Honda Motor Co., Ltd.

Kensuke Yagi

Wataru Endo

Masami Haishima

Katsuhisa Doi

Hiroshi Ito

Koji Watanabe

Masahiko Asakura

Ryuji Sato

Hiroshi Yoneguchi

Naoki Kawahara

In a vehicle diagnostic system and a vehicle diagnostic method, malfunction codes recorded in each ECU in a vehicle include idle stop malfunction codes that disallow idle stop, and a non-idle stop malfunction code that does not disallow idle stop. The idle stop malfunction codes include: a first idle stop malfunction code that operates a warning light provided corresponding to a specific ECU; and a second idle stop malfunction code that does not operate the relevant warning light. An external diagnostic device extracts, from the plurality of ECUs, only the second idle stop malfunction codes, among the first idle stop malfunction codes and the second idle stop malfunction codes, when performing malfunction diagnosis for non-execution of idle stop.

Vehicle diagnostic system, vehicle diagnostic method, and external diagnostic device

Provided are a vehicle configured such that if idling does not automatically stop, an in-vehicle display will occur immediately if a malfunction is the cause, thereby enabling a driver to have peace of mind and concentrate on driving, without giving the driver an unnecessary sense of unease; a vehicle diagnostic system therefor; and a vehicle diagnostic method. The vehicle comprises an idle stop error display unit provided corresponding to a specific ECU among a plurality of ECUs, and that indicates that an idle stop malfunction has occurred, being a malfunction corresponding to a second IS malfunction code, when a malfunction has occurred within a control target range for any among the plurality of ECUs, said malfunction recording the second IS malfunction code which does not cause the operation of a warning light requesting inspection or repair of an error that has occurred inside the vehicle.

Vehicle diagnostic system, vehicle diagnostic method, and vehicle

In the present fault diagnosis method and the fault diagnosis system for an engine, an external diagnosis device: obtains continuous data on the incidences of misfire by misfiring cylinders from the vehicle's side with regard to the actually occurring misfire or past incidences of misfire; detects a misfire pattern, which is to be classified according to the presence of continuous incidences of misfire, on the basis of the continuous data; and narrows down a fault site in accordance with the misfire pattern.

Fault diagnosis method, fault diagnosis system, and fault diagnosis device for engine

Provided are a vehicle diagnostic system, a vehicle diagnostic method, and an external diagnostic device that are capable of readily or promptly confirming or diagnosing whether or not a malfunction related to non-execution of idle stop in a vehicle having an idle stop control system has occurred. The external diagnostic device has recorded therein a plurality of idle stop conditions for executing idle stop of an engine in a vehicle. Idle stop conditions that are not fulfilled when idle stop has not executed are displayed in a prescribed display unit, when stopping the vehicle when the external diagnostic device has been connected to the vehicle and the vehicle has been driven.

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Fujimi, Japan

Kensuke Yagi