FAQ
TL;DR: On DAF XF 106, the VTG ring runs 0–100%; "The most important thing is the turbine ring." Calibrate off‑turbine then on‑turbine with DAF DAVIE to fix P0046/P1727 and EGR‑off complaints. [Elektroda, WloczykijMalaMi, post #17627187]
Why it matters: For DAF XF 106 owners and workshop techs, this FAQ speeds VTG/EGR fault diagnosis and prevents costly mis‑calibration.
Quick Facts
- VTG calibration uses two stages with DAF DAVIE: first off‑turbine, then mounted. [Elektroda, serwis33, post #17618344]
- Set the turbo’s VTG ring to 100% before mounting; ring travel range is 0–100%. [Elektroda, WloczykijMalaMi, post #17627187]
- Reported symptoms: EGR‑off (P1496), louder engine, power loss, and ~35 l/100 km fuel use. [Elektroda, Gacekpl111, post #17619018]
- In this thread, persistent P0046/P1727 was resolved by replacing the VTG driver/controller. [Elektroda, Demon2k9, post #17665271]
- “Programming the VTG motor alone will do nothing” if the turbine ring is misplaced. [Elektroda, WloczykijMalaMi, post #17624255]
What do P0046 and P1727 mean on a DAF XF 106 VTG turbo?
P0046 flags a VTG turbo actuator position or internal error. P1727 flags incorrect or interrupted VTG servicing data. In the thread, P0046 initially could not be erased. After a controller swap, P1727 appeared during driving. [Elektroda, Demon2k9, post #17608735]
How do I calibrate the VTG actuator with DAF DAVIE on an XF 106?
Use DAF DAVIE and perform calibration in two stages.
- Set the turbo VTG ring to 100% with the actuator removed and connect it electrically.
- Run the first calibration with the actuator off the turbine.
- Mount the actuator and run the second calibration. [Elektroda, WloczykijMalaMi, post #17627187]
Do I mount the actuator before the first calibration, or after?
Calibrate the actuator electrically while it is off the turbine. Mount it on the turbo only for the second calibration. "The most important thing is the turbine ring." Ensure the ring is at 100% during the first step. [Elektroda, WloczykijMalaMi, post #17627187]
Is programming the VTG motor alone enough to fix these faults?
No. "Programming the VTG motor alone will do nothing" if the turbine ring is misplaced. The motor is only an executive element. Correct ring positioning and two‑stage calibration are required for success. [Elektroda, WloczykijMalaMi, post #17624255]
What if the first calibration stage fails in DAVIE?
If the first stage fails, suspect the actuator or the tester. "If it does not pass the first stage, the actuator or the tester's fault is faulty." Confirm your procedure is correct, then substitute known‑good parts. [Elektroda, WloczykijMalaMi, post #17628028]
How should I position the VTG geometry—degrees like 220 B0, or percentage?
Position by percentage, not degrees. Set the VTG ring to 100% before mounting the actuator. The ring’s range is 0% to 100%. DAVIE will set the actuator position during calibration. [Elektroda, WloczykijMalaMi, post #17627187]
Can incorrect mounting stop the VTG from calibrating even if I program it?
Yes. Programming will not help if you mount the actuator incorrectly. The module requires correct mechanical alignment and a two‑stage calibration. During programming, the software moves the mechanism through its range. [Elektroda, serwis33, post #17625411]
Im seeing U1159 and U1835 plus P1496what do they indicate and what symptoms occur?
U1159 and U1835 indicate CAN communication errors with the VTG servomotor or actuator. P1496 relates to EGR shutdown. Reported symptoms include louder engine, weaker pull, and fuel use near 35 l/100 km. The poster suspected VTG geometry or valve issues. [Elektroda, Gacekpl111, post #17619018]
Why is fuel consumption up and power down after these VTG/EGR errors?
The thread reports increased fuel use and reduced power when VTG comm or EGR faults appear. The engine sounded different and louder. Expect degraded performance until VTG control and EGR behavior are restored. [Elektroda, Gacekpl111, post #17619018]
What ultimately fixed the OPs P0046/P1727 case?
The solution was a faulty VTG driver/controller. Replacing the VTG controller resolved the persistent errors. The tester and procedure proved correct. The truck returned to service after the controller swap. [Elektroda, Demon2k9, post #17665271]
Which tool should I use to program or match a new VTG unit?
Use the DAF DAVIE diagnostic computer. The VTG control module requires two programming stages. First with the module removed, then with it mounted. This process aligns electronics and mechanics. [Elektroda, serwis33, post #17618344]
Should I check the wiring harness ( beam ) when chasing VTG CAN errors?
Yes, verify the wiring harness when communication faults persist. One contributor specifically asked whether the beam was checked. Inspecting the beam helps rule out CAN wiring issues before replacing parts. [Elektroda, WloczykijMalaMi, post #17635000]
I cant clear P0046; it returnswhat does that suggest in this scenario?
In this thread, a persistent P0046 ultimately pointed to the VTG controller. The controller swap resolved the underlying fault. Consider a known‑good controller if calibration fails repeatedly. [Elektroda, Demon2k9, post #17665271]
What does matching a new VTG mean in DAVIE?
The OP described it as a function to pair or match the new VTG. It is not free‑form programming. Use the DAVIE routine to integrate the replacement module. [Elektroda, Demon2k9, post #17624175]
