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Home >> Jeep >> 1999 >> Grand Cherokee 4WD L6-4.0L VIN S >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Engine Control Module >> Testing and Inspection

Engine Control Module: Testing and Inspection

SYMPTOM
*CHECKING THE PCM POWER AND GROUNDS

POSSIBLE CAUSES
- Fused ignition switch output circuit open
- PCM ground circuit(s) open
- Fused B(+) circuit less than 10.0 Volts