P0068 MAP/MAF - Throttle Position Correlation DTC (2022)

OBD-II Trouble Code Technical Description

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P0068 MAP/MAF - Throttle Position Correlation DTC (1)
Don Bowman
ASE Certified Automotive Tech

MAP/MAF - Throttle Position Correlation

What does that mean?

This diagnostic trouble code (DTC) is a generic powertrain code. It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may be slightly different depending on the model.

The generic trouble code P0068 refers to an engine management problem. A disparity exists between the computer's sensors as to the volume of air entering the intake manifold.

The PCM relies on three sensors to indicate air flow volume in order to calculate fuel and timing tactics. These sensors include the mass airflow sensor, throttle position sensor and the Manifold pressure (MAP) sensor. There are many sensors on the engine however these are the three associated with this code.

The mass airflow sensor is located between the air cleaner and the throttle body. Its job is to signal the amount of air passing through the throttle body. In order to accomplish this, a thin piece of resistance wire the thickness of a hair stretches across in the inlet of the sensor.

(Video) Corsa D 1.2 fault cod P0068 Map/Maf Throttle Position Correlation

The computer sends voltage to this wire to heat it to a predetermined temperature. As air volume increases it requires more voltage to maintain the temperature. Conversely, it requires less voltage as the air volume drops. The computer recognizes this voltage as an indication of air volume.

The throttle position sensor rests on the opposite side of the throttle plate in the throttle body. When closed, the throttle plate prevents airflow into the engine. Air necessary for idle bypasses the throttle valve by way of an idle air control motor.

Most later model vehicles use a throttle position sensor on the floorboards at the top of the gas pedal. As the pedal is depressed the sensor attached to the pedal sends a voltage to an electric motor that controls the opening of the throttle plate.

In operation, the throttle position sensor is nothing more than a rheostat. With the throttle plate closed at idle, the throttle position sensor registers very close to 0.5 volts and when opened as in accelerating, the voltage will rise to approximately 5 volts. The transition from 0.5 to 5 volts should be very smooth. The engine's computer recognizes this increase in voltage as a signal indicating the amount of airflow and rate of opening.

The Manifold Absolute Pressure (MAP) has a dual role in this scenario. It senses the manifold pressure corrected for air density due to temperature, humidity and altitude. It is also linked to the intake manifold through a hose. When the throttle suddenly opens the manifold pressure drops just as sudden and rises again as the air flow increases.

The engine management computer requires all three of these sensors to accurately strategize the length of time to open the injectors and how much spark advance is necessary to maintain a 14.5/1 fuel ratio. If, for some reason one of these sensors or a mechanical problem causes a disparity between the rest, the computer is incapable of making the proper adjustments and sets the P0068 trouble code.

(Video) What is P0068 Engine Code [Quick Guide]

Symptoms

The symptoms displayed for a P0068 code will depend on the cause of the overboost condition:

  • The service engine soon or check engine light will illuminate.
  • Rough running engine - the computer will set the above code and additional codes depicting the faulty sensor if the problem is electrical.Without the correct airflow the engine will develop a rough idle, and depending on the severity, it may not accelerate or have a serious dead spot off idle. In short, it will run lousy

Causes

Potential causes for this DTC include:

  • Vacuum leaks between the mass airflow sensor and intake manifold and loose or cracked hoses
  • Dirty air cleaner
  • Leak in the intake manifold or sections
  • Faulty sensor
  • Coked intake runner behind throttle body
  • Poor or corroded electrical connectors
  • Obstruction to air flow
  • Defective electronic throttle body
  • Obstruction in hose from intake manifold to MAP sensor

Diagnostic Steps & Possible Solutions

Like an auto technician, start with the most common problems. You will need a volt/ohmmeter, wire-piercing probe for the meter, a can of carburetor cleaner and a can of intake cleaner. Repair any problems as they are found and start the vehicle to determine if the problem is corrected -- if not continue the procedures.

With the engine off, open the hood and check the air cleaner element.

Look for any loose clamps or leaks in the piping from the mass airflow sensor to the throttle body.

Inspect all the vacuum lines on the intake manifold for obstructions, cracks or looseness which could cause loss of vacuum.

