Throttle Position Sensor: Adjustments

NOTE: Perform Basic Function Check before attempting to adjust the throttle position sensor. Testing and Inspection

Fig. 1:

Fig. 2:

Setting / Adjustment
- Connect two digital voltmeters into the vehicle circuit as shown, without breaking the existing circuit.
- Set DVM ranges to "VOLTAGE". DVM 1 on 0-2V range (O.OO1mV resolution), DVM 2 on 0 - 20V range.
- Ensure the pedestal is fully closed, i.e. on the mechanical stop.
- Turn ignition on and record voltage reading at DVM 1, DVM 2 should read below 20mV.
- Rotate the throttle pulley very gently towards open, noting the point where DVM 2 reading changes abruptly to above 11v, indicating idle switch open. Record DVM 1 reading at this point.
- Subtract the first DVM 1 reading from the second, a correctly adjusted TPS will give a resulting value of 44 - 54mV.
- If result is outside the stated range slacken the TPS securing screws (6 ) and turn TPS slightly with respect to the pedestal.
- Repeat the adjustment procedure until voltage reading is within the required range.
- Re-tighten screws (6 ) and re-check voltage reading is in range.

NOTE: Angular checks (using feeler gauges) or resistance checks will not be accurate and must not be relied upon.

- Remove DVMs.