Diagnostic Test
- RADIATOR FAN OPERATION NOTE:
Diagnose and repair any Radiator Fan Relay Control circuit DTCs before proceeding with this test procedure.
- Turn the ignition on, engine not running.
- Using a scan tool, actuate the low speed fan.
- Using a scan tool, actuate the high speed fan.
Do the fans operate in both speeds?
Yes
- The Radiator Fans are operating normal at this time.
- Perform the INTERMITTENT CONDITION test procedure. For 3.6L, refer to INTERMITTENT CONDITION . For 5.7L, refer to INTERMITTENT CONDITION . For 6.2L, refer to INTERMITTENT CONDITION . For 6.4L, refer to INTERMITTENT CONDITION .
No
- Go To 2
- PERFORM THE FOLLOWING DIAGNOSTIC CHECKS BASED ON THE RADIATOR FAN OPERATION
Fan Operation during actuation Recommended diagnostics Only the Radiator Fan Motor connected to the (N24) circuit operates during low speed and high speed operation - Check the (N23) circuit for a short to ground
- Check the Radiator Fan Motor connected to the (N23) circuit for an internal short
Only the Radiator Fan Motor connected to the (N24) circuit operates during low speed, but both fans operate during high speed operation - Check the (N210) circuit for a short to ground
- Check the Radiator Fan Motor connected to the (N23) circuit for an internal short
Both Radiator Fans operate during low speed, but only the Radiator Fan Motor connected to the (N24) circuit operates during high speed operation - Check the Radiator Fan High Relay operation
Both Radiator Fans operate during low speed, but only the Radiator Fan Motor connected to the (N23) circuit operates during high speed operation - Check the Radiator Fan Relay operation
- Check for an open or high resistance in the (Z901) Ground circuit
Neither Radiator fans operates during low speed, but the Radiator Fan Motor connected to the (N24) circuit operates during high speed operation - Check for an open or high resistance in the (N23) circuit
- Check for an open or high resistance in the Radiator Fan Motor
- Check for an open or high resistance in the Radiator Fan Motor (Z903) Ground circuit
Neither Radiator fans operates during low speed, but the Radiator Fan Motor connected to the (N23) circuit operates during high speed operation - Check for an open or high resistance in the (N24) circuit
- Check for an open or high resistance in the (N210) circuit