Table 1: | Compressor Control Module Voltage Table |
Step | Action | Yes | No |
---|---|---|---|
1 | Was the HVAC System Check performed? | Go to Step 2 | Go to HVAC System Check |
2 |
Important: Before performing this diagnostic, verify that the air conditioning (A/C) refrigerant system is in the correct mechanical condition in order to avoid a misdiagnosis.Inspect the refrigerant level.Inspect the system for leaks. Start the engine. Does the test lamp light? | Go to Step 3 | Go to Step 4 |
3 | Replace the A/C compressor clutch. Refer to Compressor Clutch Coil Replacement . Is the repair complete? | Go to HVAC System Check | -- |
4 |
Does the test lamp light? | Go to Step 5 | Go to Step 6 |
5 | Repair the open in the BLK/RED wire between the A/C compressor clutch relay and the A/C compressor clutch. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to HVAC System Check | -- |
6 | Backprobe the connector of the A/C compressor clutch relay with a test lamp from terminal 4 to ground. Does the test lamp light? | Go to Step 8 | Go to Step 7 |
7 | Repair the open in the RED/WHT wire between the A/C fuse and the A/C compressor clutch relay. Is the repair complete? | Go to HVAC System Check | -- |
8 | Backprobe the connector of the A/C compressor clutch relay with a test lamp from terminal 1 to ground. Does the test lamp light? | Go to Step 10 | Go to Step 9 |
9 | Repair the open in the LT GRN wire between the junction block and the A/C compressor clutch relay. Is the repair complete? | Go to HVAC System Check | -- |
10 |
Does the A/C compressor clutch engage? | Go to Step 11 | Go to Step 12 |
11 | Connect a test lamp to the connector of the A/C compressor control module from terminal 8 to ground. Does the test lamp light? | Go to Step 16 | Go to Step 15 |
12 | Backprobe the connector of the A/C compressor clutch relay with a fused jumper wire from terminal 2 to ground. Does the compressor clutch engage? | Go to Step 14 | Go to Step 13 |
13 | Replace the A/C compressor clutch relay. Refer to Compressor Relay Replacement . Is the repair complete? | Go to HVAC System Check | -- |
14 | Repair the open in the PNK wire between the A/C compressor clutch relay and the A/C compressor control module. Is the repair complete? | Go to HVAC System Check | -- |
15 | Repair the open in the BLK/WHT wire between S202 and the A/C compressor control module. Is the repair complete? | Go to HVAC System Check | -- |
16 | Connect a test lamp to the connector of the A/C compressor control module from terminal 3 to B+. Does the test lamp light? | Go to Step 18 | Go to Step 17 |
17 | Repair the open in the BLK/BLU wire or in the BLK wire between terminal 3 of the A/C compressor control module and G201. Is the repair complete? | Go to HVAC System Check | -- |
18 | Connect a test lamp to the connector of the A/C compressor control module from terminal 9 to B+. Does the test lamp light? | Go to Step 20 | Go to Step 19 |
19 | Repair the open in the BLK wire between terminal 9 of the A/C compressor control module and G201. Is the repair complete? | Go to HVAC System Check | -- |
20 | Connect a test lamp to the connector of the A/C compressor control module from terminal 11 to ground. Does the test lamp light? | Go to Step 22 | Go to Step 21 |
21 | Backprobe the connector of the A/C switch with a test lamp from terminal 2 to ground. Does the test lamp light? | Go to Step 24 | Go to Step 23 |
22 | Connect a test lamp to the connector of the A/C compressor control module from terminal 12 to B+. Does the test lamp light? | Go to Step 27 | Go to Step 28 |
23 | Backprobe the connector of the A/C switch with a test lamp from terminal 1 to ground. Does the test lamp light? | Go to Step 25 | Go to Step 26 |
