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Discussion Starter #1
ok did the egr delete but forgot to pull this sensor and got it with the torch a little where can i find one besides the dealer? they are on back order so they must be going bad mine has plenty of soot on it from the egr oh and its a 197 dollar sensor. theres 72 on order in the system trucks still under warranty but i don't want to spend a whole day putting it back to stock.
 

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Discussion Starter #2
ok maybe someone can tell me how to test this map or iat sensor the edge must be allowing the truck to run close to the right way. can it be tested with a voltage meter?
 

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If you cant get one from a dodge dealer, or from cummins, you could always search through a few junk yards, I am sure someone has wrecked one of these things by now...
 

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JR,

I am guessing the truck won't run??? What's it do? Or have you just not tried it yet hoping to be able to just buy a new sensor???
 

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Where is the MAP sensor located? I thought it was between the air filter and the turbo.
 

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i think the map is the sensor on the intake from the intercooler side pop the hood its on the right that big silver intake horn they call it
 

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Too many sensors on this engine...still learning which is which and what does what!
 

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Discussion Starter #8
the sensor the edge plugs into

it still runs just not as good as it did before seems like level 3 runs like level 1 . jeb can it be tested with a voltage/ohm meter?
 

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The sensor is on the air horn guys, its the one that is on the back side as it sits on the engine. Sort of hard to see as it sits in place. Feel around the back side of the air horn and closer to the air control valve. I have not found anything on what voltage or what ohms it would ohm out at if you was to check the sensor yet dude. I did find this which is maybe a better description of where it is on the airhorn. Might be worth a check on #5 of this list though as you could have burned the O-ring somewhat.




The combination, dual function Intake Manifold Air Temperature Sensor/MAP (IAT/MAP) (3) sensor is installed into the intake air connection manifold, below, and to the rear of the EGR valve (5).


1. Clean area around sensor.
2. Disconnect electrical connector (2) from IAT/MAP sensor.
3. Remove mounting screw (4).
4. Remove sensor from manifold.
5. Check condition of sensor O-ring.

I don't get to copy and paste the actual PIC that is with the manual guys sorry. If I run across the info on what it would ohm out at I will edit this again. I am sure it uses a 5 volt input of different amounts to get the info back to the ECM/PCM... What you might try on the pins from the sensor is find the two that you can ohm out and get on them with your VOM and then stick a piece of ice on the end of the sensor and see if the ohms change. If it does it could be fine dude. I will look more in the manual for better info on it!!!
 

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You might need to just take it out and clean it up good and remove the burned carbon off and around the end of it dude. I was just thinking about how you said you buned this a little with the torch and all. Unless you really got alot of heat on this all that damn carbon in the air horn dude would act as somewhat an insulator and shield the sensor to some degree of the heat. Even a direct hit with the flame will have the carbon get hot and glow redish and all but the actual fire doesn't always get to what is under all the carbon unless it flakes off while flamed and then the flame could get on the sensor.

I would pull this sensor out and clean it with carb cleaner and a tooth brush and scrub it up clean real easy and inspect it a little. Might just need a good cleaning and/or the O-ring
 

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Discussion Starter #11
thanks jeb i'll try some sensor spray cleaner. the o ring is fine nice snug fit
 

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JR,

Here is what I have found dude. Lots of reading


P2074-MAP/TPS CORRELATION - HIGH AIRFLOW/VACUUM LEAK DETECTED







For a complete wiring diagram Refer to Section 8W.

Theory of Operation


This DTC sets when an unexpected high intake manifold air flow condition exists that can lead to increased engine speed and puts the NGC into a High Air flow Protection limiting mode. The High Air flow Protection feature includes RPM limits for when a Throttle and/or MAP sensor limp-in fault is present.

When Monitored:
During all drive modes

Set Condition:
If vacuum drops below 1.5" Hg with engine RPM greater than 2000 RPM and closed throttle. One Trip Fault. Three good trips to turn off the MIL.


Possible Causes

VACUUM LEAK

RESISTANCE IN THE (F856) 5-VOLT SUPPLY CIRCUIT

(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

RESISTANCE IN THE (K1) MAP SIGNAL CIRCUIT

(K1) MAP SIGNAL CIRCUIT SHORTED TO GROUND

RESISTANCE IN THE (F855) 5-VOLT SUPPLY CIRCUIT

(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

RESISTANCE IN THE (K22) TP SENSOR NO.1 SIGNAL CIRCUIT

(K22) TP SENSOR NO.1 SIGNAL CIRCUIT SHORTED TO GROUND

RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT

MAP SENSOR

THROTTLE POSITION SENSOR

PCM



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Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).




Diagnostic Test
1. ACTIVE DTC
--------------------------------------------------------------------------------

NOTE: Diagnose any TP Sensor or MAP Sensor component DTCs before continuing.

NOTE: If the P0501 - No Vehicle Speed Signal is set long with this DTC, refer to the P0501 diagnostics before continuing.

NOTE: The throttle plate and linkage should be free from binding and carbon build up.

NOTE: Make sure the throttle plate is at the idle position.


Ignition on, engine not running.
With a scan tool, select View DTCs.

Is the DTC Active at this time?

Yes

Go To 2


No

Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

2. VACUUM LEAK
--------------------------------------------------------------------------------

NOTE: This code is enabled on engines with a plastic intake manifold and is intended to shut down the engine if a large crack occurs.

NOTE: A large vacuum leak is most likely the cause of this DTC.


Inspect the Intake Manifold for leaks and cracks.
Inspect the Power Brake Booster for any vacuum leaks.
Inspect the PCV system for proper operation and vacuum leaks.
Inspect the throttle plate to see if it is bent and will close entirely, if it is bent it may need to be replaced.
Inspect the MAP Sensor for proper installation.
Verify the engine is free from any mechanical failures.

