GSX-S TPS Adjustment
One of the few issues with the Suzuki GSX-S1000 is the snatchy or jerky throttle response and one change that can go a long way towards curing this is setting Throttle Position Sensor. On a number of motorcycles it seems to come from the factory with the Suzuki GSXS TPS incorrectly set. TPS setting can make an enormous improvement to your motorcycle. Early bikes have an indicator but TPS Voltage is more accurate and TPS Voltage can be set on all Suzuki GSXS.
The Suzuki GSXS TPS comes with a white painted TPS check alignment mark which seems to be off on most bikes, it should be aligned exactly, but don’t set it using the white mark – it is not accurate enough to set the Suzuki GSXS TPS, but after adjusting it correctly using one of the methods below the Suzuki TPS white marks may be aligned, but don’t worry about it.
Why adjust TPS
Update – Video on Suzuki TPS adjustment at the bottom of the page
There are 2 ways to set the Suzuki TPS, using the dash markings or a voltmeter, the latter is more accurate but the former is usually close enough. For the dash method you need to use the Suzuki special tool, below or a short piece of wire (or paper clip etc.) On the 2017-18 models the GSXS TPS can only be set using the voltage method as the dash marking don’t appear to help in adjusting TPS. Before adjusting the TPS the fairings must be removed and the tank lifted, see here for instructions.
TPS Learned value
The ECU stores an offset value for the TPS called the learned value, this offset should be reset after adjusting or replacing the TPS (it there to allow for voltage drift over time).
This can be reset by Suzuki SDS, Healtech OBD, or Woolich racing software.
Adjusting TPS with dash
The image below shows how to put the Suzuki GSX-S in to DTC or Dealer mode. The Dealer mode or SDS connector is under the pillion seat on the right side of the bike (sitting on the bike) using a special tool, alternatively just link the bottom two terminals in the connector.
Alternatively If you don’t have the special tool, just attach a piece of wire or paper clip between the two lower terminals (marked in red below) on the connector under the pillion seat.
Then adjust the TPS to get the line to line up in the centre as highlighted in red above. Lift the tank and find the TPS on the right hand side (looking from the rear), disconnect the STP (Secondary Throttle plate) sensor temporarily and use a T25 security torx bit to release the TPS and adjust by levering it against the head a tiny bit at a time with a largish flat screwdriver, a tiny movement makes a big difference, until the lines are aligned, with a little throttle it should move to the upper line. Once adjusted the on-off throttle transition should be much smoother. If you adjust too far you will not be able to adjust traction control settings so check you can still adjust the traction control before replacing tank and fairings.
T25 Torx security bit, (also none as Torx Tamper resistent TR25) note the hole for the pin in the centre – not a usual T25 bit
Blue is STP connector, needs unplugging to get to torx bolt.
Red is the Torx T25 bolt that locks the TPS in place
Yellow is the TPS connector that needs to be unplugged and connect to break out lead if using voltages for TPS setting.
TPS Voltage setting
The better alternative is to use a special tool that allows you to measure the voltage read at the TPS. The Suzuki part no. is 09900-28631 but the Kawaski part is identical and cheaper and can be used to adjust the Suzuki TPS setting, Kawasaki Part Number is 57001-1538. This is attached to between the TPS and its connector and has 3 break out connectors. After adjustment the painted white lines should line up.
Use a largish flat screwdriver to gently lever the TPS here once the torx bolt is released
Kawasaki Part Number – 57001-1538
Suzuki Part Number – 09900-28631
Use the breakout lead as below, the voltage with the engine fully warmed up and idling should be between 1.10 and 1.14 Volts, best results at 1.13V
Suzuki GSXS TPS Adjustment Video