Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: HVAC Compressor Control Schematics DEFINITION: The A/C compressor clutch will not disengage when an A/C request has not been made and a Powertrain DTC has not been set. | ||||
1 | Did you perform the HVAC Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check |
2 |
Does the A/C compressor operate? | -- | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
3 | With a scan tool, observe the A/C Relay Command status in the Engine Data 2 data list. Does the scan tool indicate that the A/C Relay Command status is ON? | -- | Go to Step 4 | Go to Step 5 |
4 | With a scan tool, observe the A/C Request parameter in the Engine Data 2 data list. Does the scan tool indicate that the A/C Request parameter is YES? | -- | Go to Step 10 | Go to Step 11 |
5 | Remove the A/C compressor clutch relay. Does the A/C compressor clutch turn OFF? | -- | Go to Step 6 | Go to Step 8 |
6 | Measure the resistance between the switch side A/C compressor clutch relay terminals. Does the resistance measurement equal the specified value? | ∞ | Go to Step 7 | Go to Step 9 |
7 | Test circuit 459 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 11 |
8 | Test circuit 49 for a short to voltage. 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 | Inspect for poor connections at the A/C compressor clutch relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. | -- | Go to Step 16 | Go to Step 12 |
10 | Inspect for poor connections at the harness connector of the HVAC control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. | -- | Go to Step 16 | Go to Step 14 |
11 | Inspect for poor connections at the harness connector of the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. | -- | Go to Step 16 | Go to Step 15 |
12 | Replace the A/C compressor clutch relay. Did you complete the replacement? | -- | Go to Step 16 | -- |
13 | Replace the A/C compressor clutch. Refer to Air Conditioning Clutch Coil Removal and Air Conditioning Clutch Coil Installation in Heating, Ventilation, and Air Conditioning. Did you complete the replacement? | -- | Go to Step 16 | -- |
14 |
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 16 | -- |
15 |
Important: Perform the programming procedure for the PCM. Replace the PCM. Refer to Powertrain Control Module Replacement/Programming in Engine Controls-2.5L and 3.0L Did you complete the replacement? | -- | Go to Step 16 | -- |
16 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 3 |
