To check TPS throttle angle you need to enter the diagnostic mode:

• Make sure kill switch is set to RUN.
• Hold SELECT and RESET buttons down whilst turning on the ignition.
• Keep holding the buttons down for at least 8 seconds.
• The dash will clear leaving just “dIAG” in the display.
• Let go of the buttons.
• The SELECT button will now toggle the display between “Co” and “dIAG” (leave dIAG selected).
• Press and hold SELECT and RESET to confirm “dIAG” selection.
• Set kill switch to OFF.

You can now select the diagnostic code for the TPS which is 01. You do this by using the SELECT button to go up through the codes from 01-70 and the RESET button to go down from 70-01.

In diagnostic mode 01 you can verify the throttle angle. The LCD display will show the TPS angle as you twist the grip. Closed it should be reading 15-17 and wide open 97-100 and should move through the digits smoothly from closed to open and back again.

To check the resistance and tracking you will need to unplug the TPS connector. Then, using a multimeter set to Kohm, connect the positive probe to the blue wire’s terminal on the TPS unit and the negative probe to the black/blue wire’s terminal. The maximum resistance should be between 4 and 6 Kohms. Next, move the positive probe on the multimeter from the blue wire’s terminal to the yellow wire’s terminal. Now slowly open the throttle and check that the resistance increases smoothly and steadily without any spikes of dead areas and changes in the range of 0 to 6 Kohms. If the resistance drops out of suddenly spikes or there are dead areas in the range then the TPS is faulty.

With the connector refitted you can test the TPS voltage as well by pushing the multimeter’s probes (set to Volts) into the back or the yellow and black/blue terminals of the connector. It should read around 0.7V in the closed position and 5V in the open position.

Unlikely now, but you never know? Those that don't ask don't get!

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