Diagnosis system for a motor vehicle

• US 5,038,289 A
• Filed: 03/28/1989
• Issued: 08/06/1991
• Est. Priority Date: 04/04/1988
• Status: Expired due to Term

• Current Assignee: Fuji Jukogyo KK (Subaru Corp.)
• Original Assignee: Fuji Jukogyo KK (Subaru Corp.)
• Inventors: Abe, Kunihiro
• Primary Examiner(s): NOT, DEFINED
• Application Number:
  US07/330,593
• Time in Patent Office: 861 Days
• Field of Search: 364/431.01, 364/424.03, 364/551.01, 73/116, 73/117.2, 73/117.3, 73/119 R, 73/119 A
• US Class Current: 701/99
• CPC Class Codes: F02D 41/22 Safety or indicating devices for abnormal conditions in air/fuel ratio feedback systems F02D41/1495, in electric control linkage F02D11/107, in purge control systems F02M25/0809
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A diagnosis system for diagnosing an electronic control system mounted on a vehicle has a signal transmitter for transmitting a data demand signal and a signal demanding termination of transmission of the data. The electronic control system has a signal receiver for receiving the data demand signal and the transmission terminating demand signal from the diagnosis device, and an interpreter for interpreting the content of the received signals and a signal transmitter for transmitting an output signal to the diagnosis device in accordance with the interpretation.

Claims

1. A diagnosis system for diagnosing an electronic control system for an automotive engine vehicle,

said electronic control system having sensing means for detecting operating conditions of the vehicle and control means for storing input data from said sensing means and providing output data for controlling the vehicle, and

said diagnosis system having a control unit responsive to at least one of said data for diagnosing said at least one data and for providing diagnosis data, display means for displaying said diagnosis data, a keyboard for inputting a diagnosis mode into said control unit, connecting means for connecting said control unit with said electronic control system and a detachable memory cartridge detachably connected to said control unit for storing a plurality of programs for diagnosing said at least one data, system further comprising:

first signal transmitting means provided in the diagnosis system for transmitting a data demand signal and a transmission terminating demand signal to the electronic control system;

signal receiving means provided in the electronic control system for receiving said signals from the diagnosis system;

interpreting means provided in the electronic control system for interpreting a content of the received data demand signal and the transmission terminating demand signal; and

second signal transmitting means provided in the electronic control system for transmitting an output signal to the diagnosis system in accordance with an interpretation through the interpreting means such that a diagnosis operation continues without cutting off power for the electronic control system.

2. The system according to claim 1, wherein the diagnosis system includes a computer having a central processing unit and a memory, the memory having a plurality of diagnosis programs for diagnosing the electronic control system comprising a plurality of electronic control units, and said display means for indicating results of diagnosis.