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Component Tests and General Diagnostics
Radiator Fan High Speed Circuit Troubleshooting1. Remove the fan control relay from the under-hood fuse/relay box, and test it.
Is the relay OK?
YES - Go to step 2.
NO - Replace the fan control relay.
2. Measure the voltage between the fan control relay 5P socket terminal No. 5 and body ground.
Is there battery voltage?
YES - Go to step 3.
NO - Replace the under-hood fuse/relay box.
3. Check for continuity between the fan control relay 5P socket terminal No. 2 and body ground.
Is there continuity?
YES - Replace the under-hood fuse/relay box.
NO - Repair open in the wire between the fan control relay 5P socket terminal No. 2 and body ground. If the wire is OK, check for poor ground at G302.