Engine Controls - System/Component Tests - 4.0L

• Introduction
• Component Locations
• Electronic Control Unit (Ecu)
  • Notes
  • Ground Circuits
  • Power Circuits (4.0L)
• Closed Throttle (Idle) Switch Functional Test
• Coolant Temperature Sensor (Cts) Test
• Crankshaft Position Sensor (Cps) Test
• Evaporative Fuel System
• Exhaust Gas RECIRCULATION (EGR) System
  • EGR Solenoid Vacuum Test
  • EGR Valve Vacuum Test
  • EGR Valve Opening Test
  • EGR Valve Closing Test
  • EGR Transducer Vacuum Test
• Fuel Delivery
• Idle Speed Test
  • Notes
  • Idle Speed Actuator (ISA) Motor Test
• Knock Sensor Functional Test
• Manifold Air/Fuel Temperature Sensor
• Manifold Absolute Pressure Sensor Functional Test
• Oxygen (O2) Sensor Heating Element
  • Notes
  • Resistance Test (CHEROKEE & COMANCHE)
  • Resistance Test (Wrangler)
• Positive Crankcase Ventilation (PCV) System
  • System Test
• Spark Plug Check
• Sync Pulse (Stator) Test
• Thermostatic Air Cleaner System
  • Air Valve Vacuum Motor Test
• Throttle Position Sensor (TPS)
  • Functional Test