Section 7 (Engine Controls - Basic Diagnostic Procedures - 4.3L)

• Model Identification
• Introduction
• Preliminary Inspection & Adjustments
  • Visual Inspection
  • Mechanical Inspection
    • Compression
    • Exhaust System Backpressure
    • Check At Oxygen Sensor
    • Diagnosis
• A-3, No-Start Diagnosis
  • Definition
  • No Start - Engine Cranks Okay (HEI-Est)
    • General Inspection
    • Ignition System
    • Fuel System (TBI)
    • Fuel System (CPI 4.3L VIN W)
  • No Start - Engine Cranks Okay (Enhanced/High Value Ignition System)
    • General Inspection
    • Ignition System
    • Fuel System (CPI)
• A-4 Injector Circuit Diagnosis
• A-7, Basic Fuel System Checks
  • Fuel System Pressure Relief
    • Notes
    • CPI (4.3L VIN W)
    • TBI Unit
  • Fuel System Pressure Test
    • Notes
    • CPI (4.3L VIN W)
    • TBI
  • Field Service Mode Check
• A-8, Injector Coil Test
• C-4, Basic Ignition System Checks
  • Enhanced/High Value Ignition System (OBD-II)
    • Notes
    • Spark
    • Ignition Coil Power Source
  • HEI-Est Distributor
    • Notes
    • Spark
    • Ignition Coil Power Source
    • Ignition Coil Resistance
    • Distributor Pick-Up Coil Short & Resistance Checks
    • Tach Pulse (RPM) Signal
• Idle Speed & Ignition Timing
• Diagnostic Circuit Check
  • Diagnostic circuit check determines the following:
  • A-1, Malfunction Indicator Light (Mil) Inoperative
  • A-2, Mil Always On Or Won't Flash Code 12
• On-Board Diagnostic (OBD) System Check
  • Notes
  • The OBD System Check determines:
  • A-1, Malfunction Indicator Light (Mil)
  • A-2, No Scan Tool Data
• Diagnostic Circuit Check & Work Flow Chart
• Summary
• Wiring Diagrams
  • Astro & Safari
  • "C" & "K" Series With A/T
  • "C" & "K" Series With M/T
  • "P" Series With M/T
  • "P" Series Commercial & MOTORHOME - With 4L80-E
  • "S" & "T" Series - With Pcm
  • "S" & "T" Series - With VCM
  • "S" & "T" Series With Pcm
  • "S" & "T" Series With VCM
  • Van With 4L60-E
  • Van With 4L80-E