Question about 2000 Toyota ECHO

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How to test the TPS

Throttle position sensor , my clutch hesitates in first gear severely& will not pass smog other smog even though 4 other smog parts replaced

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  • Toyota Master
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The two are not connected if the CO readings high then its a new cat providing the lambda sensors are working

Posted on Aug 07, 2014


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6ya staff

  • 2 Answers


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Posted on Jan 02, 2017


Clint Smock

  • 4669 Answers

SOURCE: car wont pass smog.

Is it running rough? Is the check engine light on?

Posted on May 27, 2009


Jude Meredith

  • 417 Answers

SOURCE: '93 Celica GT 2.2L w/ Auto Trans. hesitates, jerks


sounds like a vacuum leak, injectors clogged, bad plugs, plug wires or maybe low tranny fluid or combo one all, have it dynoed to save yourself some money of course.

good luck


Posted on Jun 29, 2009



  • 234 Answers

SOURCE: Having a problem passing a smog test on 1996 Toyota 4Runner SR5 V

NOX is produced when cylinder temperatures exceed 2500 deg. The systems in place to reduce NOX are EGR and the catalytic converter.
If the number is only slightly higher than avg then I would suggest the EGR, make sure that any vacuum lines are attached and that the diaphragm moves freely, be sure not to damage the rubber inside the EGR.
Retake smog test, if numbers still out of range replace the cat.

Posted on Jan 12, 2010


  • 125 Answers

SOURCE: need 92 toyota paseo to

High HC means moisture in the system. Try driving it longer then take it to the smog shop. Otherwise it could be hard like a head gasket or easy such as a PCV not functioning. Any ways you should always drive it about 20 miles before smog check, longer when the weather is cold.

Posted on Dec 01, 2010


theodore ritter

  • 475 Answers

SOURCE: My 1994 Toyota pickup is showing code 25, and I am

The code 25 is an O2 sesnor code lean condition, the problem is usually not the sensor but another problem, it can be caused by an engine misfire, if that's the case the cause for the misfire has to be corrected first.

Posted on Aug 24, 2011

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Starts and runs fine until accelerating to about 2500rpm then cuts off. why?

make, model, year?
get trouble code from auto parts store that will do it free
suspect tps (throttle position sensor) if scanner found none
other suspects: vehicle speed sensor, engine revolution sensor, ecm or pcm

Oct 14, 2015 | Cars & Trucks

1 Answer

Ok so we replaced the TPS (Throttle Position sensor) but the pc is still giving an error code. Mind you we do not have a check engine light on so the question is how long after replacing the TPS will the...


Oct 31, 2013 | 1997 Mitsubishi Montero

1 Answer

1993 ford escort wagon with automatic transmission, it will not shift into the two higher gears it only has first gear.


There are several things to check.

1) Check transmission fluid level.
2) Make sure that transmission is not in limp mode. That will restrict use of transmission to low gears. Go to the nearest car dealer and do a code scanning.If there are codes stored troubleshoot the codes.
3) Check if brake lights are working. Check brakes switch. The transmission shift lock may be on.
4) Check the TPS. The throttle position sensor is located on the throttle body The sensor detects the opening of the throttle, its output is used by the transmission control module to determine when to shift gears. The TPS is basically a variable resistor mounted on the throttle body. The TPS is tested by reading volts while operating the pedal. Making sure that voltage is in range and that there are no gaps or spikes in voltage changing while the pedal gets pressed slowly and smoothly.
5) Test the transmission switch solenoids. The higher gears solenoids may be defective. The solenoids are part of a pack located on the valve body in the transmission. The solenoids are tested reading Ohms at their terminal.
6) If you do not find anything else check wiring to transmission control module located under the dash. Make sure you did a code scanning.
7) Look for mechanical problems (clutch, valve, gears) inside the transmission.

On automatic transmission problems see also: My car does not shift..




