LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Jeep >> 2003 >> Grand Cherokee 4WD V8-4.7L >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Relays and Modules - Computers and Control Systems >> Engine Control Module >> Testing and Inspection >> Component Tests and General Diagnostics
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Component Tests and General Diagnostics

Test 1 - 3:






SYMPTOM
CHECKING THE PCM POWER AND GROUNDS

POSSIBLE CAUSES
- (A7) PCM fused B+ circuit
- (F991) PCM fused ignition switch output circuit
- (Z81,Z82) PCM ground circuits
scientia non olet · About LEMON Manuals