Usage:
CONFIDENTIAL TIBU4173-00
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TECHNICAL INFORMATION BULLETIN |
February 11, 2003 |
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Engines Excavator Wheel Tractor Scraper Wheel Loader Articulated Dump Truck
Track Type Tractor |
3456 (3LW, BGA, CBX, GHI) 385B (ANS, BKX) 621G (ALP) 623G (ARW) 988G (2TW) AD55 (ANW) D350E II (2XW) D400E II (8PS, APF) D8R (6YZ) |
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Component Code: 1907 |
SUBJECT: Failed Sensors May Cause Hard Starting and Misfiring in 3406E and 3456 Engines
PROBLEM:
On the 3406E and 3456 Engines, fretting (due to vibration) may cause the 142-8394 Speed Sensor Group and the 142-8393 Speed Sensor Group to fail. When the 142-8394 Speed Sensor Group and the 142-8393 Speed Sensor Group fail, the 3406E and the 3456 Engines may experience hard starting, misfiring, and rough running. Failure of the 142-8394 Speed Sensor Group and the 142-8393 Speed Sensor Group will cause the following fault codes to become logged or active:
- 190-02
- 190-08
- 342-02
SOLUTION:
Two new potted-pigtail designed sensors have been designed to replace the 142-8394 Speed Sensor Group and the 142-8393 Speed Sensor Group. The 201-6617 Speed Sensor Group replaces the 142-8394 Speed Sensor Group. The 201-6615 Speed Sensor Group replaces the 142-8393 Speed Sensor Group. These new sensors will eliminate fretting attributed to vibration.
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