Question about 2002 Jeep Grand Cherokee

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2002jeep 4.7 dont have proper voltage at map sensor wiring good changed ecm still nothing

When checking for voltage put posative lead from meter on 1from harness &negative lead to good ground i have 5 volts but not from 1&3 on harness also have 2 jb power fuses drawing in pdc

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  • Jeep Master
  • 20,706 Answers

02 GC 4.7L V8. KEY ON< or RUNNING? we cant guess that.
why not post the symptoms, so we can REALLY HELP YOU.
GOT DTC's what are they,. scan it yet, if not?, why not scan it.?
my guess is you are working FSM free? none.?
MAP. (manifold air pressure or BARO) top front of intake plenum man.

2 fuses drawing, what does that mean?
all fuses draw current.
why not post symptoms, ???????????

the fsm shows the MAP readings and vacuum and voltage output
chart, the MAP is BARO SENSOR, CALLED A 1 BAR BARO.
in simple terms it measures plenum vacuum and the PCM injects
based on that and on IAT plenum air temperatures.
with 2 sensors this engine measure AIR flow through the system.


the PCM creates 5vdc called 5vREF. The PCM has a regulator inside
the PCM to creates 5v, for the 4 external sensors.
TPS, MAP, Crank and Cam sensors. all run off 5vdc power.

YOUR map has 3 pins,
1 blk /Lb is ground from PCM. (black, light blue?)
2- output color DG/RD (darkgreen-red) bingo, sensor output.
3- orange, 5vdc all time key on.

weather and altitude changes MAP readings. ask for the rules.

Baro means barometer.
its and electronic barometer. or Baro for short.

here is cheat sheet (HG is standard mechanics, vacuum tool called relative vacuum )
The voltage is inversely proportional to Vacuum. (relative)
HG " volts. (DMM backprobing conn.)
0 = 4.8v
5 = 3.9v
10 = 3.1v
15 = 2.1v
20 = 1.1v
up to
hard
vacuum
28"HG = 0.5 (radical deceleration, in gear, throttle cut, down hill)


http://troubleshootmyvehicle.com/chrysler/3.9L-5.2L-5.9L/how-to-test-the-map-sensor-2

do not use my numbers as verbatim, get your own FSM
and see the chart for your sensor on your engine.

keep in mind the ECU provides the ground to this sensor.
so measure ground on the sensor to the battery, minus.
should be less than 0.5vdc.
then measure 5v, on the 5vdc pin, yes, good.
then output,
this is the correct order, sensors can not run, with bad power.
period.

does engine run?
dose enigine pull (hand gauge) 20"HG it idle, if way lower, there can
be burned intake valves.. if the vacuum pulsed badly that too
is bad valves. the ECU can not run a bad engine., not that bad.
The ecu can only compensate for normal wear, not dead cylinders.

Posted on Mar 31, 2014

Testimonial: "that's all fine but i don't have any voltage in map wiring harness or coming out from ecm .scratch the fuse question. thanks for input,do u think it could be bad ground from junction box. jb power fuse 2nd 1 in from left on bottom has 12 volts on power side but no voltage or continuity on other side even with key on,is this the power fuse for ecm map sensor appreciate your time thanks"

  • 17 more comments 
  • cody hess
    cody hess Apr 16, 2014

    engine does run but u have to hold it the floor to get it started wont idle ecm not not reading map sensor fuel to rich loads up and fouls plugs,if u stay on thortle will stay running

  • cody hess
    cody hess Apr 16, 2014

    sorry forgot compresion,valves good

  • _-__-___-_
    _-__-___-_ Apr 16, 2014

    you do know, you never once stated the symtoms? just map quesitons, and we answered that in depth. now we have that, engine starts and floods, so we work that, not guess, at parts, ok? so you say "ecm not not reading map senso" so why not say how you know that, are you getting , scan DTC codes, and didnt post them, why not post those critcial facts, like P0106, 107 and 108, got them? one or all 3? , if the map is reading wrong, it can be , many reasons for that, do not jump to conclusions. use the Volt meter, it will not lie to you, key on, what is the voltage on all 3 pins of the MAP, with the voltmeter Black lead to the battery minus lug, you take a needle at the red lead end and back proble the MAP connector (do not disconnect it) and read the voltage there, this is not hard to do , its SOP , this backprobing on cars. it prevents damage to the connectors , doing other wrong things,,,

  • _-__-___-_
    _-__-___-_ Apr 16, 2014

    if the MAP orange wire is not at 5vdc, key on, we fix that first.

