Question about 1999 Chevrolet Astro

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Check engine light on with the TPS code. replaced TPS and pig tail and it checked out OK with volt meter. The light still comes back on with the TPS code

What else could be wrong that would make the TPS code come up?

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Check engine light comes on and off, these are indication that there is some error code stored in your vehicles ECM. The engine module computer needs to be scanned. These will give the code and as per the error code the further problem can be detected and confirmed. The engine light indicator blinks or remains steady on dash when engine computer noticed any problem with any engine electrically operated components.

For more help, I suggest you to refer the help links provided below. These will let you know more about which areas to look, check, when there is engine light coming up on dash panel.


Click the link below: -------



Check Engine Light Reset Procedure?
These will help.

Posted on Dec 06, 2012


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SOURCE: check engine light

you need to go to an electronic specialist or you can buy one of the scanners that clears the codes for you from advanced auto or autozone or some place like that.

Posted on Jul 30, 2008



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SOURCE: 2002 monte carlo EVAP problem continues.

did you try a vent solenoid? this is located behind left rear wheel in fender.

Posted on Nov 07, 2008


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SOURCE: Check Engine Light - O2 Sensor - bank 1 running lean

you should have three oxygen sensors on your car, one for each bank of three cylinders; should be towards the Y pipe on each exhaust manifold. Additionally you should have one on the exhaust pipe before the cadilitic converter.

Posted on Nov 20, 2008

GM Elec

Bruce Bracey

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SOURCE: Check engine Light

The P0455 indicates you have a gross vacuum leak in the EVAP system.
Start at the engine and the vacuum purge valve, start checking the vacuum hoses and lines all the way back to the EVAP canister near the gas tank. Make sure no hose or lines are cracked / disconnected.
If all looks OK, let me know and we will proceed from there. Below is a schematic of the EVAP system for reference.
Good luck and let me know.

Posted on Feb 21, 2009


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SOURCE: Check engine light and no power to DLC

Check the fuse that powers the DLC. It might be shared with the cig lighter or aux power sockets adn may have been blown.

Posted on Nov 21, 2009

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1994 Cadillac Fleetwood Brougham "Traction Control" dash light. OBD1 code 4:64, define as TPS malfunction, but the TPS is working perfectly. Where do we go from here.

Did you watch the TPS numbers on a scan tool in your car?
TPS code means TPS bad or wiring or TPS adjustment.
Change the TPS as they cost nothing and do wear out.

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1990 geo metro check engine light blinks 2 fast and one short what does it mean?

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Changed the TPS on my 05 sedona and it reads P0122 code on scanner, after clearing the codes the check engine light wont turn off and the codes still reads P0122, maybe a bad TPS ?

this code may cause by:

TPS not mounted securely.

TPS circuit short to ground or another wire.

Faulty TPS.

Damaged computer (PCM).

to fix this code you can try this:

Carefully check the throttle position sensor (TPS), wiring connector, and wiring for breaks, etc. Repair or replace as necessary
Check the voltage at the TPS (refer to a service manual for your vehicle for specific information). If the voltage is too low that is indicative of a problem. Replace if necessary.
If recently replaced the TPS may need to be adjusted. On some vehicles the installation instructions call for the TPS to be properly aligned or adjusted, consult a repair manual for specifics.
If there are no symptoms at all, the problem may be intermittent and clearing the code may resolve the issue temporarily. If this is the case then you should definitely check the wiring to be sure it's not rubbing on anything, grounding, etc. The code may come back.

Aug 02, 2011 | 2005 Kia Sedona

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What could be wrong when you get code p0122 and p0123

throttle position sensor. check the electrical connection to the sensor for corrosion and security.

If the van is running well, you can try and reset the MIL and see if the codes come back.

If there are symptoms such as the engine is stumbling or hesitating, carefully inspect all wiring and connectors that lead to the TPS. More than likely the problem is with the TPS wiring. Check the voltage at the TPS (refer to a service manual for your vehicle for this specific information). If the voltage spikes or is too high (over 4.65 volts with key on, engine off), then that is indicative of a problem. Carefully trace each wire from the TPS wiring harness to check for breaks, rubbing against other components, etc.

Jan 20, 2011 | 1996 Dodge Caravan

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Failed emission test, codes p1698, p1776, p0700. It is a 1999 Plymouth Grand Voyager, 3 liter

Strange that it failed the emission test. The codes given relate to the transmission computer not outputting the correct signals to the engine (power) control module ECU. Have you noticed any abrupt gear shifts lately? I wonder if the emission test failure is related. Sometimes the gear selection failure can be as result of the ECU getting the incorrect information from a faulty throttle position sensor TPS. The ECU relays the information to the transmission controller and this snatches at the gear shift at slightly the wrong time. A faulty TPS might also be responsible for the ECU setting the wrong fuel air mixture and this would result in inappropriate exhaust gas emission. The TPS is on the throttle plate shaft and is located on the outside of the throttle body. The two outer pins on the TPS plug have 0 volts and 5 volts. The middle pin sends the voltage to the ECU according to the throttle shaft position between 0 to 5 volts. Check out the TPS thoroughly before looking for something more complicated. Then next I would pull the sockets from the respective control units and make sure all the contact pins are clean and bright to ensure good inter connection

Aug 24, 2010 | Plymouth Grand Voyager Cars & Trucks

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I have 1993 Mazda Protege' 1.6 SOHC. The vehicle intermittently hesitates. It feels like you turned the key off then right back on. The Check Engine light comes on and goes right back off in sync with...

Write down the codes , then clear them up , and go for a road test.When above event happens , stop and check the code right away , see what you find and repair according to the code.
I would lean toward TPS too, but I may be wrong.
Fuel pressure can do it too.

Jun 18, 2010 | 1993 Mazda Protege

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P0121 code, 2000 chevy astro

Given that you have replaced the TPS and the PCM, the next step would be to check the connector itself and make sure it is making a good connection and there are no corrosion or anything like that on the connector.

After that, ensure that the TPS has the correct voltage to it, usually its around 5vdc, it should never have full batter voltage to it (12vdc). The PCM usually supplies both the 5vdc reference and the ground for the TPS. Its also entirely possible that (depending on where you bought the TPS) that you were given the wrong one for your vehicle. Not a common thing, but it could happen.

The code will be set if the PCM sees a TPS angle that is not consistent with the RPMs of the engine. If you are having any shifting issues such as hard shifts or the engine having to rev higher to shift, that usually a clear indication there is still something wrong with the TPS circuit even if the TPS itself is good.

Hope this helps.

Dec 31, 2008 | 2000 Chevrolet Astro

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