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  #13  
Old 12-20-2012, 10:51 AM
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Re: Mass airflow problem

Quote:
Originally Posted by artanas View Post
here the pic of the piece that was changed

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that is definitely a MAF sensor.

Is the vehicle operating (driving and performing) as normal with the check engine light on? I sometimes unplug my MAF sensor because the fuel economy goes up and the vehicle operates as normal with the MAF unplugged, the problem is that the check engine light comes on and the engine takes longer to warm up with the MAF unplugged. A check engine light message also disables the remote start and I think it disables the diesel particulate filter regeneration.

What exactly is the OBDII code you get now? P0101? I get a P0101 code when I unplug my MAF.
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  #14  
Old 01-03-2013, 09:09 PM
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Re: Mass airflow problem

bump, i really need to find the trouble on my jeep.

thanks.
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  #15  
Old 01-03-2013, 10:14 PM
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Re: Mass airflow problem

As I recall, there are 4 wires going to the maf sensor. Ground, +5 volts, maf wire (pwm signal), temperature wire (pwm signal). A short in any of these would cause a p0101. All of these are connected to the ecm module. Have all these wires been tested? I can confirm the wiring including the colors if it will help you.
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  #16  
Old 01-05-2013, 02:56 PM
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Re: Mass airflow problem

More details on troubleshooting the p0101 from the alldatadiy subscription

Diagnostic Test*

Section 1. DTC IS ACTIVE*
Ignition on, engine not running.
With the scan tool, clear DTCs in the Engine Control Module (ECM).
Start the engine and allow it to reach normal operating temperature.
With the scan tool, select View DTCs.
Is the status Active for this DTC?*




Yes*




Go To Section 2

Section 2. (K157) MASS AIR FLOW SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE

(refer to Section 2 picture)

Turn the ignition off.
Disconnect the Mass Air Flow Sensor harness connector.
Turn the ignition on.
Measure the voltage of the (K157) Mass Air Flow Sensor Signal circuit in the Mass Air Flow Sensor harness connector.
Is there any voltage present?

Yes

Repair the (K157) Mass Air Flow Sensor Signal circuit for a short to voltage.
Perform the ECM Verification Test Ver. 1. See: Verification Tests\Powertrain Verification Test
No

Go to Section 3

Section 3. (K957) MASS AIR FLOW SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE

(refer to Section 3 picture)

Measure the voltage of the (K957) Mass Air Flow Sensor Ground circuit in the Mass Air Flow Sensor harness connector.
Is there any voltage present?

Yes

Repair the (K957) Mass Air Flow Sensor Ground circuit for a short to voltage.
Perform the ECM Verification Test Ver. 1. See: Verification Tests\Powertrain Verification Test
No

Go to Section 4

Section 4. (F944) IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT OPEN OR HIGH RESISTANCE

(refer to Section 4 picture)

Using a 12 volt test light connected to ground, check the (F944) Ignition Switch Output (Run-Start) circuit in the Mass Air Flow Sensor harness connector.

NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.

Is the test light illuminated and bright?

Yes

Go to Section 5

No

Repair the (F944) Ignition Switch Output (Run-Start) circuit for an open circuit or high resistance.
Perform the ECM Verification Test Ver. 1. See: Verification Tests\Powertrain Verification Test

Section 5. (K157) MASS AIR FLOW SENSOR SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE

(refer to Section 5 picture)

Measure the resistance of the (K157) Mass Air Flow Sensor Signal circuit between the Mass Air Flow Sensor harness connector and the Engine Control Module (ECM) harness connector.
Is the resistance below 10.0 ohms?

Yes

Go to Section 6

No

Repair the (K157) Mass Air Flow Sensor Signal circuit for an open circuit or high resistance.
Perform the ECM Verification Test Ver. 1. See: Verification Tests\Powertrain Verification Test

Section 6. (K957) MASS AIR FLOW SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE

(refer to Section 6 picture)

Measure the resistance of the (K957) Mass Air Flow Sensor Ground circuit between the Mass Air Flow Sensor harness connector and the Engine Control Module (ECM) harness connector.
Is the resistance below 10.0 ohms?

Yes

Go to Section 7

No

Repair the (K957) Mass Air Flow Sensor Ground circuit for an open circuit or high resistance.
Perform the ECM Verification Test Ver. 1. See: Verification Tests\Powertrain Verification Test

Section 7. (K157) MASS AIR FLOW SENSOR SIGNAL CIRCUIT SHORTED TO GROUND

(refer to Section 7 picture)

Measure the resistance between ground and the (K157) Mass Air Flow Sensor Signal circuit in the Mass Air Flow Sensor harness connector.
Is the resistance above 10.0 ohms?

Yes

Go to Section 8

No

Repair the (K157) Mass Air Flow Sensor Signal circuit for a short to ground.
Perform the ECM Verification Test Ver. 1. See: Verification Tests\Powertrain Verification Test

Section 8. (K157) MASS AIR FLOW SENSOR SIGNAL CIRCUIT SHORTED TO THE (K957) MASS AIR FLOW SENSOR GROUND CIRCUIT

(refer to Section 8 picture)

Measure the resistance between the (K157) Mass Air Flow Sensor Signal circuit and the (K957) Mass Air Flow Sensor Ground circuit in the Mass Air Flow Sensor harness connector.
Is the resistance above 10.0 ohms?

