4AGE TPS adjustment

There seems to be a surprising amount of confusion around this procedure so I decided to make a guide.

All that should really be needed is the BGB.


One thing that many people don't realize is that you are adjusting the idle switch. This is a basic on off switch. The value isn't vital. What is important is that the circuit is connected when the TPS is closed and that the circuit is opened when you just barely open the throttle.

If the TPS is adjusted too tight the ECU will think it's idling when you give it gas. This causes the ECU to cut fuel any time the RPM goes over 1600 RPM. THis can cause jerking and bucking at light throttle.

If on the other hand the TPS is too loose the Idle circuit will never get triggered causing worse gas mileage and other issues.



You will use the feeler gauges as a sort of go no-go gauge


For the thinner gauge (4AGE .35mm) and (GZE .40mm) if you don't have the exact gauge for example closest US equivelent use the next thickest size.


Insert the thin gauge and check resistance.

(Forgive my ghetto TB, I threw it together just for these pics.)


If you get continuity then the switch is on and you should be good. You do want it to be in spec but most important is that you get continuity.

If you don't get continuity you must adjust the TPS until you do.


Next insert the thicker gauge. In this case if you don't have the exact right thickeness gauge use the next smaller gauge.



Now you should measure zero continuity or infinity on some meters.


If you get continuity then loosen the TPS until you don't.


Now go back and check with the thin gauge.

Check, adjust and repeat until you have continuity with the thin gauge and none with the thick gauge. Then you are done and your TPS is adjusted properly.


courtesy of webmatter.de