Question about 1998 Jeep Grand Cherokee
Which engine, no engine, no joy. 4.0L inline 6 cyl?
yes, in most cases. most got from 0.5 to 4v.
most ECU learn this as you drive, others the TPS must be calibrated
all this is covered in the FSM>
my online source shows , NO Calibration, proving Autocal ECU.
why not post symptoms, ????
the TPS when bad, have huge lists of symptoms.
and the ECU OBD2 diagnosics on TPS is very poor.
it see the TP go wild and just thinks driver is nuts.
so no errors.just engine goes nuts.
(unless dead open or shorted) (new TBW cars ,totally diffr)
what first happens (pure physics) is the carbon in the POT
wears. and the TP voltage glitches (at your oldest longest used cruise speed, or at near idle (city car, hiway car ?)
it glitches, the ECU goes to ENRICH mode.
or fails to 0v, a negative glitch (scopes rule) and ENRICH mode
fails. and engine BOGS on the fly. then catches up.
how is that.? (it does far more, ask)
here is the fsm quote for 4L
The Throttle Position Sensor, or TPS is connected to the throttle shaft on the throttle body. It sends throttle valve angle information to the PCM. The PCM uses this information to determine fuel delivery volume.
The TPS is a potentiometer with one end connected to 5 volts from the PCM and the other to ground. A third wire is connected to the PCM to measure the voltage from the TPS.
As the throttle valve angle is changed (accelerator pedal moved), the output of the TPS also changes. At a closed throttle position, the output of the TPS is low (approximately .5 volts). As the throttle valve opens, the output increases so that, at wide-open throttle, the output voltage should be above 3.9 volts.
By monitoring the output voltage from the TPS, the PCM can determine fuel delivery based on throttle valve angle (driver demand).
(comments, by me, id does far more than that.. ask)
Posted on Dec 31, 2013
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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
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