B1341

Schematic:

CIRCUIT DESCRIPTION
The heater and A/C programmer supplies voltage to an internal motor that drives the air mix door. The heater and A/C programmer monitors the air mix door position feedback from a sensor on the motor. If the air mix door is requested to move but the feedback voltage does not change, the heater and A/C programmer will store DTC B1341. If the air mix door feedback indicates that the feedback is near the hot or cold extreme, the DTC will not set. Evaluate the operation of the air mix door through self diagnostics as described in the test description.

CONDITIONS FOR RUNNING THE DTC
^ The commanded air mix door is greater than 0%.
^ The commanded air mix door is less than 76%.

FAILURE CONDITIONS
The actual air mix door is not within 3% of the commanded air mix door position within approximately 60 seconds.

NOTES ON INTERMITTENCE
If an intermittent DTC B1341 is set, complete the following steps:
1. Connect a Scan Tool.
2. Select the snapshot data for the air mix door #2.
3. Note the value of the feedback and commanded position.
3.1. Use a Scan Tool override while monitoring the feedback value. Command the door to the high and low positions.
3.2. Without keying OFF, physically inspect the air mix door linkage for any obstruction at these positions.

TEST DESCRIPTION

Steps 1-10:

1. Perform the Diagnostic System Check before continuing with the diagnosis of this DTC.
2. A Scan Tool allows for the direct control of the air mix door by observing the following conditions:
^ The air mix door position sensor feedback value
^ The value's difference from the air mix door commanded position value
3. These readings indicate a fault internal to the heater and A/C programmer in the air mix door sensor feedback.