This is my first post to this forum. For full transparency, I have posted the same question on Swedespeed.
I would appreciate any help with the following problem:
In December 2015, I purchased a 2005 XC90 AWD with the D5 185ps motor. At that time, it had run around 110k km. After a month of driving (around 1k km), the engine light went on, and the motor went into limp mode. I went to my local Volvo specialist. He hooked his Vida unit on, and it told him that there was an issue with the signal from the DPF temperature sensor.
The garage replaced the temp sensor, and cleaned the DPF (300 Euro). However, when replacing the temp sensor, the garage found that the old temp sensor was not connected as usual to the wire going to the ECU, but soldered with like 10 intermittent pieces of wire, all soldered together. That was the first sign something was really wrong.
After 50km driving, engine light went on again. I went back to the garage, Vida showed same error, and they replaced the temp sensor under warranty (0 Euro).
After another 100km of driving, engine light came on again, back in the garage, Vida showed same error, and they completely replaced the wire from the DPF temp sensor to the ECU (another 300 Euro). The old wire consisted of another 5 wires soldered in series....
After another 75km of driving, engine light came on again. This time, the garage replaced the complete ECU (1500 Euro).
At this time, (and after reading up a lot on this forum), I had purchased a Chinese version of Vida with a Dice unit myself. I went on a holiday, from Switzerland, to the south of France, to the Netherlands, and back to Switzerland (around 2000 km). The engine light came on many many times. Many times, I looked with Vida, and then I erased the same fault again (DPF temp sensor fault). However, many other times, I just continued driving. Then the engine would move into limp mode after a variable amount of time. Many times the engine would then come out of limp mode, allowing me to drive normally. It is completely unpredictable when the engine light comes on, or then when the engine goes into limp mode, or when it comes out of limp mode again.
Using Vida, I recorded some data, to see if I could identify the source of the DPF temp sensor error. Unfortunately, one can only graph 5 parameters at the same time.
I noticed that the Battery Voltage remained around 13.6V, even when accelerating hard. When the DPF sensor error happened, no extremely low value of Battery Voltage was observed. I conclude that it is not likely to be a low voltage.
Similarly, the alternator provided approximately 40A continuously. Seems good enough for me to charge the Battery while driving.
DPF sensor temperature consistently showed more than 300 oC when the error happened. One time, I observed a DPF temp of 600 oC. I don't know if this is within the normal range.
I actually don't know what to do, anymore
. Can anyone recommend me what to measure with Vida that would help diagnosing the issue, or who to contact for further information?Or is there anything I can do with the DPF sensor that would remove these errors from happening?
Many thanks!
KR, Henk
