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  #1  
Old 01-20-2009, 08:34 AM
 
Join Date: Aug 2007
Posts: 5
Default TRANSMISSION SUDDEN DOWNSHIFT

I HAVE A NEW PROBLEM, SAME CAR 2001 XG300, WHILE DRIVING IT THIS WEEKEND I WAS IN A BEACH TOWN DRIVING BETWEEN TRAFFIC LIGHTS APPROX 40 MPH, ALL OF A SUDDEN THE CAR JOLTED AND THE CHECK ENGINE LIGHT CAME ON AND THE CAR WAS STUCK IN 3RD GEAR, I TRIED TO GET IT TO CHANGE TO 4TH MANUALLY BUT ALL IT WOULD DO IS MANUALLY SHIFT BETWEEN 3RD AND 2ND AND ONLY IF I USED THE SPORT SHIFT MODE. IF I STOPPED AT A TRAFFIC LIGHT IT WOULD START OUT IN 3RD AND STAY THERE. I FINALLY DROVE BACK TO THE HOTEL AND TURNED THE ENGINE OFF AND RESTARTED AND THEN THE TRANSMISSION SHIFTED NORMALLY BUT THE CHECK ENGINE LIGHT REMAINS, ONE THING I HAVENOTICED IS THAT WHEN THE CAR SHIFTS FROM I THINK 3RD TO 4TH IT KIND OF SHUDDERS, ITALWAYS DID BUT IT SEEMS WORSE NOW WITH AGE. ANY SUGGESTIONS?
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  #2  
Old 01-20-2009, 08:54 AM
Banned
 
Join Date: Sep 2008
Posts: 1,254
Default Re: Transmission sudden downshift

The first thing to do is go to Autozone and do a free trouble code scan to verify the problem, write down the code, erase the code. Then check back here and give us the code.

The likely problem is that the adaptive learning of the computer has become fouled.

There is a TSB. The fix is to make sure it's full of the proper trans fluid and reset the adaptive control computer using a scan tool. It's supposed to be covered under warranty:

