Some 2011-2014 Lincoln Navigator vehicles may exhibit a delayed park-to-forward or park-to-reverse transmission engagement only on initial start-up after parking for several hours or overnight. The vehicle may function normally after the initial engagement has been completed.
Use IDS datalogger to measure the amount of time it takes to reach approximately three MPH at engine idle speed without pressing the accelerator pedal, verifying transmission pump operation.
1. Verify transmission fluid temperature is at 170 degrees Fahrenheit or above.
2. Park the vehicle for at least 6 hours or overnight on a level spot where it can be driven forward uninhibited for up to three MPH.
3. Using IDS, with the ignition on and engine off, select the following parameter identifications (PIDs):
a. VSS vehicle speed
b. TRS Transmission range selector
c. B001 brake on
d. APP% accelerator range selector
e. Gear_Mode transmission gear
f. TFT Transmission fluid temperature
g. TSS_SRC turbine speed sensor
h. RPM engine revolutuons
i. Gear_Rat transmission gear ratio
Read and review the following steps before performing as they need to happen consecutively...make sure the parking brake is released. Do not apply the accelerator pedal for this test.
4. Press the record function and perform the following steps:
a. Press the brake pedal
b. Start the engine
c. Immediately place the transmission selector lever in Drive position
d. Immediately release the brake pedal and allow the vehicle to move at idle speed only. Do not accelerate.
5. After recording for 15 seconds, stop the vehicle.
6. Using the scroll feature, slide the time bar to the point when the brake was released as indicated by B001 and note the time at the bottom.
7. Move the slide until the VSS shows 3 MPH or the maximum speed attained.
8. Did the vehicle reach 3 MPH within 5 seconds? If yes, the vehicle is operating normally. If no, replace the transmission pump assembly. Refer to workshop manual section 307-01.
