Circuit Description
The recirculation actuator is an electronic stepper motor with a feedback potentiometer. The instrument panel integrated module (IPM) determines the position of the recirculation door based on the voltage from the potentiometer. When the airflow is being recirculated, the voltage is low. When outside air is being admitted, voltage is high. The IPM controls the recirculation door in either the recirculation or the outside air position as selected by the vehicle occupants.
Conditions for Running the DTC
The ignition is turned ON.
Conditions for Setting the DTC
The IPM detects the signal is less than 5 counts (0.1 V ) or greater than 250 counts (4.9 V).
Action Taken When the DTC Sets
| • | The recirculation door will be set to the outside air position. |
| • | If B0272 sets during a calibration/recalibration event the IPM will no longer issue commands to the actuator and will not perform a calibration/recalibration until the door position feedback fault is corrected. |
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
A disconnected or broken door/linkage may also set this DTC during calibration/recalibration by allowing the actuator to travel to its minimum internal stop (over travel condition).
Test Description
The numbers below refer to the step numbers on the diagnostic table. If the condition is not present, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
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Tests for the proper operation of the circuit in the high voltage range.
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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.
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Tests for a short to ground in the 5 volt reference circuit.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: HVAC Schematics | ||||
1 | Did you perform the HVAC Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Does the scan tool indicate that the Air Inlet Dr Actual parameter is within the specified range? | 13-250 counts (0.25-4.90 V) | Go to Diagnostic Aids | Go to Step 3 |
Does the scan tool indicate that the Air Inlet Dr Actual parameter is greater than the specified value? | 250 counts (4.9 V) | Go to Step 4 | Go to Step 8 | |
Does the scan tool indicate that the Air Inlet Dr Actual parameter is less than the specified value? | 13 counts (0.25 V) | Go to Step 5 | Go to Step 9 | |
Does the scan tool indicate that the Air Inlet Dr Actual parameter is greater than the specified value? | 250 counts (4.9 V) | Go to Step 7 | Go to Step 6 | |
6 | Test the 5 volt reference circuit of the recirculation actuator for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 13 |
7 | Test the 5 volt reference circuit of the recirculation actuator for a short to voltage, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 11 |
8 | Test the recirculation door position signal circuit of the recirculation actuator for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 13 |
9 | Test the recirculation door position signal circuit of the recirculation actuator sensor for a short to voltage, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 10 |
10 | Test the low reference circuit of the recirculation actuator for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 13 |
11 | Inspect the recirculation door and the recirculation actuator for the following conditions:
Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 12 |
12 | Inspect for poor connections at the harness connector of the recirculation 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 16 | Go to Step 14 |
13 | Inspect for poor connections at the harness connector of the IPM. 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 16 | Go to Step 15 |
14 |
Important: Perform the recalibration procedure for the recirculation actuator. Replace the recirculation actuator. Refer to Recirculation Actuator Replacement . Did you complete the replacement? | -- | Go to Step 16 | -- |
15 |
Important: Perform the recalibration procedure for the instrument panel integration module (IPM) Replace the IPM. Refer to Instrument Panel Module Replacement in Body Control System. Did you complete the replacement? | -- | Go to Step 16 | -- |
16 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
