Overview
| MLIT filing number | 1140550 |
|---|---|
| Type | Statutory Recall (government-mandated recall) |
| Date filed | June 6, 2017 |
| Manufacturer(s) | Mitsubishi |
| Component | Other (Control System) |
| Production period | July 2014 — December 23, 2016 |
| Vehicles affected | 23 units |
Defect
In the negative-pressure switch that controls the vacuum pump of the brake booster, some units were manufactured without performing secondary vulcanization of the internal silicone rubber. This causes siloxane and other gases to accumulate inside the switch. Arc discharge generated as the movable contact separates from the fixed contact can then deposit highly insulating silicone compounds on the contact surfaces. The resulting increase in contact resistance causes a conductivity failure, and the vacuum pump does not activate even when negative pressure in the vacuum tank drops below the threshold. Brake pedal effort increases and stopping distance is extended. Additionally, when negative pressure in the vacuum tank drops, a warning buzzer sounds; however, the buzzer volume is too low and the driver may not notice the pressure loss.
Corrective action
Replace all negative-pressure switches containing non-secondary-vulcanized silicone rubber with conforming units. On all vehicles, also replace the warning buzzer with the corrected/revised part.
Affected models & chassis ranges
This filing lists 1 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 |
|---|---|---|
| WDR-F20D | Forklift | F20D-00032 — F20D-10129 |
Original Japanese (MLIT source text)
Show the original Japanese filing text
状況
制動倍力装置 のバキュームポンプ の作動を制御する負圧スイッチにおいて，製造時にスイッチ内のシリコンゴムの二次加硫をしていないものがあり，スイッチ内にシロキサン等のガスが発生し，可動接点が固定接点から離れる際のアーク放電により，接点部に絶縁性の高いシリコン化合物が生成されることがある。そのため，接点の抵抗が増え導通不良となり，負圧タンク内の負圧が低下しても，負圧スイッチが作動しないためバキュームポンプが作動せず，ブレーキペダルの操作力が増大し，制動距離が長くなるおそれがある。また，負圧タンク内の負圧が低下した際，警告ブザー が鳴るが，音量が小さいため，運転者が負圧低下に気付かないおそれがある。
改善措置
二次加硫していないシリコンゴムを使用している負圧スイッチを良品に交換する。また，全車両，警告ブザーを対策品に交換する。
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=3004040
Related
All Mitsubishi recalls · All 2017 recalls · Recall Archive home