Engine Control System - Basic Diagnostic Procedures

• Model Identification
• Introduction
• Preliminary Inspection & Adjustments
  • Visual Inspection
  • Mechanical Inspection
    • Compression
    • Exhaust System Backpressure
    • Diagnosis
• No Start Diagnosis
  • Notes
  • No Start - Engine Cranks Okay (1.9L)
    • Notes
    • General Inspection
    • No RPM Detected Diagnosis
    • Ignition Diagnosis
    • Fuel Delivery Diagnosis
  • No Start - Engine Cranks Okay (2.2L - Cavalier & SUNFIRE)
    • Notes
    • General Inspection
    • Ignition Circuit
    • Fuel Pump Electrical Circuit
    • Diagnostic Aids
  • No Start - Engine Cranks Okay (2.2L - SATURN)
    • Notes
    • General Inspection
    • PCM Input Circuits
    • Ignition Module Circuits
    • Fuel System Circuits
    • Ignition Coil Circuits
  • No Start - Engine Cranks Okay (2.4L)
    • Notes
    • General Inspection
    • Ignition Circuit
    • Fuel Pump Electrical Circuit
  • No Start - Engine Cranks Okay (3.0L - CATERA)
    • Notes
    • General Inspection
    • Fuel Pump Electrical Circuit
    • Ignition Circuit
  • No Start - Engine Cranks Okay (3.0L - SATURN)
    • Notes
    • General Inspection
    • ECM Input Circuits
    • Fuel Delivery System
    • Ignition System
  • No Start - Engine Cranks Okay (3.1L & 3.4L)
    • Notes
    • General Inspection
    • Ignition System
    • Fuel Pump Electrical Circuit
  • No Start - Engine Cranks Okay (3.5L)
    • Notes
    • General Inspection
    • Fuel Pump Electrical Circuit
  • No Start - Engine Cranks Okay (3.8L)
    • Notes
    • General Inspection
    • Ignition System
    • Fuel Pump Electrical Circuit (VIN K)
    • Fuel Pump Electrical Circuit (VIN 1)
  • No Start - Engine Cranks Okay (4.6L)
    • Notes
    • General Inspection
    • Ignition System
    • Fuel Pump Electrical Circuit
  • No Start - Engine Cranks Okay (5.7L)
    • Notes
    • General Inspection
    • Ignition System ("F" Body)
    • Ignition System ("Y" Body)
    • Fuel Pump Electrical Circuit ("F" Body)
    • Fuel Pump Electrical Circuit ("Y" Body)
• Basic Fuel System Checks
  • Notes
  • Fuel System Pressure Relief (Except SATURN)
  • Fuel System Pressure Relief (SATURN)
  • Fuel System Pressure Test (Except SATURN)
  • Fuel System Pressure Test (SATURN)
• Basic Ignition System Checks
  • Notes
  • Dis (1.9L, 2.2L, 3.0L, 3.1L, 3.4L, 3.5L, 4.6L & 5.7L)
    • Spark
    • Ignition Coil Power Source
    • Ignition Coil Resistance (Except 1.9L)
    • Ignition Coil Resistance (1.9L)
    • Ignition Relay Circuit (5.7L - "F" Body)
    • Ignition Relay Circuit (5.7L - "Y" Body)
    • Crankshaft Position (CKP) Sensor Output Signal
    • Tach Pulse (RPM) Signal
  • IDI (2.4L)
    • Spark
    • Ignition Coil Power Source
    • Ignition Coil Resistance
    • Crankshaft Position (CKP) Sensor Short & Resistance Checks
    • Crankshaft Position (CKP) Sensor Output Signal
    • Tach Pulse (RPM) Signal
  • C I (3.8L)
    • Spark
    • Ignition Coil Power Source
    • Ignition Coil Resistance
    • Tach Pulse (RPM) Signal
• Engine Controls Circuit Checks
  • Notes
  • Power Relay Circuit (CATERA)
• Idle Speed & Ignition Timing
• Summary