Overview
| MLIT filing number | 1132450 |
|---|---|
| Type | Statutory Recall (government-mandated recall) |
| Date filed | October 22, 2013 |
| Manufacturer(s) | Hino |
| Component | Exhaust Emission Reduction Device |
| Production period | July 13, 2010 — September 2013 |
| Vehicles affected | 236 units |
Defect
On large route buses, an incorrect engine control program allows post-injection fuel from automatic DPR (exhaust gas purification device) regeneration during vehicle standstill to enter the EGR circuit, where it is cooled by the exhaust gas recirculation (EGR) cooler. This generates and accumulates carbon deposits that progressively block the EGR cooler. Continued operation under this condition causes turbine blade damage, illuminates the engine check lamp, and results in insufficient power output. In the worst case, the vehicle may be unable to travel normally.
Corrective action
On all vehicles, reprogram the engine control program, replace the exhaust brake with the corrected part, and replace the EGR cooler, EGR valve, turbocharger, and EGR pipe with new parts.
Affected models & chassis ranges
This filing lists 4 type code(s). A vehicle is affected if its chassis number falls within one of the ranges below.
| Type code (型式) | Model | Chassis ranges |
|---|---|---|
| LJG-HU8JLGP | Blue Ribbon City | HU8JLG-40011 — HU8JLG-40162 |
| LJG-HU8JMGP | Blue Ribbon City | HU8JMG-40011 — HU8JMG-40113 |
| LNG-HU8JLGP | Blue Ribbon City | HU8JLG-40011 — HU8JLG-40162 |
| LNG-HU8JMGP | Blue Ribbon City | HU8JMG-40011 — HU8JMG-40113 |
Original Japanese (MLIT source text)
Show the original Japanese filing text
状況
大型路線バスにおいて、エンジンの制御プログラムが不適切なため、停車中のＤＰＲ（排出ガス浄化装置）の自動再生時のポスト噴射による燃料がＥＧＲ回路に廻り込み、排気ガス再循環（ＥＧＲ）クーラで冷却され、カーボンデポジットが生成、堆積することでＥＧＲクーラが閉塞するものがある。そのため、そのまま使用を続けると、ターボのタービン翼が欠損し、エンジンチェックランプが点灯するとともに出力不足になり、円滑な走行が出来なくなるおそれがある。
改善措置
全車両、エンジンの制御プログラムを書き換えるとともに、エキゾーストブレーキを対策品に交換、ＥＧＲクーラ、ＥＧＲバルブ、ターボ、ＥＧＲパイプを新品に交換する。
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=3003138