Engine Controls - Basic Diagnostic Procedures

• Introduction
• Preliminary Inspection & Adjustments
  • Visual Inspection
  • Mechanical Inspection
    • Compression
    • Exhaust System Backpressure
• Fuel System Preliminary Checks
  • Notes
  • Engine Does Not Crank
  • Engine Cranks But Will Not Start
• Fuel Pressure Check
  • Notes
  • Fuel Pump Pressure
  • Injector Check
  • Injector Circuit
  • Inertia Switch
• Thick Film Ignition IV (TFI) Ignition System Checks
  • Spark Check
• Dis Ignition System Check - No Start (2.3L)
  • DISTRIBUTORLESS Ignition System (Dis) - No Start Check (2.3L)
  • Test 1, Check ECA For Fault Codes
  • Test 2, Check For Spark During Crank
  • Test 3, Check Dis Module Pip Out
  • Test 4, Check Pip Out Continuity
  • Test 5, Determine Missing Spark Combination
  • Test 6, Check Plugs & Wires
  • Test 7, Check Dis Module VBAT
  • Test 8, Check Dis Module Ignition Ground
  • Test 9, Check Dis Module Mounting Screws
  • Test 10, Check Right Coil Pack Circuits
  • Test 11, Right Coil Pack Fault, Isolate Dis Module
  • Test 12, Check Right Coil Pack VBAT
  • Test 13, Check Right Coil Circuit
  • Test 14, Check Pip D At Dis Module
  • Test 15, Check Dis Module Coil Drivers
  • Test 16, Check Right Coil Pack VBAT
  • Test 17, Check Right Coil Circuit
  • Test 18, Check Right Coil Circuit
  • Test 19, Isolate Dis Module From Pip D
  • Test 20, Check Crankshaft Sensor VBAT
  • Test 21, Check Crankshaft Sensor Ignition Ground
  • Test 22, Check Crankshaft Sensor Pip S
  • Test 23, Check Pip Circuit For Short To Ground
  • Test 24, Check Pip Circuit For Short To VBAT
  • Test 25, Check Crankshaft Vane
  • Test 26, Isolate EEC-IV Processor (ECA) From Pip Circuit
  • Test 27, Check Pip EEC Circuit For Short To VBAT
  • Test 28, Check Pip EEC Circuit For Short To Ground
• DISTRIBUTORLESS Ignition System (Dis) - No Start (4.0L)
  • Notes
  • Test 1, Check ECA For Fault Codes
  • Test 2, Check For Spark During Crank
  • Test 3, Check Pip At EDIS Module
  • Test 4, Check Pip Continuity To EEC
  • Test 5, Check IGND At EDIS
  • Test 6, Check IGND Continuity To EEC
  • Test 7, Check Pip At EDIS Module/Isolate EEC
  • Test 8, Check Pip Circuit For Short To Ground
  • Test 9, Check Pip Circuit For Short To Power
  • Test 10, Determine Missing Spark Pattern
  • Test 11, Check Plugs & Wires
  • Test 12, Check VBAT C At Coil
  • Test 13, Check Coil For Failure
  • Test 14, Check GND Continuity To EDIS Module
  • Test 15, Check GND In EDIS Module
  • Test 16, Check VBAT E At EDIS Module
  • Test 17, Check VRS Amplitude At EDIS Module
  • Test 18, Check VRS Bias At EDIS Module
  • Test 19, Check VRS Cranking Voltage At EDIS
  • Test 20, Check VRS Cranking Voltage At Sensor
  • Test 21, Check VR Sensor & Crankshaft Wheel
  • Test 22, Check VRS+ Circuit For Open
  • Test 23, Check VRS- Circuit For Open
  • Test 24, Check VRS Circuit For Short To Power
  • Test 25, Check VRS- Circuit For Short To Ground
  • Test 26, Check VRS+ Circuit For Short To Ground
  • Test 27, Check VRS+ Circuit For Short To Power
  • Test 28, Check VRS Bias At EDIS Module
  • Test 29, Check VRS+ Circuit For Short To Power
  • Test 30, Check VRS+ Circuit For Short To Power
  • Test 31, Check VRS- Circuit For Short To Power
  • Test 32, Check VRS- Circuit For Short To Ground
• Ignition Coil Resistance
• Idle Speed & Ignition Timing
• Throttle Position Sensor (TPS) Adjustment
• Summary