Volkswagen Workshop Service and Repair Manuals

These explanations refer only to this assembly group: Automatic gearbox 01M self-diagnosis. These definitions are not necessarily generally valid.

ABS

Anti-locking brake system. Further information on the ABS can be found in the relevant self-study programmes.

Display group number => Read measured value block

Throttle valve control part

An engine component to stabilize the idling speed. The "throttle valve signal" originates from here. Further information on the throttle valve control unit can be found in self-study programme no.173.

Self-diagnosis

The capability of the control unit:

to recognise faults,

to react to faults,

to store faults,

to register faults and make them available in the measured value block.

Performing self-diagnosis

Connecting the fault reader to be able to interrogate the fault memory.

Influencing the quantity injected

The engine torque is reduced during the gear shift process by changing the quantity injected. Further information on this can be found in Self-study programme No. 172.

Performing electrical check

A targeted check of the electronic components by performing certain measurements.

Fuzzy logic

Monitors the actual driving situation. This item of software in the control unit replaces the previous programme switch. Further information on this can be found in self-study programme no. 172.

Data bus

Transportation of data. To do this the electrical signals are brought into a certain format (bus). Further information on this can be found in Self-study programme No. 186.

Data bus low (high)

The voltage used to transport the data is low (high). Further information on this can be found in self-study programme no. 186.

Gearbox speed sender -G38-

The sender records the speed of the large sun-wheel in the planetary gearbox and transmits it to the automatic gearbox control unit. Further information on this can be found in Self-study programme No. 172.

Road speed sender -G68-

The sender records the speed of the output gear and transmits it to the automatic gearbox control unit (not to the speedometer). Further information on this can be found in self-study programme no. 172.

Initiating basic setting

The values learnt in the control unit are turned back to the initial values. Further information on this can be found in Self-study programme No. 172.

No communication

There is no connection for exchanging information between the control units.

Short to earth

Current flows -incorrectly- to earth without supplying a consumer.

Short to positive

Current flows -incorrectly- to a live component without supplying a consumer.

Read measured value block

The control unit can transfer a considerable amount of test data. This test data delivers information on the operational condition of the system and/or sensors connected to it. In many cases the transferred test data supports fault finding and fault rectification. The test data has been summarized into single display groups because all the information cannot be evaluated at the same time. The information can be selected via display group numbers.

Emergency running

"Condition of the control unit" when certain faults are recognised in order to maintain driving safety, to protect the gearbox against damage and at the same time to ensure that driving characteristics are impaired as little as possible.

Pendulum support

Designation of a part of the assembly mounting. Further information on this can be found in self-study programme no. 166.

Sporadic

Happens occasionally

TDC signal

The signal is used to calculate the engine speed.

Infinity ω

The resistance is infinite, open circuit.

ω = Ohm

Ignition timing control

The engine torque is reduced during the gear shift process by changing the ignition timing. Further information on this can be found in Self-study programme No. 172.