Diagnostic Formats
WARNING: This page is about a different car, the 1994 Mazda Navajo. However, it is still accessible from the selected car via links, so may be relevant.
QUICK TEST and CIRCUIT TESTS are diagnostic formats used to test and service EEC-IV system. QUICK TEST allows technician to identify problems and retrieve service codes. CIRCUIT TESTS check circuits, sensors and actuators.
Before starting any CIRCUIT TEST, follow all steps under QUICK TEST to find correct CIRCUIT TEST. If vehicle passes QUICK TEST and no driveability symptoms or intermittent faults exist, EEC-IV system is okay.