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    _-__-___-_ Apr 16, 2014

    see? why? because, that is MAP power. with no power, its DEAD. period.

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    _-__-___-_ Apr 16, 2014

    not only that, we make sure the vacuum is availble to the MAP.

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    _-__-___-_ Apr 16, 2014

    may a map are good, only the inport air port is packed with junk.

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    _-__-___-_ Apr 16, 2014

    oops 2, 4.7L SOHC or 4.7L DOHC, ? double or single cam.?

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    _-__-___-_ Apr 16, 2014

    here is your, SOHC map, see that blue 0-ring? is ring present and the port not packed with junk? see photo here on rockauto.

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    _-__-___-_ Apr 16, 2014

    http://www.rockauto.com/getimage/getimag...

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    _-__-___-_ Apr 16, 2014

    i don't have any voltage in map wiring harness

  • _-__-___-_
    _-__-___-_ Apr 16, 2014

    what does that mean, does that mean there is not 5vdc at the MAP power ping??????

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    _-__-___-_ Apr 16, 2014

    if yes, that means the wire is bad (connectors) or the PCM is bad. the PCM supplies power that runs the MAP, (and friends) if this pin is not 5vdc, we fix that first, how to do that is easy, unplug friends, is at 5vdc now, yes, friends are shorted to ground. no, then i measure 5vdc at the PCM with all sensors (friends) unplugged. 0v, at pcm, i cut the PCM wire at 5vdc pin (or retract the pin like the FSM shows) and find the PCM has 12vdc but the 5vdc refr, pin is dead, this means the PCM is bad. in fact this test the the first test at all PCM arrivals at Cardone , PCM repair company.

  • _-__-___-_
    _-__-___-_ Apr 16, 2014

    if you post the DTCs we can work that. why not post them.??????? the DTC errors?????? and the CEL glowing when it doese run...

  • _-__-___-_
    _-__-___-_ Apr 17, 2014

    here is my full flooding , text file , all ways, long and can not be edited here.

