Catera V6-3.0L VIN R (1997)
Control Module: All Technical Service Bulletins
A/T - 4L30E Cold Shift Pattern
File In Section: 07 - Transmission/Transaxle
Bulletin No.: 01-07-30-001
Date: January, 2001
INFORMATION
Subject:
Cold Shift Pattern (Normal Condition)
Models:
1997-2001 Cadillac Catera
with Hydra-matic 4L30-E (RPO ML4)
Some owners of the above vehicles may comment on increased or higher engine speeds when the vehicle is driven immediately from a cold start. The
Transmission Control Module (TCM) software contains a function that modifies shift speed speeds when the engine is cold. When activated, this feature
will delay the shifts 10 to 15 km/h (6 to 9 mph), depending on the throttle angle.
The cold shift pattern enables if all of the following conditions exist:
^
The engine has been running for 5 seconds.
^
The engine temperature is between 40°C and +30°C (-40°F and +86°F).
^
Vehicle speed is 0 km/h (0 mph).
The cold shift pattern is disabled under any of the following conditions:
^
60 seconds after activation.
^
If throttle angle exceeds 60.5 percent.
^
Vehicle speed exceeds 50 km/h (30 mph).
This is a normal condition, no repair should be attempted.
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