2006 TIPM AC Output Shorted - Dodge Cummins Diesel Forum
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post #1 of 18 (permalink) Old 05-19-2019, 12:14 PM Thread Starter
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2006 TIPM AC Output Shorted

2006 3500 Laramie 5.9L Cummins QC 4x4 48RE Auto 198K
Hey Guys, newbie first time posting. I have found allot of great information on this forum.
My fan clutch failed, which in turn caused my AC compressor fail. I replaced fan clutch and compressor and associated AC system components, then flushed and pulled vacuum. Started charging AC system and AC compressor Clutch would not engage. Found TIPM input to Compressor with zero current. After reading everything I could in this forum, I decided to take the truck to Dodge dealer to see if they could reflash TIPM and finish AC charge. When I came to pick up truck Service Manager told me TIPM AC circuit fried and traces were burnt black. The tech was able to recharge AC manually and said it was tight and no leaks. Service manager said TIPM is on back order and doesn't know when one will be available. He said Dorman is a good aftermarket replacement. I brought the truck home and removed TIPM and found the TIPM circuit board not burnt or blackened? Tech didn't remove this unit. Now I don't know if I should take it to another dealer for a TIPM reflash or just replace it? Is there a schematic available where I could at least verify if the circuit is shorted?
Your input would be greatly appreciated.
Thanks,
Dave

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post #2 of 18 (permalink) Old 05-19-2019, 06:18 PM
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I would try find local shop that works on Dodge with Cummins has DRBIII or equivalent scanner.
can try and look in local forums on here. https://www.cumminsforum.com/forum/chapter-forums/

Wiring info at https://redirect.viglink.com/?format...nditioning.pdf

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post #3 of 18 (permalink) Old 05-20-2019, 08:11 AM Thread Starter
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Thanks for the feedback.
Yesterday I measured ECM C2/10 input to TIPM Trigger Signal, ECM is to supply a ground to TIPM when the AC Console switch is illuminated and found it at 12.06vdc back probing the Light Blue/Orange conductor. I tried to cycle the AC switch light On/Off with key On, Blower Fan On, and then tried with engine running with same setup. No Change voltage was constant at 12.06vdc. I am going to see if there is local shop that has a DBIII scanner and see it can reflashed. If it is truly Shorted then I will replace TIPM. I bought this truck with 12,000 miles and have never had an issue with the TIPM, until now. I will post the results found.
Again thanks for input.
Dave
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post #4 of 18 (permalink) Old 05-20-2019, 11:11 AM
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Quote:
Originally Posted by Daves06Cummins View Post
Yesterday I measured ECM C2/10 input to TIPM Trigger Signal, ECM is to supply a ground to TIPM when the AC Console switch is illuminated and found it at 12.06vdc back probing the Light Blue/Orange conductor. I tried to cycle the AC switch light On/Off with key On, Blower Fan On, and then tried with engine running with same setup. No Change voltage was constant at 12.06vdc.
If it is truly Shorted then I will replace TIPM.
You verified the trigger signal with C2 connected to TIPM?

And it showed 12.06V with and without AC request from the HVAC control module.

It could either be the TIPM shorted internally at C2-10 or the ECM failed to send the trigger signal.

I would try to use a jumper to jump the LB/OR wire to ground to see if there is 12V output at C9-3 DB/YL wire and clutch engagement.
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post #5 of 18 (permalink) Old 05-20-2019, 11:21 AM
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Quote:
Originally Posted by Daves06Cummins View Post
My fan clutch failed, which in turn caused my AC compressor fail.

AC compressor Clutch would not engage. Found TIPM input to Compressor with zero current.
Usually a comp/clutch failure causes high current draw from TIPM and hence NO power output at C9-3 DB/YL wire when there is triggering grounding signal at C2-10 LB/OR wire.
And this is a common AC issue with the TIPM.
Its rare that the ECM fails to send the triggering signal.

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post #6 of 18 (permalink) Old 05-20-2019, 02:55 PM Thread Starter
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Thanks PWong,
After work today I will run a jumper to ground at C2/10. I didn’t expect to see 12v with the engine on or off with the connector installed?
I read about the ghost voltages when connectors are unplugged and disappear when reconnecting by going to ground.
I will post tonight the results.
Thanks again for your input.
Dave
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post #7 of 18 (permalink) Old 05-20-2019, 05:57 PM
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Use a test light instead of a voltmeter so you dont see ghost voltage.

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post #8 of 18 (permalink) Old 05-20-2019, 06:05 PM
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Quote:
Originally Posted by Daves06Cummins View Post
After work today I will run a jumper to ground at C2/10. I didn’t expect to see 12v with the engine on or off with the connector installed?
I read about the ghost voltages when connectors are unplugged and disappear when reconnecting by going to ground.
Troubleshoot with all connectors connected.

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post #9 of 18 (permalink) Old 05-20-2019, 07:07 PM Thread Starter
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I put the test light to C2/10 LB/OR wire by piercing the conductor insulation connector connected and it lit up.
Engine off or running. However with engine running, blower ON and AC light ON, test light not lit (Off).
So jumpering this wire to ground won't damage ECM?
Just want to be sure before doing so.
Dave

Last edited by Daves06Cummins; 05-20-2019 at 08:01 PM. Reason: Forgot to add engine status
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post #10 of 18 (permalink) Old 05-20-2019, 10:49 PM
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Quote:
Originally Posted by Daves06Cummins View Post
I put the test light to C2/10 LB/OR wire by piercing the conductor insulation connector connected and it lit up.
Engine off or running. However with engine running, blower ON and AC light ON, test light not lit (Off).
So jumpering this wire to ground won't damage ECM?
Just want to be sure before doing so.
Dave
How did you hook up the test light, to the battery negative post?
If yes, then the light should be on when there is no ac request.
And the light should be off when there is ac request.

So your ac request signal to TIPM is good.

After you send the ac request signal to TIPM you can verify the TIPM OUTPUT AT C9-3 with the test light.
There is no need to use a jumper since the request signal can be sent from the ECM.

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post #11 of 18 (permalink) Old 05-20-2019, 10:54 PM
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If there is no power output from TIPM then it needs to be reset or replace or do a relay bypass modification.

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post #12 of 18 (permalink) Old 05-22-2019, 07:39 PM Thread Starter
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Thanks for your input and support. I finally found a local shop that could do a reflash. They found 41 codes and TIPM was reset and AC Compressor came on and was cold!😃
However, two codes came back indicating the original fan clutch failure.

P0480 Cooling Fan 1 Control Circuit/Open
P0483 Cooling Fan Speed

Note on Report states Power to Fan - But not working, Engine Coolant Temperature 194F, Zero Fan Speed.
Tech had leave before I could speak to him. Note stated bring truck back for further diagnostics.
So Next step is to start tracing wiring for an open circuit?
I am open any suggestions.
Thank you all again for your help.

Dave
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