37 replies to this topic

[96minimig]

Ok managed to get the TPS off (ruined a screw bolt in the process but hey ordered new M3's)

Wasn't sticking felt absolutely fine smooth and tested it volts showing with the TPS off the car and moving the linkage with my finger slowly 0.2 and going up slowly to 5 volts

Apon doing this I had a error code for TPS and 02 sensor

[96minimig]

Cleared the errors after refitting the TPS and had no errors then tried lambda still on 0.8 limp mode

[FlyingScot]

You should be able to read the at "idle" voltage on the TPS with the ACR it should be close to 0.4V. If it doesn't return correctly this voltage will be higher and in fact if this occurs several times MEMS will record a fault in the log.
The reason for asking the OP to measure the lambda voltage at the plug is exactly what is described above - that the 0.8V is what MEMS is saying (and being read by the ACR) as opposed to what is really being generated by the lambda itself.
FS

Okay so you have ruled out the TPS but you need to measure the lambda voltage at the connector and not what MEMS says it is.
Still think you have a wiring issue....

FS

[96minimig]

Ok I measured the voltage from the lambda green and grey wires of the loom so pressume that's the mems reading which was 1.5v on the green wire and flickering voltage on the grey wire 0.7 0.8 volts. Will get the car warmed up down the road and back and test from the plug of the lambda sensor.

[96minimig]

Right this is going to sound weird as hell.
Measured the voltage on the new sensor plug signal wires measure with my multimeter 200-300 on one and the other signal wire 600 to 800 mv didn't think I had it on the right mv section of my multimeter. I not even sure my multimeter reads mv because it's basic.

HOWEVER ......
I fitted an old Bosch mhk10004 lambda and tried it and once it had warmed up took it down the road and back. I was getting a reading of 0.3's 0.5's very slow mind you but it's different I'll give it that.


Fitted back the new MHK10004 lambda from minispares and took it down the road and back. And it's back to 0.8 stuck again. Aarrrrrrgh! Talk about bang your head on a brick wall

Edited by 96minimig, 10 February 2016 - 08:56 PM.

[tmsmini]

It seems like the possibility of a wiring issue is present. I know that the harness can get chaffed if not clipped out of the way. Are there any abrasions on the harness branch to the sensor? Is one of the contacts in the connector not making good contact with the plug?

Terry

[David Wayne]

 

I run an MPI so I do not know about the SPI's ECU, but wouldn't there be a check engine indication on the dash when in limp mode?

Nope, nor on MPi, there is no visual indication that MEMS is in limp home mode.

FS

 

Thanks, no check engine light, I learn something new everyday.

 

David 

[symini]

Hi, I know this is an old post but I am getting the identical problem on my SPI mini. Were  you ever able to find the cause?