B1341

CIRCUIT DESCRIPTION
The HVAC control processor commands the right air temperature actuator to move by controlling the voltage supplied on the control circuit. A low voltage of 0 volts moves the door toward full hot. 2.5 volts stops the motor. 5 volts moves toward full cold. The HVAC control processor determines the current position of the actuator by monitoring the voltage on the signal circuit. The feedback potentiometer is a function of the motor position. A high voltage of 4-5 volts indicates full cold door position. A low voltage of less than 1 volt indicates full hot door position. The HVAC control processor controls the right air temperature actuator door positions in order to maintain the selected air temperature.

CONDITIONS FOR RUNNING THE DTC
The ignition is turned ON.

CONDITIONS FOR SETTING THE DTC
The HVAC control processor detects the signal circuit is less than 5 counts (0.09 V) or greater than 250 counts (4.90 V).

ACTION TAKEN WHEN THE DTC SETS
A default value will be used for the sensor data by the HVAC control processor in an attempt to maintain the air temperature selected by the driver.

CONDITIONS FOR CLEARING THE DTC
The DTC will become history if the HVAC control processor no longer detects a failure.
^ The history DTC will clear after 50 fault-free ignition cycles.
^ The DTC can be cleared with a scan tool.

DIAGNOSTIC AIDS
Check the following conditions:
^ A disconnected or broken door may also set this DTC by allowing the right air temperature actuator to travel to its internal stops (overtravel condition).
^ If the condition is not present, refer to Testing for Intermittent and Poor Connections in Diagrams.

TEST DESCRIPTION

Steps 1-9:

Steps 10-15:

The numbers below refer to the step numbers on the diagnostic table.
3. Tests for the proper operation of the circuit in the high voltage range.
4. Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to voltage.
5. Tests for a short to ground in the 5 volt reference circuit.