TCM ADAPTATION – WA580/NAG1 Only

The adaptation procedure requires the use of the appropriate scan tool. This program allows the electronic
transmission system to re-calibrate itself. This will provide the proper baseline transmission operation.
The adaptation procedure should be performed if any of the following procedures are performed:
1. Transmission Assembly Replacement
2. Transmission Control Module Replacement
3. Clutch Plate and/or Seal Replacement
4. Electro-hydraulic Unit Replacement or Recondition

1. With the scan tool, reset the Transmission adaptive's. Resetting adaptive's will set the adaptive's to factory
settings. For Upshift adaptation, the Transmission temperature must be greater than 60°C (140°F) and less
than 100°C (212°F). Failure to stay within these temperature ranges will void this procedure.

2. Drive the vehicle until the transmission temperature is in the specified range.

3. Perform 4 to 5 coast downs from 5th to 4th gear and then 4th to 3rd gear.

4. From a stop, moderately accelerate the vehicle and obtain all forward gear ranges while keeping the Engine RPM
below 1800 RPM. Repeat this procedure 4 to 5 times.

5. Obtaining 5th gear may be difficult at 1800 RPM. Allow transmission to shift into 5th gear at a higher RPM then
lower the RPM to 1800 and perform manual shifts between 4th and 5th gears using the shift lever.

6. The TCM will store the adaptive's every 10 minutes. After completion of the adaptation procedure make sure the
vehicle stays running for at least 10 minutes.

7. It is possible to manually store the adaptive's under the 10 minute time frame using the scan tool Store Adaptive's
procedure.

Quick Learn Procedure – RFE

Clutch volume index (CVI) represents the volume of fluid needed to stroke the
clutch return spring. The programing of the TCM allows it to constantly monitor
the time it takes to fill the clutch. If the TCM detects a longer or shorter then
normal shift it will try to make the necessary adjustments to the solenoids
through modulating the duty cycle. By doing this the TCM can keep the shift
quality consistent over the life of the vehicle.

L/R Clutch volume is updated when doing a 2-1 or 3-1 manual downshift to
lower gear with the throttle angle below 5°. Transmission temperature must be
above 110°F. the Clutch volume should be between 82-134

2C Clutch volume is updated when doing a 3-2 kickdown shift with the throttle
angle between 24° and 54°. Transmission temperature must be above 110°F. the
Clutch volume should be between 25-64

OD Clutch volume is updated when doing a 2-3 upshift with the throttle angle
below 5° and 54°. Transmission temperature must be above 110°F. the Clutch
volume should be between 25-64

4C Clutch volume is updated when doing a 3-4 upshift with the throttle angle
between 5° and 54°. Transmission temperature must be above 110°F. the Clutch
volume should be between 30-64

UD Clutch volume is updated when doing a 4-3 kickdown shift with the throttle
angle between 20° and 54°. Transmission temperature must be above 110°F. the
Clutch volume should be between 44-92

Concern: The transmission doesn’t shift smoothly. This condition may occur even
after a Quick Learn procedure has been completed. The 45RFE transmission
adapts to its mechanical tolerances by learning the clutch volume indexes (CVI’s)
as well as the duty cycle and other parameters that control shift quality. Performing a Quick Learn will simply reset all transmission adaptive values to factory
preset values and it will exercise the transmission clutches to learn an approximate value for the clutch CVI’s.

Quick Learn should not be used as a remedy for shift quality complaints. Quick
Learn resets more than 70 learn parameters to their preset values and will require
them to be relearned.

Quick Learn should only be used when a transmission has been replaced or overhauled, or when the Transmission Control Module has been replaced or flashed.
Once Quick Learn is performed, an initial drive evaluation should be performed to
determine if the transmission is shifting smoothly.
The first step is to verify that the shifter linkage is adjusted properly and that the
CHECK PRNDL fault (code 28) is not present.

A misadjusted shifter will not set code 28. A misadjusted shifter cable will however
cause poor 2-3 shift quality.
It is critical that the PRNDL code be OD when the shifter is in the OD position
gate. Use a scan tool to confirm that the correct code is present. If the shifter has
a temporary code (T3 or T4) in the OD shifter position, then this is the most likely
cause for consistent poor 2-3 shift quality. If the linkage is out of adjustment,
then adjust the shifter cable.
Perform the portion of the following 45RFE Quick Learn Procedure that will learn
the specific shift characteristic for the shift problem in question.

Quick Learn Procedure (continued)
Procedure to Learn a Smooth 1st Neutral to Drive Shift
Perform this procedure only if the complaint is for a delayed or harsh shift the
first time the transmission is put into gear after the vehicle is allowed to set with
the engine not running for at least 10 minutes. Use the following steps to have the
TCM learn the lst N-1 UD CVI.
NOTE: The transmission oil temperature must be between 80°-110° F
(27°-43°C).

• Start the engine only when the engine and ignition have been off for
at least ten (10) minutes.

