Hydraulic Components Overview
| Callout | Component Name |
|---|---|
| 1 | Torque converter |
| 2 | Valve housing: |
| 2a | Solenoid |
| 2b | Linear solenoid |
| 2c | Control valve |
| 3 | Clutch, brake |
| 4 | Oil cooler |
| 5 | Oil pump |
| 6 | Planetary gear |
| 7 | Oil pressure |
| 8 | Transmission oil, inlet |
| 9 | Transmission oil, return |
| 10 | Operating pressure |
| 11 | Lubrication |
| 12 | Oil flow to pump |
A special automatic transmission fluid must be used. The transmission does not have an oil dipstick. The drain plug has an extra, central plug for checking the level that is connected to a pipe that reaches up to the correct level in the box. Fill the oil through the conventional filler plug until the level is correct and oil runs out of the level hole.
The temperature of the oil is important when checking the level. The temperature can be read with a scan tool.
All the friction elements are applied hydraulically. The hydraulic pressure is generated by a pump driven by the engine. The pump is mounted in the transmission behind the torque converter. The drive is direct from the torque converter.
Oil passes to the valve housing where the manual valve is integrated. The valve is affected by the gear selector wire, which in turn is operated by the selector lever. The valve has 3 positions, P/N, R and D/M. In position P/N, the oil will drain directly back to the transmission sump. In position R, the oil will pass directly to brake B2, which is used for reverse gear. In position D/M, oil will pass to the circuits used for the forward gears.
To control the flow of oil to and from the friction elements, 6 stepless (linear) solenoids are used. With them, TCM can regulate the pressure precisely. Each solenoid is activated by the TCM logic to control directly each friction element.
The table below shows the linear solenoids and their task.