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 System Diagnosis
    • Fuel Delivery Diagnosis
  • No Start - Engine Cranks Okay (2.2L & 2.4L - ALERO, Cavalier, Grand Am & SUNFIRE)
    • Notes
    • General Inspection
    • Ignition System Diagnosis
    • Fuel Pump Electrical Circuit
    • Fuel System Diagnosis
  • No Start - Engine Cranks Okay (2.2L - SATURN)
    • Notes
    • General Inspection
    • No RPM Detected Diagnosis
    • Ignition System Diagnosis
    • Fuel Delivery Diagnosis
  • No Start - Engine Cranks Okay (3.0L - SATURN)
    • Notes
    • General Inspection
    • Ignition System Diagnosis
    • Fuel Delivery System
  • No Start - Engine Cranks Okay (3.1L & 3.4L)
    • Notes
    • General Inspection (3.1L Century & Malibu)
    • General Inspection (3.1L Grand Prix; 3.4L Alero & Grand Am)
    • General Inspection (3.4L Impala & Monte Carlo)
    • Ignition Relay Diagnosis (3.1L Grand Prix; 3.4L Impala & Monte Carlo Only)
    • Fuel Injector Circuit Diagnosis (3.1L & 3.4L)
    • Fuel Pump Electrical Circuit Diagnosis (3.1L Century & Grand Prix; 3.4L Impala & Monte Carlo)
    • Fuel Pump Electrical Circuit Diagnosis (3.1L Malibu; 3.4L Alero & Grand Am)
    • Fuel System Diagnosis (3.1L & 3.4L)
    • Ignition System Diagnosis (3.1L & 3.4L)
  • No Start - Engine Cranks Okay (3.5L & 4.0L Aurora)
    • General Inspection
    • Fuel Pump Electrical Circuit Diagnosis
    • Fuel System Diagnosis
    • Diagnostic Aids
  • No Start - Engine Cranks Okay (3.5L - Intrigue)
    • Notes
    • General Inspection
    • Ignition Relay Diagnosis
    • Ignition System Diagnosis
    • Fuel Pump Electrical Circuit Diagnosis
    • Fuel System Diagnosis
  • No Start - Engine Cranks Okay (3.8L)
    • Notes
    • General Inspection (VIN K - Camaro & Firebird)
    • General Inspection (VIN K & 1 - Grand Prix)
    • General Inspection (VIN K - Impala & Monte Carlo)
    • General Inspection (VIN K - Park Avenue)
    • General Inspection (VIN K - LeSabre; VIN 1 - Bonneville & Park Avenue)
    • General Inspection (VIN K & 1 - Regal)
    • Ignition Relay Diagnosis (VIN K - Camaro, Firebird, Impala & Monte Carlo)
    • Ignition Relay Diagnosis (VIN K & 1 - Grand Prix)
    • Ignition Relay Diagnosis (VIN K & 1 - Regal)
    • Ignition System Diagnosis (All Models)
    • Fuel Pump Electrical Circuit (VIN K - Grand Prix)
    • Fuel Pump Electrical Circuit (Except VIN K - Grand Prix)
    • Fuel System Diagnosis (All Models)
    • Fuel Injector Circuit (VIN K - Camaro, Firebird, Impala & Monte Carlo)
    • Fuel Injector Circuit Diagnosis (VIN K & 1 - Bonneville, Grand Prix, LeSabre & Park Avenue)
    • Fuel Injector Circuit Diagnosis (VIN K & 1 - Regal)
  • No Start - Engine Cranks Okay (4.6L)
    • Notes
    • General Inspection
    • Ignition System Diagnosis
    • Fuel Pump Electrical Circuit
  • No Start - Engine Cranks Okay (5.7L)
    • Notes
    • General Inspection
    • Ignition System Diagnosis ("F" Body)
    • Ignition System Diagnosis ("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 Aurora & SATURN)
  • Fuel System Pressure Test (Aurora)
  • Fuel System Pressure Test (SATURN)
• Basic Ignition System Checks
  • Notes
  • Dis (1.9L, 2.2L, 3.0L, 3.1L, 3.4L, 3.5L & 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
• Idle Speed & Ignition Timing
• Summary