Question about 2000 Mitsubishi Galant
What should the voltage of the TPS and APS be at idle? and dose throttle at 20% sound correct?(2000 mitsubishi GDI) someone removed them. is there a special way to set them up? idles too high and little throttle response. anything would help thanks Aaron.
3.0 V6 engine? Key on, engine off the voltage on the Brown/White wire will be .5 to .75 volts. If its not, loosen the 2 screws and adjust it. 20% at idle is NOT correct. should be at "0"
Posted on Nov 16, 2009
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Posted on Jan 02, 2017
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Cherokee, Grand Cherokee, 1999-2005
Throttle Position Sensor
The 3 wire Throttle Position Sensor (TPS) is mounted on the throttle body and is connected to the throttle blade.
The TPS is a 3wire variable resistor that provides the Powertrain Control Module (PCM) with an input signal (voltage) that represents the throttle blade position of the throttle body. The sensor is connected to the throttle blade shaft. As the position of the throttle blade changes, the resistance (output voltage) of the TPS changes.
The PCM supplies approximately 5 volts to the TPS. The TPS output voltage (input signal to the PCM) represents the throttle blade position. The PCM receives an input signal voltage from the TPS. This will vary in an approximate range of from .26 volts at minimum throttle opening (idle), to 4.49 volts at wide-open throttle. Along with inputs from other sensors, the PCM uses the TPS input to determine current engine operating conditions. In response to engine operating conditions, the PCM will adjust fuel injector pulse width and ignition timing.
The PCM needs to identify the actions and position of the throttle blade at all times. This information is needed to assist in performing the following calculations:
Ignition timing advance Fuel injection pulse-width Idle (learned value or minimum TPS) Off-idle (0.06 volt) Wide Open Throttle (WOT) open loop (2.608 volts above learned idle voltage) Deceleration fuel lean out Fuel cutoff during cranking at WOT (2.608 volts above learned idle voltage) A/C WOT cutoff (certain automatic transmissions only)
Removal & Installation
3.7L & 4.0L
Dec 31, 2011 | 2001 Jeep Grand Cherokee
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.
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