[kewlbeans]

Hi all,

I’ve been chasing down some issues with some suspected blowby see Exhaust Brake, Black Smoke, Injectors, Blowby and Head...

While in the process of troubleshooting the truck finally threw MAP sensor code P0107 with P0073 Ambient Air Temp Sensor Circuit High. What I found is the common 5v power leg was shorting to ground. I started isolating the system and ruled out the TIPM and the wiring harness all the way back to the ECM. But as soon as I reconnect the ECM the short returns.

My question, is it safe to say that the ECM has a failed trace to ground? I want to make sure I’m not overlooking something before I just go drop the dough on a new ECM.

Thoughts?

 

[TCDiesel]

Unless you have access to WITech and can re-flash both the ECM and TIPM and reset the TIPM you can never rule out the ugly head of the TIPM.

 

[kewlbeans]

Unless you have access to WITech and can re-flash both the ECM and TIPM and reset the TIPM you can never rule out the ugly head of the TIPM.

@TCDiesel So I disconnected the TIPM from the circuit but till had the ground fault. I worked the circuit backwards leaving the TIPM disconnected to rule out each segment of the wiring harness checking continuity to ground. The ground fault clears when I unplug the ECM.

 

[TCDiesel]

How did you disconnect the TIPM, Power or removed all the Harnesses?

 

[kewlbeans]

How did you disconnect the TIPM, Power or removed all the Harnesses?

I removed just the common circuit (the D plug) to remove it from the circuit. Then I continued down the path toward the ECM from the Map Sensor.
Would you still suggest a re-flash for both ECM and TIPM?

 

[kewlbeans]

I removed just the common circuit (the D plug) to remove it from the circuit. Then I continued down the path toward the ECM from the Map Sensor.
Would you still suggest a re-flash for both ECM and TIPM?

I guess I removed the AAT from the mix with my previous comment which led me to ringing out the MAP circuit back to the ECM.

 

[TCDiesel]

Yes.... It requires someone that Know's the work arounds of TIPM/ECM, also just in case how many Keys do you have and is it the big key with lock unlock buttons.

 

[kewlbeans]

Yes.... It requires someone that Know's the work arounds of TIPM/ECM, also just in case how many Keys do you have and is it the big key with lock unlock buttons.

Gotcha, yeah I’m pretty versed in circuit analysis but smart enough to know it’s all FM!!…lol. Yes, I have the big head keys with the buttons on the key head. I believe I have 3 functioning keys.

 

[TCDiesel]

Great you have 3 Keys...If anyone reflashes the TIPM/ECM make sure all 3 work BEFORE the reflash. I won't even consider reflash 2006-07 on only one key.

 

[kewlbeans]

Great you have 3 Keys...If anyone reflashes the TIPM/ECM make sure all 3 work BEFORE the reflash. I won't even consider reflash 2006-07 on only one key.

Yeah, I’ve heard the horror stories!

So, if I disconnected the AAT circuit at the TIPM and removed the power source from the TIPM but still show continuity to ground between the MAP and ECM are you saying there’s still a path? Would I need to remove all cabling from the TIPM for a complete isolation? Trying to get the old girl back on the road. I live pretty remotely and don’t have easy access to shops.

 

[TCDiesel]

Yes........... and Be careful. I also you dia-electric on connections, Some are adamant about its use, I believe it's use far outweighs the downside.

 

[TCDiesel]

I also use the term TIPM Totally integrate power module, and I mean TOTALLY...Integrated.

 

[kewlbeans]

Yeah, I’ve heard the horror stories!

So, if I disconnected the AAT circuit at the TIPM and removed the power source from the TIPM but still show continuity to ground between the MAP and ECM are you saying there’s still a path? Would I need to remove all cabling from the TIPM for a complete isolation? Trying to get the old girl back on the road. I live pretty remotely and don’t have easy access to shops.

Guess I’m having a hard time fathoming a

Yes........... and Be careful. I also you dia-electric on connections, Some are adamant about its use, I believe it's use far outweighs the downside.

Got it! I too am a firm believer in the dielectric grease. I’m struggling with the thought that a re-flash would remedy a circuit shorting to ground. To my knowledge that has to be a physical issue…broken trace or something.

 

[kewlbeans]

I also use the term TIPM Totally integrate power module, and I mean TOTALLY...Integrated.

Got it…makes sense!

 

[kewlbeans]

Got it…makes sense!

I guess I could have some dirty plugs causing some tracking. That’s my only thought outside of a physical break that would cause power to ground.
Anyway, I’m going to head back out and poke at it some more. Thanks for the input.

 

[kewlbeans]

I guess I could have some dirty plugs causing some tracking. That’s my only thought outside of a physical break that would cause power to ground.
Anyway, I’m going to head back out and poke at it some more. Thanks for the input.

@TCDiesel Alright the TIPM is 100% disconnected and laying on my shop bench. Along the way I checked continuity to ground from Map Pin 4 to ground ECM connected batteries disconnected…I tested as I unplugged each plug on the TIPM from A to L until it hit the bench. Each step of the way I had continuity to ground. Finally after TIPM was out I tested resistance to ground and had 0.3 ohms. Pretty much a direct short to ground. I’m thinking my ECM is toast.

Would you differ?

Also, all my plug ports have been super clean…not seeing any signs of corrosion but still plan to grease everything on the way back in.

 

[TCDiesel]

If you have 5v input to sensor with secondary ground and no ground form ECM, just add additional (Temporary) ground to see if codes disappear for input back to ECM?

 

[cumminsturbofreak]

When you are talking 5v supply to the ambient sensor, are you checking 5v supply to Intake Sensor near air filter, or are you at the MAP sensor next to fuel rail???

Both of these sensors are supplied 5v from different circuits at ECM.

These sensors have absolutely NOTHING to do with TIPM.

 

[TCDiesel]

You would believe so..... But that TIPM is an integrated part of the electronic system of the vehicle.... I have lost count how many times people have had boost problems related to the electronic voltage supplied by that Is TIPM.... Or fan engagement etc. Wisdom would dictate it would have to be ruled out before you go drop a $1000 bucks on a component you don't need.

 

[cumminsturbofreak]

You would believe so..... But that TIPM is an integrated part of the electronic system of the vehicle.... I have lost count how many times people have had boost problems related to the electronic voltage supplied by that Is TIPM.... Or fan engagement etc. Wisdom would dictate it would have to be ruled out before you go drop a $1000 bucks on a component you don't need.

I understand your frustration with the electrical systems on these things, but it really has nothing to do with an engine air pressure sensor.