Question about 1998 Jeep Grand Cherokee

1 Answer

Voltage at TPS at idle .65 and up to 2.75 at WOT is this adequate

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Jeep Master
  • 20,706 Answers

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

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

2003 dodge grand caravan surging and running rough when accelerating


I recommend you test the tps according to procedure below. Especially step 8. Suspect you will see drop outs in the voltage, which indicate sensor is worn out.
Operation

The Throttle Position Sensor (TPS) is mounted to the side of the throttle body and connects to the throttle blade shaft. The TPS is a variable resistor that provides the PCM with an input signal (voltage). The signal represents throttle blade position. As the position of the throttle blade changes, the resistance of the TPS changes.
The PCM supplies about 5 volts of DC current to the TPS. The TPS output voltage (input signal to the PCM) represents throttle blade position. The TPS output voltage to the PCM varies from about 0.5 volt at idle to a maximum of 4.0 volts at wide open throttle. The PCM uses the TPS input, and other sensor input, to determine current engine operating conditions. The PCM also adjusts fuel injector pulse width and ignition timing based on these inputs.
Testing

In order to perform a complete test of the TPS and related circuits, you must use a DRB or equivalent scan tool, and follow the manufacturers directions. To check the Throttle Position Sensor (TPS) only, proceed with the following tests.
  1. Visually check the connector, making sure it is attached properly and that all of the terminals are straight, tight and free of corrosion.
  2. The TPS can be tested using a digital ohmmeter. The center terminal of the sensor supplies the output voltage. The outer terminal with the violet/white wire is the 5-volt supply terminal and the black/light blue wire is the sensor ground terminal.
  3. Connect the DVOM between the center terminal and sensor ground.
  4. With the ignition key to the ON position and the engine OFF, check the output voltage at the center terminal wire of the connector.
  5. Check the output voltage at idle and at Wide Open Throttle (WOT):
  6. For 1996 vehicles at idle, the TPS output voltage should be greater than 0.35 volt (0.4 volt for the 2.4L engine). At WOT, the output voltage should be less than 4.5 volts (3.8 volts for the 2.4L engine).
  7. For 1997 and later vehicles at idle, the TPS output voltage should be about 0.38-1.20 volts. At WOT, the output voltage should be about 3.1-4.4 volts.
  8. The output voltage should gradually increase as the throttle plate moves slowly from idle to WOT.
  9. If voltage measures outside these values, replace the TPS.
  10. Before replacing the TPS, check for spread terminals and also inspect the PCM connections.

0996b43f802023e3-xpf45b2xmdrdbg0gt251xk4c-5-0.gif

0996b43f802023e4-xpf45b2xmdrdbg0gt251xk4c-5-5.gif

Jul 26, 2017 | Dodge Cars & Trucks

1 Answer

97 grand marquis,4.6 engine. idles good, but when you go anywhere over 1/2 throttle to WOT it just bogs like a plugged converter. Took exhaust down from engine and still have the same thing.Vacuum gauge at...


vacuum control unit possibly bad hose or unit is dirty,change fuel filter and check voltage regulator as well have starter alternator battery tested at local autoparts store for free

May 07, 2017 | Ford Cars & Trucks

1 Answer

Throttle actuator


What wire are you reading 15 volts on? The ye/wh wire on pin 2 should read 5 volts, and the pk/og on pin 3 should have good ground. pins 1 and 4 should work opposite as the throttle plate moves (pin one ye/we voltage goes up on the way to WOT, pin 4 gr/wh voltage goes down on the way to WOT If you're getting anything higher than a 5 volt reference, check for a short to voltage from another wire in the harness. If that is no good, check the pin out from the ECM directly and see it it is pushing out too much on the reference wire

Jan 27, 2014 | Ford Crown Victoria Cars & Trucks

1 Answer

What should the percentage be on the TPS?


