Nanocom - 3 Pot Readings on a 2 way Throttle Pedal?

**Milton477** · 8th July 2015, 01:04 PM

Hello fellow Land Rover tragics,
Would anyone know what the "Pot Trottle 3" on the Nanocom is showing when my vehicle is set up for a 2 way throttle pedal. The first 2 ways show 0-5v & 5-0v as you press the pedal & seem to mirror each other consistently. The third way, ("Pot Trottle 3") which according to Nanocom instructions should be close to "Pot Trottle 1" shows 9v if I stomp on the pedal & is generally reading a higher voltage than "Pot Trottle 1". Where does the 9v come from if there is only a 5v supply to the pedal?

I'm chasing a fault where my vehicle sometimes refuses to accelerate at all & will only idle for a few seconds before then accelerating as normal. No fault is logged. I have just changed the IAP/IAT as the temperature part of the sensor was fluctuating wildly between 119 deg & 0 deg & logging a fault. The only consistent fault logged is the EGR failed to open - EGR is blanked so I can understand the fault. All other sensors seem to read within reason according to what I can see in the Nanocom Graphic Viewer. I am able to compare files as far back as 2009 so I have a good idea of what has changed & what has not.

**sierrafery** · 8th July 2015, 01:25 PM

That track 3 reading is a glitch, happens to most of nanocoms don't bother with it cos if the ECM is the original MSB one it doesnt even have an internal link to that input...or do you have a NNN ECM fitted? ...in this case it is remapped with Eu2 map?

give some contact spray in the ECM black plug and in the TPS plug... keep nanocom plugged and watch the TPS readings(especially track 1) when the symptom occurs

**Milton477** · 8th July 2015, 11:05 PM

Originally Posted by sierrafery

That track 3 reading is a glitch, happens to most of nanocoms don't bother with it cos if the ECM is the original MSB one it doesnt even have an internal link to that input...or do you have a NNN ECM fitted? ...in this case it is remapped with Eu2 map?

give some contact spray in the ECM black plug and in the TPS plug... keep nanocom plugged and watch the TPS readings(especially track 1) when the symptom occurs

Thanks sierrafery.

**Fast Freddie** · 9th July 2015, 03:13 PM

You say that your EGR is 'blanked'. Have you removed the EGR unit from the car completely, or simply blanked off the exhaust port?
Depending on your model, there's a butterfly valve (like an old-fashioned throttle) in the EGR body which needs to be wide-open all the time for the best performance. You wouldn't want an EGR fault to leave that sucker closed.
Just a thought. Good luck.

**Milton477** · 9th July 2015, 04:22 PM

Thanks Fast Freddie. EGR is all gone, not just blanked so ECU has nothing to play with hence the fault I think. The fault existed before the current problem started happening.

Another question - what will the ECU do if it thinks that the air temperature at the IAT is at 120 deg?

**sierrafery** · 9th July 2015, 11:53 PM

That IAT value is common for sensor failure so you must replace the MAP/IAT sensor... it can be the root of the symptom you described in the first post too.. at the beginning it used to be intermittent

**Milton477** · 10th July 2015, 03:37 PM

I have replaced the MAP/IAT sensor & have not had the problem since so here's hoping the faulty IAT is the cause of the problem. As far as I can seen from the data, I only had a problem when the IAT was reading 120 deg. I need to do some longer trips to confirm the problem has gone & I have a spare throttle pedal with me just in case.

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