B11CD-00-MAIN/LEFT TEMPERATURE DOOR TRAVEL TOO LARGE
For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation
After the initial installation of the A/C Heater Control, the controller is calibrated to each individual blend/mode door actuator. These calibrations are stored as in the number of pulses it takes to move the door from one stop to another. The A/C Heater Control drives the Door Actuators by the use of Door Driver circuit and a Common Door Driver circuit and monitors all door actuator pulses to detect door movement in both directions. Most of the door actuators share a common door driver circuit but each door actuator has its own unique driver circuit. Due to shared circuitry, similar Diagnostic trouble Codes (DTCs) can set at the same time for multiple actuators depending upon the type of circuit malfunction, its location, and the direction the actuator is moving when the malfunction is present.
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When Monitored:
When ever an Actuator Calibration Test is performed.
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Set Condition:
The A/C Heater Control uses a pulse feedback to the controller to detect the total door movement range. If the amount of pulses required to move the door completely in both directions is greater than what the controller has stored in its memory, this DTC will set. If an Actuator Calibration Test is performed or during normal operation and the A/C Heater Control detects a valid range of the door movement span in both directions, the DTC will change from Active to Stored and will stay in the controllers memory for 100 ignition cycles.
Possible Causes |
|---|
| RELATED DTCS PRESENT |
| BLEND DOOR STOPS |
| BLEND DOOR |
| BLEND DOOR ACTUATOR |
| A/C HEATER CONTROL |
Always perform the HVAC Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/HVAC - Standard Procedure) .
| 1. | Ignition on, engine not running. |
| 2. | With the scan tool, read HVAC DTCs. |
Are there any Door Control Circuit Short to Voltage, Short to Ground or Open DTCs present?
Yes
- (Refer to 28 - DTC-Based Diagnostics/HVAC - Diagnosis and Testing) and perform the appropriate diagnostic procedure.
No
- Go To 2
| 1. | Ignition on, engine not running. |
| 2. | With the scan tool, read HVAC DTCs. |
Is this DTC active?
Yes
- Go To 4
No
- Go To 3
3. PERFORM HVAC ACTUATOR CALIBRATION TEST
| 1. | With the scan tool, perform the HVAC Actuator Calibration Test. |
Did this DTC change from Stored to Active while performing the HVAC System Test?
Yes
- Go To 4
No
- Go To 6
| 1. | Remove the Blend Door Actuator and check the Blend Door stops, linkage (stripped or cracked) and door. |
Were there any problems found?
Yes
- Repair or replace the Blend Door as necessary in accordance with the Service Information.
- Perform the HVAC VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/HVAC - Standard Procedure) .
No
- Go To 5
5. CHECK THE BLEND DOOR ACTUATOR
| 1. | Replace the Blend Door Actuator in accordance with the Service Information. |
| 2. | With the scan tool, erase HVAC DTCs and perform the HVAC Actuator Calibration Test. |
Did this DTC reset?
Yes
- Replace and program the A/C Heater Control in accordance with the Service Information.
- Perform the HVAC VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/HVAC - Standard Procedure) .
No
- Test complete.
- Perform the HVAC VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/HVAC - Standard Procedure) .
6. CHECK THE WIRING AND CONNECTORS
| 1. | The conditions necessary to set the DTC are not present at this time. |
| 2. | With the scan tool, check the Environmental Data to help identify the conditions in which the DTC was set. |
| 3. | Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. |
| 4. | Wiggle the wiring and connectors while checking for shorted and open circuits. |
Were there any problems found?
Yes
- Repair as necessary.
- Perform the HVAC VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/HVAC - Standard Procedure) .
No