A/C Compressor Clutch Circuit Troubleshooting (With Climate Control)

A/C Compressor Clutch Circuit Troubleshooting

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 fans are 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. A17 (7.5 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. A17 (7.5 A) fuse circuit.?

A/C pressure threshold check:

A/C pressure threshold check

?1.	Connect the HDS to the DLC.

?2.	Start the engine.

?3.	Set the A/C button and the fan control button to ON.

?4.

Using the HDS, check the following conditions:

Signal	Threshold		Current conditions
Signal	Values	Unit	Values	Unit
ENGINE SPEED	K24W1 engine (M/T): 730?830	rpm
	K24W1 engine (CVT): 670?770	rpm
	J35Y1 engine (A/T): 600?700	rpm
	J35Y2 engine (M/T): 700?800	rpm
ECT SENSOR 2	80?100	°C
ECT SENSOR 2	176?212	°F
TP SENSOR	About 0.5	V

?5.

Check the parameter(s) below with the HDS.

Signal	Threshold		Current conditions
Signal	Values	Unit	Values	Unit
A/C PRESSURE SENSOR	196?3,138	kPa
	2.00?32.00	kgf/cm²
	28.4?455.1	psi

Do the current condition(s) match the threshold?


	YES

Go to step 3.


	NO

Go to the A/C system test.?

Climate control system check:

Climate control system 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, go to the A/C signal circuit troubleshooting.?


	NO

A/C SWITCH is ON and A/C CLUTCH is OFF, update the PCM if it does not have the latest software, or substitute a known-good PCM, and recheck.?

A/C compressor clutch relay check:

A/C compressor clutch relay check

?1.	Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF 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 (+B MG CLUTCH line):

Open wire check (+B MG CLUTCH line)

?1.

Measure the voltage between test points 1 and 2.

Test condition	IG LOCK (0) or OFF mode
Test condition	A/C compressor clutch relay: disconnected
Test circuit	+B MG CLUTCH
Test point 1	A/C compressor clutch relay 4P socket No. 1 (TAN)
Test point 2	Body ground

Is there battery voltage?


	YES

The +B MG CLUTCH wire is OK. Go to step 6.


	NO

Repair an open in the wire between the No. A17 (7.5 A) fuse in the under-hood fuse/relay box and the A/C compressor clutch relay.?

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 No. 1 (TAN)
Terminal B	A/C compressor clutch relay 4P socket No. 2 (RED)

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 ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?3.

Measure the voltage between test points 1 and 2.

Test condition	IG ON (II) or ON mode
Test condition	A/C compressor clutch relay: disconnected
Test circuit	IG2 A/C
Test point 1	A/C compressor clutch relay 4P socket No. 3 (LT GRN)
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 wire between the relay circuit board and the A/C compressor clutch relay in the under-hood fuse/relay box, or between the No. B1 (7.5 A) fuse in the under-dash fuse/relay box and the relay circuit board in the under-hood fuse/relay box. If wires are OK, replace the relay circuit board.?

Open wire check (A/C MG CLUTCH RLY CL- line):

Open wire check (A/C MG CLUTCH RLY CL- line)

?1.	Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.	Reinstall the A/C compressor clutch relay.

?3.	Jump the SCS line with the HDS. NOTE: This step must be done to protect the PCM from damage.

?4.

Disconnect the following connector.

PCM connector A (51P)

?5.

Connect terminals A and B with a jumper wire.

K24W1 engine

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

J35Y1 and J35Y2 engines

Terminal A	PCM connector A (51P) terminal No. 23 (PUR)
Terminal B	Body ground

?6.	Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

Does the A/C compressor clutch click?


	YES

Update the PCM if it does not have the latest software, or substitute a known-good PCM, and recheck.?


	NO

Repair an open in the wire between the A/C compressor clutch relay and the PCM.?

Open wire check (A/C MG CLUTCH or A/C MG CLUTCH/A/C MG line):

Open wire check (A/C MG CLUTCH or A/C MG CLUTCH/A/C MG line)

?1.	Disconnect the jumper wire.

?2.

Disconnect the following connector.

A/C compressor clutch 1P connector

?3.

Check for continuity between test points 1 and 2.

K24W1 engine

Test condition	IG LOCK (0) or OFF mode
	A/C compressor clutch relay: disconnected
	A/C compressor clutch 1P connector: disconnected
Test circuit	A/C MG CLUTCH
Test point 1	A/C compressor clutch relay 4P socket No. 2 (RED)
Test point 2	A/C compressor clutch 1P connector No. 1 (RED/WHT)

J35Y1 and J35Y2 engines

Test condition	IG LOCK (0) or OFF mode
	A/C compressor clutch relay: disconnected
	A/C compressor clutch 1P connector: disconnected
Test circuit	A/C MG CLUTCH/A/C MG
Test point 1	A/C compressor clutch relay 4P socket No. 2 (RED)
Test point 2	A/C compressor clutch 1P connector No. 1 (RED)

Is there continuity?


	YES

The A/C MG CLUTCH or A/C MG CLUTCH/A/C MG 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 wire between the A/C compressor clutch relay and the A/C compressor clutch.?