JPS5647805A - Self-diagnostic method of air fuel ratio control unit - Google Patents
Self-diagnostic method of air fuel ratio control unitInfo
- Publication number
- JPS5647805A JPS5647805A JP12385779A JP12385779A JPS5647805A JP S5647805 A JPS5647805 A JP S5647805A JP 12385779 A JP12385779 A JP 12385779A JP 12385779 A JP12385779 A JP 12385779A JP S5647805 A JPS5647805 A JP S5647805A
- Authority
- JP
- Japan
- Prior art keywords
- self
- fuel ratio
- air fuel
- ratio control
- diagnosis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Testing Of Engines (AREA)
- Testing And Monitoring For Control Systems (AREA)
Abstract
PURPOSE:To make the maintenance control easy, by performing the self-diagnosis as to the operating condition of an engine by use of a check program stored in the microcomputer. CONSTITUTION:The air fuel ratio control unit is equipped with the rotational frequency detection sensor 22, the absorbing negative pressure sensor 19, and the O2 sensor 16, and the control is performed in accordance with an output of each sensor. The control circuit 3 consists of a microcomputer, an ROM, an RAM, etc., and in addition to the regular air fuel ratio control, it executes a self-diagnosis in the idle operating condition after the engine has been started or the warming up running has been completed. Resulting from the self-diagnosis, in case when some failure has been detected, the display element 30 indicating the abnormal part is turned on. The display can be performed by means of the code No. or the panel.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12385779A JPS5647805A (en) | 1979-09-28 | 1979-09-28 | Self-diagnostic method of air fuel ratio control unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12385779A JPS5647805A (en) | 1979-09-28 | 1979-09-28 | Self-diagnostic method of air fuel ratio control unit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5647805A true JPS5647805A (en) | 1981-04-30 |
JPH0114528B2 JPH0114528B2 (en) | 1989-03-13 |
Family
ID=14871104
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12385779A Granted JPS5647805A (en) | 1979-09-28 | 1979-09-28 | Self-diagnostic method of air fuel ratio control unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5647805A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61253512A (en) * | 1985-05-02 | 1986-11-11 | Nippon Denso Co Ltd | Self-diagnosis device for on-vehicle controller |
JPS61268847A (en) * | 1985-05-21 | 1986-11-28 | Nippon Denso Co Ltd | Control device of internal-combustion engine |
JPS63273037A (en) * | 1987-04-30 | 1988-11-10 | Yanmar Diesel Engine Co Ltd | Engine failure diagnostic instrument |
JPS6418804A (en) * | 1987-07-14 | 1989-01-23 | Diesel Kiki Co | Self-diagnosis device for controller |
US4839811A (en) * | 1986-09-22 | 1989-06-13 | Nissan Motor Company Limited | Automotive vehicle trouble checking apparatus |
JPH0233446A (en) * | 1988-07-22 | 1990-02-02 | Hitachi Ltd | Diagnostic system for engine control device |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH041451A (en) * | 1990-04-17 | 1992-01-06 | Mitsubishi Electric Corp | Trouble diagnoser for engine |
-
1979
- 1979-09-28 JP JP12385779A patent/JPS5647805A/en active Granted
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61253512A (en) * | 1985-05-02 | 1986-11-11 | Nippon Denso Co Ltd | Self-diagnosis device for on-vehicle controller |
JPS61268847A (en) * | 1985-05-21 | 1986-11-28 | Nippon Denso Co Ltd | Control device of internal-combustion engine |
US4839811A (en) * | 1986-09-22 | 1989-06-13 | Nissan Motor Company Limited | Automotive vehicle trouble checking apparatus |
JPS63273037A (en) * | 1987-04-30 | 1988-11-10 | Yanmar Diesel Engine Co Ltd | Engine failure diagnostic instrument |
JPS6418804A (en) * | 1987-07-14 | 1989-01-23 | Diesel Kiki Co | Self-diagnosis device for controller |
JPH0233446A (en) * | 1988-07-22 | 1990-02-02 | Hitachi Ltd | Diagnostic system for engine control device |
Also Published As
Publication number | Publication date |
---|---|
JPH0114528B2 (en) | 1989-03-13 |
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