Question about 2001 Pontiac Grand Am SE
The car has 130k on a 2.4l. Tps volt range .544v closed 4.6v ft.
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Posted on Jan 02, 2017
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Aug 20, 2017 | Cars & Trucks
on Jul 15, 2011 | Mercedes-Benz E-Class Cars & Trucks
Dec 11, 2014 | 2001 Toyota Sienna
Oct 01, 2011 | 2005 Hyundai Sonata
Where is it located? The TPS is found on the exterior of
the throttle body on the opposite end of the throttle shaft to the accelerator
linkage arm. It usually consists of a
small black plastic unit with an electrical connector attached to it.
How does it work? The TPS is a variable resistor made
up of an arc shaped carbon track with an applied voltage of 0 to 5 volts along
its length and a sliding contact that picks up the voltage at any point along
it. The device has three electrical
connections, two provide the voltage range along the carbon track and the third
(most often the middle connection) sends a voltage to the ECU in accord with
the position of the sliding contact point on the arc. This siding contact arm is attached to the
end of the throttle shaft. As the throttle
shaft rotates, opening and closing the throttle plate, the sliding contact
sweeps up and down the arced carbon track providing voltage readings to the
ECU; 0 volts for closed to 5 volts for fully open.
When the engine is at
idle the TPS output should signal the ECU that the throttle is closed
(low volts) and therefore the ECU should either open the Idle Air Control
(IAC) valve or (on some engines) engage the idle speed control motor
to maintain the engine idle speed.
Sometimes a micro contact switch on the throttle body exterior
associated with the throttle shaft is used to detect and confirm when the
throttle plate is fully closed.
How to check?
The socket for electrical connection with the TPS has 3 pins, one for
'ground', one for 5 volts 'reference' and a third (generally the middle one)
for 'signal' output. Back probe the signal pin in the connector to the TPS. Attach the positive lead of a voltmeter to
the probe and measure the voltage output as the throttle plate is rotated. If
working correctly the meter should show a voltage consistent with the throttle
position from approximately 1 volt when closed and 5 volts when fully open.
What is looked for is smooth
voltage increase with throttle change.
If there are drop outs in the throttle transition voltage signal or if there
is no transition then the TPS is faulty.
How to fix? If the track is dirty causing drop outs, try cleaning it with residue-free electrical cleaning spray. If the track is worn it is perhaps easiest to replace the complete device. In some instances it may be possible to adjust the location of the central mount of the TPS contact arm along the throttle shaft by a few millimeters and in the process cause a fresh concentric region of track to be used.
Jul 20, 2011 | 2001 Chrysler Concorde
Jul 11, 2011 | Nissan Quest Cars & Trucks
1) Maladjusted TPS
2) Defective TPS
3) No +5 volt reference to TPS
4) TPS-return to ECM is shorted to ground or to sensor ground
5) Defective ECM
Good luck, i hope this helps.
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