CAP AS-FUEL 3709009 - Caterpillar

TECHNICAL INFORMATION BULLETIN February 11, 2003
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)
Component Code: 1907SUBJECT: 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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