• With the vehicle at a stop and the service brake applied, record the
UD CVI while performing a Neutral to Drive shift. During the shift,
the UD CVI will temporarily show a different value which is the lst N-1
UD CVI. The lst N-1 UD CVI account for air entrapment in the UD
clutch that may occur after the engine has been off for a period of
time.

• Repeat until the recorded lst N-1 UD CVI value
stabilizes.
It is important that this procedure be performed when the transmission temperature is between 80°-110° F (27°-43°C). If this procedure takes too long to complete
fully for the allowed transmission oil temperature, the vehicle may be returned to
the customer with an explanation that the shift will improve daily during normal
vehicle usage. The TCM also learns at higher oil temperatures, but these values
(line pressure correction values) are not available for viewing on a scan tool.

Quick Learn Procedure (continued)
Procedure to Learn a Smooth Neutral to Drive Garage Shift
Perform this procedure if the complaint is for a delayed or harsh shift when the
transmission is put into gear after the vehicle has had its first shift. Use the following steps to have the TCM learn the N-1 UD CVI.
NOTE: The transmission oil temperature must be between 80°-110° F
(27°-43°C).

• Start the vehicle engine and shift to drive.

• Move the vehicle forward to a speed of at least 10 MPH and come to a
stop.

• Perform repeated N-1 shifts at a stop while pausing in Neutral for at
least 2-3 seconds and monitor UD CVI volume until the value
stabilizes. The value will change during the N-D shift. This is normal
since the UD value is different for the N-1 shift then the normal value
shown which is used for 4-3 coastdown and kickdowns. Perform re
peated shifts in this temperature range until the UD CVI value
stabilizes and the N-1 shifts become smooth.
Procedure to Learn 1st 2-3 Shift After a Restart or Shift to Reverse
Use the following procedure to have the TCM learn the 1st 2-3 shift OD CVI.
NOTE: The transmission oil temperature must be above 80°F (27°C).

• With the vehicle engine running, select reverse gear for over 2
seconds.
• Shift the transmission to Drive and accelerate the vehicle from a stop
at a steady 15 degree throttle opening and perform a 2-3 shift while
noting the OD CVI. During the shift, a different value will appear on
the screen, which is the lst 2-3 OD CVI.

• Repeat until the lst 2-3 upshift becomes smooth and
the lst 2-3 OD CVI stabilizes.

Quick Learn Procedure (continued)
Procedure to Learn a Smooth 2-3 Shift and 3-4 Upshift
Use the following procedure to have the TCM learn the OD and 4C CVI’s.
NOTE: The transmission oil temperature must be above 110°F (43°C).
• Accelerate the vehicle from a stop at a steady 15 degree throttle opening and perform multiple 1-2, 2-3, and 3-4 upshifts. The 2nd 2-3 shift
following a restart or shift to reverse will be shown during the shift as
a value between the 1st 2-3 OD CVI and the normal OD CVI. Updates
to the normal OD CVI will occur after the 2nd shift into 3rd gear,
following a restart or shift to reverse.

• Repeat until the 2-3 and 3-4 shifts become smooth and the OD
and 4C CVI become stable.
Procedure to Learn a Smooth 4-3 Coastdown & Part Throttle 4-3 Kickdown
Use the following procedure to have the TCM learn the UD shift volume.
NOTE: The transmission oil temperature must be above 110°F (43°C).

• At a vehicle speed between 40 – 60 MPH, perform repeated 4-3 kick
down shifts.

• Repeat until the UD volume becomes somewhat stable and the
shift becomes smooth.
Procedure to learn 1st 2-3 shift after a restart or shift to reverse
Use the following procedure to have the TCM learn the 2C shift volume.
NOTE: The transmission oil temperature must be above 110°F (43°C).

• With a vehicle speed below 30 MPH and the transmission in 3rd gear,
perform multiple 3-2 kickdowns.

• Repeat until the 3-2 kickdowns become smooth and the 2C
CVI becomes stable.

Quick Learn Procedure (continued)
Procedure to Learn a Smooth Manual 2-1 Pulldown Shift as well as a Neutral
to Reverse Shift
Use the following procedure to have the TCM learn the LR volume.
NOTE: The transmission oil temperature must be above 110°F (43°C).

• With the vehicle speed around 25-30 MPH in Manual 2nd, perform
manual pulldowns to Low or lst gear at closed throttle.

• Repeat until the LR CVI become stable and the manual 2-1
becomes smooth
Procedure to Learn a Smooth Neutral to Reverse Shift
Perform the following shifts.
NOTE: The transmission oil temperature must be above 110°F (43°C).

• With the vehicle at a stop, perform Neutral to Reverse shifts until the
shift is smooth. An unlearned Neutral to Reverse shift may be harsh
or exhibit a double bump.
If any of the shifts are still not smooth after the clutch volume stabilizes,
an internal transmission problem may be present.