(Video) KIA CODE P0068 MANIFOLD ABSOLUTE PRESSURE SENSOR, MASS AIR FLOW SENSOR KIA FORTE RIO, OPTIMA, SOUL,

Disconnect each of the sensors and check the connector for corrosion and pushed out or bent pins.

Start the engine and use the carburetor cleaner to find any leaks in the intake manifold. A short shot of carburetor cleaner over a leak will change the engine rpm noticeably. Hold the can at arms length to keep the spray from contacting your eyes lest you learn the lesson much like picking up a cat by the tail. You won't forget next time. Spray all connection points on the manifold for leaks.

Take the clamp loose on the pipe connecting the mass airflow to the throttle body. Look in the throttle body to see if it's coated with coke -- a black greasy looking substance. If it is, pinch the tube from the intake cleaner bottle between the pipe and the throttle body. Push the pipe on the throttle body and start the engine. Begin the spray until the can is gone. Remove it and reconnect the pipe to the throttle body.

Test the mass airflow sensor. Pull the connector off the sensor. Turn the ignition on with the engine off. There are three wires, 12 volt power, sensor ground and signal (usually yellow.) use the red voltmeter lead to probe the connector for 12 volts. Keep the black lead on ground. No voltage is a ignition or wiring problem. Install the connector and check the sensor ground. It must be under 100 mv. If the sensor has 12 volts and out of range on the ground, replace the sensor. This is a basic test. If it passes yet when finished with all tests and the problem still persists, the mass airflow may still be bad. Have it checked on a graphing computer such as the Tech II.

Check the operation of the throttle position sensor. Make sure it is seated properly and the bolts are tight. It is a three-wire connector -- dark blue for the signal, grey for the 5 volt reference voltage and a black or orange for the PCM negative wire.

- Connect the voltmeter red lead to the blue signal wire and the black voltmeter lead to a ground. Turn the key on with the engine off. If the sensor is good it will have less than 1 volt with the throttle closed. As the throttle is advanced the voltage will rise smoothly to approximately 4 volts with no drop outs or glitches.

(Video) حساس MAF وحساس P0068 | MAP

Check the MAP sensor. Turn the key on and backprobe the power reference wire with the red voltmeter lead and the black to ground. With the key on and engine off it must have 4.5 to 5 volts. Start the engine. It must have 0.5 to 1.5 volts depending on altitude and temperature. Raise the engine rpm. The voltage must react to the throttle opening by dropping and rising again. If not replace it.

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Need more help with a p0068 code?

If you still need help regarding the P0068 trouble code, please postyour question in our FREE car repair forums.

NOTE: This information is presented for information purposes only.It is not intended as repair advice and we are not responsible for any actionsyou take on any vehicle. All information on this site is copyright protected.

FAQs

How do I fix error P0068? ›

Repairs that can fix the P0068 code would include: Adjusting the mounting or installation of the mass air flow sensor, manifold absolute pressure sensor, or throttle position sensor. Replacing the mass air flow sensor. Replacing the manifold absolute pressure sensor.

How serious is P0068 code? ›

What Does Code P0068 Mean? Repair Urgency: Fix this code immediately (same day if possible) to avoid engine and catalytic converter damage. Diagnosis: This trouble code can cause some pretty severe driveability concerns and may make the vehicle undrivable.

Is a map sensor the same as a throttle position sensor? ›

The TPS and MAP are indeed different sensors.

How much does a throttle position sensor cost? ›

The throttle position sensor cost ranges from around $40 and up, depending on your car. Find the right fit for your needs at AutoZone.

How do you reset the throttle position sensor? ›

The easiest way to reset your throttle position sensor is to unhook the negative cable from your battery for up to five minutes or to remove the fuse for your engine control module.

What is code P0068 mean? ›

Diagnostic trouble code (DTC) P0068 stands for “MAP/MAF – Throttle Position Correlation.” If the readings from one or more of these sensors contradict the data presented by the other devices, the vehicle's computer, aka the powertrain control module (PCM), logs the OBD-II trouble code P0068.

What is a throttle body and what does it do? ›

A throttle body is a butterfly valve located between the air intake filter and the intake manifold. It regulates how much air can go into the engine, based on driver input through the gas pedal. As more air flows into the engine, it injects more fuel, thus allowing for more power.

