FAQ
TL;DR: If your Touran 7‑speed DSG shows no drive in D/S/R, verify hydraulic pressure (target 40–60 bar) and basic coding. As one expert notes, "Measurement group 30, position 3 is to be between 60 and 40 bar." [Elektroda, jacek074, post #16698677]
Why it matters: These checks quickly isolate mechatronics, coding, or fuse issues so you can fix no‑gear and rolling-in-P faults fast.
Who this is for: DIYers and techs diagnosing VW Touran 2009 BLS with 7‑speed DQ200 DSG that lost drive or park.
Quick Facts
- Expected mechatronics line pressure: approx. 40–60 bar (VCDS Measuring Block 30, field 3). [Elektroda, jacek074, post #16698677]
- DQ200 7‑speed coding: use 00020 (pump will not run with all‑zero coding). [Elektroda, jacek074, post #16713546]
- Symptom link: all‑zero coding can cause no pressure and no gear engagement. [Elektroda, markus-wielki, post #16709240]
- Mechatronics oil: G 004 000 (or Dexron III); set pistons to 25 mm during install. [Elektroda, romuald-f, post #16709734]
- Check fuses under hood: No. 2 (30 A) and No. 5 (15 A) for DSG power. [Elektroda, jacek074, post #16705901]
Why does my Touran 7‑speed DSG have no gears in D/S/R?
Loss of drive often traces to zero hydraulic pressure from the mechatronics. In this case, basic coding was erased to all zeros, which prevented the pump from building pressure. Restoring valid coding re‑enabled pump operation. Check coding first when no faults appear. [Elektroda, markus-wielki, post #16709240]
Why does the car roll in Park (P)?
A damaged parking mechanism joint can stop the parking pawl from locking the gearbox, causing rolling in P. After repairing the joint, parking engagement returned, while the no‑drive issue persisted separately. Inspect the linkage and joint if the vehicle rolls in P. [Elektroda, markus-wielki, post #16693071]
What hydraulic pressure should the DQ200 mechatronics show?
Target about 40–60 bar with the engine running. Check VCDS Measuring Block 30, field 3. If you see 0 bar, verify coding, pump power, and fuses before condemning the unit. "Measurement group 30, position 3 is to be between 60 and 40 bar." [Elektroda, jacek074, post #16698677]
VCDS shows no gearbox faults—what should I check next?
Even with no DTCs, verify the DSG power supply. Inspect under‑hood fuses No. 2 (30 A) and No. 5 (15 A). A blown fuse can stop the pump and solenoids, producing no‑drive symptoms without logged faults. Confirm voltage at the mechatronics connector. [Elektroda, jacek074, post #16705901]
Why won’t Basic Settings or Adaptation start?
Adaptation will not run with invalid or all‑zero coding. In the thread, entering a valid code allowed the pump to run and adaptation to proceed. Confirm coding values before attempting Basic Settings. Then recheck pressure readings. [Elektroda, markus-wielki, post #16709240]
How do I code the 7‑speed DQ200 DSG?
Use coding value 00020 for the 7‑speed unit. This enabled normal pump operation and restored communication for adaptation. Avoid experimental values; confirm 00020 is applied and saved. [Elektroda, jacek074, post #16713546]
How do I reinstall the DQ200 mechatronics correctly?
Follow a controlled refit:
- Move clutch release levers away and lock; set selector to N.
- Set mechatronics pistons to 25 mm; guide the unit on alignment pins.
- Mount mechatronics, release levers, and fill specified oil.
"Set the pistons in mechatronics to 25mm." [Elektroda, romuald-f, post #16709734]
What oil and quantity does the mechatronics use?
Use G 004 000; Dexron III is acceptable if unavailable. The mechatronics holds about 1.1 L, while the instruction shows 1.7 L; the contributor reports filling 3 L via the vent during service. Record amounts during drain/refill. [Elektroda, romuald-f, post #16709734]
How do I test DSG pump pressure in VCDS?
Open VCDS, select the transmission module, then Measuring Blocks. Read Group 30, field 3 for line pressure. Expect roughly 40–60 bar with the engine running. Zero indicates no build and demands coding and power checks. [Elektroda, jacek074, post #16698677]
Could a cracked connector cause no‑drive issues?
Yes. A common fault is a cracked mechatronics battery socket/stocking, which disrupts power and control. Inspect the socket and wiring for splits and heat damage. Repair or replace if defective before deeper teardown. [Elektroda, romuald-f, post #16706147]
What is VCDS in this context?
VCDS is the diagnostic software used here to scan the DSG, view Measuring Blocks, and run Basic Settings. The poster also referenced VAS for adaptation attempts. Both tools connect to the gearbox controller. [Elektroda, markus-wielki, post #16705783]
What is the DSG mechatronics unit on the DQ200?
It’s the electro‑hydraulic control module that builds pressure and moves clutch and shift actuators. It houses pistons, a pump, and oil. Installation requires piston pre‑set and correct fluid fill to restore drive. [Elektroda, romuald-f, post #16709734]
Why did the pump start after entering coding 00020?
All‑zero coding disabled pump and adaptation. Entering 00020 reactivated the pump, confirming a software configuration issue rather than immediate hardware failure. Always capture coding before repairs. [Elektroda, markus-wielki, post #16709240]
Is coding value 24 valid on the 7‑speed DQ200?
The poster tried 24, then corrected to 20. Use 00020 for the 7‑speed. After coding, verify pressure and run adaptation. "Coding for 7 speed also 20." [Elektroda, jacek074, post #16713585]
What rare failure should I watch for during reassembly?
If the basic settings stay silent despite power and coding checks, inspect the mechatronics socket for cracks. This edge case interrupts power under load and mimics controller failure. [Elektroda, romuald-f, post #16706147]
