Visual Check & Vehicle Preparation

Before hooking up any equipment to diagnose EEC system, visually check following and perform preparation procedures:

• Check condition of air cleaner and air ducting.
• 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 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.
• Turn off all lights and accessories. Ensure vehicle doors are closed when measuring voltage or resistance.
• Start engine, and allow it to idle until upper radiator hose is hot and pressurized. Check for leaks around exhaust manifold and exhaust gas oxygen sensor.