Question about 1994 Ford Probe

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What are the parameters in ohms for the 1994 probe se tps ?

What is the idle reading in ohms or the resistance reading when the throttle position switch is in the idle position?

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  • Ford Master
  • 808 Answers

They are easier to test on the car 3 wires 1) 5 volt reference 1) signal return (testing this wire) last wire is ground. place + lead of a volt meter on the signal return wire with key on engine off negative lead on block or battery resting closed throttle should .3 to .8 volts slowly increase throttle opening and watch meter it should increase without voltage ever going lower E.G 1.0,1.1,1.2,1.3,.09,1.5 the .09 is a drop sensor bad this should continue to wide open throttle with a ending reading of 4.95 and above voltage. rdo this several times to catch a glitch.

Posted on May 11, 2014

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Posted on Jan 02, 2017

  • 17 Answers

SOURCE: 2001 Ford Explorer Sport Throttle Position Sensor

Hi, Take a little time to check all earth mounts,There are some fine earthwires under the looms running from air intake if one of these is broken or dirty it can cause all the symptoms you describe. All the best. Phil

Posted on Sep 11, 2008

jmeyer847
  • 185 Answers

SOURCE: engine is revved up like the throttle is stuck and won't idle dow

Sounds like you have a bad Idle Air Control Motor. These are usually less than a hundred bucks at your local auto parts store. Good luck to you and thanks for using fixya!

Sincerely,

JC

Posted on Jan 22, 2009

tepfy
  • 319 Answers

SOURCE: 1994 probe se starter keeps going bad

make sure you replace the solenoid and check your wires going to the starter and thew the solenoid. It sounds like your either getting a short or to much power. let me know what happens.

tepfy

Posted on May 01, 2009

  • 645 Answers

SOURCE: my 2000 ford focus se read p1120. already replaced

does your engine idle fast or slow? You may need to clean the idle selonoid or the throttle body. They carbon up and stick.

Posted on May 22, 2010

  • 27 Answers

SOURCE: my 1988 ford bronco full size has problems

replace TPS, when air is cold more gets in when hot less gets in. it may not be getting air fuel mix correct. also run codes to see if any other parts show to be failing or failed.

Posted on Aug 01, 2010

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94 Jeep Cherokee TPS - back feed


You are still getting high or low voltage at tps? What is the voltage and do you have a unstable idle? Put you + lead on terminal 3 and - lead on terminal 1 turn ignition on and check voltage to be at approximately 5 volts. You can also back probe with it connected at center wire and ground probe to a good ground at engine. Turn ignition on it should read between 0.20 - 0.90 slowly manually open throttle it should rise all the way to 4.5 voltd at full open. If its bad change tps if no 5.0 volts from pcm on first test check connections at pcm. The center tps connector supply wire comes from pin 22 and connection 3 ( which is 5 volt supply ) comes from pin 6. You should be able to back probe pin 6 turn ignition on and have 5 volts. If not 5 v brain has problem.

Sep 08, 2014 | 1994 Jeep Cherokee

1 Answer

Po123 04 kai


Hello www_ropesmor,

This code P0123 is Throttle position sensor circuit high input.

There four basic reasons for this code.

1. An open or short to ground between the TPS (throttle position sensor) and the ECM (Engine control module).
2. A short to battery voltage between TPS and the ECM.
3. A short between the TPS wires.
4. A faulty TPS.

See below for connector diagrams.

First, with scan tool monitor TPS with throttle closed voltage should be
I f you don't have a scan tool, back probe terminal 1with a volt meter to ground and you will see the voltage as outlined above otherwise follow the steps below.


1.Check to see if there is about 5 volts at the TPS; with engine off key on disconnect the TPS back probe the harness side terminal 3 to ground with a volt meter if there is about 5 volts go to step 2 if about 5 volts if not repair the 5 volt circuit.

2. Probe the harness side terminal 2 to chassis ground with a volt meter, if voltage above .02 repair circuit 2 short to voltage. If voltage is .02 volts or below go to step 3.

