Forums
Forum Tools
|
 |
00:37:11 - 11/28/2024
V8 Dakotas
| From | Message |
Mike B
Dodge Dakota
JOIN HERE
10/30/2023
03:08:52
|
 Subject: 46RE STANDARD PROCEDURE - DRIVE LEARN PG
IP: Logged
Message:
46RE STANDARD PROCEDURE - DRIVE LEARN PG 402-404
from FSM
I was looking for the TCM QUICK LEARN STANDARD
PROCEDURE and only found info saying the
transmission had to go to the dealer for this
procedure so I downloaded the FSM for my 2003
Dakota and after looking through the 2895 page
manual, I found a Drive Learn Procedure. Here it
is in its entirety from pages 402 thru 404 and it
is very specific... I'm going to perform this
procedure tomorrow and report back with the
results.
I hope this helps someone out.
STANDARD PROCEDURE - DRIVE LEARN
When a transmission is repaired and a Quick Learn
procedure has been performed on the Transmission
Control Module (TCM), the following Drive Learn
procedure can be performed to fine tune any shifts
which are particularly objectionable.
NOTE: It is not necessary to perform the complete
Drive Learn procedure every time the TCM is Quick
Learned. Perform only the portions which target
the objectionable shift.
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
1st N-D UD CVI.
NOTE: The transmission oil temperature must be
between 80 - 110°F (27 - 43°C).
(1) Start the engine only when the engine and
ignition have been off for at least ten (10)
minutes.
(2) With the vehicle at a stop and the service
brake applied, record the 1st N-D UD CVI while
per- forming a Neutral to Drive shift. The 1st N-D
UD CVI accounts for air entrapment in the UD
clutch that may occur after the engine has been
off for a period of time.
(3) Repeat Step 1 and Step 2 until the recorded
1st N-D UD CVI value stabilizes. NOTE: 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 the DRB III.
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
Norm N-D UD CVI.
NOTE: The transmission oil temperature must be
between 80 - 110°F (27 - 43°C) to learn the UD
CVI.
Additional learning occurs at temperatures as low
as 0°F and as high as 200°F. This procedure may be
performed at any temperature that experiences poor
shift quality.
Although the UD CVI may not change, shift quality
should improve.
(1) Start the vehicle engine and shift to drive.
(2) Move the vehicle forward to a speed of at
least 16 km/h (10 MPH) and come to a stop. This
ensures no air is present in the UD hydraulic
circuit.
(3) Perform repeated N-D shifts at a stop while
pausing in Neutral for at least 2-3 seconds and
monitor Norm N-D 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-D shift then the normal value shown which is
used for 4-3 coastdown and kickdowns. Perform
repeated shifts in this temperature range until
the Norm N-D UD CVI value stabilizes and the N-D
shifts become smooth.
LEARN THE 1ST 2-3 SHIFT AFTER A RESTART OR SHIFT
TO REVERSE
NOTE: The transmission oil temperature must be
above 80°F (27°C).
Use the following steps to have the TCM learn the
1st 2-3 shift OD CVI.
(1) With the vehicle engine running, select
reverse gear for over 2 seconds.
(2) 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 1st 2-3 OD CVI.
(3) Repeat Step 1 and Step 2 until the 1st 2-3
upshift becomes smooth and the 1st 2-3 OD CVI
stabilizes.
LEARN A SMOOTH 2-3 AND 3-4 UPSHIFT
NOTE: The transmission oil temperature must be
above 110°F (43°C).
Use the following steps to have the TCM learn the
OD and 4C CVI’s.
(1) 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.
(2) Repeat Step 1 until the 2-3 and 3-4 shifts
become smooth and the OD and 4C CVI become stable.
LEARN A SMOOTH 4-3 COASTDOWN AND PART THROTTLE 4-3
KICKDOWN
NOTE: The transmission oil temperature must be
above 110°F (43°C).
Use the following steps to have the TCM learn the
UD shift volume.
(1) At a vehicle speed between 64-97 km/h (40-60
MPH), perform repeated 4-3 kickdown shifts.
(2) Repeat Step 1 until the UD volume becomes
somewhat stable and the shift becomes smooth.
LEARN A SMOOTH 1-2 UPSHIFT AND 3-2 KICKDOWN
NOTE: The transmission oil temperature must be
above 110°F (43°C).
Use the following steps to have the TCM learn the
2C shift volume.
(1) With a vehicle speed below 48 km/h (30 MPH)
and the transmission in 3rd gear, perform multiple
3-2 kickdowns.
(2) Repeat Step 1 until the 3-2 kickdowns become
smooth and the 2C CVI becomes stable.
LEARN A SMOOTH MANUAL 2-1 PULLDOWN SHIFT AS WELL
AS A NEUTRAL TO REVERSE SHIFT
NOTE: The transmission oil temperature must be
above 110°F (43°C).
Use the following steps to have the TCM learn the
LR volume.
(1) With the vehicle speed around 40-48 km/h (25-
30 MPH) in Manual 2nd, perform manual pull- downs
to Low or 1st gear at closed throttle.
(2) Repeat Step 1 until the LR CVI becomes stable
and the manual 2-1 becomes smooth.
LEARN A SMOOTH NEUTRAL TO REVERSE SHIFT
NOTE: The transmission oil temperature must be
above 110°F (43°C).
(1) 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.
(2) If any of the shifts are still not smooth
after the clutch volume stabilizes, an internal
transmission problem may be present.
LEARN A SMOOTH 4-5 UPSHIFT
NOTE: The transmission oil temperature must be
above 110°F (43°C).
Use the following steps to have the TCM learn the
Alt 2C CVI.
(1) Accelerate the vehicle through 88 km/h (55mph)
at a steady 10-15 degree throttle opening and
perform multiple 4-5 upshifts.
(2) Repeat Step 1 until the 4-5 shift become
smooth and theAlt 2C CVI become stable. There is a
separate 2C volume used and learned for 4-5
shifts, 2CA. It is independent of the 2C CVI
learned on 3-2 kickdowns.
|
| | P 1 |
|
Post a reply to this message:
Username Registration: Optional
All visitors are allowed to post messages
|
|
