Diagnostic Procedure

This diagnostic procedure is used to test and service the EEC-IV system. It is divided into 2 test formats: QUICK TEST , a functional system test, and CIRCUIT TESTS , a number of specific circuit and components tests. To test and service EEC-IV system, perform the QUICK TEST  first.

If vehicle passes KEY ON/ENGINE OFF (KOEO) , KEY ON/ENGINE RUNNING (KOER) , and CONTINUOUS SELF-TESTS of QUICK TEST  without running any CIRCUIT TESTS , the EEC-IV is okay. Problem exists somewhere else besides the EEC-IV system. If QUICK TEST  fails, perform only these tests that are specified by the failed step.