Diagnostic Aids

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

The range fault code can only be detected following a check of the air temperature actuator travel range. The air temperature actuator travel range check can only be initiated by disrupting power to the HVAC control module or with the scan tool.
The calibration limit is 147-220 counts (2.9-4.4 V). An actual range below this limit suggests an obstruction, something stuck in the door limiting travel. An actual range above this limit suggests an over travel condition, damaged or missing foam seals.
If condition not present, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

DTC B0441 or B0446

Step	Action	Values	Yes	No
Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views
1	Did you perform the HVAC Diagnostic System Check?	-	Go to Step 2	Go to Diagnostic System Check - HVAC Systems - Automatic
2	Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, command the appropriate Mix Motor ON and OFF to display the maximum and the minimum counts of the appropriate Mix Motor Position Feedback in the Heating and Air Conditioning, Special Functions, Miscellaneous Test list. Subtract the minimum appropriate Mix Motor Position Feedback from the maximum appropriate Mix Motor Position Feedback. Does the result of the calculation indicate that the actual travel of the appropriate air temperature actuator is within the specified range?	147-220 counts	Go to Diagnostic Aids	Go to Step 3
3	Test the ignition 3 voltage circuit of the appropriate air temperature actuator for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 13	Go to Step 4
4	Test the air temperature door control circuit of the appropriate air temperature actuator for an open, high resistance, short to ground or short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 13	Go to Step 5
5	Test the 5 volt reference circuit of the appropriate air temperature actuator for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 13	Go to Step 6
6	IMPORTANT: The appropriate air temperature actuator connector and the HVAC control module connector must be connected to correctly perform test. Turn ON the ignition, with the engine OFF. With the scan tool, observe the appropriate Mix Motor Position Feedback data parameter. Connect a 3 amp fused jumper wire between the air temperature door control circuit and the 5 volt reference circuit of the appropriate air temperature actuator. This action drives the actuator to the full HOT position, for the left air temperature actuator, or full COLD for the right air temperature actuator. Remove and reconnect the jumper wire between the air temperature door control circuit and the low reference circuit of the appropriate air temperature actuator. This action drives the actuator to the full COLD position, for the left air temperature actuator, or full HOT for the right air temperature actuator. Does the appropriate air temperature actuator drive shaft rotate and do the counts change?	-	Go to Step 7	Go to Step 9
7	Measure the voltage from the temperature door control circuit of the appropriate air temperature actuator to a good ground. With a scan tool, command the appropriate Temp Door Position from Hot to Cold. Does the voltage measure near the specified value when increasing temperature, near the specified value when decreasing temperature and near the specified value when stationary?	0 V decreasing 5 V increasing 2.5 V stationary	Go to Step 8	Go to Step 10
8	Inspect the appropriate air temperature door and the appropriate air temperature actuator for the following conditions: A misaligned air temperature actuator Refer to Air Temperature Actuator Replacement - Left or Air Temperature Actuator Replacement - Right A broken or binding linkages or air temperature door An obstruction that prevents the air temperature door from operating within its full range of motion Missing seals to the air temperature door Misaligned seals to the air temperature door Did you find and correct the condition?	-	Go to Step 13	Go to Diagnostic Aids
9	Inspect for poor connections at the harness connector of the appropriate air temperature actuator. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 13	Go to Step 11
10	Inspect for poor connections at the harness connector of the HVAC control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 13	Go to Step 12
11	IMPORTANT: Perform the recalibration procedure for the appropriate air temperature actuator. Replace the appropriate air temperature actuator. Refer to Air Temperature Actuator Replacement - Left or Air Temperature Actuator Replacement - Right .Did you complete the replacement?	-	Go to Step 13	-
12	IMPORTANT: Perform the recalibration procedure for the HVAC control module. Replace the HVAC control module. Refer to HVAC Control Module Replacement .Did you complete the replacement?	-	Go to Step 13	-
13	Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC reset?	-	Go to Step 2	System OK