How do I fix code P0223? ›

What repairs can fix the P0223 code?
  1. Replacing the throttle position sensor.
  2. Replacing the Engine Control Module.
  3. Plugging in, repairing, or replacing wiring that is associated with the throttle position sensor.
  4. Repairing or replacing the throttle body.
  5. Realigning the throttle position sensor.

What causes a p0103 code? ›

The source of the problem is the sensor voltage output is higher than normal or required by the ECU to function with other sensor signals. The wiring or MAF sensor may be too close to higher voltage consumption components, alternators, ignition wires, etc. causing inaccurate output signals.

What should MAP sensor read at idle? ›

With the ignition on, the MAP sensor output should be around 5 volts. Start the engine and check the reading; at idle, the MAP sensor should read 1 to 2 volts. This indicates the MAP sensor is responding to changes in vacuum.

What happens if you unplug MAP sensor? ›

With the MAP sensor disconnected, the fuel delivery will be excessive and could cause harm to the engine and exhaust system (catalytic converters). Your vehicle getting on the freeway accelerating, bogging down, and reaccelerating sounds like fuel starvation. It could be a fuel pump fault or a plugged fuel filter.

How do you reset a MAP sensor? ›

Check the MAF sensor and clean it out with dry air. Then put it on and disconnect the battery for 12 minutes and hook it up. This will clear the computer to want to relearn itself. Then drive the vehicle and see what happens.

Can a throttle position sensor cause transmission problems? ›

The Throttle Position sensor measures the throttle position, which is controlled by the gas pedal. It is used to determine engine load and if it fails it can cause automatic transmission shifting problems.

How do you know if your throttle position sensor is bad? ›

Symptoms of a Bad or Failing Throttle Position Sensor
  1. Car won't accelerate, lacks power when accelerating, or accelerates itself.
  2. Engine won't idle smoothly, idles too slowly, or stalls.
  3. Car accelerates, but won't exceed a relatively low speed, or shift up.
12 Jan 2016

Can a dirty air filter cause throttle body problems? ›

Build ups of dirt and grime can cause airflow and pressure problems in the throttle body or the issue could be an incorrectly adjusted throttle stop, which is also part of the air intake system. Uneven airflow will cause pressure problems in the system, which again could lead to poor performance and acceleration.

How do I manually reset my throttle body? ›

Once you know that it is, you can reset the throttle position in your car.
...
What Is The Procedure?
  1. Step 1 – Disconnect the battery. ...
  2. Step 2 – Reconnect the battery. ...
  3. Step 3 – Turn the ignition switch to electric. ...
  4. Step 4 – Press the gas pedal down and fully release. ...
  5. Step 5 – Switch the key to the off position.

How do I reset my electronic throttle control manually? ›

Make sure that the accelerator pedal is fully released. Turn ignition switch “ON” and wait at least 2 seconds. Turn ignition switch “OFF” wait at least 10 seconds. Turn ignition switch “ON” and wait at least 2 seconds.

Does a throttle position sensor need to be calibrated? ›

Once you have fitted a Throttle Position Sensor, or TPS, you will need to calibrate it from within MEITE. First, be sure you have correctly wired, and assigned the throttle sensor signal input to "TPS Raw" in the Analog Settings.

Can a car run without a MAP sensor? ›

Your vehicle will not only run less efficiently without the readings from the MAP sensor, but its engine and catalytic converter may also wear out faster. To keep your ride running smoothly for as long as possible, you should avoid driving with a bad MAP sensor unless it's an emergency.

Where is the throttle sensor position located? ›

Unsourced material may be challenged and removed. A throttle position sensor (TPS) is a sensor used to monitor the air intake of an engine. The sensor is usually located on the butterfly spindle/shaft, so that it can directly monitor the position of the throttle.

What does engine code P0120 mean? ›

P0120 is the generic OBD-II code which indicates that the Engine Control Module (ECM) has seen the TPS sensor circuit A output voltage going below or above the sensor's expected range, or is chattering when compared to TPS sensor circuit B.

