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My 2005 mustang has it's engine light on. the code was p0108. i replaced the map air flow sensor and re set the battery and the engine light went off for a minute. i drove my car about a mile and the engine light came back on. i tested the code again and it's the same p0108 code. i have checked the pipe and everything around it and it looks fine. no cracks. although i have noticed the throttle is slow. could that be why it is still testing p0108?
Re: My 2005 mustang has it's engine light on. the code...
You now know that the MAP sensor was only being effected and was not the problem. Here are a few possible causes for the high signal transfer of the circuit:
Re: My 2005 mustang has it's engine light on. the code...
Tengo un mustang 06 mi problema es el codigo p0107y p0452 y ya le compre el maf y tambien el; map le cambie el fitro de la gas y las bujias y no mejora echa mucho humo ***** no quiere abanzar cual seria mi problema les agradesco que me saquen de la duda
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P0108
is the code for a problem with the MAP electrical circuit sensor having too high voltage input to the Engine Control Unit (ECU). This means that the voltage input to the ECU is too high and that it is not in the correct range for proper engine operation to work with inputs from the Mass Air Flow Sensor (MAF) and Throttle Position Switch (TPS). P0108 OBD II Trouble Code Manifold Air Pressure MAP Barometric Pressure...
P0108 - MAP (Manifold Absolute Pressure/Barometric Pressure) Circuit High Input The MAP (Manifold Absolute Pressure) sensor measures engine manifold negative air pressure. It's usually a three wire sensor: a ground wire, a 5 volt reference wire from the PCM (Powertrain Control Module) to the MAP sensor, and a signal wire that informs the PCM of the MAP sensor voltage reading as it changes. The higher the engine vacuum, the lower the voltage reading. The voltage should range between about 1 volt (at idle) to about 5 volts (WOT wide open throttle).
If the PCM sees the voltage reading from the MAP sensor is greater than 5 Volts, or if the voltage reading is higher than what the PCM considers normal under certain circumstances, a P0108 DTC will set.
Fault Code Definition The Manifold Absolute Pressure Sensor/Barometric Pressure Sensor measures the rise and fall of the air pressure inside the Intake Manifold. This provides critical data needed for the Power Train Control Module (PCM)
to control the Air Fuel Ratio, the Ignition Spark Timing, and many
components of the Emissions Control Systems. The Manifold Absolute
Pressure/Barometric Pressure Sensor converts the Intake Manifold air
pressure into a voltage that is high when the Intake Manifold air
pressure is high and low when the Intake Manifold air pressure drops to a
vacuum. The P0108 code indicates a high voltage input from the Manifold
Absolute Pressure Sensor/Barometric Pressure Sensor to the Power Train Control Module. Symptoms
In many cases, no abnormal symptoms may be noticed
In some cases, the engine may be hard starting and/or get poor fuel economy
In some cases, noticeably poor engine performance may occur
Common Problems That Trigger the P0108 Code
Manifold Absolute Pressure Sensor/Barometric Pressure Sensor is defective
Intake Manifold vacuum leaks
Faulty or corroded Manifold Absolute Pressure Sensor/Barometric Pressure wiring or connections
Common Misdiagnoses
Manifold Absolute Pressure Sensor/Barometric Pressure Sensor is replaced when the real cause is an Intake Manifold vacuum leak
Manifold Absolute Pressure Sensor/Barometric Pressure Sensor is replaced when the real cause is a stuck-open EGR Valve
Manifold Absolute Pressure Sensor/Barometric Pressure Sensor is replaced when the real problem is a defective Idle Air Control Motor, which causes a very low engine idle
P0108 - (Manifold Absolute Pressure/Barometric Pressure Circuit High Input The MAP (Manifold Absolute Pressure) sensor measures engine manifold negative air pressure. It's usually a three wire sensor: a ground wire, a 5 volt reference wire from the PCM (Powertrain Control Module) to the MAP sensor, and a signal wire that informs the PCM of the MAP sensor voltage reading as it changes. The higher the engine vacuum, the lower the voltage reading. The voltage should range between about 1 volt (at idle) to about 5 volts (WOT wide open throttle).
If the PCM sees the voltage reading from the MAP sensor is greater than 5 Volts, or if the voltage reading is higher than what the PCM considers normal under certain circumstances, a P0108 DTC will set.
Symptoms of a P0108 DTC code may include: * MIL (Malfunction Indicator Lamp) will likely be on * Engine may run poorly * Engine may not run at all * Fuel mileage may decrease * Presence of black smoke at exhaust
Potential causes of a P0108 code: * Bad MAP sensor * Leak in vacuum supply line to MAP sensor * Engine vacuum leak * Short on signal wire to PCM * Short on reference voltage wire from PCM * Open in ground circuit to MAP * Worn engine causing low vacuum
Possible Solutions: A good way to diagnose if the MAP sensor is to blame would be to compare the KOEO (key on engine off) MAP sensor reading on a scan tool with the Barometric pressure reading. They should be the same because they both measure atmospheric pressure.
