Fan Relays
NOTE:
Check electric fan motor operation before checking fan relays. Ensure PCM is securely grounded. For information on DTCs, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
- Check for loose connections at fan motors and fan motor relays. If all connections are okay, use Diagnostic Readout Box (DRB) to check for Diagnostic Trouble Codes (DTCs). If no DTCs are present, go to next step.
- With ignition on and engine at normal operating temperature, check for battery voltage on both sides of fuse "B" (30-amp on 2000; 40-amp on 2001) and fuse "E" (40-amp) in power distribution center located in engine compartment. See Fig 1. Also check fuse No. 21 (10-amp) in junction block located above left kick panel. See Fig 2.
- If battery voltage is not present, repair shorted or open Red/Light Green wire circuit. If battery voltage is present, remove low speed or high speed fan motor relay. Using an ohmmeter, ensure continuity exists between relay terminals No. 1 and 3. See Fig 3. If continuity does not exist, replace relay.
- Connect a fused jumper wire between battery voltage and terminal No. 1, and ground terminal No. 3. Check continuity between relay terminals No. 2 and 4. Continuity should exist with battery connected. Continuity should not exist with battery disconnected. Replace relay if continuity is not as specified.