SEAT Workshop Service and Repair Manuals

These explanations refer only to this assembly group: Automatic gearbox 099 - 4-speed 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

ATF (Automatic Transmission Fluid)

Gearbox oil for automatic gearbox

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.

Throttle valve potentiometer

An engine component. The "throttle valve signal" originates from here.

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

Reduction in engine torque during gear change by adjusting quantity of fuel injected. Further information on this can be found in self-study programme no. 232.

Performing electrical check

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

Electronic power control (EPC)

Terms like: EPC, electronic accelerator, accelerator module and electric throttle operation all refer to this component. Among other things, senders -G79- and -G185- and a throttle valve positioner are housed within.

EPC is always a component of engine control and thus communicates initially with the engine control unit. Because when doing this, for example, the signal for the kickdown switch is also generated, the engine control unit stores the data in the data bus, in order that other control units have access to it.

Further information on this subject can be found in

• ◆ Self-study programme no. 210.

Throttle position sender

=>Electronic power control (EPC)

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 learnt values in the control unit are set back to the initial values. Further information on this can be found in self-study programme nos. 172 and 232.

No communication

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

Kickdown switch -F8-

The kickdown switch in the accelerator cable has been replaced by a signal from the engine control unit. When the accelerator pedal is depressed to its stop, the gearbox changes down for acceleration.

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.

Wiring

Routing of electrical wiring and components in vehicle.

Selector lever lock magnet -N110-

Located in the selector mechanism close to the selector lever. Prevents movement (involuntary) of the selector lever from positions "P" and "N" as long as the brake pedal is not depressed.

Solenoid valves

Opens and closes the oil channels to the clutches and brakes.

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.

(If you can only select a two character display group number, you have an old programme card in your V.A.G 1551 ! Replace the card with a valid version).

Each display group number is displayed on the fault reader as four display zones.

A display zone can be displayed as an eight digit row or as values. These values are sometimes displayed with a measurement symbol.

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.

Programme card version

Always use the most up-to-date programme card. Further information can be found in the test unit operating instructions.

Sporadic

Happens occasionally

Stationary uncoupling

The gearbox shifts into neutral hydraulically when the vehicle is stationary.

Static

Present at the moment, continuous

TDC signal

The signal is used to calculate the engine speed.

Tiptronic

With an additional selector gate on the right of the normal selector gate, it is now possible to manually change up a gear by moving the selector lever to plus (+) and manually change down a gear by moving the selector lever to minus (-).

Further information on this can be found in self-study programme no.232.

Infinity ω

The resistance is infinite, open circuit.

ω = Ohm

TCC (Torque converter lock-up clutch)

Transfers the engine torque mechanically to the gearbox.

Selector lever position display

Shows in the dash panel insert the position of the selector lever or, with Tiptronic, the gear selected. Further information on this can be found in self-study programme no. 232.

Ignition key withdrawal lock

Ensures that the ignition key can only be withdrawn when park position is selected and in addition mechanically locks the selector lever in this position.

Ignition timing control

The engine torque is reduced during the gear change process by changing the ignition timing. Further information on this can be found in self-study programme nos. 172 and 232.