Test Description
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Value(s) | Yes | No | |||||
|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: HVAC Air Delivery/Temperature Control Schematics Definition: Temperature actuator can't be adjusted. | |||||||||
1 | Did you review the HVAC operation and perform the necessary inspections? | -- | Go to Step 2 | Go to Air Conditioning (A/C) System Description and Air Distribution System Description | |||||
2 |
Does the air temperature actuator drive shaft rotate at all? | -- | Go to Step 12 | Go to Step 3 | |||||
3 | Measure the voltage from the 5 volt reference circuit of the air temperature actuator to the ground circuit of the air temperature actuator. Does the voltage measure greater than specified value? | 4.9 V | Go to Step 4 | Go to Step 7 | |||||
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Important:: The air temperature actuator connector and the HVAC control module connector must be connected to correctly perform tests.
Does the air temperature actuator drive shaft rotate? | -- | Go to Step 10 | Go to Step 5 | ||||||
5 | Connect test lamp between the ignition 3 circuit of the air temperature actuator and a good ground. Does the test lamp illuminate? | -- | Go to Step 6 | Go to Step 11 | |||||
6 | Test the air temperature actuator signal circuit of the air temperature actuator for an open, high resistance, short to ground, or short to voltage. Refer to General Electrical Diagnosis and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 17 | Go to Step 12 | |||||
7 | Measure the 5 volt reference circuit of the air temperature actuator to a good ground. Does the voltage measure greater than specified value? | 4.9 V | Go to Step 8 | Go to Step 9 | |||||
8 | Test the ground circuit of the air temperature actuator for an open or high resistance. Refer to General Electrical Diagnosis and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 17 | Go to Step 14 | |||||
9 | Test the 5 volt reference circuit of the air temperature actuator for an open, a high resistance, short to ground, or short to voltage. Refer to General Electrical Diagnosis and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 17 | Go to Step 14 | |||||
10 | Test the air temperature door control circuit of the air temperature actuator for an open, high resistance, short to ground, or short to voltage. Refer to General Electrical Diagnosis and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 17 | Go to Step 12 | |||||
11 | Test the ignition 3 voltage circuit of the air temperature actuator for an open or a high resistance. Refer to General Electrical Diagnosis 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 temperature door and the air temperature actuator for the following:
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 air temperature actuator. Refer to Testing for Electrical Intermittents 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 HVAC control module. Refer to Testing for Electrical Intermittents and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 17 | Go to Step 16 | |||||
15 |
Important:: Perform the recalibration procedure for the air temperature actuator. Replace the air temperature actuator. Refer to Temperature Actuator Replacement . Did you complete the replacement? | -- | Go to Step 17 | -- | |||||
16 |
Important:: Perform the recalibration procedure for the HVAC control module. Replace the HVAC control module. Refer to Control Assembly Replacement . Did you complete the replacement? | -- | Go to Step 17 | -- | |||||
17 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 | |||||
