Hi all Ecuedit members, I have a following problem:

Vehicle: Audi Q5 FY (2017)
Engine: 2.0 TDI EA288 - CHNA 140 kW / 190 HP
ECU: Bosch EDC17C74 - Software version 9973


SCR Inducement Level / Group 4 active (engine restart inhibition countdown)

The vehicle displays the AdBlue warning "No engine restart in 1000 km". The system is already
in SCR inducement mode (Group 4) due to a previous SCR/AdBlue-related issue. An SCR
inducement test drive via ODIS-S cannot be completed because the ECU continuously requests
a DPF regeneration first - even though multiple regenerations have already been successfully
carried out...


Both a stationary DPF regeneration and a regen during driving have been performed and were
reported as successful in ODIS. But during the SCR inducement drive procedure, the ECU
still demands a completed DPF regeneration before allowing the inducement removal test to
proceed. This results in a logical deadlock: the inducement cannot be cleared without a
recognized DPF regeneration, but the ECU does not acknowledge the regenerations that were
already completed. No current DTCs are stored, and physical DPF parameters are within normal
range.

Components Checked and Work Already Performed:

DPF System
• G450 Exhaust pressure sensor - OK
• G505 Differential pressure sensor - OK
• DPF differential pressure: approx. 12 hPa (normal)
• DPF professionally cleaned
• Measured soot mass after regeneration: –7 g
• Calculated soot mass: 2 g
• DPF replacement procedure performed in ODIS - calculated soot mass resets correctly to 0 g

SCR / AdBlue System
• AdBlue injector checked - clean spray pattern, no crystallization
• Dosing active
• SCR catalyst shows no blockage or abnormal backpressure

EGR System
• Low-pressure and high-pressure EGR replaced

ECU
• Software updated from 9972 to 9973
• No current DTCs in engine, DPF, or SCR systems
• Original fault was P204F00 (Reductant System Performance Bank 1) has not returned since repairs


• Approx. 600 km driven since repairs
• Approx. 400 km remaining until engine restart inhibition

Key Question
Why does the ECU not acknowledge the completed DPF regenerations as valid for clearing SCR
inducement Group 4? It appears the SCR logic is waiting for a specific DPF monitor status or
internal completion flag that is not being set, despite normal DPF operating values and
successful regeneration procedures.


- Has anyone experienced SCR inducement remaining active because a DPF monitor did not
reach the “completed” state?

- Are there known specifics of software version 9973 regarding DPF/SCR monitor interaction?

- Are there known adaptation resets, monitor resets, or specific drive cycles that can allow the
ECU to acknowledge the regeneration?


Software Aspect
Would reverting to an earlier software version (8259 / 8350 / 8507) influence how DPF and
SCR monitors interact, or is this strictly a readiness/monitor logic issue independent of software
version?

I don't want to shut AdBlue off, since the system is acutally working. Also SCR efficency is around 96-98%.

Perhaps someone can reset all values if I send them my original ECU file?

Thanks! BR, Srdan