3. Probe the harness side terminal 1 to ground with volt meter if below .5 volts go to step 4 if not repair short to battery between TSP harness and ECM connector

4 Turn the ignition off and disconnect the ECM connector . With an ohm meter measure the resistance between the ECM (terminal C18) and TPS ground circuit it should be below 1 ohm. Measure the resistance between the ECM (terminal C8) and TPS signal circuit it should be below 1 ohm. If not repair the open circuit.

After faulty circuit is found and repaired clear code and verify repair.

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I hope this helps.

Regards,

netvan

Aug 15, 2011 | 2004 Kia Optima

1 Answer

I have a 1990 hyundai excel that idles irratic when I first shift into drive in the morning, sometimes stalls when I hit the gas. Problem seems to go away as car warms up. Timmings good, compressions good,...


Without actually inspecting/looking at the vehicle, the problem sounds like it's the Throttle position sensor (TPS). Before buying this component, you need to 'bench-test' it to be sure. The TPS is merely a potentiometer (variable resistor - POT) with center tap and two wiper plates (when the throttle is fully closed, the resistance in TPS A is at maximum and in TPS B is at minimum. When the throttle is wide open (W.O.T. - wide open throttle, the resistances of 'A' and 'B' circuits are opposite each other - A minimum and B maximum). The computer (Engine Control Unit - ECU) uses/monitors these signals to adjust/manage the fuel map (fuel trims). Using an analog Ohm Meter, you can test the TPS (or contact someone who knows how), to check for bad spots (erratic resistance changes) in the POT. If the POT is bad, you'll most probably find the problem where the POT is in/near the "IDLE" position... since that's where you mentioned sometimes 'stalls' when you hit the gas.

Feb 08, 2011 | 1990 Hyundai Excel

1 Answer

2000 chevy tahoe z71 5.7 v-8 vortec intermittently wont start unless I spray starting fluid in the throttle body ! fuel pressure checks good on the fuel rail and I already replaced fuel pressure regulator...


I can think of four things. Do each in turn and test the engine after completing each one. If it gets fixed early in the list avoid the items later on. 1) check that your throttle interior is clean 'like new' along with the idle air control valve.
2) Idle Air Control Valve IACV - How to check? Physically remove the IACV but keep the electrical connection to it and loosely blank off the ports to the throttle inlet assembly, exposed by the IACV removal. Turn the engine on and examine the IACV valve movement in response to additional loads (power steering inputs etc). The valve should open and close according to demand causing perceptible change in engine speed with increased power demand being made on the engine.

The electrical connector to the IACV can have 2 or 4 pins:-

2 pins: resistance between pins should about 10 OHMS +/- 3 OHMS. Resistance between either of the pins and the valve body is greater than 10,000 OHMS

4 pins: resistance between diagonally positioned pins should be about 20 OHMS
How to fix? If the motor of the IACV has failed then replace it. If the valve is gummed closed by baked oil and carbon then clean it thoroughly with carburetor choke cleaner spray and a cloth. Similarly if the entry and exit ports on the throttle body to the IACV look blocked again clean them out thoroughly
3) Throttle Position Sensor TPS - 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 transition or that there is no transition seen 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



4) Fuel pressure regulator _ Yes I know you have checked it for pressure but at start up when the ignition is at position 2 the fuel pump starts up and pressurizes the fuel rail. As you turn to position 3 "ignition" power is cut to the pump and fuel pressure is maintained by a non-return valve in the pump. If that valve is faulty the fuel pressure in the rail will drop to zero just when you need it and no fuel can be injected. Check the fuel pressure when at position 2 and then switched off; fuel pressure should be maintained for up to 5 minutes with little or no loss. If there is pressure loss then either the non-return valve is faulty or you have leak in the fuel pressure regulator. If it is such a leak, fuel will dribble from the vacuum line connected to it when disconnected.

