A/C Condenser Fan High Speed Circuit Troubleshooting
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.
1.
Fuse check:

Fuse check
?1.
Check the following fuses.
Fuse
No. B23 (30 A)
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).?
2.
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
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
     
     
     
3.
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
Terminal B
Body ground

Terminal A
Terminal B
Body ground

Terminal A
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.
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.?
5.
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.?
6.
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.?
7.
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
Terminal B
Body ground

Terminal A
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.?