1st Gear Above 5 km/h (3 mph)
WARNING: This page is about a different car, the 2008 Mercury Sable, 2008 Ford Taurus X, and 2008 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
The transaxle operates differently in 1st gear above and below 5 km/h (3 mph). For transaxle operation below 5 km/h (3 mph), refer to Manual LOW Position and 1st Gear Below 5 km/h (3 mph) .
Mechanical Operation - Apply components:
- Forward (1, 2, 3, 4) clutch
- Low one-way clutch
Planetary Gearset Operation - Front planetary gearset driven components:
- Ring gear
- Planetary carrier
Center planetary gearset driven components:
- Sun gear
- Planetary carrier
Rear planetary gearset driven components:
- None
Front planetary gearset held components:
- Sun gear
Center planetary gearset held components:
- Ring gear
Rear planetary gearset held components:
- Rear planetary carrier (does not contribute to power flow)
1ST GEAR ABOVE 5 KM/H (3 MPH) CLUTCH APPLICATION CHART
| Gear | Direct (3, 5, R) | Overdrive (4, 5, 6) | Forward (1, 2, 3, 4) | Low/ Reverse (L, R) | Intermediate (2, 6) | One-Way |
|---|---|---|---|---|---|---|
| 1st gear | X | X |
For component information, refer to Mechanical Components and Functions .
Hydraulic Operation - Line pressure hydraulic circuits:
- Line pressure from the pump is supplied to the manual valve.
- Line pressure is regulated by the pressure regulator valve.
- The pressure regulator valve is controlled by varying pressure from the LPC solenoid through the LPC circuit.
Torque converter circuits:
- Regulated line pressure from the pressure regulator valve is directed to the TCC control valve through the CONV FD hydraulic circuit.
- When the TCC is released, CONV FD pressure is directed to the TCC RELEASE circuit by the TCC control valve. Pressure from the TCC RELEASE circuit releases the TCC.
- Transmission fluid from the TCC RELEASE returns to the TCC control valve through the TCC APPLY circuit.
Cooler and lubrication hydraulic circuits:
- The TCC control valve directs transmission fluid from the TCC APPLY circuit (return circuit from the torque converter when the TCC is released) to the COOLER FEED circuit.
- In the COOLER FEED circuit, transmission fluid flows through the transmission fluid cooler or the thermal bypass valve to the LUBE circuit.
Solenoid hydraulic circuits:
- The LPC solenoid applies varying pressure to the pressure control valve through theLPC hydraulic circuit. The LPC solenoid regulates line pressure by controlling the position of the pressure regulator valve.
- SSA applies pressure to the forward (1, 2, 3, 4) clutch regulator valve to apply the forward clutch.
Clutch hydraulic circuits:
- Line pressure from the manual valve is directed to the multiplex shift valve through the DRIVE 1 hydraulic circuit.
- The multiplex shift valve directs DRIVE 1 pressure to the forward (1, 2, 3, 4) clutch regulator valve through the DRIVE 2, CB26FD/CB1234FD and CB1234 SUP hydraulic circuits.
- The low/reverse/overdrive (4, 5, 6) clutch regulator valve directs DRIVE 2 pressure to the multiplex shift valve through the VALVE LATCH hydraulic circuit to latch the multiplex shift valve.
- Regulated CB1234 SUP pressure from the forward (1, 2, 3, 4) clutch regulator valve is directed to the forward (1, 2, 3, 4) clutch through the CB1234 hydraulic circuit to apply the clutch.
For additional hydraulic circuit and information, refer to Hydraulic Circuits .
Electrical Operation - Solenoid operation:
1ST GEAR ABOVE 5 KM/H (3 MPH) SOLENOID OPERATION CHART
| Base Selector Lever Position | PCM Commanded Gear | Shift Solenoid | TCC (VFS) NL | ||||
|---|---|---|---|---|---|---|---|
| SSA (VFS) NL (1, 2, 3, 4) | SSB (VFS) NH (3, 5, R) | SSC (VFS) NL (2, 6) | SSD (VFS) NH (L, R/4, 5, 6) | SSE (On/Off) NC | |||
| D | 1 | On | On | Off | On | Off | Off |
| NC = Normally closed NH = Normally high NL = Normally low |
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