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Throttle Position Sensor

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Hi Guys,

First post here, hoping that I can get some pointers in the right direction. I am coming to the end of my build, a VH45 swapped S13. For now I will just be running the Stock ECU with a Nistune chip, which I think is best suited for my budget and application.

The engine has a custom intake manifold made and uses an LS Throttle body. I am using this intake manifold over the factory one as it allows me to close the bonnet without any bonnet raisers.

Anyway my question is will the Nissan ECU read a standard GM TPS. From my research the Nissan TPS is 0.40-0.50 v at full closed and 4.2 v at WOT and the GM TPS is 0.5 V full closed and 4.5V at WOT.

1.) Can anyone verify these numbers sound correct?

2.) Can I bench test the TPS with a 5VDC Power supply or will this cook the TPS?

3.) Is it possible to add a small resistor to the TPS circuit to make the GM TPS read less than 0.5V at full closed? I believe the VH ECU is looking for 0.45 Volts for full closed position.

Hope someone can point me in the right direction.

Thanks in advance,


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You can bench test with a 5 volt power supply. Make sure you have all the pin outs correct for both TPS's. Honestly I don't think it will make a huge difference if the voltage ranges are slightly off but I could be wrong. Before you go putting in a resistor and all that I would just drop it in and see how your throttle percentages look as you read the ECU.

Normally the biggest issue is that the ECU sees the correct voltage at closed throttle. Often this is used as part of the idle strategy. Fuel and ignition in VH45 is primarily derived from MAF, not the TPS so the TPS is mainly there for idle and transient enrichment.

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