Question about 2002 Jeep Grand Cherokee

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2002 jeep map sensor problems

Not correct voltage at map sensor changed computer still not right voltage book says have ecm checked already changed

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Not exactly sure what you're describing. Incorrect voltage to or from Map sensor? Map sensors are very sensitive. I clean mine with a Map Sensor Spray cleaner every time I change the Air filter. Check to see if the fine, almost hair like wires in the Map sensor are broken...replace and/or clean if necessary. Best of luck resolving this problem.

Posted on Mar 31, 2014

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07 passat code p0642 related to other codes


code p0642 refers to ECM-knock control defective or sensor reference voltage A circuit low or system voltage- malfunction===causes for ecm is ECM--- for voltage A wiring is short to positive --- for system voltage ---wiring--poor connection--battery---alternator
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code p0106 refers to manifold absolute pressure MAP sensor/barometric pressure sensor-range/performance problem===causes--intake /exhaust leak--wiring--MAP sensor---Baro sensor.
code p0089 refers to fuel pressure regulator --performance problem===causes--fuel pressure regulator--mechanical fault. I would suggest that you have the battery load tested and the alternator checked for correct output as it may be the common reason for the codes .P0089 will not be electrical as it being a mechanical fault then the regulator needs replacing

Jul 23, 2013 | Cars & Trucks

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2001 chrysler pt cruiser code p1297


The code doesn't say anything it simply gives you a circuit in the electronics that has a problem. In you can the following should help understand that.

P1297 CHRYSLER - No Change In MAP Sensor Voltage xicon.jpghttp://engine-codes.com/p1297_chrysler.htmlForum CodePossible causes- MAP Sensor harness is open or shorted
- MAP Sensor circuit poor electrical connection
- Faulty MAP Sensor
- Faulty ECM

Jul 11, 2012 | 2002 Chrysler PT Cruiser

2 Answers

I have a jeep grand cherokee i have a code p1296. voltage missing at throttle position sensor.explanation engine running and the ecm detected map sensor voltage less than expected. probable cause open or...


I would change the TPS throttle position sensor and the Map/MAF are you sure its not the mass air flow?. I think your computer is fine it could be have a loose ground issues but computers dont go bad.

Sep 12, 2011 | 1997 Jeep Grand Cherokee

1 Answer

When i punch on the gass my 97 tahoe hesitates


usually a bad MAP sensor or TPS. I would test both. Let me know if you have questions and provide test results for repair advice.

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

May 30, 2011 | Chevrolet Tahoe Cars & Trucks

1 Answer

Blown fuse on ECMB in fuse block. No electricity getting to fuel pump. already changed out the relay. Is there a possiblilty of a bad PCM?


The ECM has likely failed. Perform the K-Test on the ECM:

The K-Test: Remove the MAP Sensor connector and turn the ignition switch to ON (Position II). Using a multimeter, check for 5 volts going between the MAP Sensor connector's reference wire (+) and ground. As you look at the connector, this is the socket on the right. Really press the black test lead into a cleaned main ECM ground on the thermostat housing. If the voltage is low, it's probably indicating ECM failure. Most failed ECMs will record a fraction of a volt. To me, the K-Test is simple, elegant, and accurate.

Oct 23, 2010 | 2002 Chevrolet Blazer

1 Answer

2002 Intrepid 2.7 motor just shuts off when stoping check engan light came on and code was a map sensor changed it still stoped running hade the light reset and it just came right back on this time...


check for vaccum leak at map sensor or anywhere else no vaccum to map will show up as bad because the computer watches the voltage on it and the vaccum changes that voltage , no vaccum meens no voltage change and computer throws the light on to let you know there's a problem somewhere.

Dec 27, 2009 | 2002 Dodge Intrepid

2 Answers

2003 Jeep Liberty Stalls


thats correct, may have bad ecm (computer) or bad wire to crank sensor from ecm, also ive run into this problem and it was the new sensor i put in was no good and aftermarket,also cam sensor can do this, and also make sure the 5 volt feed wire is good,good luck hope this helps.

Oct 13, 2009 | 2002 Jeep Liberty

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.

May 25, 2009 | 2001 Hyundai Elantra

1 Answer

Grand cherokee 1998, 4.0 L, throttle position sensor.


check computer ground in black and blue wire

Apr 07, 2009 | 1989 Jeep Wrangler

1 Answer

2005 jeep liberty diesel code # p0101 map- sensor out of range what is map


The MAP sensor (MANIFOLD ABSOLUTE PRESSURE) changes voltage or frequency as intake manifold pressure changes (air flow increases or decreases). The engine's computer uses the reading to advance or ****** engine timing. On older, non-fuel injected engines the vacuum advance on the distributor did basically the same thing.
The MAP sensor also works with other sensors on the Jeep engine, specifically the Throttle Position Sensor (on the throttle body) and Crank Position Sensor (on the transmission bell housing) to control other fuel flow and ignition timing functions.
If you're having problems with the MAP sensor, or are getting a Check Engine light and code for the MAP sensor keep in mind that other problems may cause that error code.
Bad vacuum hoses, vacuum leaks, bad EGR valves, intake manifold leaks, clogged air filter can all affect the MAP. sensor. To know for sure all the other sensors should be checked for correct voltage and perimeters
Also, if you have done any mods to the engine, especially intake, exhaust and ignition mods you may get an error code for the MAP or incorrect reading and a resulting loss in power or increased fuel usage.
The map sensor is easy to change with a couple screws off the Throttle body.. The part the air inters (the air breather). Buy one from the auto parts store if your sure that is the problem and just replace it..There is no adjustments to it...

It really sounds to me that you have a small vacuum leak in a line somewhere.You can try spraying the motor vacuum lines with soapy water with the vehicle running to find a leak. Also listen and feel under the dash for leaks and hissing sounds.
Hope this helps.......

Oct 31, 2008 | 2005 Jeep Liberty

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