Question about 2001 Chrysler PT Cruiser

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MAP sensor is the MAp sensor on the pasenger side of the engine with three wires going to it , pluged into the air injection area and the wires going to a device in the midlle right in front of the fire wall

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If you look at the sensor it will have a vacuum hose to it and yes 3 wires, they are reference, ground and signal output Do not replace the sensor just because there is a code, that code means a problem with the system itself, it can be the sensor, the wiring the PCM, test first, replace parts only then, MAP sensors are expensive and it may no cure the problem.

Posted on Aug 04, 2008


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What does code PO108 mean on a 2001 Grand Cherokee

wow , you actually tried to look it up, a 1st time here.

the MAP is a baro sensor used to calculate fuel injection RATES.

if you have gross air leaks to the system the engine IDLE screams.

is it?

108 means the voltage is too high.

usually its unplugged, or bad sensor.

otential 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

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

and last. but before ECU.

low engine compression, is 1 more, causes , many

what i do is reseat the MAP sensor

i then make sure he vacuum port is not clogged. (both sides)

i then measure the output , keyon, and idle and gunning throttle.

any Voltmeter works here,

key on is 5v or near.

idle 1.8v

gun engine as the RPMs fall like a rock the volts tries to hit 0.5vdc.

very very easy to find with a voltmeter

if the meter agrees with vacuum gage, then the MAP is ok

and you have air leaks or low vacuum for (VAST reasons)


Aug 19, 2014 | 2001 Jeep Grand Cherokee

2 Answers

What color wires on MAF/IAT sensor for 2005 grand Cherokee limited

what job? which engine.? 3.7L SOHC, engine? or the 4.7 V8?
3.7 is just a 4. 7 with missing 2 cyl. (the engine plants in Detroit are side by side)
hacking ?(if true, i can prove it wont work what ever you are doing) ask why?)
or diagnosing them? sure can help,
the FSM book covers this, ever heard of the factory service manual. ??? aka. SM? but the Factory one is BEST !
the chapter 8 covers all this. ever inch of wires. covered.

the IAT has 2 wires, see it there, its obvious the colors.
the MAF, what maF? ) sure you meant MAP ok?)

2005 is a WK jeep,
the full manual is here

if you use the live data from the scan tool
you can see if either are reading wrong, did you?>

my guess is you meant air flow sensors in general.
there are 2 kinds, MAP and MAF
most jeeps run a MAP and not a MAF.!
if you knew how to test both you'd for sure know what is there.
In fact i always check this first. (speed density/air density systems are radically different)

there is no MAF.
the MAP measures Baro vacuum in the plenum
and the PCM has very complex tables that computer injection rates vacuum readings (air flow is calculated on this engine not measured directly with a MAF)
page 8w-30-11 and 30-16 cover both sensor wiring.

the map only measures vacuum (or in science, Baro pressure).
i have the baro to voltage reading chart for this sensor.
if you need it.
ah shucks , this guy has it...

some FSM its missing this very important chart.
grab it and keep it.

Jul 08, 2014 | 1997 Jeep Grand Cherokee

1 Answer

Can a bad map sensor cause mt 2004 sebring to keep stalling?

It easily can. The MAP sensor controls how much fuel goes in. If it decides that no air is going into the engine, it might just decide to put no fuel into the engine. You could attempt to get some MAP-safe air intake cleaner for fuel injection, to see if this helps, first.

Jun 27, 2011 | Chrysler Sebring Cars & Trucks

1 Answer

Hard to start running rich & stall

Sounds like a MAP inlet Manifold Absolute Pressure sensor fault. Symptoms of a faulty MAP

  • Poor starting/erratic idling/engine stall - with the MAP not sending the correct inlet air pressure signals to the ECU, incorrect fuel injection volumes then result. The imbalance in the fuel/air ratio often leads to rough engine performance and poor starting and stall. The engine might be kept running at start up by pumping the accelerator pedal
  • Sluggish performance/power ceiling - the engine may seem to perform normally in the lower rev range but will severely run out of power above about 3000 rpm
Poor fuel economy. The ECU tends to supply an over rich fuel mix to the engine in the absence of signal from the MAP resulting in very poor fuel economy. The reason for this is that if the MAP has no signal this ECU assumes 'no vacuum' = fully open throttle = engine is under load. To match this 'open throttle' signal the ECU increases the injection cycle to supply more fuel

How to Check? The MAP has three electrical pins, one for 12 volts (or 5 volts) reference, one for ground and the third (the middle one generally) is the 'signal' output. Put a voltmeter positive connector on the 'signal' pin of the connected socket (back probe by inserting a bit of wire). Apply suction to the vacuum input, even sucking on it with your mouth, should result in a measurable voltage output. At normal air pressure (open throttle) the voltage seen should be 0 volts. As vacuum is applied the voltage output should change to about 5 volts (throttle closed at idle). If no transition seen the MAP is faulty.

