VTPS but not with engine running (?)
#1
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Ok experts. This has got me stumped...![vash](https://www.miataturbo.net/images/smilies/vash.gif)
I installed my VTPS.
It moves full range mechanically.
I calibrated it by acquiring the min and max values & swapping a gage from the dashboard to verify that MS was reading the potentiometer full sweep.
I switched over to TPS based AE on the AE wizard menu and saved/ burned the MSQ to the ECU
I recorded a log with the ignition "on" as I stepped on the gas and it shows the TPS trace working fine but when I drive the car the AE action/change only shows occasionally in the logs.
Any ideas ?
BTW I want to use the TPS based AE to have better control/ recovery of my idle with AC etc...
Thanks
![vash](https://www.miataturbo.net/images/smilies/vash.gif)
I installed my VTPS.
It moves full range mechanically.
I calibrated it by acquiring the min and max values & swapping a gage from the dashboard to verify that MS was reading the potentiometer full sweep.
I switched over to TPS based AE on the AE wizard menu and saved/ burned the MSQ to the ECU
I recorded a log with the ignition "on" as I stepped on the gas and it shows the TPS trace working fine but when I drive the car the AE action/change only shows occasionally in the logs.
Any ideas ?
BTW I want to use the TPS based AE to have better control/ recovery of my idle with AC etc...
Thanks
Last edited by poobs; 01-23-2011 at 04:44 PM.
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I don't know if a log will show it but I attached one.
It is as if the 5V signal drops off or is reduced once the motor starts.
The log basically shows 3 full movements of the VTPS followed by 3 1/2 swings, 1/3 swings and so on.
There is no problem until the engine is started and then the VTPS movement does not show unless I stomp on the pedal.
Does that make any sense ?
Could my modification to the MS to accept the VTPS signal be wrong ?
P
It is as if the 5V signal drops off or is reduced once the motor starts.
The log basically shows 3 full movements of the VTPS followed by 3 1/2 swings, 1/3 swings and so on.
There is no problem until the engine is started and then the VTPS movement does not show unless I stomp on the pedal.
Does that make any sense ?
Could my modification to the MS to accept the VTPS signal be wrong ?
P
![vash](https://www.miataturbo.net/images/smilies/vash.gif)
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Weird, it seems sensitive enough when I am driving around watching the TP % gage on the TS dasdboard but it is damped on the log...
Last edited by poobs; 01-31-2011 at 03:51 PM.
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I found this but I'm not sure what if any applies to my PnP
http://www.shoptalkforums.com/viewto...?f=23&t=122132
My grounds have all been moved to two central locations to benefit the LC-1 groung loop thing....
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I added some to the lower number and subtracted some #s to the top one and the log seems to show it as +3 instead of minus 1 at idle. Then I drove around the block and made sure that I stood on the gas pedal.
It shows a high reading same as the log with the engine off but the rest of the drive, it is as if I was driving at idle the whole time....
It shows a high reading same as the log with the engine off but the rest of the drive, it is as if I was driving at idle the whole time....
Last edited by poobs; 01-31-2011 at 06:54 PM.
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Among other things mine was not returning to zero because I had taken play out of the cable.
Do a calibration, save it and then swap one of the gages to an ADC idle gage or anything that shows the values of the VTPS.
No matter what you do the logs will not show much change if you are running on the MS1 . This will make it harder for reading the logs.
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