Page 1 of 8
Technical Service
Bulletin
Subject
Group
Number
Date
Model
AUTOMATIC TRANSAXLE
08-AT-003
MAY, 2008
1999~ SONATA, 2001~06 ELANTRA,
2001~ SANTA FE & XG, 2003~
TIBURON, 2005~ TUCSON, 2006~
AZERA, 2007~ ENTOURAGE
AUTOMATIC TRANSAXLE HARSH AND/OR DELAYED
UPSHIFT OR DOWNSHIFT - GDS ANALYSIS
This TSB supersedes TSB 07-40-010 to correct the labor time for OP Code
95440RP0 and 95440PQ0.
DESCRIPTION:
If you are diagnosing an automatic transaxle with a harsh and/or delayed upshift or
downshift, follow the Diagnostic Procedure shown below.
DIAGNOSTIC PROCEDURE:
1. Check the ATF level when the engine is idling in ???N??? according to TSB 06-40-016.
Adjust the ATF level as needed.
2. Reset and relearn the adaptive values according to TSB 06-40-005.
3. Compare to a similar model and year vehicle. If the shift delay is longer than the
comparison vehicle, continue with the diagnosis.
4. Attach the GDS and check for Diagnostic Trouble Codes in both the ???Engine??? and
???Automatic Transaxle??? menu. If DTC are found, repair according to the appropriate
TSB or shop manual.
NOTE: Ask an assistant to drive the vehicle as you monitor the GDS.
Attach the GDS and select the following:
??? VIN and ???A/T???
??? ???Current Data???
??? ???Shift position???
??? ???Vehicle speed???
??? ???Low-Reverse solenoid duty???
??? ???Underdrive solenoid duty???
??? ???OD solenoid duty???
??? ???2nd solenoid duty???
??? ???Reduction solenoid duty??? (if 5-speed transaxle)
??? Accelerate the vehicle and shift from 1-2-3-4-(5 if equipped).
??? Select ???Record??? (on top right of screen)
Page 2 of 8
??? Select ???PC Record??? (on left of screen) and save the file.
UPSHIFT COMMANDS FROM PCM OR TCM:
Open the GDS program and select:
??? VIN and ???A/T???
??? ???Flight Record??? and ???Data Review???
??? ???Items List??? (top right of screen) and select: ???Vehicle speed??? and ???Shift position???.
PCM/TCM DIAGNOSIS:
Confirm the PCM or TCM commanded each gear: 1, 2, 3, 4 and 5 (if equipped):
??? If so, go to pages 3~6 and evaluate the upshift diagnosis for the related shift.
??? If not, exchange a PCM or TCM from a properly operating vehicle and test again
to determine if the PCM or TCM commanded each gear:
??? If the condition is improved, replace the PCM or TCM
Page 3 of 8
Technical Service
Bulletin
Group
Number
??? If the condition is not improved, go to page 3~6 and evaluate the upshift
performance.
1-2 UPSHIFT DIAGNOSIS:
Open the GDS program and select: VIN and ???A/T???, ???Flight Record??? and ???Data Review???
??? Select ???Items List??? (top right of screen) and select: ???2nd Solenoid Duty???,
???Underdrive Solenoid Duty??? and ???Shift Position???.
??? Click the ???+??? or ???-??? buttons to choose 0.7 sec./Div or less.
??? Move the cursor to the start of the shift and ???Left click???.
??? Move the cursor to the end of the shift and ???Right click???.
??? Read the 2nd solenoid elapsed time at the top right of the screen. If the 1-2 shift
requires more than 2.0 seconds, exchange a PCM or TCM from a properly
operating vehicle and follow TSB 06-40-005, ???Reset and Relearn Adaptive
Values???:
??? If the condition is improved, replace the PCM or TCM
??? If the condition is not improved, replace the transaxle.
08-AT-003
TRANSAXLE
Page 4 of 8
NOTE: The 2nd solenoid elapsed time is important; the shape of the graph is not.
2-3 UPSHIFT DIAGNOSIS:
Open the GDS program and select: VIN and ???A/T???, ???Flight Record??? and ???Data Review???
??? Select ???Items List??? (top right of screen) and select: ???Underdrive Solenoid Duty???,
???Overdrive Solenoid Duty??? and ???Shift Position???.
??? Select the ???+??? or ???-??? button to choose 0.7 sec./Div or less.
??? Move the cursor to the start of the shift and ???Left click???.
??? Move the cursor to the end of the shift and ???Right click???.
??? Read the OD solenoid elapsed time at the top right of the screen. If the 2-3 shift
requires more than 2.0 seconds, exchange a PCM or TCM from a properly
operating vehicle and follow TSB 06-40-005, ???Reset and Relearn Adaptive
Values???:
??? If the condition is improved, replace the PCM or TCM
??? If the condition is not improved, replace the transaxle.
NOTE: The OD solenoid elapsed time is important; the shape of the graph is not.
Page 5 of 8
Technical Service
Bulletin
Group
Number
3-4 UPSHIFT DIAGNOSIS:
Open the GDS program and select: VIN and ???A/T???, ???Flight Record??? and ???Data Review???
??? Select ???Items List??? (top right of screen) and select: ???2nd Solenoid Duty???,
???Overdrive Solenoid Duty??? and ???Shift Position???.
??? Select the ???+??? or ???-??? button to choose 0.7 sec./Div or less.
??? Move the cursor to the start of the shift and ???Left click???.
??? Move the cursor to the end of the shift and ???Right click???.
??? Read the 2nd solenoid elapsed time at the top right of the screen. If the 3-4 shift
requires more than 2.0 seconds, exchange a PCM or TCM from a properly
operating vehicle and follow TSB 06-40-005, ???Reset and Relearn Adaptive
Values???:
??? If the condition is improved, replace the PCM or TCM
??? If the condition is not improved, replace the transaxle.
08-AT-003
TRANSAXLE
Page 6 of 8
NOTE: The 2nd solenoid elapsed time is important; the shape is not.
4-5 UPSHIFT DIAGNOSIS:
Open the GDS program and select: VIN and ???A/T???, ???Flight Record??? and ???Data Review???
??? Select ???Items List??? (top right of screen) and select: ???Reduction Solenoid Duty???,
Low-Reverse Solenoid Duty and ???Shift Position???.
??? Select the ???+??? or ???-??? button to choose 0.7 sec./Div or less.
??? Move the cursor to the start of the shift and ???Left click???.
??? Move the cursor to the end of the shift and ???Right click???.
??? Read the LR solenoid elapsed time at the top right of the screen. If the 4-5 shift
requires more than 2.0 seconds, exchange a PCM or TCM from a properly
operating vehicle and follow TSB 06-40-005, ???Reset and Relearn Adaptive
Values???:
??? If the condition is improved, replace the PCM or TCM
??? If the condition is not improved, replace the transaxle.
Page 7 of 8
Technical Service
Bulletin
Group
Number
NOTE: The LR solenoid elapsed time is important; the shape of the graph is not.
08-AT-003
TRANSAXLE
Page 8 of 8
WARRANTY INFORMATION:
NOTE: Warranty Claim requires input of DTC codes on all claims using Hi-Scan
or GDS operations. If no DTC code is identified by the Hi-scan or GDS,
enter P0000 as a Scan Tool Test Code on the Warranty Claim and attach
printout from the Hi-scan or GDS to the Repair Order.
NOTE: Printouts must be attached to all Repair Orders. Repair Orders without
attached printouts are subject to chargeback.
MODEL PCM/
TCM OP CODE OPERATION
OP
TIME
CAUSAL
P/N
OP
QTY
NATURE
CODE
CAUSE
CODE
2006~ Azera
2001~06 Elantra XD
2007~ Elantra HD
2007~ Entourage EPV-V6
2001~06 Santa Fe SM
2007~ Santa Fe CM, CMV
1999~05 Sonata EF
2006~ Sonata NF, NFV-V6
2005~ Tiburon GK
2005~ Tucson JM
2001~05 XG
PCM
39110RP0 Hi-Scan
Operation 0.3
See
parts
catalog
1 N26 C15
39110RQ0 GDS
Operation 0.3
MODEL PCM/
TCM OP CODE OPERATION
OP
TIME
CAUSAL
P/N
OP
QTY
NATURE
CODE
CAUSE
CODE
2001~06 Elantra XD
2001~06 Santa Fe CMV-V6
1999~05 Sonata EFV-V6
2003~ Tiburon GK, GKV
2005~ Tucson JMV-V6
TCM
95440RP0 Hi-Scan
Operation 0.4 See
parts
catalog
1 N26 C15
95440RQ0 GDS
Operation 0.3

