A/C Does Not Work
DETECTION CONDITION AND POSSIBLE CAUSE
| 19 |
A/C DOES NOT WORK |
| DESCRIPTION |
- A/C compressor clutch does not engage when A/C is turned on
|
A/C DOES NOT WORK INSPECTION
| STEP |
INSPECTION |
ACTION |
| 1 |
PRELIMINARY CHECKS
- Perform the following preliminary checks:
- A/C system (such as belts, hoses).
- A/C switches.
- Related fuse(s).
- Cooling system (overheating).
- Are all checks OK?
|
Yes |
Go to step 2. |
| No |
Service as required. Verify symptom no longer exists. |
| 2 |
CHECK FOR VOLTAGE TO A/C CLUTCH
NOTE:
If the A/C clutch will engage, follow the "Yes" Action of this test step. If not, or unsure, continue with this test step.
- Key OFF.
- Disconnect A/C cycling switch connector G-162.
- Install jumper wire in the A/C cycling switch connector to complete the circuit.
- Disconnect A/C clutch field coil connector G-166.
- Connect multimeter between power pin and ground pin at A/C clutch field coil connector.
- Start engine.
- Turn A/C on, wait 15 seconds.
- Check voltage reading.
- After testing, turn key off and reconnect A/C clutch field coil connector G-166.
- Was voltage greater than 10.5 volts?
|
Yes |
Remove jumper. Reconnect A/C cycling switch. See TROUBLE SHOOTING
in A/C-HEATER SYSTEM article in HVAC
to diagnose symptom
|
| No |
No voltage to A/C clutch. Go to step 3. |
| 3 |
CHECK ACCS INPUT TO PCM WITH A/C ON
- Key OFF.
- Disconnect A/C cycling switch connector G-162 and install jumper wire in the connector.
- Connect NGS Tester.
- Start engine.
- A/C ON.
- Monitor ACCS PID.
- After testing, remove jumper and reconnect A/C cycling switch connector G-162.
- Was the ACCS PID "ON"?
|
Yes |
Go to step 4. |
| No |
The PCM is not receiving the ACCS signal. As a result, the PCM will not allow the A/C to turn on. See
A/C CLUTCH RELAY (ACCR) MALFUNCTION
step 7.
|
| 4 |
PERFORM PCM QUICK TEST
- Are any DTCs displayed during Continuous Memory, Key ON, Engine OFF (KOEO) or Key ON, Engine Running (KOER) Self Tests?
|
Yes |
Check for cause. See
DIAGNOSTIC TROUBLE CODE NUMBERS
.
|
| No |
See TROUBLE SHOOTING
in A/C-HEATER SYSTEM article in HVAC
for further diagnosis. Go to step 5
|
| 5 |
- Verify test results. If OK, see
DIAGNOSTIC INDEX
to service any additional symptoms
|