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 - Refer to: Heating and A/C Systems Symptom Troubleshooting Index(Heating/Air Conditioning) Climate Control System Symptom Troubleshooting Index(Climate Control) .
- If A/C refrigerant pressure is abnormal, the radiator fans are controlled based only on engine coolant temperature.
- Before doing symptom troubleshooting, check for PGM-FI DTCs - Refer to: How to Troubleshoot the Fuel and Emissions SystemsHow to Troubleshoot the CVT System(CVT System) .
- 1. Fuse check:
- 1. Check the following fuses.
Fuse No. A2-10 (20 A) Location Under-hood fuse/relay box Fuse No. A8 (7.5 A) Location Under-hood fuse/relay box Are the fuses OK?
YES
Go to step 2.
NO
Replace the fuse, and recheck. If the fuse blows again, repair a short in the No. A2-10 (20 A) fuse or the No. A8 (7.5 A) fuse circuit.
- 2. 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 A (51P) - 3. Connect terminals A and B with a jumper wire.
Terminal A PCM connector A (51P) No. 9 Terminal B Body ground - 4. Turn the vehicle to the ON mode.
Does the A/C condenser fan (and radiator fan) run on low?
YES
Go to step 3.
NO
Do the radiator and A/C condenser fan low speed circuit troubleshooting - Refer to: A/C Condenser Fan High Speed Circuit Troubleshooting Radiator and A/C Condenser Fan Low Speed Circuit Troubleshooting .
- 3. 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 (51P) No. 10 Terminal B Body ground Terminal A PCM connector A (51P) No. 16 Terminal B Body ground - 3. Turn the vehicle to the ON mode.
Does 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 4.
- 4. A/C condenser fan relay check:
- 1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the jumper wires.
- 3. Reconnect PCM connector A (51P).
- 4. 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):
- 1. Measure the voltage between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode 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 wire between the No. A2-10 (20 A) fuse and the A/C condenser fan relay in the under-hood fuse/relay box.
- 6. Open wire check (SUB FAN DIODE- line):
- 1. Turn the vehicle to the ON mode.
- 2. Measure the voltage between test points 1 and 2.
Test condition Vehicle ON mode A/C condenser fan relay: disconnected 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
Repair an open in the wire between the No. A8 (7.5 A) fuse and the A/C condenser fan relay in the under-hood fuse/relay box.
