Radiator Fan High Speed Circuit Troubleshooting

Radiator Fan High Speed Circuit Troubleshooting

1. Check the No. 6 (30 A) fuse in the under-hood fuse/relay box, and the No. 15 (7.5 A) fuse in the under-hood fuse/relay box.

Are the fuses OK?
YES - Go to step 2.

NO - Replace the fuse(s) and recheck.


2. Remove the radiator fan relay from the under-hood fuse/relay box and test it. Testing and Inspection

Is the relay OK?
YES - Go to step 3.

NO - Replace the radiator fan relay.


3. Measure the voltage between the radiator fan relay 4P socket terminal No. 1 and the body ground.

Is there battery voltage?
YES - Go to step 4.

NO - Replace the under-hood fuse/relay box.






4. Connect radiator fan relay 4P socket terminals No. 1 and No. 2 with a jumper wire.

Does the radiator fan run at high speed?
YES - Go to step 5.

NO - Repair open in the wire between radiator fan relay 4P socket terminal No. 2 and radiator fan motor 2P connector terminal No. 2.






5. Turn the ignition switch to ON (II).

6. Measure the voltage between the radiator fan relay 4P socket terminal No. 4 and the body ground.

Is there battery voltage?
YES - Repair open in the wire between the radiator fan relay 4P socket terminal No. 3 and the powertrain control module (PCM) (A5).

NO - Check the A/C diode B in the under-hood fuse/relay box. If the diode is OK, replace the under-hood fuse/relay box.