Visual Check & Vehicle Preparation

Before hooking up any equipment to diagnose EEC system, visually check the following and perform the 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 for A/T vehicles, and Neutral for M/T vehicles. 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 proper routing.
• Check ECA, 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 idle until upper radiator hose is hot and pressurized. Check for leaks around exhaust manifold and exhaust gas oxygen sensor.