Visual Check & Vehicle Preparation
Before hooking up any equipment to diagnose EEC system, visually check following and perform preparation procedures:
- Perform all necessary safety precautions to prevent personal injury or vehicle damage.
- Block drive wheels. Set parking brake. Place shift lever in Park (A/T) or Neutral (M/T). DO NOT move shift lever during test unless specifically directed to do so.
- Check condition of air cleaner and air ducting.
- Check all vacuum hoses for leaks, restrictions and proper routing.
- Check EEC system wiring harness connections for corrosion, damaged pins, loose wires and improper routing.
- Check PCM, sensors and actuators for physical damage.
- Check engine coolant and oil level.
- Check battery condition. Turn off all lights and accessories. Ensure vehicle doors are closed when measuring voltage.
- Ensure engine is at operating temperature.
- Check exhaust system for leaks.