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Home >> Ford >> 2021 >> Expedition XL, RWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Memory Modules >> Engine Controls - Powertrain DTC Charts & Descriptions (Except Diesel & Hybrid) >> Diagnostic Trouble Code (DTC) Charts And Descriptions >> P1793 - Ignition Supply Malfunction

P1793 - Ignition Supply Malfunction

DTC DESCRIPTION P1793 - IGNITION SUPPLY MALFUNCTION

Description:  The ISP-R circuit is monitored for low and high voltage conditions. This DTC sets when the voltage is less than 7 volts or greater than 16 volts.
Possible Causes: 
  • ISP-R circuit short to voltage
  • ISP-R circuit short to ground
  • Battery or charging system concern
Diagnostic Aids:   
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to Pinpoint Test B.