Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
DEFINITION: The A/C compressor does not engage when requested by the operator. | ||||
1 |
Are any compressor disabling diagnostic trouble codes (DTCs) set by the body control module (SBM) or the powertrain control module (PCM)? | -- | Go to the appropriate DTC table | Go to Step 2 |
2 | Use the Scan Tool in order to view the SBM data. Is the A/C clutch (actual) on? | -- | Go to Step 9 | Go to Step 3 |
3 | Use the Scan Tool in order to view the A/C pressure status. Is the A/C pressure status NORMAL? | NORMAL | Go to Step 4 | Go to Step 6 |
4 | Use the Scan Tool in order to measure the battery voltage. Is the battery voltage greater than the specified value? | 10.5 V | Go to Step 5 | Go to Charging System Check in Engine Electrical |
5 | Use the Scan Tool in order to view the A/C temperature status. Is the A/C temperature status OK? | -- | Go to Step 6 | Go to Cooling Insufficient - Air Conditioning (A/C) Inoperative |
6 | Use the Scan Tool in order to measure the system pressure. Is the system pressure low? | -- | Go to Cooling Insufficient - Air Conditioning (A/C) Inoperative | Go to Step 7 |
7 | Inspect the A/C CLU fuse for an open. Is the A/C CLU fuse open? | -- | Go to Step 8 | Go to Step 10 |
8 | Replace the A/C CLU fuse. Did you complete the repair? | -- | Go to Step 19 | -- |
9 |
Is the voltage greater than the specified value? | 10.5 V | Go to Step 15 | Go to Step 7 |
10 | Measure the voltage between terminal A of the compressor clutch and ground. Refer to Measuring Voltage in Wiring Systems. Is the voltage greater than the specified value? | 10.5 V | Go to Step 16 | Go to Step 11 |
11 |
Is the voltage greater than the specified value? | 10.5 V | Go to Step 17 | Go to Step 12 |
12 | Measure the voltage to the A/C CLU relay terminal 86. Refer to Measuring Voltage in Wiring Systems. Is the voltage greater than the specified value? | 10.5 V | Go to Step 13 | Go to Step 19 |
13 | Measure the voltage at the PCM terminal 39 CKT 459 (DK GRN/WHT). Refer to Measuring Voltage in Wiring Systems. Is the voltage greater than the specified value? | 10.5 V | Go to Step 18 | Go to Step 14 |
14 | Inspect CKT 459 (DK GRN/WHT) for an open or a short to B+. Is the repair complete? | -- | Go to Step 20 | -- |
15 | Replace the compressor. Refer to Air Conditioning Compressor Replacement . Is the repair complete? | -- | Go to Step 20 | -- |
16 | Repair the open condition in CKT 50 (BLK). Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 20 | -- |
17 | Replace the A/C CLU relay. Is the repair complete? | -- | Go to Step 20 | -- |
18 | Replace the PCM. Refer to Powertrain Control Module Replacement/Programming . Is the repair complete? | -- | Go to Step 20 | -- |
19 |
Is the repair complete? | -- | Go to Step 20 | -- |
20 | Confirm proper operation of the A/C compressor. Is the A/C compressor operating correctly? | -- | System OK | -- |