Feb 02, 2011 | Chrysler Sebring Cars & Trucks

1 Answer

I have this eobd code problem p0105 in my elantra, where those sensors?

P0105 - Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction
The MAP (Manifold Absolute Pressure) sensor is part of the fuel management system. It reacts to changes in engine manifold pressure. The PCM (Powertrain Control Module) monitors the MAP sensor continually to properly run the engine. Changes in engine load require changes in the amount of fuel injected, and timing of the ignition system, etc. An engine under load has more manifold pressure(or less vacuum) than an engine that is coasting. As the load changes, the MAP sensor voltage signal to the PCM changes accordingly. To check the MAP sensor operation, though, the PCM watches other sensors to verify that the MAP sensor is working properly.

For example, the PCM compares the TPS (Throttle Position Sensor) signal to the MAP signal to verify the MAP signal isn't "sticking". If the PCM doesn't see a MAP sensor change immediately follow a change in the throttle pedal sensor, it knows there is a problem with the MAP sensor and sets P0105. Or, if the PCM notices that the TPS indicates the engine is under load, but the MAP signal indicates that the engine is "coasting" it, again, knows there is a problem with the MAP sensor or TPS and sets P0105.

Symptoms of a P0105 check engine light code may include:
* Poor running engine
* Engine runs rich
* Engine won't idle
* Engine backfires through tailpipe
* Engine misfire under load or at idle
* MIL (Malfunction Indicator Lamp) illumination
* In some extreme cases there may be no symptoms other than MIL illumination

Causes: A P0105 DTC could be caused by:
* MAP sensor vacuum hose disconnected or plugged
* Bad MAP sensor
* Bad TPS
* Damaged or problematic MAP sensor connector
* Damaged or problematic TPS connector
* Damaged wiring
* Short to reference voltage on signal circuit of MAP sensor
* Loss of ground to MAP sensor or TPS
* Open on signal circuit of MAP sensor
* Bad PCM

Possible Solutions:
Using a scanner or code reader, turn the ignition on and engine OFF; what does the MAP sensor voltage read? It should be about 4 Volts for sea level. If you are at a higher altitude, it should decrease about half a volt or so for each 1,000 ft. of altitude (this will vary from model to model) Or if you have a separate MAF (Mass air flow) sensor on your vehicle, they are usually equipped with a Barometric pressure reading. If so, the Baro reading should match the MAP reading (they both measure ambient air pressure). If they're roughly equal, then, check for Freeze Frame data of the MAP sensor (if available).

NOTE: Freeze Frame data is the PCM recording a fault when it happens. It captures the readings of the various PIDS (parameter identifiers)available to troubleshoot what happened. It's like a recording of the problem as it happened. At idle a typical MAP sensor Voltage reading should be about a volt, and at WOT (wide open throttle) it should approach 4.5 to 5 Volts. As for the TPS, at idle, the voltage reading is about 1 Volt or less. As the throttle is opened the reading will increase to 4.5 Volts at WOT. Do the two readings make sense? For example, if the TPS reading on Freeze Frame data shows 2.5 Volts (indicating partial throttle) does the MAP sensor indicate a reading that isn't at either extreme? Using the Freeze Frame data (if available) compare the MAP reading to the TPS when the problem occurred. This can help you identify what happened

If you have no access to Freeze Frame data then check if the MAP sensor voltage changes when you apply vacuum to it. You can do this by mouth or a vacuum pump. The voltage should increase as you apply vacuum. If the reading doesn't change as you apply vacuum, make sure there are no obstructions in the hose to the sensor. If the hose is clear, the MAP sensor is usually bad, but it doesn't rule out the following from causing the problem: Does the MAP sensor appear to be stuck at less than .5 Volts? Then:

NOTE: This code shouldn't set if the MAP is stuck at extremely low voltage, however, I'm adding it in because there's no way to know for certain for which vehicles a low voltage condition may set a P0105.

