Malfunction diagnosis system and method for on-vehicle electroni

Details Malfunction diagnosis system and method for on-vehicle electroni Malfunction diagnosis system and method for on-vehicle electroni

1997-02-25

2000-10-03

Cuchlinski, Jr., William A.

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Vehicle diagnosis or maintenance indication

701 33, 34082506, 34082516, G06F 700, G06F 1700

Patent

active

061285609

ABSTRACT:
A diagnosis system for diagnosing malfunctions of on-vehicle electronic control units (ECU) includes a plurality of ECUs and a diagnostic tester. The ECUs are connected to one another, thereby forming a communications network. The ECUs store a data related to malfunctions. A diagnostic tester is connected to an engine ECU for reading the data stored in the ECUs. The tester transmits an initialization signal at a low speed to the ECU when starting communicating with one of the ECUs. The ECU selects a transmission rate between the ECU and the tester based on the initialization signal.

REFERENCES:
patent: 4484263 (1984-11-01), Olson et al.
patent: 5034889 (1991-07-01), Abe
patent: 5739761 (1998-04-01), Kobayashi

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