TPS, what happens is when off? - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 3 Old 09-16-2009, 10:33 AM Thread Starter
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TPS, what happens is when off?

When checking the TPS, how is the bike affected when the indicator is high or low?
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post #2 of 3 Old 09-16-2009, 11:29 AM
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Originally Posted by ddreg View Post
When checking the TPS, how is the bike affected when the indicator is high or low?
The TPS (throttle position sensor) is a variable resistor that provides a positional signal to the ECM indicating throttle opening. As the ECM uses throttle position as one of the parameters in determining the fuel injection pulse duration (i.e. where on the 3D fuel map), the sensor is adjusted at 1200 RPM to put a known voltage into the ECM - above and below the center bar on the dashboard is higher and lower voltages. This TPS voltage is then the known starting position on the map (1200 RPM with a closed throttle, lower front edge of map). If it is adjusted incorrectly, the engine may be at the wrong spot on the map for the actual operating conditions.
(attached image is TL1000 front cylinder FI map).
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Last edited by msi1259; 09-16-2009 at 11:38 AM.
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post #3 of 3 Old 09-16-2009, 11:37 AM
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Quote:
Originally Posted by msi1259 View Post
The TPS (throttle position sensor) is a variable resistor that provides a positional signal to the ECM indicating throttle opening. As the ECM uses throttle position as one of the parameters in determining the fuel injection pulse duration (i.e. where on the fuel map), the sensor is adjusted at 1200 RPM to put a known voltage into the ECM - above and below the center bar on the dashboard is higher and lower voltages. This TPS voltage is then the known starting position on the map - if it was adjusted incorrectly (i.e. low) - the injection map would be at the wrong spot for the actual operating conditions.
(attached image is TL1000 front cylinder FI map).
but what would that look like when riding?

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