With Scan Tool

NOTE: Correct results of the quick tests are dependent on the proper operation of related non-EEC-IV components.
It may be necessary to disconnect or disassemble harness connector assemblies to do some of the inspections. Pin locations should be noted prior to disassembly.

1. Turn OFF the ignition, place the transmission in PARK (A/T) or NEUTRAL (M/T), and place blocks around a wheel.
2. Inspect the air cleaner and inlet ducting.
3. Check all engine vacuum hoses for damage, leaks, cracks, blockage, proper routing, etc.
4. Check EEC-IV system wiring harness for proper connections, bent or broken pins, corrosion, loose wires, proper routing, etc.
5. Check the Electronic Control Assembly (ECA), sensors, and actuators for physical damage.
6. Check the engine coolant for proper level.
7. Check the transmission fluid level and quality.
8. Make all necessary repairs prior to continuing with test preparation.
9. Turn off all electrical loads (radios, lights, A/C-heater blower fans, etc.).
10. Turn the ignition switch OFF.
11. Connect the scan tool to the diagnostic connector.
12. Connect a timing light to the engine.
13. Continue with Key On Engine Off Self Test.