Throttle Position Sensor (Tps) Adjustment - Holley MPI PRO-JECTION Installation Tuning And Troubleshooting Manual

0" Hg vacuum

18.3 Throttle Position Sensor (TPS) Adjustment

Adjust the sensor as follows:
1 - Locate the harness wiring that connects to the TPS and remove a piece of the sheathing from the GREEN wire and the
BLACK/WHITE wire.
2 - Attach the (+) lead of the digital voltmeter to the GREEN wire (pin B) and the (-) lead to the BLACK/WHITE wire (pin A)
of the TPS.
3 - Loosen the TPS and adjust until the voltage is 0.58 volts. The ignition key must be in the run position for this
measurement.
4 - Retighten TPS and recheck voltage. While watching the voltmeter, move the throttle lever from fully closed to fully open.
The voltage should change smoothly from .58 volts to 4.5-5.0 volts. If the reading fluctuates, the TPS is intermittent and
should be replaced. If the voltage is within adjustment range, turn ignition key off, remove jumper wires and reconnect
TPS.
5 - Reinstall air cleaner assembly. And cover the exposed wiring with electrical tape to prevent shorting.
30
2.3 volts at sea level (less at altitude)