Cold Shift Pattern (Normal Condition) (01-07-30-001)
Publication date: 2001-01-16Reference number: 01-07-30-001
Cold Shift Pattern (Normal Condition)
TECHNICAL SERVICE BULLETIN
Reference Number(s): 01-07-30-001, Date of Issue:
January 16, 2001
| Affected Model(s): | 1997-2001 Cadillac Catera; with Hydra-matic 4L30-E (RPO ML4) |
SERVICE INFORMATION
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.