using a scan tool? depends on how the scan tool , interprets it
my scan tool (fancy) has absolute angle and adjusted.
Palmer software... best bang for buck.
when you turn the key on, the ecu sees true zero, (mechnically)
on newer cars the ECU learns this device.
usually a voltage from,. 0.5 to 1v.
on my 3 cars , i must calibrate it to 0.5v
this the ECU uses as 0 deg. adjusted.
or about 5% absolute but varies wildly from make and years.
why are you worried,?
if its linear from near min to max and don't glitch , its 100% GOOD>
do you want me to look yours up. at alldata.com and see if it even is calibrated?
see 7 to 50%here driving
http://www.fixkick.com/ECU/palmer/96M-log2w.jpg

the actual reading is not important
unless, your car must be set to 0.5v like mine
if not right , the idle controls are dead.
on newer cars this is auto calibrated or fixed.
the tps #1 purpose (if a small list ) is to enable enrich mode.
when you move your foot fast the ECU drops closed loop and then
goes rich, the faster the foot, the more reach,.
it does not set air fuel ratio;s just cruising.
The other main sensors do that.
ill list the other TPS jobs
i cut throttle TPS warns ecu of that, and cuts fuel.
cranking wide open throttle cuts fuel , unflood mode
WOT driving, go to enrich, WOT mode, about 12.5:1 AFR and drops
closed loop, who time. Un like enrich mode.
it also controls Dash pot effect and when EGR is active or not.

but idle actual valve is no t import. be it 5 or 10%
over 75% is WOT.
the device is very crude if you read the spec. mines
like 3000 to 5000 ohms. very very crude but very reliable.




Jan 05, 2014 | 2003 Suzuki Aerio

1 Answer

I have a 1994 s10 2.2L tbi stalls and sputters/ when i barely give it throttle it wants to die: however if i mash it it runs fine, its a manual so when i clutch and shift then get back in it it stalls...


Since you have replaced almost all of the parts, maybe the problem is in the wires. I would check for shorting and continuity on the tps harness. The wot signal is getting thru, but there may be issues in between idle and wot. The tps signal is on the dark blue wire. Set your meter to volts DC and measure the voltage on that wire bank-probing the connector wile some turns the key on and slowly pushes the throttle down. Do you see a gradual increase or does it stay flat and then jump? Check for the reference voltage on the other terminals. Also check the same wire voltages at the computer connector. Do they match?

0996b43f80232a6b-j1axptdruxmkgupulmd503d3-4-0.gif

Aug 16, 2017 | Cars & Trucks

1 Answer

Codes are reading low tps voltage, mapps high voltage ignition on low voltage at idle. Idle surges sputers and stalls when driving. Replaceed mapp and tps with no improvment?


Have you consider to check the battery power. I believe the main problem you have is either the battery or the alternator. Due to these two things with low voltage the brain ( ECU ) does not have the enough power to work. Good Luck.

Aug 15, 2012 | 1992 Chevrolet S-10 Blazer

1 Answer

Where is the thorttleposition sensor on 2001jeep cherokee


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:

selectachapter.gif

Cherokee, Grand Cherokee, 1999-2005
Throttle Position Sensor

Print


Operation

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

  1. Disconnect TPS electrical connector.
  2. Remove TPS mounting screws.
  3. Remove TPS.

To Install:
The TPS is mounted to the throttle body. The throttle shaft end of throttle body slides into a socket in the TPS. The TPS must be installed so that it can be rotated a few degrees. (If sensor will not rotate, install sensor with throttle shaft on other side of socket tangs). The TPS will be under slight tension when rotated.
  1. Install TPS and retaining screws.
  2. Tighten screws to 7 Nm (60 inch lbs.) torque.
  3. Connect TPS electrical connector to TPS.
  4. Manually operate throttle (by hand) to check for any TPS binding before starting engine.

4.7L
  1. Remove air duct and air resonator box at throttle body.
  2. Disconnect TPS electrical connector.
  3. Remove two TPS mounting bolts (screws).
  4. Remove TPS from throttle body.

