Question about 1992 Toyota Previa

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What is tps or maf sensor - 1992 Toyota Previa

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Tps is a throttle positioning sensor on the throttle body

maf is a mass air flow sensor which is mounted on the air intake to the air snorkle to the air filter tubing

Posted on Mar 20, 2011

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Posted on Jan 02, 2017

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SOURCE: Idles at 3100 rpm after changing tps

check for vacuum leak, could be power brake assist, high rpm indicates leak

Posted on Oct 26, 2009

Testimonial: "vaccuum leak wasnt the problem, unfortunatly the computer went bad in the car. Thank you for your quick response."

  • 1201 Answers

SOURCE: high idle

Have the idle air control valve checked, might be malfunctioning.

Posted on Dec 22, 2009

fixitriteman
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SOURCE: when i plug in maf sensor camaro idles from 500 to

check temp sensor

Posted on Mar 10, 2010

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SOURCE: 1997 Ford E150 5.0 L

For the TPS you would need a voltmeter to measure the voltage variations as you move the TPS. Usually there is a marking for the stock position which is recommended to be set to that.

For the procedure and values please see link below:

http://fordfuelinjection.com/?p=30

As for the MAF sensor errors can be detected by the ECU. You may use a scanner to check for errors pertaining to the MAF. As to adjustments or fix, the only fix that can be done is by cleaning using ones used by tuners or contact cleaners to get rid of contaminants.

Posted on Apr 27, 2011

  • 5370 Answers

SOURCE: 1998 Astro code P0102 low

Try cleaning the TPS and IAC( idle air control) valve .also clean the throttle body with throttle cleaner.Then see, if that is helping.If not then MAF needs to be replaced, as the error code is triggering towards the MAF.--------
The IAC valve is screwed in to the side of the throttle housing (where the gas pedal hooks up to the engine).You'll need to remove the interior engine cover(dog house).Torx screws for the covers, 2 bolts on floor. and bolts against the fire wall (You can use a long extension with a swivel socket at the end).----------- This will help.Thanks.Helpmech.

Posted on Jun 20, 2011

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I'm sorry it is maf sensor I replaced car is still sputtering like its trying to die if I give it gas


IS it still putting a code for you MAF sensor? Have you tried replacing the PCV valve or checked the spark plugs or TPS sensor? TPS is throttle position sensor

Apr 17, 2017 | Cars & Trucks

1 Answer

Engine trouble code P1295


- Faulty Throttle Position Sensor (TPS)
- Throttle Position Sensor (TPS) harness is open or shorted
- Throttle Position Sensor (TPS) circuit poor electrical connection
- Faulty Powertrain Control Module (PCM)
- Faulty Mass Air Flow (MAF) sensor
- Faulty Manifold Absolute Pressure (MAP) sensor

Jan 28, 2015 | 2007 Hyundai Entourage Limited Minivan

1 Answer

Susuki esteem TPS


old post.
they used 2 engines, one is 1.6L and 1.8L other.
so my guess, is , that
car starts ok. hot or cold engine.
and
car has no power at WOT, (it wont be the TPS)
Is the check engine light on, key on, and does it stay off running?
if not the ECU/PCM (enginebrain) wants to tell you what is wrong
why not ask it.?
ok there are 3 forms of power loss (engine power)
1: WOT, wide open throttle (on most cars that is the MAF sensor)
2: cruising say,at 45mph that too is MAF + oxy sensor.
3: accelerating only, the TPS does cause Enriich mode.
if not , then the TPS is dead.

Jan 23, 2013 | 2000 Suzuki Esteem

1 Answer

I have a chevy Lumina 1997 and I keep getting code P0171and P0121 and would like to know what is causing these codes to keep coming up Thank You


this is an obd2 trouble code table, it can help you understand the meaning of code.
and the cause of p0171:

The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
There could be a vacuum leak downstream of the MAF sensor.
the solution:
In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
Inspect all vacuum and PCV hoses, replace if necessary
Check for a dirty fuel filter and proper fuel pressure

the cause of p0121:

TPS has intermittent open or short internally
Harness is rubbing and causing an open or short in the wiring
Bad connection at the TPS
Bad PCM (less likely)
Water or corrosion in connector or sensor

solution:
1. If you have access to a scan tool, see what the idle and WOT (wide open throttle) readings are for the TPS. Check if they're close to the specifications mentioned above. If not, then replace the TPS and re-check.
2. Check for an intermittent open or short in the TPS signal. To do that, you can't use a scan tool. You'll need an oscilliscope. The reason is because scan tools take samplings of many different readings over just one or two data lines and can miss an intermittent drop out. Hook up your oscilliscope and watch the signal. It should sweep up and down smoothly with no drop outs or spikes.
3. If no problems were noticed, perform a wiggle test. Do this by wiggling the connector and harness while watching the pattern. Does it drop out? If so, replace TPS and re-check.
4. If you have no TPS signal, check for 5 Volt reference at the connector. If it's present, check the ground circuit for open or shorts.
5. Make sure the signal circuit isn't 12V. It should never have battery voltage. If it does, trace circuit for short to voltage and repair.
6. Look for any water in the connector and replace TPS as necessary.

