B1344

DTC B1344

CIRCUIT DESCRIPTION
- DTC B1340 - Left Air Temperature Actuator
- DTC B1341 - Right Air Temperature Actuator
- DTC B1343 - Recirculation Actuator
- DTC B1344 - Mode Actuator

The HVAC control module (IPM) commands the actuator to move by controlling the voltage supplied on the control circuit. A low voltage of 0 volts moves the door in one direction. A voltage of 2.5 volts stops the door. A high voltage of 5 volts moves the door in the opposite direction. The IPM 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.

CONDITIONS FOR RUNNING THE DTC
The ignition is turned ON.

CONDITIONS FOR SETTING THE DTC
The IPM 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 IPM in an attempt to maintain actuator operation.

CONDITIONS FOR CLEARING THE DTC
- The DTC will become history if the IPM 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 actuator to travel to its internal stops (overtravel condition).
- Refer to Diagnostic Aids for Circuit Testing and Wiring Repair procedures.

TEST DESCRIPTION

Steps 1-2:

Steps 3-4:

Steps 6-11:

Steps 12-15:

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.