Engine Controls - Driveline Bump On Low Speed Braking
TSB 08-18-709/15/08
DRIVELINE BUMP WHILE BRAKING-BELOW 10 MPH
(16 KM/H)-BUILT ON OR BEFORE 4/17/2008
LINCOLN:
2007-2008 Navigator
This article supersedes TSB 08-16-8 to update the Service Procedure.
ISSUE
Some 2007-2008 Navigator vehicles built on or before 4/17/2008 may exhibit a bump feeling while braking to a stop below 10 MPH (16 Km/h). This procedure will improve the bump felt while braking to a stop.
ACTION
Follow the Service Procedure steps to correct the condition
SERVICE PROCEDURE
CAUTION
APPLYING THIS PROCEDURE TO UNITS THAT DO NOT MEET THE BUILD DATE CRITERIA MAY RESULT IN WORSE SHIFT QUALITY.
NOTE
DO NOT ATTEMPT TO REPLACE THE MECHATRONIC UNIT. MECHATRONIC REPAIR/REPLACEMENT IS NOT AUTHORIZED FOR THIS ISSUE.
1. Install IDS/PDS or equivalent and ID vehicle.
2. Update the powertrain control module (PCM)/transmission control module (TCM) calibration using IDS release 56.4 and higher. This new calibration is not included in the VCM 2008.7 DVD. Calibration files may also be obtained at the website. Since the TCM cannot be independently reprogrammed, reprogram using the PMI function to ensure that engine and transmission calibrations are updated to the latest level simultaneously.
a. Verify that the TCM shows 7U74-7J104-AA part number after reprogramming is complete, IDS Mode Level 9 OBD Test Modules TCM/PCM Cal Part Number.
NOTE
DO NOT CLEAR THE PCM KAM.
3. Verify that the transmission fluid temperature (TFT) PID is above 175 °F (80 °C). If it is not at 175 °F (80 °C), drive unit approximately 3 miles (5 Km) to reach temperature.
NOTE
TFT MUST BE AT 175 °F (80 °C) OR ABOVE BEFORE PROCEEDING TO STEP 4.
4. Drive unit to perform adaptive shift strategy learn.
a. Accelerate from rest with light throttle to 15 MPH (24 Km/h), remove foot from accelerator pedal.
b. Brake very gently to a complete stop (allow at least six (6) seconds).
c. Repeat steps (a-b) five (5) times in the dealership parking lot or similar setting.
d. Accelerate from rest with light throttle ensuring that the 1-2, 2-3 and 3-4 shifts occur at engine speeds between 1300-1800 RPM.
e. Continue to accelerate until you achieve 50 MPH (80 Km/h) or the 5-6 upshift.
f. Brake gently to a complete stop and hold foot on brake for ten seconds.
g. Repeat steps (e-f) three (3) times.
NOTE
THE HARSH BUMP FELT WHILE BRAKING TO A STOP WILL BE IMPROVED. HOWEVER, SEVERAL DAYS OF DRIVING ARE REQUIRED FOR THE TRANSMISSION TO FULLY ADAPT.
WARRANTY STATUS: Eligible Under Provisions Of New Vehicle Limited Warranty Coverage
IMPORTANT: Warranty coverage limits/policies are not altered by a TSB. Warranty coverage limits are determined by the identified causal part.
OPERATION DESCRIPTION TIME
081807A 2007-2008 Navigator: 1.1 Hrs.
Check DTCs, Reprogram
The PCM And TCM,
Includes Time To Perform
Road Test. Authorization
Decal Not Required (Do
Not Use With 12650D)
DEALER CODING
CONDITION
BASIC PART NO. CODE
RECAL 04
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