01 - Self-diagnosis, Electrical check
1 - Self-diagnosis function
1.1 - Self-diagnosis function
The automatic gearbox is controlled electro-hydraulically.
The term "self-diagnosis" is specifically for the electronic/electric control.
Additional information
◆ Workshop Manual Golf 1998 ▸, Automatic gearbox 01M
◆ Self-study programmes No.172, 186.
Control unit -J217- with driving situation gear changes (Fuzzy Logic)
Determining the driving situation and driving resistance dependent gear change point happens automatically.
Advantages:
• Gear changes will be consumption orientated
• Maximum engine output is always available
• Individual adaption of gear change points in all driving situations
• Gear change points are infinitely variable
Gear change point variations for gradients
An additional gear change map automatically selects gear changes for gradients dependent upon accelerator
pedal position and driving speed.
• Gear change map for extreme uphill stretches is matched to engine output
• Gear change map for extreme downhill stretches is matched to the braking effect of the engine
Vehicles with data BUS
Comprehensive information on the "data bus" is given in self study programme No. 186.
Advantages:
• Rapid data transfer between the control units
• Less wiring in vehicle
Safety functions of gearbox control unit
The automatic control unit -J217- receives information from components that effect selection of gears and
passes the information on to solenoid valves that control the valves in the valve body.
The control unit is equipped with a fault memory so that in the event of an electronic/electrical component failure
or on open circuit the fault can be determined quickly. Fault are recognized by electrical signals and stored in
the fault memory.
If faults occur in the monitored sensors or components, these are stored in the memory together with an indi‐
cation of the type of fault.
Faults which only occur once, are known as sporadic faults (temporary). Sporadic faults are additionally iden‐
tified as such.
Golf 1998 ➤
Automatic gearbox 01M self-diagnosis - Edition 10.1997
1.1 - Self-diagnosis function
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