B10A6

B10A6-LEFT BLEND DOOR TRAVEL TOO SMALL (ATC)

Theory of Operation
The purpose of actuator calibration is to determine the total span of door travel between physical stops. To calibrate the actuator, the A/C Heater Control first moves the door to its soft stop, and then counts the number of pulses it takes to move the door to its other stop. An expected range of span is stored in the control's memory. If the measured calibration value is less than the expected range for this actuator, this DTC will set.

WHEN MONITORED
During actuator calibration.

SET CONDITION
If the total span of the Left Blend Door is less than the low range limit.

POSSIBLE CAUSES
- Left blend door seized, binding, obstructed
- Left blend door actuator
- A/C heater control

DIAGNOSTIC TEST

1. INSPECT ACTUATOR & HOUSING ASSEMBLY FOR A CONDITION CAUSING THE DOOR TO SEIZE OR BIND
Turn the ignition off.
Inspect the actuator, linkage, and housing assembly for a condition causing the door to seize or bind.

Q: Are there any physical or mechanical problems with the door, housing, linkage, or actuator?

YES: Repair as necessary. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 2

2. CHECK LEFT BLEND DOOR TRAVEL
Remove the Left Blend Door Actuator from the A/C Heater Housing Assembly.
By hand, attempt to rotate the door in both directions. The door should operate smoothly in both directions over approximately 190 degrees of travel.

Q: Does the door operate smoothly in both directions over approximately 190 degrees of travel?

YES: Replace the Left Blend Door Actuator. Then, Go To 3.
NO: Repair as necessary. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

3. RUN ACTUATOR CALIBRATION & THEN CHECK FOR DTCs IN THE A/C HEATER CONTROL
Turn the ignition on.
With the scan tool, select System Tests and then select Actuator Calibration Test. When the test is complete, select View DTCs.

Q: Does the scan tool display: B10A6-LEFT BLEND DOOR TRAVEL TOO SMALL?

YES: Replace the A/C Heater Control. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Perform BODY VERIFICATION TEST - VER 1. Body Verification Test