My 2001 lincoln ls wont go into 4th or 5th gears. Took it to a trans shop and they recommended a rebuild for 3000+ dollars. But Ive been reading that alot of lincolns with the same problem getting error codes 734,735, and 795 could just have a broken prestroke 4-3 valve spring. Is this simpler if not cheaper to fix and where could i go to get it done?
Call your dealer to get an estimate too.
Shift Patterns
Upshifts
Transmission upshifting is controlled by the powertrain control module. The PCM receives inputs from various engine or vehicle sensors and driver demands to control shift scheduling, shift feel and torque converter clutch (TCC) operation.
The PCM has an adaptive learn strategy to electronically control the transmission which will automatically adjust the shift feel. When the battery has been disconnected, or a new battery installed certain transmission operating parameters may be lost. The Powertrain Control Module (PCM) must re-learn these parameters. During this learning process you may experience slightly firm shifts, delayed, or early shifts. This operation is considered normal and will not affect the function of the transmission. Normal operation will return once these parameters are stored by the PCM.
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Apply Components
Band — Overdrive
For component location, refer to Disassembled Views in this section.
During 2nd and 5th gear operation, hydraulic pressure is applied to the overdrive servo.
Band — Low/Reverse
For component location, refer to Disassembled Views in this section.
During 2nd gear operation, 1st gear operation and reverse, hydraulic pressure is applied to the low/reverse servo.
Band — Intermediate
For component location, refer to Disassembled Views in this section.
During 3rd gear operation, hydraulic pressure is applied to the intermediate servo.
Clutches — Direct
For component location, refer to Disassembled Views in this section.
The direct clutch is a multi-disc clutch made up of steel and friction plates.
Clutches — Forward
For component location, refer to Disassembled Views in this section.
The forward clutch is a multi-disc clutch made up of steel and friction plates.
Clutches — Coast
For component location, refer to Disassembled Views in this section.
The coast clutch is a multi-disc clutch made up of steel and friction plates.
Clutches — Intermediate
For component location, refer to Disassembled Views in this section.
The intermediate clutch is a multi-disc stationary clutch made up of steel and friction plates which are in a module assembly that includes the cylinder and frictions.
One-Way Clutch — Direct
For component location, refer to Disassembled Views in this section.
The direct one-way clutch is a sprag-type one-way clutch that is pressed into the center shaft.
One-Way Clutch — Intermediate
For component location, refer to Disassembled Views in this section.
The Intermediate One-Way Clutch is a sprag type one-way clutch.
One-Way Clutch — Low/Reverse
For component location, refer to Disassembled Views in this section.
The low/reverse one-way clutch is a sprag type one-way clutch.
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what codes did you get?
Shift Concern: No 3-4 Shift
222 — ELECTRICAL ROUTINE
Powertrain Control System
· PCM, vehicle wiring harnesses, Shift Solenoid A, Pressure Control Solenoid C, Output Shaft Speed (OSS) sensor, Digital TR sensor
734 = gear 4 incorrect ratio
735 = gear 5 incorrect ratio
795 = pressure control solenoid c
I don't think you need a trans overhaul, just someone to do some pinpoint tests per the shop manual. I would not be surprised if your Lincoln dealer has run into this before and can quickly diagose the cause. Call a couple of dealers and ask them for a guesstimate.
I think you have a short circuit in the PCC solenoid circuit.
Need to run pintpoint test D with the NGS tester that dealer has.
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Incorrect gear selection depending on failure or mode and manual lever position. Shift errors may also be due to other internal transmission concerns (stuck valves, damaged friction material). Engine rpm could be higher or lower than expected.
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P0795, P0797**
PCC
PCC solenoid circuit failure, shorted circuit
Voltage through PCC solenoid is checked. An error will be noted if tolerance is exceeded.
Incorrect gear ratio in fourth and fifth
PINPOINT TEST D: PRESSURE CONTROL (PC) SOLENOIDS (PCA, PCB, PCC)
Check to make sure the transmission harness connector is fully seated, terminals are fully engaged in the connector and in good condition before proceeding.
Install 300 psi pressure gauges into Line and PC C tap.
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i got codes 734, 735, and 795
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