ATSG Volkswagen “01” Technical Service Information.
The “01M” designated transaxle, shown in Figure 1, fust appeared hi the 1995 model year and was used hi a wide variety of the Volkswagen car lines along with various engine combinations, including the 2.8L V6 engine, as shown hi the chart below.
The “01M” transaxle is a 4 speed unit, with 4th gear being overdrive, and is equipped with a clutch hi the torque converter. Refer to the chart in Figure 1 for the internal components that are applied hi each of the four forward gear ranges. Notice that it has only one freewheel device for 1 st gear.
- Cabrio 1995-2001 2.0L (L4)
- Beetle 1998-2001 1.8L (L4), 2.0L (L4), 1.9L Diesel
- Golf 1995-2001 1.8L (L4), 2.0L (L4), 1.9L Diesel
- GTI 1999-2001 1.8L (L4), 2.8L (V6)
- Jetta 1995-2001 1.8L (L4), 2.0L (L4), 1.9L Diesel, 2.8L (V6)
- Passat 1995-1997 2.0L (L4), 2.8L (V6)
The “01M” transaxle is totally electronic controlled and uses a Electronic Control Unit (ECU) to control shift points, apply and release of the torque converter clutch, and line pressure control. This is done using seven solenoids located on the valve body. The solenoid pattern for each gear and the description of operation is provided for you hi Figure 2. Electrical signals from various sensors provide information to the ECU about vehicle speed, tluottle position, engine coolant temperature, transaxle fluid temperature, gear range selected, converter turbine speed, engine load and engine speed. The ECU uses this information to determine the precise moment to upshift or downshift, apply or release the TCC and what fluid pressures are needed to apply the components.
If for any reason the entire electronic control system of the transaxle becomes disabled, or the ECU detects a problem with one of the various sensors that stores a trouble code, all of the solenoids will be de-energized (Tinned OFF). This “Safety Mode” operating state of the solenoids forces the transaxle to operate in 3rd gear when the selector lever is in the “Drive” range. We have provided you with an internal wire schematic and case connector pin identification in Figure 3. and a chart in Figure 4 to check the resistance of the solenoids and fluid temperature sensor. Refer to Figure 5 to check solenoid mechanical operation on the bench….
- CLUTCH APPLICA TION
- SOLENOID APPLICATION
- INTERNAL WIRE HARNESS AND SOLENOID I.D.
- INTERNAL COMPONENT RESISTANCE CHECK
- SOLENOID AIR CHECK PROCEDURE
- VALVE BODY BREAKDOWN
- SPRING SPECS
- CHECK BALL LOCATION
- COMPONENT AIR CHECK PROCEDURE
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