Hi. I am returning Vems ECU 1441 for test and repair for the second time. This ecu was sent back a few weeks ago for test. The ecu is used on an audi UR Quattro with ABY style loom and engine. The ECU has the following problems.
1. There is no cam hall inverter. PLEASE fit cam hall inverter.
2. The ecu is setup for a 1.8T Inlet air temperature sensor. PLEASE change to use a standard ABY IAT sensor.
3. The next problem is a major one. This ecu seems to “crash” when the ignition is turned on some times. It can be ok for a few days and then crash twice in a row. What happens is that when the ignition is turned on normally the fuel pump runs for 1-2 seconds and this is normal. When the ECU “crashes” the fuel pump will sometimes not run at all , or run constantly. When this happens I cannot access the ecu with Vems tune. The only way to recover the ECU is to force the ECU into bootloader by joining pins 2-3 on the RS232 connection. Then I upload the firmware and the config and all is ok for a time again. This can leave the car stuck when it happens and the laptop battery is low. I have tried checking ALL connections and especially power and ground, and made some new connections via a new relay but still the problems exist. As this fault is temperamental and intermittent, if a fault cannot be found then I would like a complete new main board installed. I have another VEMS ecu and it does not give this problem when connected to this car.
4. The wideband lambda would not work on 2 known good sensors. I had used an ignition feed from the same relay that powers the ECU to feed the wideband as the diagram shows, but it wouldn’t work until I also connected 12v to the ecu VIA the wideband pin on the ecu wideband plug. Is this normal? Problem 3 above only started I think once I did this to make the wideband to work.
As you can see I have had many problems with this ECU and need the ECU to be returned ASAP fully tested and with all the above faults and problems resolved.
Thanks Des.