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Home >> Ford >> 2005 >> Excursion 6.0 P, 4WD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Diagnostic Methods -- 6.0L Diesel (99P F450/550) >> Analyzing Powertrain Control Module (PCM) Data >> Various Data Procedures >> Harness Shorts

Harness Shorts

The purpose is to check the harness for short circuits (to ground or voltage).

  1. Key OFF.
  2. Disconnect the component from the vehicle harness.
  3. Using an ohmmeter, measure the resistance between the signal circuit and signal return circuit, power ground circuit, VREF circuit, or vehicle power.
  4. If the resistance value is less than 10,000 ohms, the 2 circuits are shorted.