Climate Control System Symptom Troubleshooting - The A/C compressor clutch does not engage, but the A/C condenser/radiator fans operate, and the blower and heater controls work
The A/C compressor clutch does not engage, but the A/C condenser/radiator fans operate, and the blower and heater controls work
NOTE:
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It is normal for the A/C compressor to turn off under certain conditions, such as low idle, high engine coolant temperature, or hard acceleration. |
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Before doing symptom troubleshooting, check for PGM-FI DTCs. |
1. |
Fuse check:
Fuse check
?1. |
Check the following fuse.
Fuse |
No. A23 (10 A) |
Location |
Under-hood fuse/relay box | |
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Is the fuse OK?
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Replace the fuse, and recheck. If the fuse blows again, repair a short in the No. A23 (10 A) fuse circuit.? |
2. |
A/C pressure sensor parameter check:
A/C pressure sensor parameter check
?3. |
Set the A/C system to the following conditions:
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?4. |
Check the parameter(s) below with the HDS.
Signal |
Threshold |
Current conditions |
Values |
Unit |
Values |
Unit |
ENGINE SPEED |
670?770 |
rpm |
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ECT SENSOR 1 |
80?100 |
°C |
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176?212 |
°F | |
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?5. |
Check the parameter(s) below with the HDS.
Signal |
Threshold |
Current conditions |
Values |
Unit |
Values |
Unit |
A/C PRESSURE SENSOR |
196?2,950 |
kPa |
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2.00?30.08 |
kgf/cm2 |
28.4?427.9 |
psi | |
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Do the current condition(s) match the threshold?
3. |
PGM-FI system parameter check:
PGM-FI system parameter check
?1. |
Check the parameter(s) below with the HDS.
Signal |
Threshold |
Current conditions |
Values |
Unit |
Values |
Unit |
A/C SWITCH |
ON |
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A/C CLUTCH |
ON |
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Do the current condition(s) match the threshold?
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NO: A/C SWITCH is ON and A/C CLUTCH is OFF |
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A/C SWITCH is ON and A/C CLUTCH is OFF, check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM, then recheck. If the symptom/indication goes away and the PCM was substituted, replace the original PCM.? |
4. |
A/C compressor clutch relay check:
A/C compressor clutch relay check
?1. |
Turn the vehicle to the OFF (LOCK) mode. |
?2. |
Remove the A/C compressor clutch relay from the under-hood fuse/relay box, and test it. | |
Is the relay OK?
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Replace the A/C compressor clutch relay.? |
5. |
Open wire check (VMP line):
Open wire check (VMP line)
?1. |
Measure the voltage between test points 1 and 2.
Test condition |
Vehicle OFF (LOCK) mode |
A/C compressor clutch relay: disconnected |
Test point 1 |
A/C compressor clutch relay 4P socket (female terminals) No. 1:  |
Test point 2 |
Body ground | |
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Is there battery voltage?
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The VMP wire is OK. Go to step 6. |
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Repair an open in the VMP wire.? |
6. |
Determine possible failure area (A/C compressor clutch relay switch side circuit, A/C compressor clutch relay coil side circuit):
Determine possible failure area (A/C compressor clutch relay switch side circuit, A/C compressor clutch relay coil side circuit)
?1. |
Connect terminals A and B with a jumper wire.
Terminal A |
A/C compressor clutch relay 4P socket (female terminals) No. 1:  |
Terminal B |
A/C compressor clutch relay 4P socket (female terminals) No. 2:  | |
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Does the A/C compressor clutch click?
7. |
Open wire check (IG2 A/C line):
Open wire check (IG2 A/C line)
?1. |
Disconnect the jumper wire. |
?2. |
Turn the vehicle to the ON mode. |
?3. |
Measure the voltage between test points 1 and 2.
Test condition |
Vehicle ON mode |
A/C compressor clutch relay: disconnected |
Test point 1 |
A/C compressor clutch relay 4P socket (female terminals) No. 3:  |
Test point 2 |
Body ground | |
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Is there battery voltage?
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The IG2 A/C wire is OK. Go to step 8. |
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Repair an open in the IG2 A/C wire.? |
8. |
Open wire check (A/C MG CLUTCH RLY CL-/ACC (1.5 L engine) or A/C MG CLUTCH RLY CL- (2.4 L engine) line):
Open wire check (A/C MG CLUTCH RLY CL-/ACC (1.5 L engine) or A/C MG CLUTCH RLY CL- (2.4 L engine) line)
?1. |
Turn the vehicle to the OFF (LOCK) mode. |
?2. |
Reinstall the A/C compressor clutch relay. |
?3. |
Jump the SCS line with the HDS, and wait more than 1 minute.
NOTE: This step must be done to protect the PCM from damage. |
?4. |
Disconnect the following connector.
1.5 L engine: PCM connector E (80P) |
2.4 L engine: PCM connector A (51P) | |
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?5. |
Connect terminals A and B with a jumper wire.
1.5 L engine
Terminal A |
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Terminal B |
Body ground | |
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2.4 L engine
Terminal A |
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Terminal B |
Body ground | |
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?6. |
Turn the vehicle to the ON mode. | |
Does the A/C compressor clutch click?
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Repair an open in the A/C MG CLUTCH RLY CL-/ACC (1.5 L engine) or A/C MG CLUTCH RLY CL- (2.4 L engine) wire.? |
9. |
Open wire check (A/C MG CLUTCH/MG CLUTCH (1.5 L engine) or A/C MG CLUTCH (2.4 L engine) line):
Open wire check (A/C MG CLUTCH/MG CLUTCH (1.5 L engine) or A/C MG CLUTCH (2.4 L engine) line)
?1. |
Disconnect the jumper wire. |
?2. |
Disconnect the following connector.
1.5 L engine: A/C compressor clutch 3P connector
2.4 L engine: A/C compressor clutch 1P connector | |
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?3. |
Check for continuity between test points 1 and 2.
1.5 L engine
Test condition |
Vehicle OFF (LOCK) mode |
A/C compressor clutch relay: disconnected |
A/C compressor clutch 3P connector: disconnected |
Test point 1 |
A/C compressor clutch relay 4P socket (female terminals) No. 2:  |
Test point 2 |
A/C compressor clutch 3P connector (female terminals) No. 1:  | |
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2.4 L engine
Test condition |
Vehicle OFF (LOCK) mode |
A/C compressor clutch relay: disconnected |
A/C compressor clutch 1P connector: disconnected |
Test point 1 |
A/C compressor clutch relay 4P socket (female terminals) No. 2:  |
Test point 2 |
A/C compressor clutch 1P connector (female terminals) No. 1:  | |
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Is there continuity?
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Repair an open in the A/C MG CLUTCH/MG CLUTCH (1.5 L engine) or A/C MG CLUTCH (2.4 L engine) wire.? | |