Circuit Description
The left temp door motor is an electronic actuator stepper motor with a feedback potentiometer. The IPM determines the position of the door motor based on the voltage from the potentiometer. When the airflow is cool (heater core bypass), the voltage is high. When the airflow is warm (through the heater core), the voltage is low. The IPM controls the left temp door motor position to maintain the air temperature selected by the driver.
Conditions for Running the DTC
The ignition is turned ON.
Conditions for Setting the DTC
The IPM detects the signal circuit is less than 0.05 V (3 counts) or greater than 4.90 V (250 counts).
Action Taken When the DTC Sets
| • | A default value of 2.50 V (128 counts) will be used for the sensor data by the IPM. |
| • | The IPM will toggle the actuator between full hot and full cool in an attempt to maintain the air temperature selected by the driver. |
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 may also set this DTC by allowing the actuator to travel to its internal stops (overtravel condition). |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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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 |
|---|---|---|---|---|
1 | Did you perform the HVAC Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check |
2 |
Does the scan tool indicate that the Left Temp Dr Actual parameter is within the specified range? | 0.05 V-4.90 V | Go to Diagnostic Aids | Go to Step 3 |
3 |
Does the scan tool indicate that the Left Temp Dr Actual parameter changes when the Left Temp Door is commanded from Hot to Cold? | -- | Go to Step 12 | Go to Step 4 |
Does the scan tool indicate that the Left Temp Dr Actual parameter is greater than the specified value? | 4.90 V | Go to Step 5 | Go to Step 9 | |
Does the scan tool indicate that the Left Temp Dr Actual parameter is less than the specified value? | 0.05 V | Go to Step 6 | Go to Step 10 | |
Does the scan tool indicate that the Left Temp Dr Actual parameter is greater than the specified value? | 4.90 V | Go to Step 8 | Go to Step 7 | |
7 | Test the 5-volt reference circuit of the left temp door position sensor 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 17 | Go to Step 14 |
8 | Test the 5-volt reference circuit of the left temp door position 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 17 | Go to Step 13 |
9 | Test the signal circuit of the left temp door position sensor 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 17 | Go to Step 14 |
10 | Test the signal circuit of the left temp door position 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 17 | Go to Step 11 |
11 | Test the ground circuit of the left temp door position sensor 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 17 | Go to Step 14 |
12 | Inspect the air mix door for a condition allowing excessive travel of the actuator. Did you find and correct the condition? | -- | Go to Step 17 | Go to Step 13 |
13 | Inspect for poor connections at the harness connector of the driver air mix 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 17 | Go to Step 15 |
14 | 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 17 | Go to Step 16 |
15 | Replace the driver air mix actuator. Refer to Air Mix Actuator Replacement - Driver . Did you complete the replacement? | -- | Go to Step 17 | -- |
16 | Replace the IPM. Refer to Instrument Panel Module Replacement in Body Control System. Did you complete the replacement? | -- | Go to Step 17 | -- |
17 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