Were any vacuum leaks found?

Yes

Repair the vacuum leak as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)


No

Go To 3

3. MAP SENSOR OPERATION
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Start the engine.
With a scan tool, monitor the MAP Sensor voltage.
Snap the throttle.

Does the MAP Sensor voltage vary from below 2.0 volts at idle to above 3.5 volts at wide open throttle?

Yes

Go To 4


No

Go To 11

4. TP SENSOR OPERATION
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Ignition on, engine not running.
With a scan tool, monitor the TP Sensor voltage while slowly pressing the throttle pedal from closed to wide open throttle.

Does voltage start at approximately 0.8 of a volt and go above 3.5 volts with a smooth transition?

Yes

Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)


No

Go To 5

5. EXCESSIVE RESISTANCE IN THE (F855) 5-VOLT SUPPLY CIRCUIT
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Turn the ignition off.
Disconnect the TP Sensor harness connector.
Disconnect the C2 PCM harness connector.

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.


Measure the resistance of the (F855) 5-volt Supply circuit from the TP Sensor harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?

Yes

Go To 6


No

Repair the excessive resistance in the (F855) 5-volt Supply circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

6. (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
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Measure the resistance between ground and (F855) 5-volt Supply circuit in the TP Sensor harness connector.

Is the resistance below 100 ohms?

Yes

Repair the short to ground in the (F855) 5-volt Supply circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)


No

Go To 7

7. THROTTLE POSITION SENSOR
--------------------------------------------------------------------------------





Connect the C2 PCM harness connector.
Ignition on, engine not running.
With a scan tool, monitor the TP Sensor voltage.
Connect a jumper wire between the (K22) TP Sensor No.1 Signal circuit and the (K900) Sensor ground circuit in the Sensor harness connector.

Does the TP Sensor voltage change from approximately 4.9 volts to below 0.5 of a volt with the jumper wire installed?

Yes

Replace the Throttle Position Sensor.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)


No

Go To 8
NOTE: Remove the jumper wire before continuing.


8. EXCESSIVE RESISTANCE IN THE (K22) TP NO.1 SIGNAL CIRCUIT
--------------------------------------------------------------------------------





Turn the ignition off.
Disconnect the C2 PCM harness connector.

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.


Measure the resistance of the (K22) TP Sensor No.1 Signal circuit from the TP Sensor harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?

Yes

Go To 9


No

Repair the excessive resistance in the (K22) TP Sensor No.1 Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

9. (K22) TP SENSOR NO.1 SIGNAL CIRCUIT SHORTED TO GROUND
--------------------------------------------------------------------------------





Measure the resistance between ground and the (K22) TP Sensor No.1 Signal circuit in the TP Sensor harness connector.

Is the resistance below 100 ohms?

Yes

Repair the short to ground in the (K22) TP Sensor No.1 Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)


No
Go To 10
10. EXCESSIVE RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT
--------------------------------------------------------------------------------




CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.


Measure the resistance of the (K900) Sensor ground circuit from the TP Sensor harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?

Yes

Go To 17


No

Repair the excessive resistance in the (K900) Sensor ground circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

11. EXCESSIVE RESISTANCE IN THE (F856) 5-VOLT SUPPLY CIRCUIT
--------------------------------------------------------------------------------





Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Disconnect the C1 PCM harness connector.

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.


Measure the resistance of the (F856) 5-volt Supply circuit from the MAP Sensor harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?

Yes

Go To 12


No

Repair the excessive resistance in the (F856) 5-volt Supply circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

12. (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
--------------------------------------------------------------------------------





Measure the resistance between ground and the (F856) 5-volt Supply circuit in the MAP Sensor harness connector.

Is the resistance above 100k ohms?

Yes

Go To 13


No

Repair the short to ground in the (F856) 5-volt Supply circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

13. MAP SENSOR
--------------------------------------------------------------------------------





Turn the ignition off.
Connect the C1 PCM harness connector.
Ignition on, engine not running.
With a scan tool, monitor the MAP Sensor voltage.
Connect a jumper wire between the (K1) MAP Signal circuit and the (K900) Sensor ground circuit.

Does the scan tool display MAP voltage from approximately 4.9 volts to below 0.5 of a volt with the jumper wire installed?

Yes

Replace the MAP Sensor.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)


No

Go To 14
NOTE: Remove the jumper wire before continuing.


14. EXCESSIVE RESISTANCE IN THE (K1) MAP SIGNAL CIRCUIT
--------------------------------------------------------------------------------





Turn the ignition off.
Disconnect the C2 PCM harness connector.

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.


Measure the resistance of the (K1) MAP Signal circuit from the MAP Sensor harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?

Yes

Go To 15


No

Repair the excessive resistance in the (K1) MAP Signal circuit
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

15. (K1) MAP SIGNAL CIRCUIT SHORTED TO GROUND
--------------------------------------------------------------------------------





Measure the resistance between ground and the (K1) MAP Signal circuit in the MAP Sensor harness connector.

Is the resistance below 100 ohms?

Yes

Repair the short to ground in the (K1) MAP Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)


No
Go To 16
16. EXCESSIVE RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT
--------------------------------------------------------------------------------




CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.


Measure the resistance of the (K900) Sensor ground circuit from the MAP Sensor harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?

Yes

Go To 17


No

Repair the excessive resistance in the (K900) Sensor ground circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

17. PCM
--------------------------------------------------------------------------------

NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.


Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes

Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)


No

Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
 
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