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Home >> Lincoln >> 1999 >> Navigator 2WD V8-5.4L SOHC VIN L >> Repair and Diagnosis >> Powertrain Management >> Transmission Control Systems >> Testing and Inspection >> Initial Inspection and Diagnostic Overview >> Shift Point Road Test
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Shift Point Road Test

The following Shift Point Road Test and Torque Converter Clutch Operation Test provide diagnostic information on transmission shift controls and torque converter operation.


SHIFT POINT ROAD TEST

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

This test verifies that the shift control system is operating properly.
1. Bring engine and transmission up to normal operating temperature.
2. Operate the vehicle with the transmission range selector lever in (D).
3. Apples minimum throttle and observe the speeds at which the upshift occurs and the torque converter engages.
4. With the transmission in OVERDRIVE (fourth gear), depress the transmission control switch. The transmission should downshift to third gear. Remove foot from accelerator pedal; engine braking should occur.
5. Press the accelerator pedal to floor (wide-open throttle). The transmission should shift from third to second gear or third to first, depending on vehicle speed. Torque converter clutch should disengage and then reapply.
6. With vehicle in (D) range above 80 km/h (50 mph) and less than half throttle, move the transmission range selector lever from (D) range to MANUAL 2 range and remove foot from the accelerator pedal. The transmission should immediately downshift into second gear. With the vehicle remaining in MANUAL 2 range, move the transmission range selector lever into MANUAL 1 range. Transmission should downshift into first gear at speeds BELOW 48 - 56 km/h (30 - 35 mph).
7. If the transmission fails to upshift/downshift or the torque converter clutch does not apply and release, refer to Diagnosis by Symptom Index under Diagnosis by Symptom for concern diagnosis.Symptom Related Diagnostic Procedures


APPLICATIONS SHIFT SPEEDS-APPROXIMATE





NOTE: This vehicle has been equipped with a special cold weather shift strategy. This was designed to maximize heater performance. This new strategy operates under the following conditions: ambient air temperature at start up is -4°C (25°F) or below and the engine coolant temperature at start up is 38°C (100°F) or below. During this condition the vehicle may experience a slightly delayed shifts under light throttle. Medium and heavy throttle shifts will be normal. Once the engine coolant reaches 71°C (160°F) or above normal shift scheduling will resume. If during the diagnosing of a delayed shift concern and the concern goes away after the engine coolant reaches above 71°C (160°F) this is a normal operation of the special cold weather shift strategy. If this condition does not go away after the engine coolant reaches 71°C (160°F), refer to Diagnosis by Symptom.Symptom Related Diagnostic Procedures

NOTE: Vehicles equipped with an OSS sensor will have new adaptive shift strategies. Whenever the vehicles battery has been disconnected for any type of service or repairs the strategy parameters that are stored in the Keep Alive Memory (KAM) will be lost. The strategy will start to learn once the battery is reconnected and the vehicle is driven. This is a normal condition and will go away once the PCM learns all the parameters from the driving conditions. There is no time frame set to this learning process. If this concern is present during down shifts or converter clutch apply, it is not the shift strategy and will require diagnosis.

The customer needs to be notified that they may experience slightly different upshifts either soft or firm and that this condition is normal and will eventually go away.
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