To Install:
The throttle shaft end of throttle body slides into a socket in TPS. The TPS must be installed so that it can be rotated a few degrees. If sensor will not rotate, install sensor with throttle shaft on other side of socket tangs. The TPS will be under slight tension when rotated.
  1. Install TPS and two retaining bolts.
  2. Tighten bolts to 7 Nm (60 inch lbs.) torque.
  3. Manually operate throttle control lever by hand to check for any binding of TPS.
  4. Connect TPS electrical connector to TPS.
  5. Install air duct/air box to throttle body.

Hope this helps

Dec 31, 2011 | 2001 Jeep Grand Cherokee

2 Answers

I have a 07 gmc sierra on machine it said tps/ pedal position sensor A. Any info


This is indicating that the TPS Sensor is either out of calibration or defective however it sends dc low voltage to the computer like at idle it is reading its lowest value and when you tag the pedal(WOT wide open throttle) pedal to the metal...it will read its highest just to let the computer know if you are idling, driving slow or really stepping on it, these various TPS readings gives the computer the proper information to allow the different sensors such as the O2 sensor etc. and the injectors how to behalve through electronic voltage signals all the while keeping your vehicles engine running at its top performance for efficientcy and for clean exhaust emmisions.
The shop scanners are the best to use when replacing or resetting the TPS as with the proper testing for any other electronic sensors on your vehicle, these scanners are a bit too expensive for any one to be owning working on their vehicles, it just doesn't seem to be cost effective.
I think you would be better served letting a certified tech take care of this matter for you.
Hopes this helps

Jul 05, 2010 | Cars & Trucks

1 Answer

Car starts has no power until the gas pedal is almost to the floor. In 2nd the tach is at 3500 rpm and won't shift until i let up on the gas. It also hesitates and is using more gas than usuall.


Check the TPS (Throttle position sensor) wire lead and replace the TPS if any signs of damage or failure.

The Throttle Position Sensor (TPS) is used to send input signals to the Powertrain Control Module (PCM) to indicate the current angle of the throttle blade.

Theory/Operation:
This sensor is a variable resistor that has a 5 volt reference signal applied to it by the PCM. The TPS sends signals back to the PCM in the range of approximately 1 to 4 volts, depending upon the throttle shaft angle. The PCM uses these input voltages to determine the current position of the throttle.
The PCM uses the voltage signals from the TPS and other input sensors to determine the proper air/fuel mixture and ignition timing for certain operating conditions. Some of these operating conditions are: acceleration, deceleration, idle, and wide open throttle.


Typical Readings:
An input voltage of approximately 1 volt indicates a minimum throttle opening, idle, or deceleration condition. An input voltage of approximately 2 volts indicates a cruise or light acceleration condition. An input voltage of approximately 4 volts would indicate a maximum throttle opening or wide open throttle condition.
NOTE: The following procedure tests the TPS only.
  1. The TPS can be tested with an analog voltmeter. The center terminal of the TPS is the output terminal.
  2. With the ignition key in the ON position, check the TPS output voltage at the center terminal wire of the connector. Check this at idle (throttle plate closed), and at wide open throttle (WOT).
    • At idle, TPS output voltage should be approximately one volt. The output voltage should increase gradually as the throttle plate is slowly opened from idle to WOT.
    • At wide open throttle, TPS output should be approximately 4.5 volts.
As always, check the service manual for the proper procedures and specifications for your particular vehicle.

Thank you using Fixya and good luck.

Mar 08, 2010 | 2002 Oldsmobile Alero

1 Answer

DOES MY TROTTLE have anything to do with the codes. becuase my car reves up while in park and while driving it jumps when im about to break. The vovlo dealer check, clean out the trottle, but how do I...


yes the throttle has a sensor on it that measures in volts how far down you have the gas pedal, the computer then uses this to determine how much gas to send to the engine, this is a simplified explanation but mostly correct, the test the dealer wants to do indicates a possible TPS code, correct? what is the code?

Mar 23, 2009 | 2001 Volvo S80

Not finding what you are looking for?
1998 Jeep Grand Cherokee Logo

69 people viewed this question

Ask a Question

Usually answered in minutes!

Top Jeep Experts

yadayada
yadayada

Level 3 Expert

75817 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Kevin Daniels

Level 3 Expert

1455 Answers

Are you a Jeep Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...