  • _-__-___-_
    _-__-___-_ Apr 17, 2014

    flooding? jeeps. (all 6 or more cylinder gas engines) near impossible to start or starts and flood stalls. (not ASD caused) Bad spark plugs! (not tuned up this decade?) sparks good, but all 4/6 or 8 are soaking in fuel ,yup , flooding? bad spark , coil bad, wires, cops, coil packs bad. or if wires layed wrong, someone set the firing order wrong or spun the dizzy time, willy-nilly.? one plug wet others dry, bad injector (leaking) 3 causes. ask. (do the FSM injector balance test, using a fuel pressure gauge, it\'s easy to do.) all plugs wet, fuel pressure on the moon, way over spec, the FSM tells you this spec, cranking and running spec. MAP sensor stuck low, or vacuum port plugged. ISC stuck closed. ( a desease on jeep 4.0L the ISC stepper loves to stick) IAC stuck closed. thermal idle air source if present. Fuel pressure regulator stuck closed causing insane high fuel pressure (ECU/PCM hates that) IF car starts and floods, and stalls did you forget to scan the PCM and see what DTCs were set? if not why not?. never work blind after 1995 ever. or go broke. 5.7L EGR stuck open? or any with EGR, many dont have one. Good engine , good spark all timed right, then the PCM is overfueling and may be leaking injectors or inputs to ECU are worn, (sensors fibbing) Does ECT read right? for ambient conditions before first start? Does IAT rear right? matching ECT just before first start, in morning or parked long time (they equalize parked) is the Map Voltage correct at key on, no start. about 0.5V? the 1v at idle? map info (aka MAT,old jeeps) the ground pin must be 0 to 0.5v at all times the +5vDC REF pin must be 4.75 to 5.25vdc at all times, key on, its POWER and NEVER changes, ever.. no power , to this pin, cause the MAP to go dead. period. output.: A general rule, is to subtact 0.1 volts for every 1000 feet about sea level. the keyon voltage is about 4 vdc, and as vacuum builds , the voltage drops. to as low as 0.5v my engine at idle pulls 19inches of HG vacuum. and is at 1.2vdc map output. if i gun the throttle , it drops rises 3.5v , if I decellerate in gear,(5 speed m/t) using violant compression braking with my engine, the vacuum goes way high. The voltage goes to near 0.5v ,(down shifted using the forward eneria of the car to spin the motor fast, with the throttle closed (max pumping loses, dig?) Your ECU injects fuel based on the MAP + IAT + ECT. The map is used to calculate the REAL AIR FLOW in to the engine, if it gets that correct the fueling is correct , if IAT and ECt dont lie) it goes without saying, the wires and connectors to all sensors (the whole EFI) must be good, not loose, broken, open, cut, or corroded. (no need to say it but there it is...) the map can be tested easy, backprobed, keyon, and a hand vacuum tool (at vac port) doing 3 or 4 readings, 0 HG, 10, 20, 28" HG, easy. it\'s not magic and must be linear, it must not jump as you pump it down, it must be a linear rises or the MAP sensor, is BAD. The sensor is Analog, pressure to voltage. Simple as they come. (no modulation, no CAN buss data, nada) On 1996 and newer USA cars we have OBD2 dirt cheap scanners, and we can watch the MAP change, keyon. in real time. as person 2 , pumps the hand vac. tool. just key on.!!! keep in mind pressure is the oposite of vacuum. (don\'t let charts fool you, above is all vacuum (using a standard USA tool box vacuum gauge). the data for above is from, alldata.com and the FSM already posted the PDF link to that.100 times. if the MAP voltage is not perfect the PCM closed loop corrects it, but not at wide open throttle if the MAP reads too low voltage at WOT, the engine will BOG (starve for fuel) if the MAP does not have 5vdc on its power pin the wires are shorted, open or PCM 5vdc supply is bad. We have a video covering that (1 hour long, ASE class, if you want) if the map ground pin is cut, the voltage at ecu is indeterminant (varies by year) but in each case the ECU/PCm reports this, and above fail, and goes to LIMPHOME Mode. Limphone is near flooding conditions. (super rich, and super retarded spark timing) now you have the full story. (i left out huge vacuum air leaks and bad engine and bad bouncing vacuum, due to i said motor is good) here is the graphic. my new 2008 FSM , has no graph, sad ,huh , it just says "if the scan tool vacuum does not match your hand vacuum gauge,keyon,idle or fast RPM, the MAP is bad. lazy bums..... here is the graph. Jeep map. http://www.fixkick.com/look/odds-ends/je... It can be bench tested with any 5vdc power supply, easy. Power supply, vacuum hand tool, and a volt meter. easy.

  • _-__-___-_
    _-__-___-_ Apr 17, 2014

    map, sensor graphic tells it all.

  • _-__-___-_
    _-__-___-_ Apr 17, 2014

    http://www.fixkick.com/look/odds-ends/je...

  • _-__-___-_
    _-__-___-_ Apr 17, 2014

    i can test any map, with my scan tool attached, and my map still connected, and pulled and my vacuum hand tool connected to the MAP, and test the MAP. like that. super easy, just key on, not running...... i tend to do things, live testing, as they say rubber meets the road.

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Testimonial: "I will check every fuse tomarrow, hope that works Cecil"

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Courtesy of a Beetle forum.

The camshaft position sensor is located at the front of the cylinder head under the timing belt cover. On 2.0L models, the camshaft position sensor is located behind the camshaft sprocket and is equipped with a pigtail lead and a remote connector. On 1.8L turbo models, the camshaft position sensor is located at the front of the intake camshaft. check the terminals in the connector and the wires leading to the sensor for looseness and breaks. Repair as required.

