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Testing & Diagnosis: Self-Diagnosis: Notes

The Self-Diagnosis system, an integral part of the computer (ECU), monitors all input signals from each sensor. If an abnormal input signal occurs, that item is memorized by the computer (ECU). There are 8 diagnostic codes (9 for Colt) including normal operating condition. They can be confirmed by using a voltmeter (Colt, Conquest) or an ECI checker with adapters (Cordia, Mirage, Starion, Tredia). See Fig 1 and Fig 2 .

Fig 1: Chrysler Motors Diagnosis Connector
G42547
Fig 2: Mitsubishi Diagnostic Components
G42548

The ECU memory is kept by direct power supply from the battery. Memory is not erased by turning off ignition switch but will be erased if back-up power supply is eliminated by disconnecting battery cable or ECU unit.

NOTE: Memory will not be erased if power supply is returned within 10 seconds after turning off power supply of ECU.
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