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 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.
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.

?3.
Connect terminals A and B with a jumper wire.
Terminal A
PCM connector A (51P) No. 5 (WHT)
Terminal B
Body ground


?4.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

Do the A/C condenser fan (and radiator fan) run on low?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
2.
A/C condenser fan high speed operation check:

A/C condenser fan high speed operation check
?1.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.
Disconnect the jumper wires.

?3.
Connect terminals A and B with jumper wires.
Terminal A
PCM connector A (51P) No. 5 (WHT)
Terminal B
Body ground

Terminal A
PCM connector A (51P) No. 6 (YEL)
Terminal B
Body ground

Terminal A
PCM connector A (51P) No. 14 (PNK)
Terminal B
Body ground


?4.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

Do the A/C condenser fan (and radiator fan) run on high?

     
YES
     
     
     
Update the PCM if it does not have the latest software, or substitute a known-good PCM, and recheck.?
     
NO
     
     
     
Go to step 3.
3.
Fan control relay check:

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

?2.
Disconnect the jumper wires.

?3.
Remove the relay circuit board from the under-hood fuse/relay box, and test it.

Is the relay OK?

     
YES
     
     
     
Go to step 4.
     
NO
     
     
     
4.
Open wire check (FAN HI SIGNAL line):

Open wire check (FAN HI SIGNAL line):
?1.
Reinstall the relay circuit board into the under-hood fuse/relay box.

?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
 
PCM connector A (51P): disconnected
Test circuit
FAN HI SIGNAL
Test point 1
PCM connector A (51P) No. 6 (YEL)
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
Check for an open in the BLK wire between the relay circuit board connector B (14P) terminal No. 6 and body ground. If the wire is OK, check for poor ground at G301.?
     
NO
     
     
     
Repair an open in the wire between the relay circuit board in the under-hood fuse/relay box and the PCM.?