Diagnostic Aids
WARNING: This page is about a different variant/trim than selected.
- The ECM has the capability of providing command to the fan relays even when a scan tool output control is being used. Always refer to the fan control command parameters on the scan tool to know which fans are being commanded ON by the ECM.
- The scan tool cooling fan output control operates as follows:
- Fan Relay 1 operates both fans at a low speed
- Fan Relay 2 operates both fans at medium speed
- Fan Relays 1, 2, and 3 operates both fans at high speed