A/C Condenser Fan High Speed Circuit Troubleshooting

NOTE:

	Do not use this troubleshooting procedure if the A/C compressor is inoperative. Refer to the symptom troubleshooting index.
	If the A/C system is inoperable, the radiator and A/C condenser fans are controlled based only on engine coolant temperature.
	Before doing symptom troubleshooting, check for PGM-FI DTCs.

Fuse check:

Fuse check

?1.

Check the following fuses.

Fuse	No. B23 (30 A)
Fuse	No. B31 (7.5 A)
Location	Under-hood fuse/relay box

Are the fuses OK?


	YES

Go to step 2.


	NO

Replace the fuse(s), and recheck. If the fuse(s) blows again, repair a short in the No. B23 (30A) and/or No. B31 (7.5A) fuse circuit(s).?

A/C condenser fan low speed operation check:

A/C condenser fan low speed operation check

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

?2.

Disconnect the following connector.

PCM connector A (51P)

?3.

Connect terminals A and B with a jumper wire.

Terminal A	PCM connector A (51P) No. 22
Terminal B	Body ground

?4.	Turn the vehicle to the ON mode.

Do the A/C condenser and radiator fans run on low?


	YES

Go to step 3.


	NO

Go to radiator and A/C condenser fan low speed circuit troubleshooting.?

A/C condenser fan high speed operation check:

A/C condenser fan high speed operation check

?1.	Turn the vehicle to the OFF (LOCK) mode.

?2.

Connect terminals A and B with jumper wires.

Terminal A	PCM connector A (51) No. 3
Terminal B	Body ground

Terminal A	PCM connector A (51P) No. 19
Terminal B	Body ground

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

?3.	Turn the vehicle to the ON mode.

Do the A/C condenser and radiator fans run on high?


	YES

Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the PCM was substituted, and the symptom/indication goes away, replace the original PCM.?


	NO

Go to step 4.

A/C condenser fan relay check:

A/C condenser fan relay check

?1.	Turn the vehicle to the OFF (LOCK) mode.

?2.	Disconnect the jumper wires.

?3.	Remove the A/C condenser fan 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 condenser fan relay.?

Open wire check (+B SUB FAN line):

Open wire check (+B SUB FAN line)

?1.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (51P): disconnected
	A/C condenser fan relay: disconnected
Test point 1	A/C condenser fan relay 4P socket No. 2
Test point 2	Body ground

Is there battery voltage?


	YES

The +B SUB FAN wire is OK. Go to step 6.


	NO

An open in the +B SUB FAN wire. Replace the under-hood fuse/relay box.?

Open wire check (SUB FAN MOTOR line):

Open wire check (SUB FAN MOTOR line)

?1.

Connect terminals A and B with jumper wires.

Terminal A	A/C condenser fan relay 4P socket No. 1
Terminal B	A/C condenser fan relay 4P socket No. 2

Does the A/C condenser fan run on high?


	YES

The SUB FAN MOTOR wire is not open. Go to step 7.


	NO

Repair an open in the wire between the A/C condenser fan relay and the A/C condenser fan motor.?

Open wire check (IGP2 SUB line):

Open wire check (IGP2 SUB line)

?1.	Disconnect the jumper wire.

?2.

Connect terminals A and B with jumper wires.

Terminal A	PCM connector A (51P) No. 3
Terminal B	Body ground

Terminal A	PCM connector A (51P) No. 19
Terminal B	Body ground

?3.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (51): disconnected
	A/C condenser fan relay: disconnected
	PCM connector A (51) No. 3: jumped to body ground
	PCM connector A (51P) No. 19: jumped to body ground
Test point 1	A/C condenser fan relay 4P socket No. 3
Test point 2	Body ground

Is there battery voltage?


	YES

Repair an open in the wire between the A/C condenser fan relay and the PCM.?


	NO

An open in the IGP2 SUB wire. Replace the under-hood fuse/relay box.?