In October 2020, Isuzu filed a statutory recall with Japan's Ministry of Land, Infrastructure, Transport and Tourism (MLIT) concerning the Exhaust Emission Reduction Device, covering the Erga. The filing affects 4,223 vehicles manufactured between October 15, 2015 and December 11, 2019.
Overview
| MLIT filing number | 1148142 |
|---|---|
| Type | Statutory Recall (government-mandated recall) |
| Date filed | October 1, 2020 |
| Manufacturer(s) | Isuzu |
| Component | Exhaust Emission Reduction Device |
| Production period | October 15, 2015 — December 11, 2019 |
| Vehicles affected | 4,223 units |
Filing in context
The Exhaust Emission Reduction Device is the most frequently cited component category in this archive, appearing in 21 of its 4,890 filings. This filing is one of 34 Isuzu notifications from 2020 in this archive. For scale, 2,035 of the 4,890 filings in this archive report a larger number of affected vehicles; the vehicles involved here were manufactured over a span of about 4 years and 1 month.
Defect
(1) In the bus brake system, the resin piston inside the parking brake relay valve is made of an unsuitable material. Moisture in the air circuit causes the piston to hydrolyze, and brake air pressure can then damage the piston. This may result in air leaking from the brake valve, an inability to release the parking brake, or brake drag. (2) In the bus exhaust emission control system, the engine control program for DPD (Diesel Particulate Device) regeneration is incorrect. A portion of the DPD regeneration fuel combusts downstream of the DPD, causing exhaust gas temperatures near the urea SCR (Selective Catalytic Reduction) catalyst to reach excessive levels. The radiant heat may melt the urea solution hose and other components, causing urea solution to leak and allowing nitrogen oxide (NOx) emissions to exceed the specified limit.
Corrective action
(1) On all vehicles, replace the affected piston with a conforming replacement part. (2) On all vehicles, reprogram the engine control program with the corrected/updated software. Additionally, add thermal insulation to the urea solution hose and replace the differential pressure hose and clips with corrected parts. Inspect the urea solution hose; if melting damage is found, repair or replace it with a new part.
Affected models & chassis ranges
This filing lists 27 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 |
|---|---|---|
| 2DG-LV290N2 | ERGA | LV290N2-7000002 — LV290N2-7001176 |
| 2DG-LV290N3 | ERGA | LV290N3-7000113 — LV290N3-7000308 |
| 2DG-LV290Q2 | ERGA | LV290Q2-7000307 |
| 2KG-LR290J3 | ERGA | LR290J3-7000004 — LR290J3-7000578 |
| 2KG-LR290J4 | ERGA | LR290J4-7000003 — LR290J4-7000234 |
| 2KG-LV290N2 | ERGA | LV290N2-7000004 — LV290N2-7001168 |
| 2KG-LV290N3 | ERGA | LV290N3-7000100 — LV290N3-7000307 |
| 2KG-LV290Q2 | ERGA | LV290Q2-7000087 — LV290Q2-7000245 |
| 2KG-LV290Q3 | ERGA | LV290Q3-7000038 — LV290Q3-7000078 |
| 2PG-LV290N2 | ERGA | LV290N2-7000083 — LV290N2-7001159 |
| 2PG-LV290N3 | ERGA | LV290N3-7000002 — LV290N3-7000306 |
| 2PG-LV290Q2 | ERGA | LV290Q2-7000006 — LV290Q2-7000323 |
| 2PG-LV290Q3 | ERGA | LV290Q3-7000002 — LV290Q3-7000079 |
| 2SG-HL2ANBD | ERGA | HL2ANB-60011 — HL2ANB-60021 |
| 2SG-HL2ASBD | ERGA | HL2ASB-60011 — HL2ASB-60017 |
| 2TG-LV290N2 | ERGA | LV290N2-7000316 |
| 2TG-LV290N3 | ERGA | LV290N3-7000151 — LV290N3-7000221 |
| 2TG-LV290Q2 | ERGA | LV290Q2-7000035 — LV290Q2-7000322 |
| 2TG-LV290Q3 | ERGA | LV290Q3-7000003 — LV290Q3-7000080 |
| QDG-LV290N1 | ERGA | LV290N1-7000007 — LV290N1-7001056 |
| QDG-LV290Q1 | ERGA | LV290Q1-7000258 |
| QKG-LV290N1 | ERGA | LV290N1-7000008 — LV290N1-7001035 |
| QKG-LV290Q1 | ERGA | LV290Q1-7000174 — LV290Q1-7000261 |
| QPG-LV290N1 | ERGA | LV290N1-7000206 — LV290N1-7000850 |
| QPG-LV290Q1 | ERGA | LV290Q1-7000005 — LV290Q1-7000276 |
| QRG-LV290Q1 | ERGA | LV290Q1-7000003 — LV290Q1-7000268 |
| SKG-LR290J2 | ERGA | LR290J2-7000049 — LR290J2-7000316 |
Original Japanese (MLIT source text)
Show the original Japanese filing text
状況
（１）バスの制動装置において、駐車ブレーキ用リレーバルブ内部の樹脂ピストンの材質が不適切なため、エア回路中の水分により加水分解して、ブレーキエア圧により当該ピストンが破損することがある。そのため、ブレーキバルブからのエア漏れや、駐車ブレーキの解除不能、ブレーキ引きずりが発生するおそれがある。（２）バスの排出ガス発散防止装置において、ＤＰＤ（粒子状物質除去装置）再生時のエンジン制御プログラムが不適切なため、ＤＰＤ再生用燃料の一部がＤＰＤの下流で燃焼し、尿素ＳＣＲ（選択還元型触媒）付近の排出ガス温度が高温となることがある。そのため、その放射熱により尿素水ホース等が溶損して尿素水が漏れ、排出ガス中の窒素酸化物（ＮＯｘ）の排出値が基準値を超えるおそれがある。
改善措置
（１）全車両、当該ピストンを良品に交換する。（２）全車両、エンジン制御プログラムを対策プログラムに書き換える。また、尿素水ホースに断熱材を追加し、差圧ホース、クリップを対策品に交換する。なお、尿素水ホースを点検し、溶損している場合は修復または新品に交換する。
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=3004820
Related recalls
Same manufacturer, same component
Other Isuzu filings involving the Exhaust Emission Reduction Device, closest to this one by filing date.
Exhaust Emission Reduction Device — affects 9,893 vehicles.
Open recall detail →Exhaust Emission Reduction Device — affects 81 vehicles.
Open recall detail →Exhaust Emission Reduction Device — affects 13,609 vehicles.
Open recall detail →Exhaust Emission Reduction Device — affects 21,136 vehicles.
Open recall detail →Exhaust Emission Reduction Device — affects 2,716 vehicles.
Open recall detail →Other recalls affecting the same models
Filings whose affected type codes overlap with this one, newest first.
Rearview mirror — affects 2,566 vehicles.
Open recall detail →Rearview Mirror — affects 1,867 vehicles.
Open recall detail →Engine Control Computer — affects 339 vehicles.
Open recall detail →Engine Control Computer — affects 36 vehicles.
Open recall detail →Exhaust Gas Reduction Device — affects 7,494 vehicles.
Open recall detail →