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Home >> Ford >> 2011 >> Focus S, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Powertrain DTC Charts & Descriptions - DTC P164B Through DTC UXXXX - (Except Diesel & Hybrid) >> DTC P1793: Ignition Supply Malfunction

DTC P1793: Ignition Supply Malfunction

P1793 - IGNITION SUPPLY MALFUNCTION

Description:  The powertrain control module (PCM) monitors the ignition switch position run (ISP-R) circuit. This DTC sets if the voltage drops below 7 volts or rises above 16 volts.
Possible Causes: 
  • ISP-R circuit short to ground
  • ISP-R circuit short to voltage
  • Battery or charging system concern
Diagnostic Aids: 
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to PINPOINT TEST B .