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 set by the dash integration module (DIM) or the powertrain control module (PCM)? | -- | Go to Diagnostic Trouble Code (DTC) List/Type in Body Control Systems or Diagnostic Trouble Code (DTC) List/Type in Engine Controls - 4.6L. | Go to Step 2 |
2 | Using the scan tool view DIM data. Is the A/C Clutch (Actual) ON? | -- | Go to Step 9 | Go to Step 3 |
3 | Using the scan tool view A/C pressure status. Is the A/C pressure status NORMAL? | NORMAL | Go to Step 4 | Go to Step 6 |
4 | Using the scan tool view the Battery voltage. Is the battery voltage greater then the specified value? | 10.5 V | Go to Step 5 | Go to Diagnostic System Check - Engine Electrical in Engine Electrical. |
5 | Using the scan tool 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 | Using the scan tool view 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. Is the A/C CLU fuse replaced? | -- | Go to Step 19 | -- |
9 |
Refer to Measuring Voltage in Wiring Systems. Is the voltage measured greater then the specified value? | 10.5 V | Go to Step 15 | Go to Step 7 |
10 | Measure the voltage between terminal A of the compress clutch and ground. Refer to Measuring Voltage in Wiring Systems. Is the voltage measured greater then the specified value? | 10.5 V | Go to Step 16 | Go to Step 11 |
11 |
Refer to Measuring Voltage in Wiring Systems. Is the voltage measured greater then the specified value? | 10.5 V | Go to Step 17 | Go to Step 12 |
12 | Measure voltage to the A/C CLU relay terminal T10. Refer to Measuring Voltage in Wiring Systems. Is the voltage measured greater then the specified value? | 10.5 V | Go to Step 13 | Go to Step 19 |
13 | Measure voltage at terminal 27 CKT 459 (DK GRN/WHT) at the PCM. Refer to Measuring Voltage in Wiring Systems. Is the voltage measured greater then 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 short to battery voltage. Refer to Measuring Voltage in Wiring Systems. Is the repair complete? | -- | Go to Step 20 | -- |
15 | Replace the compressor. Refer to Air Conditioning Compressor Replacement in Heating, Ventilation and Air Conditioning. Is the repair complete? | -- | Go to Step 20 | -- |
16 | Inspect CKT 1550 (BLK) for an open condition. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 20 | -- |
17 | Replace the A/C CLU relay. Has the A/C CLU relay been replaced? | -- | Go to Step 20 | -- |
18 | Replace the PCM. Refer to Powertrain Control Module Replacement/Programming in Engine Controls - 4.6L. Is the repair complete? | -- | Go to Step 20 | -- |
19 |
Refer to Wiring Repairs in Wiring Systems. 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 | -- |