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Hi, I'm still having problems with my 1993 chev


Hi, these codes indicate both the MAP sensor and the EGR valve. You will need to troubleshoot a bit to see exactly what is wrong. It's possible a vacuum leak could cause both of these codes. I have pasted a procedure to check the MAP sensor below using a voltmeter. If you can run this test and tell me the results, it will help to diagnose the problem. You should also check all of the vacuum hoses, including the ones from the intake manifold to the EGR solenoid and from the solenoid to the EGR valve. The run some jumper wires from the battery to the EGR solenoid pins to see if the solenoid clicks open.

TESTINGSee Figures 3, 4 and 5
  1. Backprobe with a high impedance voltmeter at MAP sensor terminals A and C.
  2. With the key ON and engine off, the voltmeter reading should be approximately 5.0 volts.
  3. If the voltage is not as specified, either the wiring to the MAP sensor or the ECM may be faulty. Correct any wiring or ECM faults before continuing test.
  4. Backprobe with the high impotence voltmeter at MAP sensor terminals B and A.
  5. Verify that the sensor voltage is approximately 0.5 volts with the engine not running (at sea level).
  6. Record MAP sensor voltage with the key ON and engine off.
  7. Start the vehicle.
  8. Verify that the sensor voltage is greater than 1.5 volts (above the recorded reading) at idle.
  9. Verify that the sensor voltage increases to approximately 4.5. volts (above the recorded reading) at Wide Open Throttle (WOT).
  10. If the sensor voltage is as specified, the sensor is functioning properly.
  11. If the sensor voltage is not as specified, check the sensor and the sensor vacuum source for a leak or a restriction. If no leaks or restrictions are found, the sensor may be defective and should be replaced.

jturcotte_2322.gif

Fig. Fig. 3: Location of the MAP sensor-TBI system shown


jturcotte_2323.gif

Fig. Fig. 4: Probe the terminals of the MAP sensor to check for proper reference voltage

jturcotte_2324.gif

Fig. Fig. 5: Manifold Absolute Pressure (MAP) sensor wiring diagram



EGR solenoid:
jturcotte_628.jpg


EGR valve:
jturcotte_629.jpg

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Turn ON the ignition, with the engine OFF.
Disconnect the MAP sensor.
Connect a voltmeter between the MAP sensor 5-volt reference circuit and a good ground.
Measure for a proper range of 4.8-5.2 volts between the MAP sensor 5-volt reference circuit and a good ground.
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MAP Sensor TESTING
See Figures 3, 4 and 5
  1. Backprobe with a high impedance voltmeter at MAP sensor terminals A and C.
  2. With the key ON and engine off, the voltmeter reading should be approximately 5.0 volts.
  3. If the voltage is not as specified, either the wiring to the MAP sensor or the ECM may be faulty. Correct any wiring or ECM faults before continuing test.
  4. Backprobe with the high impotence voltmeter at MAP sensor terminals B and A.
  5. Verify that the sensor voltage is approximately 0.5 volts with the engine not running (at sea level).
  6. Record MAP sensor voltage with the key ON and engine off.
  7. Start the vehicle.
  8. Verify that the sensor voltage is greater than 1.5 volts (above the recorded reading) at idle.
  9. Verify that the sensor voltage increases to approximately 4.5. volts (above the recorded reading) at Wide Open Throttle (WOT).
  10. If the sensor voltage is as specified, the sensor is functioning properly.
  11. If the sensor voltage is not as specified, check the sensor and the sensor vacuum source for a leak or a restriction. If no leaks or restrictions are found, the sensor may be defective and should be replaced.



jturcotte_512.jpg

Fig. Fig. 3: Location of the MAP sensor-TBI system shown


jturcotte_513.jpg

Fig. Fig. 4: Probe the terminals of the MAP sensor to check for proper reference voltage


jturcotte_1792.gif

Fig. Fig. 5: Manifold Absolute Pressure (MAP) sensor wiring diagram








TPS TESTINGSee Figures 2, 3 and 4

  1. Backprobe with a high impedance voltmeter at TPS terminals A and B.
  2. With the key ON and engine off, the voltmeter reading should be approximately 5.0 volts.
  3. If the voltage is not as specified, either the wiring to the TPS or the ECM may be faulty. Correct any wiring or ECM faults before continuing test.
  4. Backprobe with a high impedance voltmeter at terminals C and B.
  5. With the key ON and engine off and the throttle closed, the TPS voltage should be approximately 0.5-1.2 volts.
  6. Verify that the TPS voltage increases or decreases smoothly as the throttle is opened or closed. Make sure to open and close the throttle very slowly in order to detect any abnormalities in the TPS voltage reading.
  7. If the sensor voltage is not as specified, replace the sensor.



