Pinpoint Test J: The Air Inlet Door is Inoperative - EMTC
Climate Control System
Pinpoint Tests
Pinpoint Test J: The Air Inlet Door is Inoperative - EMTC
Refer to Wiring Diagram Set 54, Manual Climate Control System for schematic and connector information. Diagrams By Number
Normal Operation
To rotate the air inlet door actuator, the HVAC module supplies voltage and ground to the air inlet door actuator through the door actuator motor circuits. To reverse the air inlet door actuator rotation, the HVAC module reverses the voltage and ground circuits.
The air inlet door actuator feedback resistors are supplied a ground from the HVAC module by the air inlet door actuator return circuits and a 5-volt reference voltage on the air inlet door actuator reference circuits. The HVAC module reads the voltage on the air inlet door actuator feedback circuits to determine the air inlet door actuator position by the position of the actuator feedback resistor wiper arm.
During an actuator calibration cycle, the HVAC module drives the air inlet door until the door reaches both internal stops in the HVAC case. If the air inlet door is temporarily obstructed or binding during a calibration cycle, the HVAC module may interpret this as the actual end of travel for the door. When this condition occurs and the HVAC module commands the actuator to its end of travel, the air intake may not be from the expected source.
In FLOOR and FLOOR/DEFROST modes, the RECIRC request will time-out after 5 minutes and return to fresh air mode. RECIRC mode can be selected again after the time-out.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Air inlet mode door actuator
- HVAC module
- Stuck or bound linkage or door
PINPOINT TEST J: THE AIR INLET DOOR IS INOPERATIVE - EMTC
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J1 CHECK THE HVAC MODULE FOR DTCs
- Ignition ON.
- Check the HVAC module for DTCs.
- Are any DTCs present?
Yes
For DTC B1083:00, INSPECT for binding/damaged linkage or door. REPAIR as necessary. If no condition is found, GO to J4.
For DTC B1083:11, GO to J2.
For DTC B1083:12, GO to J3.
For DTC B11F0:11, GO to J6.
For DTC B11F0:15, GO to J9.
No
INSPECT for broken linkage or door. REPAIR as necessary. If no condition is found, GO to J13.
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J2 CHECK THE AIR INLET MODE DOOR ACTUATOR MOTOR CIRCUITS FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: HVAC Module - Electronic Manual Temperature Control (EMTC) C294A.
- Measure the resistance between ground and:
- HVAC module - EMTC C294A-2, circuit CH207 (BU/GY), harness side.
- HVAC module - EMTC C294A-3, circuit CH208 (GN/OG), harness side.
- Are the resistances greater than 10,000 ohms?
Yes
GO to J5.
No
REPAIR circuit CH207 (BU/GY) or CH208 (GN/OG) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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J3 CHECK THE AIR INLET MODE DOOR ACTUATOR MOTOR CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: HVAC Module - EMTC C294A.
- Ignition ON.
- Measure the voltage between ground and:
- HVAC module - EMTC C294A-2, circuit CH207 (BU/GY), harness side.
- HVAC module - EMTC C294A-3, circuit CH208 (GN/OG), harness side.
- Is any voltage present?
Yes
REPAIR circuit CH207 (BU/GY) 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 J5.
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J4 CHECK THE AIR INLET MODE DOOR ACTUATOR MOTOR CIRCUITS FOR AN OPEN
NOTE: Access to the connector in the following step is difficult. Before performing this step, visually inspect the actuator and its harness for obvious damage. If no damage is evident, proceed with the test.
- Ignition OFF.
- Disconnect: HVAC Module - EMTC C294A.
- Disconnect: Air Inlet Mode Door Actuator C289.
- Measure the resistance between HVAC module - EMTC C294A-2, circuit CH207 (BU/GY), harness side and air inlet mode door actuator C289-1, circuit CH207 (BU/GY), harness side.
- Measure the resistance between HVAC module - EMTC C294A-3, circuit CH208 (GN/OG), harness side and air inlet mode door actuator C289-6, circuit CH208 (GN/OG), harness side.
- Are the resistances less than 5 ohms?
Yes
GO to J13.
No
REPAIR circuit CH207 (BU/GY) or CH208 (GN/OG) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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J5 CHECK THE AIR INLET MODE DOOR ACTUATOR MOTOR CIRCUITS FOR A SHORT TOGETHER
NOTE: Access to the connector in the following step is difficult. Before performing this step, visually inspect the actuator and its harness for obvious damage. If no damage is evident, proceed with the test.
- Ignition OFF.
- Disconnect: Air Inlet Mode Door Actuator C289.
- Measure the resistance between HVAC module - EMTC C294A-2, circuit CH207 (BU/GY), harness side and HVAC module - EMTC C294A-3 , circuit CH208 (GN/OG), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to J13.
No
REPAIR circuit CH208 (GN/OG) and CH207 (BU/GY) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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J6 CHECK THE AIR INLET MODE DOOR ACTUATOR FEEDBACK CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: HVAC Module - EMTC C294A.
