EEC-IV Theory/Operation

• Description
  • Notes
  • ECA Location
• Operation
  • Notes
  • ECA Input Sensors
    • A/C Compressor Clutch Signal
    • Air Charge Temperature (ACT) Sensor
    • Brake On/Off (BOO) Switch
    • EEC Power Relay
    • EGR Valve Position (EVP) Sensor
    • Engine Coolant Temperature (ECT) Sensor (All Engines)
    • Knock Sensor
    • Manifold Absolute Pressure (MAP) Sensor
    • Neutral Drive Switch (NDS) & Neutral Gear Switch (NGS)
    • Heated Oxygen (HEGO) Sensor
    • Profile Ignition Pick-Up (PIP) (All Engines)
    • Power Steering Pressure Switch (PSPS)
    • Self-Test Input (STI)
    • Throttle Position (TP) Sensor
    • Vehicle Speed Sensor (VSS)
  • ECA Output Controlled Components
    • Wide Open Throttle A/C (WAC) Cut-Off
    • Canister Purge Solenoid (CANP)
    • EGR Control (EGRC) Solenoid
    • EGR Shut-Off (EGRSO) Solenoid
    • EGR Vent (EGRV) Solenoid
    • EGR Vacuum Regulator (EVR)
    • Fuel Injectors
    • Fuel Pump Relay
    • Idle Speed Control By-Pass Air
    • Self-Test Output (STO) (All Engines)
    • Spark Output (SPOUT)
• Diagnosis & Testing
  • Diagnostic Formats
  • Retrieving & Clearing Codes
  • Test Equipment
  • Reading Diagnostic Codes
    • KOEO and KOER SELF-TEST Codes
    • Separator Pulse
    • Continuous Memory Codes
    • Fast Codes
• Quick Test
  • Description
  • KOEO & KOER Self-Test Description
  • Visual Check & Vehicle Preparation
  • Self-Test Connector Location
  • Equipment Hook-Up
    • Analog Volt/Ohmmeter (VOM)
    • Star Tester
    • "CHECK ENGINE" Light (MIL)
    • Overdrive Cancel Indicator Light (OCIL) & Transmission
  • Key On Engine Off (KOEO) Self-Test
    • Test Procedure
    • No Starts (Except Diesel)
    • No Codes Displayed Or Codes Displayed Not Listed
  • Computed Timing Check
  • KOER Self-Test
    • Description
    • Engine ID Codes
    • Dynamic Response or Wide Open Throttle (WOT) Check
    • Test Procedure
  • Continuous Monitor Mode (Wiggle Test)
    • Notes
    • KOEO "Wiggle" Test Procedure
    • KOER "Wiggle" Test Procedure
• Diagnosis By Symptom
  • Notes
  • Diagnostic Aids
    • Notes
    • Output State Check
    • Failure Mode Effects Management (FMEM), Code 98
• ECA Pin Voltage & Resistance Checks
  • Notes
  • Engine Coolant Temperature (ECT) Sensor
  • Distributor Position (PIP)
  • Vehicle Speed Sensor (VSS)
  • Knock Sensor (KS)
• EEC-IV Abbreviations
• Wiring Diagrams