VCDS and OBD diagnostic device in the On-Board Diagnostics Shop
Diesel, Engine Technology and Vehicle Technology. Repair, Maintenance and Diagnostics (OBD).

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What is the difference between open-loop and closed-loop control?
1) There is none
2) Open-loop control only acts on one control variable
3) Closed-loop control compares target and actual values, the differences lead to changes in the control variable(s)
4) Closed-loop control is faster than open-loop control
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How much current flows approximately through a commonly installed glow plug?
1) ~2 Volts
2) ~20 Amperes
3) ~50 Amperes
4) ~12 Volts
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What does the duty cycle of the TDI boost pressure control solenoid valve indicate?
1) Shows the turbo shaft speed
2) The engine operates with high compression
3) Low values mean a defective mass air flow sensor
4) It is the control variable to regulate the target and actual boost pressure
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A characteristic of the diesel engine is...
1) self-ignition
2) external mixture formation
3) spark ignition
4) low compression
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