Jul 26, 2011 | 1997 Chevrolet Lumina

1 Answer

Code p1128 weak mixture lose power on inclines engine light on melts spark plugs vehicle hyundia accent 2001


Go to www.hmaservice.com and register your vehicle by VIN #..
you'll then have access to wiring diagrams, shop manuals,
service bulletins, illustrations, etc. To diagnose a 2000 or 2001 1.5L Accent Diagnostic Trouble Code (DTC) P1128 (FUEL SYSTEM LEAN -- PART LOAD), check the following:
  • Check the intake system for air leaks.
  • Check that the Mass Air Flow (MAF) Sensor (P/N 28164-22610) operation meets the specifications listed below. If the MAF sensor output is significantly lower than the reference value (10% or more), then replace the MAF sensor.
Table 1: Using the Hi-Scan Pro in the Hyundai Diagnostic Menus Current Data Screen TPS (%) 0
3.5
5.1
7.4
MAF (kg/h) 10
21
30
47
RPM IDLE
2000
3000
4000
Table 2: Using the Hi-Scan Pro in the OBD-II Menus Current Data Screen TPS (%) 0
3.5
5.1
7.4
MAF (g/h) 2.8
6
8.5
12.7
RPM IDLE
2000
3000
4000


WITH MANUAL TRANSMISSION


Table 3: Using the Hi-Scan Pro in the Hyundai Diagnostic Menus Current Data Screen TPS (%) 0
2.4
3.9
5.9
MAF (kg/h) 9.5
19.4
28.8
43
RPM IDLE
2000
3000
4000
Table 4: Using the Hi-Scan Pro in the OBD-II Menus Current Data Screen TPS (%) 0
2.4
3.9
5.9
MAF (g/h) 2.5
5.5
8
12
RPM IDLE
2000
3000
4000

Jun 26, 2011 | Hyundai Accent Cars & Trucks

1 Answer

I cleaned the MAF sensor and wires, I also replaced the MAF sensor. The engine is still hesitating, but only when it is very cold outside. Should I try cleaning the wires again?


is the check engine light on?

Do not physically touch the heated wires, they are ceramic coated and sensitive. Only spray tehm With carb cleaner or MAF sensor cleaner.

It sounds like you are running lean. IF your TPS is adjustable, it may need adjusting. TPS = throttel position sensor. Other than that, a bad intake air temperature sensor or bad upstream O2 sensor should turn on your check engine light.

Dec 12, 2010 | 2004 Ford Freestar

1 Answer

How to fix code p1121


P1121-Throttle Position Sensor Inconsistent with MAF Sensor.

Air leak between MAF and Throttle Body (Ducting)
TPS Sensor
MAF Sensor

Don't throw parts at it. The code doesn't tell you what to do or change.
Look for the easy stuff and learn how to uses a volt meter on the TPS

Aug 31, 2010 | 1999 Ford Explorer

2 Answers

I would like to clean my tps and mafs. where can i locate these. it is 98 early model


The tps is located on the side of the throttle body, usually black in color and has 2 screws or bolts and a wire connection. Uaually they can't be cleaned, they are a sealed unit.
The maf sensor is in the intake tube that goes from the air filter housing to the throttle body.

Nov 20, 2009 | 1998 Audi A4

1 Answer

Stalls at acceleration


Sounds like there is a good posibility that you have a faulty TPS sensor can you get access to a scan tool to see if there is any codes set and to see if you are getting a TPS(Throttle Postion Sensor) signal,also could be a faulty MAF sensor. MAF=Mass Air Flow

Nov 08, 2009 | 1996 Nissan Maxima

1 Answer

I have engine light on and I got the check engine light codes: P0121 and P0171 for my 1997 Chevy Cavalier. What does it mean? Thank you!!


A code P0121 may mean that one or more of the following has happened:
  • TPS has intermittent open or short internally
  • Harness is rubbing and causing an open or short in the wiring
  • Bad connection at the TPS
  • Bad PCM (less likely)
  • Water or corrosion in connector or sensor
(TPS = throttle position sensor - mounted on side of throttle body and connected to accelerator linkage.)
Causes A code P0171 may mean that one or more of the following has happened:
  • The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
  • There could be a vacuum leak downstream of the MAF sensor.
Possible Solutions Possible solutions include:
  • In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
  • Inspect all vacuum and PCV hoses, replace if necessary
  • Check for a dirty fuel filter and proper fuel pressure
Hope this helps.

Aug 21, 2009 | 1997 Chevrolet Cavalier

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