A/T - CVT, Engine Flare On Deceleration

A/T - CVT, Engine Flare On Deceleration

SI M 24 01 09

Automatic Transmission

January 2009

2002-2006 Mini Cooper (R50) L4-1.6L (W10) Page 342

Technical Service

SUBJECT

R50/R52 CVT; Engine Speed Flaring on Deceleration

MODEL

R50, R52 Cooper with CVT transmission and W10

SITUATION

The customer may complain of engine speed flaring ("engine revs up") during a closed-throttle deceleration from highway speeds. No faults are

stored in the EMS2K/MS5150 (DME) control module.

CAUSE

Unfavorable CVT (Continuously Variable Transmission) gear ratio adaptation

CORRECTION

Clear the CVT long-term gear adaptation values, and perform the complete transmission "adaptation teach-in" procedure, according to the

instructions below.

Important Note:

The unfavorable gear adaptation values may be erased, and the correct values can be relearned, by occasionally driving the vehicle in "Sport" or in

"Manual" (Steptronic) mode.

Please advise the customer that occasional changes in driving mode (Sport or Manual modes, from time to time) would prevent the engine speed

flaring condition from occurring.

PROCEDURE

To clear the CVT long-term gear ratio adaptation:

1. Connect the vehicle to the ISID/GT1, loaded with the latest diagnostic software.

2. Select "Service Functions"; then "Drive" and "CVT gear".

3. From the second column, select "Replacement/adaptation, CVT transmission" and then "Test Plan".

4. Scroll through the next screens and answer "Yes" to the question "Is it necessary to delete adaptation values?" After the CVT gear ratio

adaptations are deleted, perform a complete transmission "teach-in" procedure, as follows:

Clutch adaptation:

1. Press and hold the brake pedal. Start the cold engine.

2. During a cold start warm-up phase (idle speed is slightly increased), shift from P to N for 10 seconds, and then shift to D for 10 seconds. XP will

be displayed in the instrument cluster.

3. Repeat the following sequence 10 times: shift from P to N for 3 seconds, and then shift to D for 3 seconds. XP will be displayed in the instrument

cluster.

4. Repeat the following sequence 10 times: shift from P to N for 3 seconds, and then shift to R for 3 seconds. XP will be displayed in the instrument

cluster.

Gear ratio adaptation:

1. Accelerate the vehicle to a speed of 50 mph. Release the accelerator pedal and allow the vehicle to coast down to a stop. The transmission adapts

itself when going through 4,500 rpm, 4,000 rpm...and 1,400 rpm engine speeds. P will be displayed now in the instrument cluster.

2. With the engine at the operating temperature (idle speed stabilized at 800 rpm), repeat Clutch Adaptation steps 3 and 4.

3. Turn the ignition off.

2002-2006 Mini Cooper (R50) L4-1.6L (W10) Page 343