MLIT Statutory Recall · Japan

Recall 1147430 — Computer (Engine)

Filed May 14, 2020 · Mitsubishi

Overview

MLIT filing number1147430
TypeStatutory Recall (government-mandated recall)
Date filedMay 14, 2020
Manufacturer(s)Mitsubishi
ComponentComputer (Engine)
Production periodMay 29, 2013 — August 22, 2017
Vehicles affected2,146 units

Defect

On large route buses, the engine ECU control program is improper, allowing peak combustion pressure to exceed the allowable limit for the connecting rod. Continued operation under these conditions causes cracks to develop in the connecting rod. In the worst case, the connecting rod may fracture, rendering the vehicle inoperable and causing a vehicle fire.

Corrective action

Because additional time is required to verify the necessity of inspecting and replacing the connecting rod, all vehicles will receive, as an interim measure, a reprogram of the engine ECU control program with corrected software. A permanent remedy will be implemented once finalized.

Affected models & chassis ranges

This filing lists 9 type code(s). A vehicle is affected if its chassis number falls within one of the ranges below.

Type code (型式)ModelChassis ranges
QDG-MP35FM ふそうエアロスター MP35FM-63002 — MP35FM-63519
QDG-MP35FP ふそうエアロスター MP35FP-63001 — MP35FP-63533
QKG-MP35FK ふそうエアロスター MP35FK-63001 — MP35FK-66030
QKG-MP35FM ふそうエアロスター MP35FM-63001 — MP35FM-66134
QKG-MP35FP ふそうエアロスター MP35FP-63003 — MP35FP-66109
QKG-MP37FK ふそうエアロスター MP37FK-63001 — MP37FK-63549
QKG-MP37FM ふそうエアロスター MP37FM-63001 — MP37FM-63518
QKG-MP38FK ふそうエアロスター MP38FK-64011 — MP38FK-66439
QKG-MP38FM ふそうエアロスター MP38FM-64001 — MP38FM-66176

Original Japanese (MLIT source text)

Show the original Japanese filing text

状況

大型路線バスにおいて、エンジンECUの制御プログラムが不適切なため、最大燃焼圧力がコンロッドの許容限度を超える場合がある。そのため、そのままの状態で使用を続けると、コンロッドに亀裂が生じ、最悪の場合、コンロッドが破損して走行不能及び火災に至るおそれがある。

改善措置

コンロッドの点検及び交換の必要性について検証に時間を要するため、全車両、暫定措置として、エンジンECUの制御プログラムを対策品に書き換える。  なお、対策が決定次第、恒久対策を実施する。

Source & verification

This entry reproduces public data from Japan's MLIT recall registry. English text is jdmvin.com's own translation; always verify against the official source:

https://renrakuda.mlit.go.jp/renrakuda/ris-detail-car.html?class=recalldatacar&id=3004747

Check your own vehicle: to see whether this filing affects a specific chassis number — and find every other recall for it — use the chassis lookup on the home page.

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