Japan
Published 19 Oct 2023
Ref JP-1153940
Mitsubishi: Exhaust Gas Reduction Device
Translated from Japanese · machine translation
- Country
- Japan
- Published
- 19 Oct 2023
- Units affected
- 260
- Reference
- JP-1153940
Affected vehicles
Mitsubishi Fuso Aero Star 2022–2023
Hazard
In large-capacity route buses, the connector terminal arrangement of the electric water pump for cooling the urea water injection unit is improper. When the DPF is at high temperature immediately after engine shutdown, the water pump does not operate, causing the urea water valve in the injection unit to be inadequately cooled and thermally damaged. Continued operation in this condition allows urea water to leak, and in the worst case, exhaust gas treatment may not be performed properly.
Show original (日本語)
大型路線バスにおいて、尿素水噴射ユニット冷却用電動ウォーターポンプのコネクタ端子の配列が不適切なため、エンジン停止直後のＤＰＦ高温時に当該ウォーターポンプが作動せず、尿素水噴射ユニットの尿素水バルブが冷却されず溶損する。そのため、そのままの状態で使用を続けると、尿素水が漏れだし、最悪の場合、排気ガス浄化処理が適切に行われないおそれがある。
Remedy
For all vehicles, correct the connector terminal arrangement of the electric water pump for cooling the urea water injection unit to the proper configuration, and replace the entire urea water injection unit assembly with new parts.
Show original (日本語)
全車両、尿素水噴射ユニット冷却用電動ウォーターポンプのコネクタ端子の配列を正規状態に修正し、尿素水噴射ユニット一式を新品に交換する。