| 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.