Nov 25, 2010 | 2000 Chevrolet Tahoe

1 Answer

My rpm are very low car cut off unless i hoid the gas and no engine check ligth on .


Make sure the throttle body interior and throttle plate are clean and then check both the 1) idle air control valve and the 2) throttle position sensor:
1) Idle air control valve - How to check? Physically remove the IACV, keep the electrical connection to it and blank off the port to the intake plenum. Turn the engine on (you will need a little accelerator pedal pressure to keep her running) and examine the IACV valve movement in response to additional loads (power steering inputs etc). The valve should open and close according to demand which when fitted would cause change in engine speed with increased power demand made on the engine.

The electrical connector to the IACV can have 2 or 4 pins:-

2 pins: resistance between pins should about 10 OHMS +/- 3 OHMS. Resistance between either of the pins and the valve body is greater than 10,000 OHMS

4 pins: resistance between diagonally positioned pins should be about 20 OHMS


How to fix? If the motor of the IACV has failed then replace it. If the valve is gummed closed by baked oil and carbon then clean it thoroughly with carburetor choke cleaner spray and a cloth. Similarly if the entry and exit ports on the throttle body to the IACV look blocked again clean them out thoroughly.



2) Throttle position sensor - 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 transition or that there is no transition seen 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.

Nov 19, 2010 | 1996 Ford Explorer

1 Answer

The car sustarted fine, but suddenly shut down as I started driving. It would start again for a split-second then immediately shut down. Battery is fine...it is turning over fine. Can it be a fuel filter?...


Several things could be the cause:- Before looking at the list below ensure that the throttle body interior is spotlessly clean and that the air ducting and all vacuum lines are free of leaks. Check all relays and fuses On the fuel line on the engine there is Shrader valve (like the one for the tire). It is possible to check fuel pressure at this point with a gauge. If there is insufficient pressure here then this points to a possible fault with either the fuel pump, its relay or its fuse.
1) Idle air control - The idle air control is closely associated with the throttle body. Its function is to bleed air to the inlet manifold past the closed throttle plate. There are teo types of throttle control a) a motor that opens the throttle plate a tiny amount b) an auxiliary passage opened by a valve around the closed throttle plate How to check? Physically remove the IACV but keep the electrical connection to it. Turn the engine on and examine the IACV valve movement in response to additional loads (power steering inputs etc). The valve should open and close according to demand causing perceptible change in engine speed with increased power demand being made on the engine.

The electrical connector to the IACV can have 2 or 4 pins:-

2 pins: resistance between pins should about 10 OHMS +/- 3 OHMS. Resistance between either of the pins and the valve body is greater than 10,000 OHMS

4 pins: resistance between diagonally positioned pins should be about 20 OHMS

2) Throttle position sensor - Sometimes with ignition off it is possible to reset the TPS by depressing the accelerator fully and releasing quickly. Ignition might be enhanced by depressing the the throttle slowly. If the car cuts out if the accelerator is depressed quickly this is another indicator of a bad TPS. 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 transition or that there is no transition seen the TPS is faulty.
3) cam or crank sensor faults - 2 pin socket (magnetic - sine wave output). One pin is 'ground' the other is 'signal'. A voltmeter set to 2 volts AC should measure a signal in the 0.2 to 2 volts range on the 'signal' pin.

3 pin socket (Hall effect, magneto - square wave form output). One pin is 'reference' (5volts), one pin is 'ground' and the third pin is 'signal'. A DC voltage should be detectable in the 0.5 to 1.5 volt range from the 'signal' pin.

It is important that the voltage measurement take place at start up when the engine is cold and again, 20 minutes later, when the engine has fully warmed up to operating temperature. Often the voltage output from faulty sensors declines with temperature rise. I appreciate here that due to a lack of starting in your case it just might be impossible to check the 'warmed up' situation. I hope this helps.

