module C228A-18, circuit CH208 (GN/OG), harness side.
Are the resistances greater than 10,000 ohms?
Yes
GO to G4.
No
REPAIR circuit CH206 (YE/VT) or CH208 (GN/OG) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
G4 CHECK THE AIR INLET MODE DOOR ACTUATOR MOTOR RESISTANCE
- Measure the resistance between HVAC module C228A-9, circuit CH206 (YE/VT), harness side and HVAC module C228A-18, circuit CH208 (GN/OG), harness side.
Is the resistance greater than 30 ohms?
Yes
GO to G8.
No
GO to G5.
G5 CHECK THE AIR INLET MODE DOOR ACTUATOR MOTOR CIRCUITS FOR A SHORT TOGETHER
- Disconnect: Air Inlet Mode Door Actuator C289.
- Measure the resistance between HVAC module C228A-9, circuit CH206 (YE/VT), harness side and HVAC module C228A-18, circuit CH208 (GN/OG), harness side.
Is the resistance greater than 10,000 ohms?
Yes
INSTALL a new air inlet actuator. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
REPAIR circuits CH208 (GN/OG) and CH206 (YE/VT) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
G6 CHECK THE AIR INLET MODE DOOR ACTUATOR MOTOR CIRCUITS FOR AN OPEN
- Ignition OFF.
- Disconnect: HVAC Module C228A.
- Disconnect: Air Inlet Mode Door Actuator C289.
- Measure the resistance between HVAC module C228A-18, circuit CH208 (GN/OG), harness side and air inlet mode door actuator C289-1, circuit CH208 (GN/OG), harness side.
- Measure the resistance between HVAC module C228A-9, circuit CH206 (YE/VT), harness side and air inlet mode door actuator C289-6, circuit CH206 (YE/VT), harness side.
Are the resistances less than 5 ohms?
Yes
GO to G7.
No
REPAIR circuit CH206 (YE/VT) or CH208 (GN/OG) for an open. TEST the system for normal operation.
G7 CHECK THE AIR INLET MODE DOOR AND LINKAGE
- Disconnect: Air Inlet Mode Door Actuator C289.
- REMOVE the air inlet mode door actuator.
- INSPECT the air inlet mode door and linkage for a broken, loose or binding condition.
Is any binding condition found during inspection?
Yes
REPAIR the air inlet mode door or linkage TEST the system for normal operation.
No
GO to G8.
G8 CHECK THE AIR INLET MODE DOOR ACTUATOR CONNECTION
- Disconnect the air inlet mode door actuator connector.
- Inspect the air inlet door actuator connector for:
- corrosion.
- pushed-out terminals.
- damaged terminals.
- Connect and correctly seat the actuator connector.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes
CARRY OUT the Air Inlet Mode Door Actuator component test Component Tests. INSTALL a new air inlet mode door if necessary. If the actuator tests OK, GO to G9.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation.
G9 CHECK THE HVAC MODULE CONNECTION
- Disconnect all the HVAC module connectors.
- Inspect the HVAC module connectors for:
- corrosion.
- pushed-out terminals.
- damaged terminals.
- Connect and correctly seat all the HVAC module connectors.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new HVAC module. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation.