Radiator Fan High Speed Circuit Troubleshooting

Radiator Fan High Speed Circuit Troubleshooting
1. Check the No. 11 (30 A) fuse in the under-hood fuse/relay box, and the No. 23 (7.5 A) fuse in the under-dash 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.
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 an open in the wire between radiator 4P fan relay 4P socket terminal No. 1 and the underhood 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 an 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 ON (II).





6. Measure voltage between radiator fan relay 4P socket terminal No. 3 and body ground.
Is there battery voltage?
YES - Repair an open in the wire between radiator fan relay 4P socket terminal No. 4 and engine control module (ECM)/the powertrain control module (PCM) (A3).
NO - Repair an open in the wire between radiator fan relay 4P socket terminal No. 3 and the underdash fuse/relay box.