Climate Control System Symptom Troubleshooting - The A/C condenser/radiator fans do not run at high speed, but do run at low speed with the A/C on
The A/C condenser/radiator fans do not run at high speed, but do run at low speed with the A/C on
NOTE:
Do not use this troubleshooting procedure if the A/C compressor is inoperative. Refer to the symptom troubleshooting index.
If A/C refrigerant pressure is abnormal, 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. A10 (20 A)
No. A11 (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. A10 (20 A) and/or No. A11 (5 A) 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, and wait more than 1 minute.

NOTE: This step must be done to protect the PCM from damage.

?2.
Disconnect the following connector.
PCM connector No. 2 (58P)

?3.
Connect terminals A and B with a jumper wire.
Terminal A
PCM connector No. 2 (58P) No. 12
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
PCM connector No. 2 (58P) No. 36
Terminal B
Body ground

Terminal A
PCM connector No. 2 (58P) No. 47
Terminal B
Body ground

?3.
Turn the vehicle to the ON mode.

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

     
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
     
     
     
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 No. 2 (58P): disconnected
A/C condenser fan relay: disconnected
Test point 1
A/C condenser fan relay 4P socket No. 1
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
The +B SUB FAN wire is OK. Go to step 6.
     
NO
     
     
     
Repair an open in the +B SUB FAN wire.?
6.
Open wire check (SUB FAN MOTOR line):

Open wire check (SUB FAN MOTOR line)
?1.
Connect terminals A and B with a jumper wire.
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 SUB FAN MOTOR wire.?
7.
Open wire check (IGPS(LAF) line):

Open wire check (IGPS(LAF) line)
?1.
Disconnect the jumper wire.

?2.
Connect terminals A and B with jumper wires.
Terminal A
PCM connector No. 2 (58P) No. 36
Terminal B
Body ground

Terminal A
PCM connector No. 2 (58P) No. 47
Terminal B
Body ground

?3.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
PCM connector No. 2 (58P): disconnected
A/C condenser fan relay: disconnected
PCM connector No. 2 (58P) No. 36: jumped to body ground
PCM connector No. 2 (58P) No. 47: jumped to body ground
Test point 1
A/C condenser fan relay 4P socket No. 5
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
Repair an open in the FAN HI SIGNAL wire between the A/C condenser fan relay and the PCM.?
     
NO
     
     
     
Repair an open in the IGPS(LAF) wire.?