Yes

Go to Section 9

No

Repair the (K157) Mass Air Flow Sensor Signal circuit for a short to the (K957) Mass Air Flow Sensor Ground circuit.
Perform the ECM Verification Test Ver. 1. See: Verification Tests\Powertrain Verification Test

Section 9. MASS AIR FLOW SENSOR
Turn the ignition off.
Connect the Engine Control Module (ECM) connector.
Replace the Mass Air Flow Sensor.
Turn the ignition on.
With the scan tool, Clear DTCs.
Start the engine and allow it to reach normal operating temperature.
With the scan tool, select View DTCs.
Is the status Active for this DTC?

Yes

Go to Section 10
No

Test Complete.
Perform the ECM Verification Test Ver. 1. See: Verification Tests\Powertrain Verification Test

Section 10. ENGINE CONTROL MODULE (ECM)
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Mass Air Flow Sensor and the Engine Control Module (ECM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
Look for the data to change or for the DTC to reset during the wiggle test.
Search for any Technical Service Bulletins that may apply.
Were any problems found?

Yes

Repair as necessary.
Perform the ECM Verification Test Ver. 1. See: Verification Tests
No

Replace the Engine Control Module (ECM).
Perform the ECM Verification Test Ver. 1. See: Verification Tests\Powertrain Verification Test
Attached Images
File Type: jpg section 2 maf picture.jpg (20.5 KB, 10 views)
File Type: jpg section 3 maf picture.jpg (20.9 KB, 8 views)
File Type: jpg section 4 maf picture.jpg (21.8 KB, 6 views)
File Type: jpg section 5 maf picture.jpg (48.4 KB, 6 views)
File Type: jpg section 6 maf picture.jpg (49.1 KB, 4 views)
File Type: jpg section 7 maf picture.jpg (21.5 KB, 4 views)
File Type: jpg section 8 maf picture.jpg (21.4 KB, 5 views)
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  #17  
Old 01-05-2013, 03:36 PM
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Re: Mass airflow problem

wow thanks a lot, im going to see my mecanic monday with this, thanks.
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  #18  
Old 01-06-2013, 01:20 PM
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Re: Mass airflow problem

Quote:
Originally Posted by artanas View Post
wow thanks a lot, im going to see my mecanic monday with this, thanks.
I created a pdf file for you of the information I posted. the pdf should display and print better than the information in this thread.
Attached Files
File Type: pdf p0101 diagnostics.pdf (613.2 KB, 18 views)
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  #19  
Old 01-11-2013, 01:16 PM
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Re: Mass airflow problem

it did not work when they plugged the computer the jeep had almost 20 error code, all gone when reseting. do you think its the computer of the jeep ?
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Old 01-11-2013, 02:17 PM
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Re: Mass airflow problem

Quote:
Originally Posted by artanas View Post
it did not work when they plugged the computer the jeep had almost 20 error code, all gone when reseting. do you think its the computer of the jeep ?
yikes!

you may need a new computer.
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  #21  
Old 01-22-2013, 07:04 PM
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Re: Mass airflow problem

the worst thing for me, its not under waranty after 3 years or 60000km, and not 5 years and 100000km. my jeep is at 95000km and under waranty until march.

im not 100% sure its the computer my problem, i cant buy one only to test and found its not the problem.

do you have any other idea for that problem ? im desperate
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  #22  
Old 01-23-2013, 10:10 AM
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Re: Mass airflow problem

I've given you all my information based on the materials I have access to. The tedious part of the diagnostics is testing each wire from the MAF sensor back to the computer. Did you actually take it to a dealership and get them to use the starscan to read the codes and provide you a print out? The starscan is better than any other scanning tool because it can read codes that other scanners cannot read so a dealer printout may give you more information.

If you did get the dealership to do the work so far, I would guess that the dealership would just replace the computer after following the same diagnostic procedure.

By the way, if your jeep runs fine, it just has a check engine light with a p0101 code, you could drive it that way for a long time. Certain features that are inherent in the diesel won't work though, like the remote start and diesel particulate filter regeneration. It would also fail an emissions test if you had to take one.

I'm not sure if used computers for the same make/model/year of your jeep are available at junk yards, but you could try that, usually the computer has to be programmed by the dealership after installing because your VIN and mileage have to be programmed in.
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  #23  
Old 01-30-2013, 10:48 PM
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Re: Mass airflow problem

other info here
P0101 error code - is that just for MAF? - Sprinter-Forum
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  #24  
Old 02-04-2013, 11:15 AM
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Re: Mass airflow problem

little update, i asked another dealer if the computer was under waranty and they said yes (8 years 160000km). so they tested another computer and after moving a little bit the cable of the computer, the check engine came back. he say its a cable problem, maybe in another cable, not a cable of the mass airflow.

but for now my jeep dont have the check engine... ill wait to see if it come back before to check all the cable of the jeep.

my first dealer is a liar, i wont go here anymore, and it cost me nothing for the computer test, ill go there now.
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