Sep 07, 2011 | Ford Escort Cars & Trucks

1 Answer

Wont switch gears tell at 5500 rpms

check out tps sensor it has a big effect on shifting of vehicle. The data provided by TPS is invaluable for proper startup, idle and easy throttle response of the car. These operations are affected when a bad throttle position sensor feeds erroneous data to the car's computer because of which the:
  • Engine malfunction indicator light (MIL) is turned on
  • The driver of a car experiences difficulty while changing gears.
  • The fuel economy of the car drops drastically.
  • Causes difficulty in setting base-ignition-timing of the car a bad tps causes transmission shift issues, bucking, jerking, idle surging, engine cut off, hesitation on take off, surge while cruising down highway. it may not be that but try another one and find out. you can test the tps, just unplug connector to it. use a ohms meter and hook one lead to the top and other to the center prongs on tps itself. next move throttle very slow, if good tps will move needle on ohms tester it will sweep up without cutting out. but if you perform this test and the needle hesitates at any time you move throttle plate it is bad. 1 is ground, 2 is signal, the prongs on tps. good-luck

Jan 29, 2011 | 2001 Chevrolet Malibu

1 Answer

My 2008 Buick Enclave CXL, V6 Automatic has a problem when trying to increase speed going up a grade or going to the passing gear. First it hesitates as you press on the accelerator then it surges ahead....

I happen to live in Pennsylvania where it is indeed hilly. The TPS can be checked by an engine analyzer or scanner for continuity of resistance increase as you press the pedal down further until it hits 100% with a minimum of 5% when your accelerator pedal is not depressed.

If the engine hesitates and then surges ahead, this points to a possible tune up problem. But, if you have no misses on the OBDII system at the dealer (and that's where a late model car should go) and no service engine soon light then this is certainly a mystery.

Nowadays, they can modify the characteristics of the computer's software to downshift in hopes that the mechanical advantage can overcome any initial hesitation. But, you're saying this is not good enough.

How many miles does it have? Have you had it tuned up regularly?

Jul 16, 2010 | Buick Enclave Cars & Trucks

2 Answers

Failed smog, running very rich. changed plugs, cap rotor, wires, tps sensor, map sensor, egr valve cleaned, Has problem keeping stable ide. all over the place. Any ideas

I've seen two cases recently where it was bad distributors causing rough idle. An honorable muffler shop (not a big chain) will test your catalytic converter for free. Is a '91 throttle body? Do Fords have cold start valve or injector? This can cause rich reading if malfunctioning. Anything controlling fuel delivery into engine can malfunction sending extra fuel. When you find problem; do you know clean oil will help pass smog test?

Mar 09, 2010 | 1991 Ford F150

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.

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

Dtc code p0121 and p2135 2007 chevy malibu

both codes refer to the throttle position sensor, the sensor is at the throttle plate, on the side of the throttle body. to test remove the connector to sensor, use a ohms meter to test. put 1 lead to top connection and the other to the bottom one. move throttle and the needles on the ohms meter should move very even, move throttle slow to get a good reading, needle should move without no hesitation, if the test is bad replace tps sensor. if the sensor gets to bad, it can have an effect on transmission shifting. after fixing sensor have the light turned of with an obd2 scanner.

Feb 14, 2010 | 2007 Chevrolet Malibu Maxx LTZ Hatchback

3 Answers

2002 Dodge Ram 1500. 5.9 V8-518 tranny. New filter/fluid/governor pressure sensor/pressure switch. No trouble codes showing. Need to redline the engine to get it to upshirt 1-2, and 2-3. Once in 4 and 5...

Did you test the TPS ( throttle position sensor)?

The automatic transmission uses throttle position sensor to determine position and opening of throttle, and to decide when to shift into gear.
IF throttle position sensor is defective, the car may have problems shifting into one or more gears, and you may also get no error code from OBDII scanner.

The TPS is tested reading volts on the TPS contacts, while someone else from inside the car smoothly press the pedal.

If the TPS is bad, the voltage will not change smoothly, but there will be gaps and peaks in voltage.

If the TPS is ok, then the next step will be checking the transmission shift solenoid pack located in the valve body. This are tested measuring Ohms on solenoids, and cheching if they get powered. This is unlikely the problem, as you would get a P0700 code from TCM.

Finally the TCM (transaxle control module) may be faulty. This may also return no code, as the TCM will think it is doing its job. This fault is also rather uncommon, and can be tested reading voltages on TCM connectors to TPS.

At a glance, from your broad description, you have a faulty TPS.

Feb 10, 2010 | Dodge Ram 1500 Cars & Trucks

4 Answers

Bmw 3.0 x5 hesitation problems

sound like throttle position sensor.have it check out.also check air duct connected to mass air flow sensor and throttle body.if air duct is loose or will cause severe hesitation.

Jul 21, 2009 | 2009 BMW X5

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