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Car won,t start sometimes & check engine light comes on sometimes had computer codes read said problems with TPS,airflow meter, throttle position sensor

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Before changing any more parts there are grounds on the engine that need cleaned one on the back of intake manifold then you have to remove battery tray clean up the ground there then clean where the tray bolts up as this aids in chassis grounding remove ground cable from bellhousing before you reassemble install star washers btween cable ends and where they bolt up this will dig into ground surface and cables making a better ground then remove turn signals in front there are two on right side and one on left side cleanup and star washer then there is the ground spots for the ecm inside removr kick panel on right side clean up and star washer if the starter doesnt work after this starter is probably bad but the other codes will probably clear out

Posted on Jul 29, 2009


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Codes 32 75 12 22 on a check engine light

first code it's P0320 Possible causes
- Faulty Ignition/Distributor engine speed sensor
- Faulty Crankshaft Position sensor
- Ignition/Distributor engine speed sensor harness is open or shorted
- Ignition/Distributor engine speed sensor circuit poor electrical connection
- Low battery charge
- Faulty Engine Control Module (ECM)

Read more:
2- P0750 Possible causes
- Low transmission fluid level
- Dirty transmission fluid
- Faulty shift solenoid 1 valve
- Shift solenoid 1 valve harness or connectors
- Shift solenoid 1 valve circuit is open or shorted

Read more:
3- P0120 Possible causes
- Faulty Throttle Position Sensor
- Throttle Position Sensor circuit is open or shorted
- Throttle Position Sensor poor electrical connection

Read more:
4- P0220 Possible causes
- Throttle Position Sensor (TPS) harness is open or shorted
- Throttle Position Sensor (TPS) circuit poor electrical connection
- Faulty Throttle Position Sensor (TPS)
- Fault Electric Throttle Control Actuator (or Throttle Body Motor)
- Accelerator Pedal Position Sensor (APP)

Read more:

Sep 11, 2014 | 1991 Ford F150

1 Answer

Why is my truck 2003 dodge dakota 4.7 v8 magnum running rough i dont know what else to do

Lets not change any more parts in the hope problem will be solved...Lets trouble shoot...Most probable cause is the Throttle Positioning Sensor (TPS)...It is located on the throttle body...Has three wire connector: Wire colors are Orange, Orange/Dark Blue, and Black/Light Blue...If you have a wee bit of experience with a volt meter here is test procedure...Leave TPS connector in place...Take two safety pins ...Push one into rear of connector into Orange/Dark Blue and other into Black/Light Blue...Set meter to read 5 volts...Clip + meter lead to Orange/ Dark Blue pin and - meter lead to Black/Light Blue...Start engine...Meter must read .08 volts at idle...Attempt to increase throttle as high as it will go...Meter must read at least 4 volts...If not TPS is the fault...Send results...saailer
* See picture of TPS


Aug 10, 2014 | Cars & Trucks

2 Answers

Car starts will not accelerate, code reader says Code DTC 22 Throttle Position Low

Well code 22 means the signal coming from the TPS is too low. That usually means an open circuit between the sensor and the engine computer. The computer sends a 5 volt signal to the sensor and reads what comes back to the computer. Its possible the sensor is way out of adjustment, but more likely a broken wire or connector between the sensor and computer. You would need a scanner to "see" the data stream from the sensor to know for sure.

Aug 06, 2014 | 1992 Chevrolet Camaro

1 Answer

PO122 and PO405 engine codes

Code 122 is for a low signal coming from the TPS. Since you have replaced the sensor, the problem may be in the wiring harness. The signal would need to be checked.
Code 405 is also a low signal coming from the EGR valve. Same thing, you need to check the signal with a scanner or volt meter.
And when the computer is not getting an acceptable reading from the TPS it uses a known good signal to bypass the sensor which will cause the idle speed and shifting problems. The computer does not know when you open the throttle.

Jun 24, 2013 | 2000 Oldsmobile Bravada

1 Answer

I have a Volvo v70 2.4T that sometimes runs fine but is off the road now because on a regular bases runs lumpy, smells like rich mix, sometimes burny smell from exhaust then goes into 'performance...

Throttle Position Sensor/Switch A Circuit Range/Performance Problem

What does that mean?