1. Inspect the wiring harness and MAP sensor connector. Repair any damage
2. Unplug the MAP sensor connector. Also, at the PCM connector, remove the MAP sensor signal wire and check for continuity to the MAP sensor connector. If there is infinite resistance, then repair open in MAP signal circuit. If the signal wire has continuity to the MAP sensor connector, then check for 5 volt reference voltage to the connector and a good ground. If both are present, then re-install all removed wiring and replace the MAP sensor.

Does the MAP sensor appear to be stuck at full 4.5 voltage? Then:
1. Inspect the wiring harness for damage. Repair as needed
2. Remove the MAP sensor signal wire from the PCM connector. With a voltmeter measure the voltage with KEY ON ENGINE OFF. Is there 4.5 Volts? If so, unplug the MAP sensor and recheck. If it is still present, then repair short between the signal wire and 5 volt reference wire.
3. If unplugging the MAP sensor causes the voltage to disappear, check that the ground is intact. If it is, then replace the MAP sensor due to internal short.

MAP sensor codes include P0106, P0107, P0108 and P0109 .

Manifold Absolute Pressure (MAP) Sensor: The MAP sensor is located against the firewall to the left side of the engine.
Barometric Pressure Sensor: This sensor is installed on the VAF sensor; Volume Air Flow Sensor Is located in the air intake plenum assembly.

Hope this helps.

Jan 24, 2011 | 2001 Hyundai Elantra

1 Answer

Engine dieing,replaced MAP sensor because of code 73,didn't fix.Cat has 77'000 miles. Feels like it is starving for fuel. It is an intermittent problem.

map code can be triggered for a bunch of reasons maybe its telling the truth about vaccum and you have none take oxygen sensor out of exhaust if engine runs better then cat could be pluged if not then you could be up the wrong tree also three wires 0n map sensor as follows one wire must have 5 or8 or 12 volts with the key on but not runnig other one should have continuity to the same colored wire on the tps the other should run back to yuour computer test continuity one that wire to computer

Jan 10, 2010 | 1992 Cadillac DeVille

1 Answer

Codes reading 31 what is this, 95 geo lsi with 1.8 engine

A MAP sensor problem will cause the symptoms you are experiencing. The MAP sensor is critical because you have a speed density type fuel injection system. Without the MAP sensor signal or an inaccurate one, the ECM won't know the engine load for ignition timing and fuel injection adjustments. The engine computer is detecting a high voltage condition on the MAP sensor signal circuit.
Inspect the vacuum hose going to the MAP sensor. Replace it if is looks cracked or if it collapses on itself. Make sure that the MAP sensor has vacuum by disconnecting the hose from the sensor when the engine is running and feeling for vacuum.

If you have vacuum, you can check the MAP sensor and its circuits with a multimeter. There are three wires going to the sensor. I am not sure on the colors, but Yellow should have 5 V on it with the key on. Brown is ground and should read close to 0 ohms. Light Green with a Red stripe should have 5V on it with the key on. If you backprobe the MAP sensor connector with it plugged into the MAP sensor on the light green/red wire and apply vacuum to the sensor, the voltage should drop.

Jul 20, 2009 | 1995 Geo Prizm

1 Answer

Map sensor bad and can't find one

A manifold absolute pressure sensor (MAP) is one of the sensors used in an internal combustion engine's electronic control system. Engines that use a MAP sensor are typically fuel injected. The manifold absolute pressure sensor provides instantaneous manifold pressure information to the engine's electronic control unit (ECU). This is necessary to calculate air density and determine the engine's air mass flow rate, which in turn is used to calculate the appropriate fuel flow. (See stoichiometry.)
An engine control system that uses manifold absolute pressure to calculate air mass uses the speed-density method. Engine speed (RPM) and air temperature are also necessary to complete the speed-density calculation. Not all fuel-injected engines use a MAP sensor to infer mass air flow; some use a MAF (mass air flow) sensor. Several makes use the MAP sensor in OBD II applications to test the EGR valve for functionality. Most notably General Motors uses this approach.

Find one HERE at eBay and have it in 2 days or so...

Jan 09, 2009 | 2003 Dodge Stratus

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