Climate Control System Symptom Troubleshooting - The A/C condenser/radiator fans do not run at high speed, but do run at low speed
The A/C condenser/radiator fans do not run at high speed, but do run at low speed
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. A2-6 (30 A)
Location
Under-hood fuse/relay box

Fuse
No. B25 (7.5 A)
Location
Fuse/relay holder A

Is each fuse 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. A2-6 (30 A) and/or the No. B25 (7.5 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.
1.5 L engine: PCM connector A (50P)
2.4 L engine: PCM connector A (51P)

?3.
Connect terminals A and B with a jumper wire.
1.5 L engine
Terminal A
PCM connector A (50P) No. 17
Terminal B
Body ground

2.4 L engine
Terminal A
PCM connector A (51P) No. 9
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.
1.5 L engine
Terminal A
PCM connector A (50P) No. 18
Terminal B
Body ground

2.4 L engine
Terminal A
PCM connector A (51P) No. 10
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 relay holder F, 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 (50P): disconnected
A/C condenser fan relay: disconnected
Test point 1
A/C condenser fan relay 4P socket (female terminals) No. 1:
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.?
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 (female terminals) No. 1:
Terminal B
A/C condenser fan relay 4P socket (female terminals) 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.
A/C condenser fan relay coil side power circuit check:

A/C condenser fan relay coil side power circuit check
?1.
Disconnect the jumper wire.

?2.
Measure the voltage between test points 1 and 2.
1.5 L engine
Test condition
Vehicle OFF (LOCK) mode
PCM connector A (50P): disconnected
A/C condenser fan relay: disconnected
Test point 1
A/C condenser fan relay 4P socket (female terminals) No. 3:
Test point 2
Body ground

2.4 L engine
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 (female terminals) No. 3:
Test point 2
Body ground


?3.
Turn the vehicle to the ON mode.

Is there battery voltage?

     
YES
     
     
     
Repair an open in the FAN HI SIGNAL wire.?
     
NO
     
     
     
Repair an open in the IGP2 SUB wire.?