The Throttle position sensor is a potentiometer that measures the amount of throttle opening. As the throttle is opened, the reading (measured in volts) goes up. The powertrain control module (PCM) supplies a 5 Volt reference signal to the throttle position sensor (TPS) and usually a ground also. A general measurement is: at idle = .5 Volts; full throttle = 4.5 Volts. If the PCM detects that the throttle angle is greater or less than it should be for a specific RPM, it will set this code.

Potential Symptoms

Symptoms of a P0121 trouble code could include:

Malfunction Indicator Lamp (MIL) illumination (Check Engine Light or Service Engine Soon light)
Intermittent stumble on acceleration or deceleration
Blows black smoke on acceleration
No start

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
Possible Solutions

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.

Nov 20, 2012 | Cars & Trucks

1 Answer

2002 impala 3.8L 180,000kms. Having problems with car hesitating on acceleration(not all the time). Had maf sensor & idle air control sensor replaced recently. Fuel filter, air filter,new plugs &...

it is possibly the throttle position sensor(tps) malfunctioning. basically the computer or "brain" of the car thinks the throttle is in a different position than it really is and automatically makes adjustments to fuel, air ect.... based on these false readings from the sensor thus causing the engine to react a little different when you expect to have power.

May 14, 2011 | 2002 Chevrolet Impala

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

2 Answers

Service engine soon light is on and engine revs to hihg rpm when sarted

check the position of the TPS sensor....that stands for throttle position sensor......if it moved , the reading to the computer will either be too high or too either case the service light will come on......this sensor is mounted close to the throttle cable at the intake is mounted with 2 screws or bolts.....sometimes those bolts work loose enough so that the sensor moves out of position and yes it will affect your RPM big time if the output of this sensor goes too high......a normal average reading should be between .4 to .6 volts.

Jul 16, 2010 | 2004 Mitsubishi Lancer

2 Answers

How to change a throttle position sensor on a 94 ford f150 5.0 4x4

How to Replace a Throttle Position Sensor
(DIY & Save up to $135.75 ) - Time: 2.1 hours

1. Throttle Position Sensor - $ 55.44

1. Scan Tool
2. Screwdriver
3. Multimeter

1. Locate the OBD data link connector (DLC). Refer to your owner’s manual for the specific location.
  • Tip: The OBD-I data link connector is usually located in the engine compartment near the battery or the fuse box. The OBD-II connector (post 1995 cars) is usually located beneath the instument panel next to the steering column.
2. Turn your key to the“ON” position. Do not start the engine.

3. Plug your scan tool into the OBD data link connector. Turn on the scan tool and select the appropriate steps to read the diagnostic trouble code (DTC).


Scanner plugged into OBD-II data link connector.
  • Tip: The OBD-II diagnostic trouble code (DTC) is a 5 character alphanumeric code. The first digit is a letter that indicates the component group, the second digit is OBD mandated or manufacturer specfic, the third digit is a subgroup, and the fourth and fifth digits define the component and basic problem.
  • 4. Locate the throttle position sensor.

  • Throttle position sensor

  • 5. Disconnect the electrical connector from the throttle position sensor.

  • Electrical connector removed
6. Test the resistance of the throttle position sensor (TPS) with a digital multi-meter. If the resistance is out of specifications, the TPS must be replaced.
  • 7. Remove the throttle position sensor.

  • d3a8007.jpg

    Removing sensor mounting screws

    8. Install the new throttle position sensor. Tighten the mounting screws and attach the electrical connector.
  • 9. Erase the diagnostic trouble code (DTC) with the scan tool using the“delete” or“erase” command. Road test your vehicle to see if the check engine light returns.

    Check engine light

  • Tip: If the check engine light returns, repeat the diagnostic process for additional DTCs or take your vehicle to a certified repair shop.
Direct OE replacement

Hope helped with this. Good luck (remember rated this help).

Nov 05, 2009 | Ford F-150 Cars & Trucks

1 Answer

Check engine light

Whenever your check engine light is on your vehicle is in a limp mode. So you may notice extra fuel consumption. But you can run it for sometime with this light on without issue.........TPS stands for throttle position sensor.It tells the computer how far the throttle butterfly valve is open in the air intake of your truck.
Hope this helps!

Jan 16, 2009 | 1999 Dodge Ram

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