Nov 10, 2010 | 2002 Volkswagen Passat

1 Answer

I am helping a friend fix up his 92 G20 5.7L Conversion Van and he has had the throttle body injectors/ bridge replaced with a used one. There has been a full tune-up performed, including coil. New vacuum...


No resistance to check or adjust, with key on, one wire will have 5.0 volts, the next one should have about .50 (1/2) volt give or take .10 volts, the last wire is ground, check with volt meter, connect ground from volt meter on to battery ground, and probe with pos. probe, the wire with 5 volts is out put from ECM, and the one with .50 volts is in put to ECM, to check TPS, on the wire with .50 volts, as you open throttle voltage should go up to 5.0 volts, with no drop in voltage, as you open throttle, if there is voltage drop, bad TPS, to adjust, on wire with .50 volts, with key on, engine off, should read .50 volts, if more or less volts, loosen screws on TPS and adjust to .50 volts, hope this was very helpful.

Sep 15, 2010 | 1992 Chevrolet G20

2 Answers

After reading the trouble code I changed the throttle positioning sensor and now it gets too much fuel floods and will not start.


You have to zero out the postion sensor with an ohm meter. disconnect the plug for the TPS then with an ohm meter turn it to where ohm meter reads 0 ohms with throttle closed, next tighten screws then with ohm meter still connected open the throttle plate it should read 0 ohms till the plate opens and then should increase as it is put in wide open throttle postion, if it goes stratigh over to full postion then the swich is defective remove and take back to autoparts store. then restet the new switch, it is common to get a bad TPS every once and a while.

Jun 24, 2010 | Cars & Trucks

1 Answer

Engine lurches-check engine light comes on. loss of power and does not want to shift above 2nd. reset check engine and all OK until next time. ideas?


First check the Throttle position sensor. Using a multimeter set it to read resistance. The connectors must be disconnected from the TPS. Probe the middle pin and one of the pins, and as you slowly open the throttle by hand the resistance should start changing smoothly. Then keep the probe in the middle pin, and do the same on the other pin. Do this this carefullt because it is easy to get a false reading. Do not buy a new TPS unless you are sure because they are expensive and usually not returnable. Thats why it is important to do the test carefully.

Nov 25, 2009 | 2000 Hyundai Sonata

1 Answer

Looking to find the correct specs to adjust a TPS for a 1994 Mazda 929. Using a multi-purpose voltmeter.


YOU NEED 2 VOLT METERS.FIRST OF ALL START ENGINE.LET IT GET OPERATING TEMPERATURE THEN TURN OFF ENGINE.THEN YOU CONNECT TWO VOLT METERS TO THE TEST CONNECTOR.TURN IGNITION ON AND CHECK THAT CURRENT FLOWS TO ONLY ONE VOLT METER.IF BOTH VOLT METERS SHOW CURRENT FLOW REMOVE THE CAP AND TURN THE ADJUSTING SCREW COUNTERCLOCKWISE UNTIL ONE VOLT METER SHOWS CURRENT.IF NO CURRENT IS REGISTERED BY EITHER VOLTMETER TURN THE ADJUSTING SCREW CLOCK WISE UNTIL ONLY ONE VOLT METER SHOWS CURRENT.INSTALL THE CAP ON THE ADJUSTING SCREW AND DISCONNECT THE THROTTLE SENSOR CONNECTOR.CONNECT AN OHM METER TO THE THROTTLE SENSOR TERMINALS.OPEN THE THROTTLE VALVE AND CHECK THE RESISTANCE READING FROM THE THROTTLE SENSOR.AT IDLE THE THROTTLE SENSOR SHOULD SHOW ABOUT ONE KILO OHM RESISTANCE.AT WIDE OPEN THROTTLE THE SENSOR SHOULD SHOW ABOUT 5 KILO OHMS RESISTANCE.ANY RESULTS OTHER THAN THESE.REPLACE THE THROTTLE SENSOR AND RETEST.

Aug 26, 2009 | 1994 Mazda 929

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