Self-Diagnostic System: Introduction

Self-diagnostic system is used for diagnosing malfunctions of Electronic Concentrated Control System (ECCS) sensors and actuators. Electronic Control Unit (ECU) has a number of available diagnostic modes within computer.

There are 2 modes with subdivisions on 300ZX. Before selecting any mode of self-diagnosis, always perform procedures listed in BASIC TESTING article in the ENGINE PERFORMANCE Section. Doing so prevents wasted time and invalid diagnostic results.