Check voltage on throttle position sensor 1988 Ford F250?
Check voltage on throttle position sensor 1988 Ford F250?
Added (1). Three TPS wires Black, Green, Orange.
Looking for 2 readings. 1st at rest is supposed to be .08 - 1 volt. 2nd, throttle open, up to 5 volts
Which wires are used for these readings?
I used to know but it's been so long I forgot?
Find the wire in the TPS connector with chassis ground continuity using the ohm meter, then check the other 2 wires for 5V regulated. The ground and 5VDC can be checked with the connector off, the 3rd will be .08-1V and will need a wire poke while connected to the TPS for testing. The .08-1V is coming from the TPS back to the ECM.
The Black wire is Ground, the outer wire opposite it is the 5 Volt Reference. The Middle wire is the Signal. Backprobe it with a T pin or Paper Clip and measure the Voltage. You should be able to use any Ground. Turn the Key ON and adjust the sensor to get the right voltage at Idle. At Wide Open Throttle, WOT, it should read 5 Volts.
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