Engine Controls - System/Component Tests

• Introduction
• General Motors A & C Chart Reference
• Computerized Engine Controls
  • Control Unit
    • Ground Circuits
    • Power Circuits
• Engine Sensors & Switches
  • Notes
  • A/C On (A/C Request) Switch Test
  • A/C Pressure Sensor
  • A/C Pressure Switch
  • Brake Switch
  • Coolant Temperature Sensor (Cts)
  • Crankshaft Position Sensor (Dis)
  • Crankshaft Position Sensor (IDI)
  • Dual Crank (Combination) Sensor (C3I)
  • Intake Air Temperature Sensor
  • Knock Sensor
  • Manifold Absolute Pressure (Map) Sensor (C-1)
  • Manifold Air Temperature (Mat) Sensor
  • Mass Airflow (MAF) Sensor (3.3L)
  • Oxygen (O2) Sensor
  • Park/Neutral (P/N) Switch (C-1)
  • Power Steering (P/S) Pressure Switch (C-1)
  • Throttle Position Sensor (TPS)
  • Vehicle Speed Sensor (Pm Generator Type)
  • Vehicle Speed Sensor (Led Type)
• Motors, Relays & Solenoids
  • Motors
    • Idle Air Control (IAC) Motor & Idle Speed Control (ISC) Motor
  • Relays
    • A/C Clutch Relays
    • Fuel Pump Relay
  • Solenoids
    • Notes
    • Air Injection Solenoids
    • Canister Purge Solenoid
    • EGR Solenoid
• Fuel System
  • Fuel Delivery
    • Notes
    • Fuel Pressure Regulator (PFI)
    • Fuel Pressure Regulator (TBI)
    • Fuel Pump Relay (A-5)
    • Fuel Pump Relay By-Pass Procedure
    • Oil Pressure Switch Fuel Pump Back-Up
  • Fuel Control
    • Fuel Injector(s)
    • PFI Injector Balance Test (C-2)
    • Oxygen Sensor
• Idle Control System (C-2)
  • Engine Controls - System/Component Tests
    • Idle Air Control (IAC) Motor
• Ignition System (C3I)
  • Chart C-4-1 (Misfire At Idle 3.3L VIN N)
  • Chart C-4-2 (Misfire Under Load 3.3L VIN N)
    • Notes
    • If OK
    • Cylinder Pair Not Firing (1-4, 2-5 or 3-6)
    • Single Cylinder or Unpaired Cylinders Not Firing
• Emission Systems & Sub-Systems
  • Air Injection (C-6)
    • Air Pump (Belt-Driven)
    • Check Valve
  • Exhaust Gas RECIRCULATION (C-7)
    • Notes
    • System Test (Vacuum Operated)
    • EGR Control Solenoid (Normally Closed)
    • EGR Control Solenoid (Normally Open)
    • Positive Backpressure EGR Valve
    • Negative Backpressure EGR Valve
  • Fuel Evaporation Control (C-3)
    • Notes
    • Canister Purge Solenoid (Normally Closed)
    • Fuel Tank Pressure Control Valve
  • Positive Crankcase Ventilation (PCV)
    • Required Service
    • Checking PCV Valve Function
  • Thermostatic Air Cleaner
    • Temperature Sensor (Vacuum Motor Type)
    • Vacuum Motor Diaphragm
• Miscellaneous Controls
  • Notes
  • Hot Light Or Coolant Temperature Light
  • Transmission (C-8)
    • Converter Clutch Solenoid
    • Converter Lock-Up Signal At Transmission
    • Converter Lock-Up Signal From ECM
  • A/C Clutch (C-10) & Electric Cooling Fan (C-12)
    • Notes
    • A/C Clutch Relay
    • Cooling Fan System & Quad-Driver Check
    • Cooling Fan Relay
    • Cooling Fan Motor
  • Chart C-12, 2.5L "A" Body, Cooling Fan
    • Notes
    • Diagnostic Aids
  • Chart C-10, 2.5L, A/C Clutch CTRL CKT Diagnosis
    • Notes
    • Diagnostic Aids
  • Chart C-12A, 3.3L (1 Of 3), Cooling Fan CKT Diagnosis
    • Notes
    • Diagnostic Aids
  • Chart C-12A, 3.3L (2 Of 3), Cooling Fan Inoperative
  • Chart C-12A, 3.3L (3 Of 3), Cooling Fan On At All Times
    • Notes
    • Diagnostic Aids
  • Chart C-10, 3.3L (1 Of 2), A/C Clutch CTRL CKT Diagnosis
  • Chart C-10, 3.3L (2 Of 2), A/C Clutch CTRL CKT Diagnosis
• Component Locations
• Wiring Diagrams