Diagnostic Procedure

There are 2 diagnostic procedure formats used to test and service the EEC-IV system: QUICK TEST and the specific CIRCUIT TESTS (TEST A1 through TEST D23). A DIAGNOSIS BY SYMPTOM test chart is available to identify specific CIRCUIT TESTS.

Always start with the QUICK TEST procedures before attempting any CIRCUITS TESTS. If a vehicle passes the QUICK TEST procedures the EEC-IV system is okay. Problem exists somewhere else besides the EEC-IV system. If an intermittent driveability problem exists use the KEY ON ENGINE RUNNING (KOER) CONTINUOUS SELF-TEST or WIGGLE TEST to set a code and identify the problem.