Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: HVAC Schematics DEFINITION: A/C compressor clutch will not disengage when no A/C request has been made and no Powertrain DTC has been set. | |||
1 | Did you perform the Diagnostic System Check? | Go to Step 2 | |
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 the scan tool, observe the A/C commanded parameter in the Powertrain Data List. Does the scan tool indicate the A/C commanded parameter is ON? | Go to Step 4 | Go to Step 6 |
4 | With the scan tool, observe the A/C Control Head (Desired) parameter in the DIM A/C Information List. Does the scan tool display OFF? | Go to Step 5 | Go to Step 11 |
5 | With a scan tool, observe the A/C Clutch (Desired) parameter in the DIM A/C Information List. Does the scan tool display OFF? | Go to Step 13 | Go to Step 12 |
6 |
Does the A/C compressor clutch disengage? | Go to Step 7 | Go to Step 8 |
7 | Test the control circuit of the A/C compressor clutch relay 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 19 | Go to Step 10 |
8 | Test the A/C compressor clutch voltage supply circuit 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 19 | Go to Step 9 |
9 | Inspect for poor connections at the harness connector of the A/C compressor clutch. 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 19 | Go to Step 15 |
10 | 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. Did you find and correct the condition? | Go to Step 19 | Go to Step 14 |
11 | 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 19 | Go to Step 16 |
12 | Inspect for poor connections at the Dash Integration Module (DIM). 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 19 | Go to Step 17 |
13 | 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. Did you find and correct the condition? | Go to Step 19 | Go to Step 18 |
14 | Replace the A/C compressor clutch relay. Did you complete the replacement? | Go to Step 19 | -- |
15 | Replace the A/C compressor. Refer to Air Conditioning Compressor Replacement in Heating, Ventilation, and Air Conditioning. Did you complete the replacement? | Go to Step 19 | -- |
16 |
Important: Perform the recalibration procedure for the HVAC control module. Replace the IPM. Refer to HVAC Control Module Replacement . Did you complete the replacement? | Go to Step 19 | -- |
17 | Replace the Dash Integration Module (DIM). Refer to Dash Integration Module Replacement in Body Control Systems. Did you complete the replacement? | Go to Step 19 | -- |
18 |
Important: Perform the setup procedure for the PCM. Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls-4.6L. Did you complete the replacement? | Go to Step 19 | -- |
19 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