What are the two sensors on a throttle body? ›

Among the two most important parts within the throttle body are the throttle body position sensor (TPS) and the throttle body temperature sensor. While they sound similar, they are indeed two individual parts that work together to efficiently mix fuel and air.

Can a dirty throttle body cause reduced engine power? ›

Potential causes for reduced engine power include a bad throttle body, problems with the MAF and bad fuel pump, transmission failure, and more.

What is TPS sensor circuit B? ›

The “B” in this code's definition refers to a specific sensor or circuit. The throttle position sensor (TPS) is a potentiometer that's mounted on the throttle body. Meanwhile, the pedal position switch/sensor is mounted on the accelerator pedal.

How much does it cost to fix code P2135? ›

How much will it cost to fix? Because there are multiple possible causes of this engine code, the repair cost will really vary depending on the problem. The diagnostic test will probably take one hour, so the labor costs will likely be between $70 and $150, depending on the repair shop's labor rates.

How do I fix error code P2122? ›

What repairs can fix the P2122 code?
  1. Replacing or repositioning a ground wire.
  2. Replacing the wiring and/or connectors in the CAN bus harness or throttle actuator motor.
  3. Replacing the throttle position sensor, the throttle actuator control motor, the throttle position actuator, or the pedal position sensor.

What does a high circuit mean? ›

Diagnostic trouble code (DTC) P0463 stands for “Fuel Level Sensor “A” Circuit High.” It means that there is an unusually high voltage signal coming from your vehicle's fuel sensor. The result is that the fuel gauge will not read accurately.

What causes mass or volume airflow circuit? ›

The mass airflow (MAF) sensor is a device that is mounted on the air intake. Its job is to measure the density and, therefore, the volume of filtered air that is drawn into the engine. When the PCM perceives the sensor or its circuit is malfunctioning, OBD-II code P0101 is triggered.

What is P0102 engine code? ›

P0102 is the general code for a problem with the Mass Airflow (MAF) Sensor having a low voltage output to the Engine Control Unit (ECU).

What is normal MAP pressure at idle? ›

With the engine not running and the key on, the MAP sensor should read around 28-inHg. When the engine is started and idling, the vacuum of the engine should reduce atmospheric barometric pressure by 20-inHg. The reading on the scan tool scan tool should be approximately 8- to 9-inHg.

How do I know if my MAP sensor is working? ›

What to look out for in a failing MAP sensor
  1. Rich air-fuel ratio: Look for rough idle, poor fuel economy, slow acceleration and a strong smell of gasoline (especially at idle)
  2. Lean air-fuel ratio: Look for surging, stalling, lack of power, hesitation on acceleration, backfiring through the intake, and overheating.

Do you have to calibrate a MAP sensor? ›

If you're using a MAP sensor, then it should be calibrated. Most MAP sensors include a data sheet, that illustrate their voltage output based on the pressure they are exposed to.

Why does my car run better when I disconnect the MAF sensor? ›

In case the mass air flow sensor is faulty, it gives inaccurate readings to the computer. This impacts the fuel and air ratio in the engine, which ultimately affects the vehicle's performance. In such cases, when the mass air flow sensor is unplugged, the computer no longer receives the erroneous readings.

What problems can a MAP sensor cause? ›

As the MAP sensor fails, it can cause various issues with the fuel system and vehicle performance. An inaccurate reading from the sensor will cause the computer to change the amount of fuel it sends, which can rob the engine of power or cause it to run poorly.

Does the MAP sensor affect idle? ›

Stalling or Rough Idle

If your air-fuel mixture is too rich or too lean caused by a faulty MAP sensor, you may notice problems at the engine's idle. When the engine is running at idle, it is very sensitive, and therefore you may first notice a faulty air-fuel mixture at idle.

Do you have to reset after changing MAF sensor? ›

Conclusion. To sum up, resetting the car battery is what to do after replacing mass air flow sensor first.

Should I disconnect battery when changing MAP sensor? ›

To remove the old sensor, first disconnect the negative battery cable. This will ensure that the car is not damaged when the sensor is removed, and will also reset the vehicle's computer and trouble codes.

