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


MAP - Manifold Absolute air Pressure sensor

1.9) MAP- Manifold Absolute air Pressure (sensor)

What is it? The MAP sensor is a device tomeasure the relative air pressure drop in the inlet manifold, as compared toatmospheric air pressure, when the engine is running.

Where is it located? The MAP sensor is most frequently sited either remotely on the middle ofthe fire wall (bulkhead) at the back of the engine compartment, on the innerwing (fender), on the side of the air ducting or directly bolted on to theintake manifold plenum. A vacuum hosefrom the inlet manifold connects remotely located MAPs, but if sited on themanifold plenum there is a direct connection on its underside.

How does it work? When the engine is at idle the throttle plate is fully closed and thevacuum within the inlet manifold is at its greatest, 20 inches (~500mm) mercury.On older MAP designs, sealed bellows (as in a weather barometer) expand orcontract in response to pressure change and this moves an armature in or out ofan electrical coil. The voltage output fromthe coil reflects the position of the armature and therefore the air pressure.
Modern MAP sensors aresmall, membrane-mounted, solid-state, Piezo electronic, strain-gauge sensor devicesproviding the ECU with electrical signal corresponding to the absolute airpressure within the inlet manifold. The air pressure taken in conjunction withair temperature (IAT) provides the ECU with information on the overallmass of air taken in by the engine and it can therefore calculate theappropriate amount of fuel to inject, providing power whilst minimizingemissions. This device also helps adjustthe engine to accommodate pressure decrease with increase in altitude. In normally aspirated engines MAPs measureinlet pressure decrease in the inlet manifold relative to atmospheric pressure butin turbo charged engines MAPs are also capable of measuring the positive (over)pressure of air (boost) delivered to the inlet manifold from the turbo charger.

Symptoms of a faulty MAP
Associated OBD2 error codes DTCs: P0105 - P109; P0121, P0129; P0236 - P0238;P1296, P1297

  • 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 means 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 device has three electricalpins, one for 5 volts reference, one for 0 volts ground and the third (themiddle one generally) is the 'signal' output. Put a voltmeter positive connector on the 'signal' pin of the connectedsocket (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 0volts. As vacuum is applied the voltageoutput should change to about 5 volts (throttle closed at idle). If no transition seen the MAP is faulty.

How to Fix? Replace it

NEXT 1.10) IMR - Intake Manifold Runner valve

on Jul 22, 2011 | Mercedes-Benz E-Class Cars & Trucks

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

2 Answers

1999 dodge durango, goes through gas extremely fast. dont see a leak. what could be wrong?

When was last "healthy" tune up? Plugs, wires, all fluids & filters - especially fuel filter??? I'd start there and run a good fuel system cleaner through it and avoid cheap gas.

Mar 17, 2011 | 1999 Dodge Durango

2 Answers

Usually get 325 miles per tank on my 2000 RX300. Currently only getting 220 miles per tank. What could be the problem?

might be car age getting elder and coz of injector
or some time need service thing
like air filter to b change and spark pluge also fuel filter change need

Oct 07, 2010 | 2000 Lexus RX 300

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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