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Simon Kribstock

Erratic sensor signals, unstable 5v supply

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Just plugged in my WRX6 plug-in ECU for the first time. Upon switching the ignition to "on", engine "off", I immediately heard my IACV cycling. I connected to my ECU via PClink, and noticed erratic readings. I updated the firmware and readings remained. I flashed a tune with the proper calibrations for my MAP sensor, injectors, etc. and performed a TPS calibration. Erratic sensor readings remained and now included an erratic TPS signal. 

 Another issue I'm running into is a repeated request to unlock the ECU.

Any ideas?

Attached is a video screenshot.  Please excuse my post edits haha. Haven't figured out how to remove dupilcate videos

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For the "ECU unlock problem", whats your PC Link version and firmware version?  View these in Help>about and Help>ecu information.  Has it actually been unlocked?

For the erratic sensor readings problem, the only thing I can think of that all of those sensors has in common is the 5V supply and the sensor ground.  Can you have a look at the runtimes screen (F12), ECU status tab, and tell us if the 5V looks stable.  Pic below to show where to find it:

dzbart.png

 

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PCLink v5.6.5.3338, Firmware 5.6.5.3389 I have unlocked it once

I noticed tonight I had a fault code 74: analog 5v supply error. Not sure why I didn't see that yesterday. Checked the runtimes screen and it was fluctuating below 1volt.

Only wiring modification was s 01-07 WRX STi Omni 3bar MAP sensor so I disconnected it and everything seemed cured. I may have used some bad pinout info from a unnamed forum :(.  I'll re-pin tomorrow and see how it works.

 

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57 minutes ago, Simon Kribstock said:

PCLink v5.6.5.3338, Firmware 5.6.5.3389 I have unlocked it once

There should be no problems with those versions.  If you go to >ecu controls>ecu unlock, are all the "unlocked features" checkboxes showing as checked?

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Lock/unlock issue has been resolved. Could updating the firmware after unlocking the ECU cause it to request unlocking again? Either way, it's good now.

I also resolved the the 5v supply error as well by properly pinning my MAP sensor :rolleyes:

Thanks Adam

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