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Author: Subject: Webcon TPS Signal
ttalps2000

posted on 9/10/17 at 09:41 AM Reply With Quote
Webcon TPS Signal

Does anyone know if the signal input on the Webcon TPS kit is 12v? The output Vref is 5v.

Webcon don't give any information on it at all. All they say is plug it into their webcon ecu!

Thanks

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ttalps2000

posted on 9/10/17 at 09:44 AM Reply With Quote
Ignore that! Just read in the megajolt manual, I have a signal voltage output from the ECU, so will assume that is set correctly!
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MikeRJ

posted on 9/10/17 at 09:46 AM Reply With Quote
It's just a potentiometer, the reference voltage is (within reason) irrelevant since whatever ECU it's connected to will be performing a ratiometric measurement i.e. the sensor simply returns a fraction of the reference voltage. That said the vast majority of systems use a 5v reference.

[Edited on 9/10/17 by MikeRJ]

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perksy

posted on 9/10/17 at 09:09 PM Reply With Quote
The Webcon kits instructions give a voltage to set the TPS to, so that it corresponds to the pre-programmed map in the ECU

Theory is you either leave it at that or then take it to a Weber Alpha dealer to have it all set up by them (dealers are thin on the ground though)


Iirc I've got the TPS setting for the 2 Litre Zetec kit that uses twin 45 Webers in the garage somewhere...

Ok found it.....

Setting of The Throttle Position Sensor (TPS)

1 peel the rubber cover back on the connector on the
wiring harness so that a voltmeter can be connected to the pins whilst still connected to the TPS

2 Loosen the 2 screws holding the TPS to the bracket and rotate the potentiometer fully anticlockwise, then re tighten the screws

3 Start the engine and allow it to reach it’s normal operating temperature. Set the carburettor idle speed and balance

4 Connect the voltmeter to the following pins:
Negative Pin 2 (Blue Wire)
Positive Pin 3 (Red/Green Wire)
The reading should be 5V + 0.1V

5 Slacken the 2 screws holding the TPS to the bracket so that it can be moved easily but is not so loose that it will slip out of position

6 Connect the voltmeter positive to Pin 1 (Purple/Blue Wire) and the negative to Pin 2 (Blue Wire), and with the engine at idle, turn the Potentiometer clockwise until the voltage is
0.75V + 0.05V

7 Tighten the screws and re-check the voltage

8 Stop the engine and turn the ignition on, hold the throttle fully open. The voltage should be at least 4V

9 When the calibration is complete, disconnect the voltmeter and re-fit the rubber cover onto the plug

[Edited on 9/10/17 by perksy]

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