Page 1 of 4
Technical Service
Bulletin
Subject
Group
Number
Date
Model
TRANSAXLE
06-40-005
MARCH, 2006
ALL
AUTOMATIC TRANSAXLE CONTROL MODULE -
RESET AND RELEARN ADAPTIVE VALUES
This bulletin supersedes TSB 05-40-004 to include additional models.
DESCRIPTION:
The PCM or TCM contains logic to adjust solenoid duty and line pressure as needed to
compensate for normal clutch wear over the life of the transaxle. This bulletin provides
the procedures necessary to reset (erase) and ???relearn??? the adaptive values in the
PCM/TCM.
After the following repairs have been completed, the PCM/TCM adaptive values must
be reset in order to provide optimum shift quality:
??? Replace automatic transaxle
??? Reprogram or swap PCM/TCM from another vehicle
Adaptive values must be reset using procedure #1 or #2 according to model and model
year (MY) as shown below.
I. RESET PCM/TCM ADAPTIVE VALUES
MODEL ENGINE
1.
DISCONNECT NEGATIVE
BATTERY CABLE FOR 10
SECONDS
2.
USE HI-SCAN OR GDS,
TURN IGNITION KEY OFF
FOR 10 SECONDS
ACCENT 1.6L 1996~2005 MY 2006 MY~
ELANTRA 2.0L ~12/01/2002 12/01/2002~
TIBURON
2.0L 1997~2004 MY 2005 MY~
2.7L 1997~2004 MY 2005 MY~
SANTA FE
2.4L 2001~04 MY 2005 MY~
2.7L 2001~04 MY 2005 MY~
3.5L 2003~04 MY 2005 MY~
XG300 3.0L 2001 MY N/A
XG350 3.5L 2002~04 MY 2005 MY~
TUCSON
2.7L N/A 2005 MY~
2.0L N/A 2005 MY~
Page 2 of 4
HI-SCAN PROCEDURE:
1. Turn the Ignition key to the ???ON??? position (do not start engine) and move the shift
lever to ???P???.
2. Attach the Hi-Scan Pro to the data link
connector (DLC):
??? Select vehicle
??? Select ???AUTOMATIC TRANSAXLE???
menu.
??? Select ???RESETTING ADAPTIVE
VALUES???, press ???ENTER???
??? Press ???ENTER???, then ???REST??? (F1)
??? Turn Ignition key ???OFF??? for 10
seconds.
1999~2005
Sonata
2.4L 1999~2004 MY 2005 MY~
2.7L 1999~2004 MY 2005 MY~
2006~
SONATA
2.4L N/A 2006 MY~
3.3L N/A 2006 MY~
AZERA 3.8L N/A 2006 MY~
ENTOURAGE 3.8L N/A 2006 MY~
MODEL ENGINE
1.
DISCONNECT NEGATIVE
BATTERY CABLE FOR 10
SECONDS
2.
USE HI-SCAN OR GDS,
TURN IGNITION KEY OFF
FOR 10 SECONDS
Page 3 of 4
Technical Service
Bulletin
Group
Number
II. RELEARN ADAPTIVE VALUES:
NOTE: After the adaptive values have been reset (erased), an ???adaptive learning???
procedure must be completed as shown below.
3. Attach a Hi-Scan Pro or GDS and
select ???Engine??? menu, ???Current Data???
menu and throttle position sensor in
volts (???THROTTLE POS. SENSOR???,
???ACCEL. POS. S???, or ???ACCEL PEDAL
1 VOLT???, depending on model).
4. Drive the vehicle until the ATF
temperature is within the temperature
range shown on Page 3.
5. Request an assistant to monitor the Hi-
Scan while accelerating the vehicle at
small throttle openings (approximately 25-
30% throttle). Hold the accelerator pedal
steady at a throttle position sensor value
of 1.45~1.75v during several 1-2-3-4
upshifts. Repeat until normal gear
transitions occur.
6. Repeat this procedure for 4-3, 3-2 and 2-1
downshifts.
TPS Specification: 1.45~1.75v
TRANSAXLE
06-40-005
Page 4 of 4
NOTE: Adaptive learning does not occur below the ATF temperature range
shown below:
WARRANTY INFORMATION:
Applicable warranty coverage applies
ATF TEMPERATURE: 122~194??F
(50~90??C) Y~
AZERA 3.8L N/A 2006 MY~
ENTOURAGE 3.8L N/A 2006 MY~

Last edited by NovaResource; 09-20-2011 at 06:48 PM.
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Old 01-20-2009, 08:54 AM
 
 
 
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