Component Tests and General Diagnostics
The cooling fan control system is governed by the PCM and the HVAC system, Chrysler provides related diagnostics for this component. There is PCM fan relay output testing at Computers and Control Systems, Testing and Inspection, Related System Tests, Driveability Component Tests and General DiagnosticsTrouble Code P1491 also concerns the cooling fan motor and relay. For this testing refer to Computers and Control Systems, Testing and Inspection, Trouble Code Diagnostic Charts Testing and Inspection
In addition, refer to the wiring diagrams at Powertrain Management 8w30-3, Electrical Diagrams as well as, Heating and Air Conditioning, 8w42-15