- Measure the resistance between ground and HVAC Module - EMTC C294A-16, circuit VH438 (GN/VT), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to J7.
No
REPAIR circuit VH438 (GN/VT) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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J7 CHECK THE SIGNAL RETURN CIRCUIT FOR A SHORT TO THE AIR INLET MODE DOOR ACTUATOR FEEDBACK CIRCUIT
NOTE: Access to the connector in the following step is difficult. Before performing this step, visually inspect the actuator and its harness for obvious damage. If no damage is evident, proceed with the test.
- Disconnect: Air Inlet Mode Door Actuator C289.
- Measure the resistance between HVAC Module - EMTC C294A-16, circuit VH438 (GN/VT), harness side and HVAC module - EMTC C294A-23, circuit RH111 (GY/BU), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to J8.
No
REPAIR circuits RH111 (GY/BU) and VH438 (GN/VT) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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J8 CHECK THE REFERENCE VOLTAGE CIRCUIT FOR AN OPEN
- Measure the resistance between HVAC Module - EMTC C294A-24, circuit LH111 (BN/WH), harness side and air inlet door actuator C289-3, circuit LH111 (BN/WH), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to J13.
No
REPAIR circuit LH111 (BN/WH) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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J9 CHECK THE AIR INLET MODE DOOR ACTUATOR FEEDBACK CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: HVAC Module - EMTC C294A.
- Ignition ON.
- Measure the voltage between ground and HVAC Module - EMTC C294A-16, circuit VH438 (GN/VT), harness side.
- Is any voltage present?
Yes
REPAIR circuit VH438 (GN/VT) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
No
GO to J10.
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J10 CHECK THE REFERENCE VOLTAGE CIRCUIT FOR A SHORT TO THE AIR INLET MODE DOOR ACTUATOR FEEDBACK CIRCUIT
NOTE: Access to the connector in the following step is difficult. Before performing this step, visually inspect the actuator and its harness for obvious damage. If no damage is evident, proceed with the test.
- Ignition OFF.
- Disconnect: Air Inlet Mode Door Actuator C289.
- Measure the resistance between HVAC Module - EMTC C294A-16, circuit VH438 (GN/VT), harness side and HVAC module - EMTC C294A-24, circuit LH111 (BN/WH), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to J11.
No
REPAIR circuits LH111 (BN/WH) and VH438 (GN/VT) for a short together. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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J11 CHECK THE AIR INLET MODE DOOR ACTUATOR FEEDBACK CIRCUIT FOR AN OPEN
- Measure the resistance between HVAC Module - EMTC C294A-16, circuit VH438 (GN/VT), harness side and air inlet door actuator C289-4, circuit VH438 (GN/VT), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to J12.
No
REPAIR circuit VH438 (GN/VT) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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J12 CHECK THE AIR INLET MODE DOOR ACTUATOR RETURN CIRCUIT FOR AN OPEN
- Measure the resistance between HVAC Module - EMTC C294A-23, circuit RH111 (GY/BU), harness side and air inlet door actuator C289-2, circuit RH111 (GY/BU), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to J13.
No
REPAIR circuit RH111 (GY/BU) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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J13 CHECK THE AIR INLET MODE DOOR ACTUATOR CONNECTION
- Disconnect the air inlet mode door actuator connector.
- Inspect the air inlet mode door actuator connector for:
- corrosion
- pushed-out terminals
- damaged terminals
- Connect and correctly seat the actuator connector.
- Clear the DTCs.
- Enter the following diagnostic mode on the scan tool: Self-Test - HVAC Module.
- 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. If the actuator tests OK, GO to J14. When installing an actuator, CONNECT the actuator electrical connector before the HVAC module connector(s). This allows the actuator to be calibrated when the HVAC module is reconnected. Climate Control System
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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J14 MODULE ACTUATOR POSITION CALIBRATION
NOTE: The purpose of the module actuator position calibration is to allow the HVAC module to reinitialize and calibrate the actuator stop points. To carry out the calibration, follow the steps below.
- Ignition OFF.
- Inspect the HVAC module connectors for:
- corrosion
- pushed-out terminals
- damaged terminals
- Connect and correctly seat all the HVAC module connectors.
- Ignition ON.
- Clear the DTCs.
- Enter the following diagnostic mode on the scan tool: Self-Test - HVAC Module.
- Select any position except OFF.
- NOTE: The HVAC module will now initialize and calibrate the actuators. Calibration of the actuators takes approximately 30 seconds.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new HVAC module. REFER to Climate Control Service and Repair. TEST the system for normal operation.
No
The system is now operating correctly at this time. The concern may have been caused by a foreign object in the HVAC case or temporary binding that restricted actuator door travel. CHECK any actuator external linkage. If condition recurs, INSPECT actuator linkage and door for binding and CHECK HVAC case for foreign objects.
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