EEC Electronic Control Assembly (ECA) Test
Due to the complexity of the EEC system, two special diagnostic aids are required. One is a digital Volt/Ohmmeter. This is a highly accurate, high input impedance meter that is more accurate than the conventional Volt/Ohmmeter using a needle.
The second diagnostic aid is the special EEC System Diagnostic Tester for the specific system being tested. The testers plug into the vehicle harness between the EEC ECA and the vehicle's wiring harness. Testing instructions are given in the operator's manual furnished with the tester. Diagnostic limits for spark advance and EGR valve position sensor are located on vehicle emission control information decal on engine valve cover.
Other equipment needed to test the EEC ECA includes a timing light compatible with the Dura-Spark system, a pressure/vacuum gauge and an accurate tachometer.