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:

	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.
	Do not use this troubleshooting procedure if the cooling fan is also inoperative with the A/C on. Refer to the symptom troubleshooting index.
	Before doing symptom troubleshooting, check for PGM-FI DTCs.

Fuse check:

Fuse check

?1.

Check the following fuse.

Fuse	No. A23 (10 A)
Location	Under-hood fuse/relay box

Is the fuse OK?


	YES

Go to step 2.


	NO

Replace the fuse, and recheck. If the fuse blows again, repair a short in the No. A23 (10 A) fuse circuit.?

A/C pressure sensor parameter check:

A/C pressure sensor parameter check

?1.	Connect the HDS to the DLC.

?2.	Start the engine.

?3.

Set the A/C system to the following conditions:

	A/C: ON
	Fan control: ON

?4.

Check the parameter(s) below with the HDS.

Signal	Threshold		Current conditions
Signal	Values	Unit	Values	Unit
ENGINE SPEED	670?770	rpm
ECT SENSOR 1	80?100	°C
ECT SENSOR 1	176?212	°F

?5.

Check the parameter(s) below with the HDS.

Signal	Threshold		Current conditions
Signal	Values	Unit	Values	Unit
A/C PRESSURE SENSOR	196?2,950	kPa
	2.00?30.08	kgf/cm²
	28.4?427.9	psi

Do the current condition(s) match the threshold?


	YES

Go to step 3.


	NO

Go to the A/C system test.?

PGM-FI system parameter check:

PGM-FI system parameter check

?1.

Check the parameter(s) below with the HDS.

Signal	Threshold		Current conditions
Signal	Values	Unit	Values	Unit
A/C SWITCH	ON
A/C CLUTCH	ON

Do the current condition(s) match the threshold?


	YES

Go to step 4.


	NO: A/C SWITCH is OFF

A/C SWITCH is OFF, replace the climate control unit.?


	NO: A/C SWITCH is ON and A/C CLUTCH is OFF

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.?

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?


	YES

Go to step 5.


	NO

Replace the A/C compressor clutch relay.?

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
Test condition	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

Is there battery voltage?


	YES

The VMP wire is OK. Go to step 6.


	NO

Repair an open in the VMP wire.?

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:

Does the A/C compressor clutch click?


	YES

Go to step 7.


	NO

Go to step 9.

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
Test condition	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

Is there battery voltage?


	YES

The IG2 A/C wire is OK. Go to step 8.


	NO

Repair an open in the IG2 A/C wire.?

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)

?5.

Connect terminals A and B with a jumper wire.

1.5 L engine

Terminal A	PCM connector E (80P) No. 31
Terminal B	Body ground

2.4 L engine

Terminal A	PCM connector A (51P) No. 13
Terminal B	Body ground

?6.	Turn the vehicle to the ON mode.

Does the A/C compressor clutch click?


	YES

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.?


	NO

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.?

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

?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:

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:

Is there continuity?


	YES

The A/C MG CLUTCH/MG CLUTCH (1.5 L engine) or A/C MG CLUTCH (2.4 L engine) wire is OK. Check the A/C compressor clutch clearance and the A/C compressor clutch field coil. Repair as needed.?


	NO

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.?