ECI CEC System: Diagnosis: Self-Diagnosis: Notes

The Self-Diagnosis system monitors by the computer (ECU) the input signal from each sensor. If any abnormality occurs in input signal, the abnormal item is memorized by the computer (ECU). The 9 diagnosis items are items including normal operating conditions and can be confirmed by using a voltmeter. See Fig 1 and Fig 2 .

Fig 1: Chrysler Corp. Diagnosis Connector

Fig 2: Mitsubishi Diagnostic Components

The abnormality-diagnosis memory is kept by direct power supply from the battery. Memory of diagnosis result is not erased by turning off ignition switch but will be erased if back-up power supply is turned off by disconnection of battery cable or ECU unit.