Radiator Fan High Speed Circuit Troubleshooting

Radiator Fan High Speed Circuit Troubleshooting

1. Check the No. 7 (7.5 A), No. 8 (15 A) and No. 16 (30 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. Power Relay Test

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

NO - Replace the radiator fan relay.


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

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

NO - Repair open in the RED wire between radiator fan relay 4P socket terminal No. 1 and the No. 3 fuse in the main under-hood fuse 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 BRN 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 radiator fan relay 4P socket terminal No. 4 and body ground.

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

NO - Repair open in the PUR wire between radiator fan relay 4P socket terminal No. 4 and the under-hood fuse/relay box.