Throttle Position Sensor Circuit Low Voltage
#1
09-16-2006, 04:03 PM
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#2
09-16-2006, 09:05 PM
Welcome to FTE Slicker_22.
Well it could be a faulty TPS.(Throttle Position Sensor).
Have you been having driveability probems, like stumbling on acceleration, or it wanting to stall at closed throttle????
If you haven't tested the TPS yet, do so before replacing it.
You should have a 5 volt reference signal at the TPS, at KOEO(Key On Engine Off) so check to see if that is present first, between the ground wire(sig return) & signal wire TP terminals on the TPS.
If not, then check your wiring & connectors back to the computer.
You must have this signal voltage to the TPS..
If the 5 volt signal is present, with the throttle closed, the output voltage to the computer should be between 0.5-1.0 volts DC.
With the throttle wide open, the output signal voltage to the computer should be between 4.0-5.0 VDC.
Check the output voltage on a analog type voltmeter for smooth, steady, changes, as you go from, the closed throttle, to wide open throttle position.
If the voltage change is erratic, or you see dead spots of jerky readings, suspect a faulty TPS & replace it.
You could disconnect the TPS & with a digitial multimeter, set to measure resistance, slowly open & close the throttle & look for smooth resistance changes between 3-4 K ohms at closed throttle, to about 350 ohms at WOT, on the TPS.
If the resistance readings don't change smoothly, suspect the TPS & replace it.
Well it could be a faulty TPS.(Throttle Position Sensor).
Have you been having driveability probems, like stumbling on acceleration, or it wanting to stall at closed throttle????
If you haven't tested the TPS yet, do so before replacing it.
You should have a 5 volt reference signal at the TPS, at KOEO(Key On Engine Off) so check to see if that is present first, between the ground wire(sig return) & signal wire TP terminals on the TPS.
If not, then check your wiring & connectors back to the computer.
You must have this signal voltage to the TPS..
If the 5 volt signal is present, with the throttle closed, the output voltage to the computer should be between 0.5-1.0 volts DC.
With the throttle wide open, the output signal voltage to the computer should be between 4.0-5.0 VDC.
Check the output voltage on a analog type voltmeter for smooth, steady, changes, as you go from, the closed throttle, to wide open throttle position.
If the voltage change is erratic, or you see dead spots of jerky readings, suspect a faulty TPS & replace it.
You could disconnect the TPS & with a digitial multimeter, set to measure resistance, slowly open & close the throttle & look for smooth resistance changes between 3-4 K ohms at closed throttle, to about 350 ohms at WOT, on the TPS.
If the resistance readings don't change smoothly, suspect the TPS & replace it.
#3
09-18-2006, 01:14 PM
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#5
09-19-2006, 12:24 PM
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#6
09-19-2006, 12:41 PM
Ok, good feedback & good to hear you have it put right.
The reason I keep fishing for more details on how the vehicle was acting & how you may have tested or otherwise come to the conclusion the TPS was bad, is because others with similar problems, reading about your particular symptoms, your repair logic & success, may find the answer to their problem too.
So don't hesitate to share any info you care to.
The reason I keep fishing for more details on how the vehicle was acting & how you may have tested or otherwise come to the conclusion the TPS was bad, is because others with similar problems, reading about your particular symptoms, your repair logic & success, may find the answer to their problem too.
So don't hesitate to share any info you care to.
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