jturcotte_514.jpg

Fig. Fig. 2: Using a DVOM, backprobe terminals A and B of the TPS sensor to check for proper reference voltage


jturcotte_515.jpg

Fig. Fig. 3: Using the DVOM, backprobe terminals C and B of the TPS sensor, open and close the throttle and make sure the voltage changes smoothly


jturcotte_1793.gif

Fig. Fig. 4: Throttle Position Sensor (TPS) wiring diagram

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Location of map sensor on my 1996 chevy k1500 truch vortex v8 5.0


The M.A.P. sensor is located on the upper intake manifold plenum. It has a plug with 3 wires connected to it, and a vacuum hose connected to it. to chek the sensor you'll need a volt meter. you can insert the positive lead into the backside of the terminal of the light green wire (with the plug still plugged into the sensor). Put the negative lead from the volt meter and ground it to a solid chassis ground. Turn the key to the on position (DO NOT START THE ENGINE). Your voltage should read 4.0 to 5.0 volts. Now start the engine. at idle your voltage should read 0.5 to 2.0 volts. If your volts read in those ranges your map sensor is good.

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1 Answer

IT IS NOT WORKING


Run this diagnostic
Test Procedures 
1. Check if DTC P0110 is set in addition to DTC P0105 or P0106. If DTC P0110 is set, go to next 
step. If DTC P0110 is not set, go to step 3 . 
2. Turn ignition off. Disconnect MAP sensor 4-pin connector. Measure resistance between ground 
and MAP sensor connector terminal No. 4 (Green wire). If resistance is one ohm or less, replace 
MAP sensor. If resistance is more than one ohm, repair open in Green wire between MAP sensor 
and ECM connector terminal No. 48. After repairs, clear DTC and verify MAP sensor operation. 
3. Turn ignition off. Disconnect MAP sensor 4-pin connector. Measure resistance between MAP 
sensor connector terminals No. 1 and 4 (component side). Resistance should be about 30,000 
ohms. If resistance is as specified, go to next step. If resistance is not as specified, replace MAP 
sensor. After repairs, clear DTC and verify MAP sensor operation. 
4. Turn ignition on. Measure voltage between ground and MAP sensor connector terminal No. 2 
(Red wire). Voltage should be about 5 volts. If voltage is as specified, go to next step. If voltage is 
not as specified, repair open in Red wire between ECM connector terminal no. 44 and MAP 
sensor connector terminal No. 2. After repairs, clear DTC and verify MAP sensor operation. 
5. Turn ignition off. Disconnect ECM 63-pin connector. Check for continuity between ground and 
MAP sensor connector terminal No. 1 (Green wire). If continuity does not exist, go to next step. If 
continuity exists, repair short to ground in Green wire between MAP sensor and ECM. After 
repairs, clear DTC and verify MAP sensor operation. 
6. Reconnect MAP sensor connector and ECM connector. Turn ignition on. Backprobe MAP sensor 
connector and measure voltage between ground and MAP sensor connector terminal No. 1 (Green 
wire). Voltage should be 0.2-4.5 volts. If voltage is as specified, go to next step. If voltage is not 
as specified, replace MAP sensor. After repairs, clear DTC and verify MAP sensor operation. 
7. Check ECM connector for loose or damaged terminals. If problem exists, repair ECM connector. 
If problem does not exist, replace MAP. Clear DTC and verify system operation. If problem still 
exists, replace ECM. After repairs, clear DTC and verify system operation.

Good luck and hope this helps. If the car does not start diconnect the MAP sensor to get you to the parts store if you need it to get you there.

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