A/T - Cold Weather Shift Characteristics
2007 Service BulletinsInformation IB07-05-S001
ISSUE DATE: JANUARY 2007
1-2, 2-3, 3-4 Shift and Torque Converter Clutch (TCC) Characteristics during Cold Weather Operation On 4l60-E Transmissions (This Bulletin Supersedes IB05-05-S009
Affected Vehicles
2005-2007 Isuzu Ascender
2007 Isuzu i-290/i-370 (TI) with automatic transmission
2006 Isuzu i-280/i-350 (TI) with automatic transmission
Service Information
This bulletin is being revised to update models and model years.
On cold days, approximately 32°F (0°C) or colder, the transmission is designed to shift differently.
The transmission uses a warm-up mode shift schedule until the engine reaches normal operating temperature. While the transmission is in warm-up mode, it is normal for transmission upshifts to be delayed or held longer. This feature improves heater performance by giving quicker vehicle warmups.
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