24 | Repair the open in the BLU/WHT wire between the A/C switch and the A/C compressor control module. Is the repair complete? | Go to HVAC System Check | -- |
25 | Replace the A/C switch. Refer to Air Conditioning (A/C) Cooling Fan Switch Replacement . Is the repair complete? | Go to HVAC System Check | -- |
26 | Repair the open in the PNK/BLK wire between S233 and the A/C switch. Is the repair complete? | Go to HVAC System Check | -- |
27 |
Is the resistance greater than 2000 ohms? | Go to Step 32 | Go to Step 33 |
28 |
Does the test lamp light? | Go to Step 29 | Go to Step 31 |
29 | Inspect for an open in the ORN/BLK wire between the A/C compressor control module and the refrigerant pressure switch. Did you find an open? | Go to Step 39 | Go to Step 30 |
30 | Replace the refrigerant pressure switch. Refer to Pressure Cycling Switch Replacement . Is the repair complete? | Go to HVAC System Check | -- |
31 | Repair the open in the BLK wire between the refrigerant pressure switch and G103. Is the repair complete? | Go to HVAC System Check | -- |
32 | Replace the evaporator temperature sensor. Refer to Air Conditioning (A/C) Temperature Sensor Replacement . Is the repair complete? | Go to HVAC System Check | -- |
33 |
Is the resistance greater than 2000 ohms? | Go to Step 34 | Go to Step 35 |
34 | Repair the open in the WHT/BLU wire or in the YEL/GRN wire between the A/C compressor control module and the evaporator temperature sensor. Is the repair complete? | Go to HVAC System Check | -- |
35 |
Is the resistance infinite? | Go to Step 37 | Go to Step 36 |
36 | Repair the short to ground in the LT GRN/RED wire between the PCM and the A/C compressor control module. Is the repair complete? | Go to HVAC System Check | -- |
37 |
Does the test lamp light? | Go to Air Conditioning (A/C) Idle Circuit Diagnosis 1.0L or Air Conditioning (A/C) Idle Circuit Diagnosis 1.3L in Engine Controls | Go to Step 38 |
38 | Replace the A/C compressor control module. Refer to Air Conditioning (A/C) Compressor Control Module Replacement . Is the repair complete? | Go to HVAC System Check | -- |
39 | Repair the open in the ORN/BLK wire between the A/C compressor control module and the refrigerant pressure switch. Is the repair complete? | Go to HVAC System Check | -- |
Terminal/Wire | Circuit | Normal Value | Condition |
---|---|---|---|
1/BLU/RED | A/C idle-up control | 0-1 Volt | The ignition switch, the blower switch, and the A/C switch are ON. |
10-14 Volts | The ignition switch is ON. | ||
2 | Not Used | ||
3/BLK/BLU | Ground | 0-1 Volt | The ignition switch is ON. |
4/WHT/BLU | Evaporator temperature input | 1.2-1.5 Volts (2107-2575 ohms | The evaporator temperature is approximately 15°C (59°F) with the ignition switch ON. |
2.1-2.4 Volts (4609-5095 ohms) | The evaporator temperature is approximately 0°C (32°F) with the ignition switch ON. | ||
5/LT GRN/RED | A/C cutout signal | 10-14 Volts | The blower switch and the A/C switch are ON with the engine running. |
0-1 Volt | The ignition switch is ON. | ||
6 | Not Used | ||
7/PNK | Compressor clutch relay control | 0-1 Volt | The blower switch and the A/C switch are ON with the engine running. |
10-14 Volts | The ignition switch is ON. | ||
8/BLK/WHT | Ignition power | 10-14 Volts | The ignition switch is ON. |
9/BLK | Ground | 0-1 Volt | The ignition switch is ON. |
10/YEL/GRN | Evaporator temperature sensor ground | 0-1 Volt | The ignition switch is ON. |
11/BLU/WHT | A/C request signal | 10-14 Volts | The ignition switch, the blower switch, and the A/C switch are ON. |
0-1 Volt | The ignition switch is ON, and the blower switch or the A/C switch is OFF. | ||
12/ORN/BLK | Refrigerant pressure switch signal | 0-1 Volt | The refrigerant pressure is 200-3200 kPa (28.4-454.4 psi) with the ignition switch ON. |
10-14 Volts | The ignition switch is ON. |