2.9L EFI EEC IV Testing: Self-Diagnostics: Notes

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

If vehicle passes KEY ON/ENGINE OFF SELF-TEST  ,KEY ON/ENGINE RUNNING SELF-TEST  , and CONTINUOUS SELF-TEST  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 those tests that are specified by the failed step.