If the MAP reading is greater than 0.5 volt off of the BARO reading, then replacing the MAP sensor would likely fix the problem. Otherwise, start the engine and observe the MAP reading at idle. It should normally be about 1.5 volts (varies according to altitude).
a. If it is, the problem is likely intermittent. Check all the vacuum hoses for damage and replace as necessary. You can also try wiggle testing the harness and connector to reproduce the problem. b. If the scan tool MAP reading is more than 4.5 volts, check the actual engine vacuum reading with the engine running. If it is less than 15 or 16 in. Hg, then the PCM is probably not seeing enough vacuum (due to a worn engine, perhaps) for a given operating condition (which causes a higher than normal voltage signal to the PCM) and setting the code. Repair the engine vacuum problem and retest. c. But, if the actual engine vacuum reading is 16 in. Hg or more, then unplug the MAP sensor. The scan tool MAP reading should indicate that there is no voltage present. Check that the ground from the PCM is intact and also that the MAP sensor connector and terminals are tight. If the connection is good, then replace the map sensor. d. However if, with KOEO, & the MAP sensor unplugged, the scan tool shows a voltage reading, then there may be a short in the harness to the MAP sensor. Turn the ignition off. At the PCM unplug connector and remove the MAP signal wire from the connector. Re-attach the PCM connector and see if with KOEO, the scan tool MAP reading shows voltage. If it still does, replace the PCM. If not, check for voltage on the signal wire you just removed from the PCM. If there is voltage on the signal wire, find the short in the harness and repair.
P0104 - Mass Air Flow (MAF) Circuit Intermittent Basically this means that there is a problem with the Mass Air Flow High (MAF) sensor or circuit. A more technical description would be that the MAF is producing incorrect air flow readings. Other MAF sensor circuit DTC trouble codes are P0100, P0101, P0102, and P0103.
Symptoms: You will likely not notice any serious drivability problems, although there may be symptoms such as a general decrease in power or sluggishness.
Causes: A code P0104 may mean that one or more of the following has happened: * The mass air flow (MAF) circuit is incomplete (broken / frayed wire, etc.) * There is an air leak in the intake system
Possible Solutions: The simplest thing to do is to reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures: * Verify that the Mass Air Flow Sensor wiring is connected properly and that there are no broken / frayed wires. * Inspect for any air leaks near the MAF sensor. * Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information) * Replace the MAF sensor.
P0102 - Mass Air Flow (MAF) Circuit Low Input Basically this means that there is a problem with the Mass Air Flow (MAF) sensor or circuit. A more technical description would be that the MAF circuit had lower than expected voltage (air flow). Other MAF sensor circuit DTC trouble codes are P0100, P0101, P0103, and P0104. Symptoms: You will likely not notice any serious drivability problems, although there may be symptoms such as a general decrease in power or sluggishness.
Causes: A code P0102 may mean that one or more of the following has happened: * The MAF may be disconnected, or a wiring connection may be bad * The MAF may be dirty or otherwise contaminated (Note: if you use a reusable oiled air filter, be careful not to apply too much oil or that can contaminate the MAF). * The MAF sensor may be faulty * The vehicle computer may be faulty (very rare)
Possible Solutions: The simplest thing to do is to reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures: * Verify that the Mass Air Flow Sensor wiring is connected properly and that there are no broken / frayed wires. * Inspect for any air leaks near the MAF sensor. * Take the MAF out and clean it using a spray cleaner such as brake cleaner or electrical contact cleaner. Be gentle with the sensor. * Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information) * Replace the MAF sensor.
P0101 - Mass Air Flow (MAF) Circuit Range/Performance Problem Basically this means that there is a problem with the Mass Air Flow (MAF) sensor or circuit. The PCM detects that the actual MAF sensor frequency signal is not within a predetermined range of the calculated MAF value for more than 4.0 seconds. Other MAF sensor circuit DTC trouble codes are P0100, P0102, P0103, and P0104.
Symptoms: You will likely not notice any serious drivability problems, although there may be symptoms.
Possible Solutions: The simplest thing to do is to reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures: * Inspect for the following conditions: An incorrectly routed harness--Inspect the harness of the MAF sensor in order to verify that it is not routed too close to the following components: - The secondary ignition wires or coils - Any solenoids - Any relays - Any motors * A low minimum air rate through the sensor bore may cause this DTC to set at idle or during deceleration. Inspect for any vacuum leaks downstream of the MAF sensor. * A wide open throttle (WOT) acceleration from a stop should cause the MAF sensor g/s display on the scan tool to increase rapidly. This increase should be from 6-12 g/s at idle to 230 g/s or more at the time of the 1-2 shift. If the increase is not observed, inspect for a restriction in the induction system or the exhaust system. * The barometric pressure (BARO) that is used in order to calculate the predicted MAF value is initially based on the MAP sensor at key ON. * When the engine is running the MAP sensor value is continually updated near WOT. A skewed MAP sensor will cause the calculated MAF value to be inaccurate. The value shown for the MAP sensor display varies with the altitude. With the ignition ON and the engine OFF, 103 kPa is the approximate value near sea level. This value will decrease by approximately 3 kPa for every 305 meters (1,000 feet) of altitude. * A high resistance on the ground circuit of the MAP sensor can cause this DTC to set. * Any loss of vacuum to the MAP sensor can cause this DTC to set.
If you suspect the condition may be related to aftermarket accessories, refer to Checking Aftermarket Accessories in Wiring Systems. Here as an aid in resolving your P0101 trouble code (DTC)...
Your map sensor, otherwise known as mass air flow sensor is probably bad. You should replace it. it is normally located between the air filter and the throttle body. It senses how much air is going into the throttle body so the car knows how much fuel to inject.
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