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Home >> Ford >> 2004 >> Excursion 6.8 S, 4WD >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Powertrain DTC Charts & Descriptions - CNG, Flex-Fuel & Gasoline >> Diagnostic Trouble Code (DTC) Charts >> P0243: Supercharger (Boost) Bypass Solenoid Circuit Malfunction

P0243: Supercharger (Boost) Bypass Solenoid Circuit Malfunction

P0243 - SUPERCHARGER (BOOST) BYPASS SOLENOID CIRCUIT MALFUNCTION

Description:  The PCM monitors the supercharger (boost) bypass (SCB) solenoid circuit for an electrical failure. The test fails when the signal moves outside the minimum or maximum allowable calibrated parameters for a specified SCB solenoid duty cycle (100% or 0%) by PCM command.
Possible Causes: 
  • VPWR circuit open to SCB solenoid.
  • SCB solenoid circuit shorted to PWR GND or CHASSIS GND.
  • Damaged SCB solenoid.
  • SCB solenoid circuit open.
  • SCB solenoid circuit shorted to VPWR.
  • Damaged PCM.
Diagnostic Aids:  Disconnect SCB solenoid. Connect test lamp to SCB solenoid harness connector. Cycle SCB driver in PCM by Output Test Mode. Test lamp cycle on and off - SCB solenoid is suspect. Test lamp always on - SCB signal short in harness or PCM. Test always off - SCB signal or VPWR open in harness or PCM.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to PINPOINT TEST KJ: SUPERCHARGER BYPASS CONTROL Step 5.
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