How do I reset my MAF sensor after cleaning? ›

There are about two main ways to reset the MAF sensor. You either disconnect the mass air-fuel sensor harness, or you disconnect the car battery. Whichever method you choose to use in carrying out a mass airflow sensor reset, you will only spend 12 to 15 minutes at most.

Where is the throttle sensor position located? ›

Unsourced material may be challenged and removed. A throttle position sensor (TPS) is a sensor used to monitor the air intake of an engine. The sensor is usually located on the butterfly spindle/shaft, so that it can directly monitor the position of the throttle.

How do I fix error code P1101? ›

How to Fix the Code P1101 Easily?
  1. Change the misfiring, missing, or loose connectors, wirings, or other components within the MAF sensor harness.
  2. Cleaning or replacing a clogged air filter can reverse code P1101.
  3. Scrubbing the filter may damage the wire to break or the plate.

What causes a p0103 code? ›

The source of the problem is the sensor voltage output is higher than normal or required by the ECU to function with other sensor signals. The wiring or MAF sensor may be too close to higher voltage consumption components, alternators, ignition wires, etc. causing inaccurate output signals.

What causes P0102 code? ›

A P0102 error code means that there's insufficient air traveling through your air filter. Most sensors aren't able to measure the exact airflow, but take a small portion of the intake air and use a calculation to arrive at the total volume and density.

What happens when you unplug throttle position sensor? ›

Deteriorating fuel economy: With an unplugged throttle position sensor, the ECU cannot adequately regulate the fuel amount it sends into the engine. In turn, your fuel usage might not be as economical as advertised because the engine might be using more fuel than it requires.

What problems can a throttle position sensor cause? ›

Your engine might stall, idle slowly or misfire when your car is stopped. The car might accelerate itself, hesitate to accelerate, or lack power when you are trying to accelerate. You may also experience difficulty in changing gears.

What should throttle position be at idle? ›

At idle is should be zero or a couple of degrees. Press down on the gas pedal very S-L-O-W-L-Y until the throttle is all the way open. ... If the TPS has a worn spot, most likely it will be between 0 and 20 percent throttle opening.

How do I reset my mass airflow sensor? ›

Resetting the Mass Air Flow Sensor by Disconnecting the Battery
  1. Remove the old MAF sensor and replace it with a new one.
  2. Before you connect the sensor with its harness, disconnect the battery from the ground cable.
  3. Leave it like that for around 10 minutes.
  4. The whole system will be reset now.

Can you drive with P1101 code? ›

While the P1101 code won't cause physical impairments to your vehicle which would prevent you from operating it normally, driving for prolonged periods is still not recommended. This is because the P1101 issue can lead to rich running conditions in which your vehicle is consuming more fuel than usual.

Can you drive car with P1101 code? ›

While a P1101 trouble code usually does not prevent the operation of a vehicle, it can cause the engine to run roughly, lose power, and even consume more fuel. This code should be repaired as soon as possible, because prolonged driving with this code stored can lead to internal engine problems.

How do I fix code p0103? ›

How to Fix P0103 Engine Code in 2 Minutes [1 DIY Method / Only $9.53]

What does a high circuit mean? ›

Diagnostic trouble code (DTC) P0463 stands for “Fuel Level Sensor “A” Circuit High.” It means that there is an unusually high voltage signal coming from your vehicle's fuel sensor. The result is that the fuel gauge will not read accurately.

What causes mass or volume airflow circuit? ›

The mass airflow (MAF) sensor is a device that is mounted on the air intake. Its job is to measure the density and, therefore, the volume of filtered air that is drawn into the engine. When the PCM perceives the sensor or its circuit is malfunctioning, OBD-II code P0101 is triggered.

What causes low voltage to a mass air flow sensor? ›

The MAF Sensor has low voltage output problems which may have several causes. The source of the problem is the sensor range voltage is lower than normal or required by the ECU to function properly. The most obvious problem is restricted airflow from the air cleaner to the MAF sensor which can be a clogged air filter.

Is there a MAF sensor fuse? ›

According to bently repair manuel, there is no fuse for MAF sensor.

Can a vacuum leak cause P0102? ›

Vacuum leaks and intake leaks in areas after the MAF can cause a discrepancy between what the MAF sensor is reading and the actual amount of air that is entering the engine. This can often trigger the P0102 code.

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