Sync loss, TPS and MAP problems

Sync loss, TPS and MAP problems#44999

By kocene - Tue Aug 25, 2020 12:36 pm

- Tue Aug 25, 2020 12:36 pm #44999

Hey everyone, I have some problems with my speeduino... My setup: BMW M50NV with pazi 2.0 board.

When I built the board I had troubles with my injectors not opening. Hardware test turned out fine and I fixed this by getting a new Arduino. The car started up fine after that but I had some TPS problems. The ADC Count dropped when I turned on the ignition (see the video below) and also when the engine was running the TPS was reading 0 (or was very spikey and erratic).

TPS problem: https://www.youtube.com/watch?v=kNah3E8-LrA

I thought that I have a bad TPS so I drove the car about 50km to my friend to try out his TPS just to make sure. On my way there, the car run alright with autotune enabled. When I got there, the problem persisted even with different TPS, so I decided to drive home. However the car would not start. When I checked the log it seems like the MAP is acting up (stays at 98kpa).

I looked for short in the wires but could not find any. Checked the ground but they are good. Not really sure what to do now. Any input would be helpful.

1st log: cruising, TPS not working but MAP is
2nd log: start up attempts. TPS and MAP not working + the O2 sensor is unplugged.

Attachments

50kmautotune.msq

(62.2 KiB) Downloaded 247 times

2.msl

(67.14 KiB) Downloaded 253 times

1.msl

(562.05 KiB) Downloaded 239 times

Re: Sync loss, TPS and MAP problems#45001

By jonbill - Tue Aug 25, 2020 5:27 pm

- Tue Aug 25, 2020 5:27 pm #45001

I had a problem where the ADC on my TPS was elevated and erratic while my o2 sensor was warming up and not giving a signal. I now have a switch between my o2 sensor and the Speeduino so I can wait until the 02 sensor is sensible before connecting the speeduino.

Re: Sync loss, TPS and MAP problems#45002

By kocene - Tue Aug 25, 2020 6:26 pm

- Tue Aug 25, 2020 6:26 pm #45002

jonbill wrote: ↑Tue Aug 25, 2020 5:27 pm I had a problem where the ADC on my TPS was elevated and erratic while my o2 sensor was warming up and not giving a signal. I now have a switch between my o2 sensor and the Speeduino so I can wait until the 02 sensor is sensible before connecting the speeduino.

Thank you for the suggestion. I have my O2 sensor on a switch as well but the problem persists even when the O2 sensor is fully warmed up or completely turned off so I don't think there is a correlation.

Re: Sync loss, TPS and MAP problems#45020

By noisymime - Thu Aug 27, 2020 12:32 am

- Thu Aug 27, 2020 12:32 am #45020

Assuming you've calibrated the TPS correctly, try measuring the 5v reference to the TPS and making sure it's stable.

If your MAP is playing up then it's possible the 5v signal is not stable, which would cause issues with both the sensors.