Lincoln Navigator: Automatic Transmission - 10-Speed Automatic Transmission – 10R80 / Road Testing Vehicle. Diagnosis and Testing

Shift Point Road Test

NOTE: Always drive the vehicle in a safe manner according to driving conditions and obey all traffic laws.

Upshift Gear Sequence

At times the 10-speed transmission may skip gears when the vehicle starts from a complete stop. This is normal and desired behavior.

At part pedal when acceleration is brisk, single step upshifts would result in very frequent shift events (very short time in each gear). Double step upshifts result in a longer time spent in each gear.

However, at light pedal and at heavy pedal, single step upshifts will occur. At light pedal, the small 10-speed gear steps allow the engine speed to drop to lower values than it would in the 6-speed transmission, providing for the best fuel economy. In contrast, at heavy or max pedal, the small 10-speed gear steps keep the engine closer to the horsepower peak for best performance.

Downshift Gear Sequence

At times the 10-speed transmission may skip gears when the vehicle down shifts to a complete stop. This is normal and desired behavior.

The same skip shift strategy that is used for the up shift may be applied during down shift.

Road Test

Most performance based automatic transmission diagnostic trouble codes (DTCs) require the fault to be detected multiple times before setting a DTC . In many instances the fault must be detected consecutively a predetermined number of times (up to five). Carrying out the shift point road test as detailed below increases the likelihood that a DTC will set if a fault is present in the system.

1. Bring the engine and transmission up to normal operating temperature.
   

1. Operate the vehicle with the selector lever in the D position.
   

1. From a stop, accelerate the vehicle to 100 km/h (62 mph) with the shifts occurring at approximately 2000 rpm. Stay in 10th gear for 30 seconds or until the TCC applies. Repeat this two times.
   

1. From a stop, accelerate the vehicle to 100 km/h (62 mph) with the shifts occurring at approximately 3000 rpm. Stay in 10th gear for 30 seconds or until the TCC applies. Repeat this two times.
   

1. If the transmission fails to upshift/downshift,
   REFER to: Diagnosis By Symptom (307-01 Automatic Transmission - 10-Speed Automatic Transmission – 10R80, Diagnosis and Testing).

  Shift Speed Chart