Diagnostic Procedure

The 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 component tests. To test and service EEC-IV system, perform the QUICK TEST first.

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