Lost connection with TAC??

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Jul 5, 2012 | 01:47 AM

rusty63ss

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From: Vancouver, WA

Lost connection with TAC??

I am using an '04 C5 LS1 as a standalone setup in my Nova. When I test fired my motor the DBW worked fine. Today when I tested the instrument cluster it was displaying "Reduced Engine Power" "Service Vehicle". I have 0 response from the TB when the pedal is depressed. My scanner is giving "U0107" Lost communication with TAC module. I checked all my connections to the TAC, PCM, TB, and pedal assembly I do not see anything wrong. What kinds of tests can I do to check the TAC? Is my TAC fried??

Thanks for your help.

Dhamen

Jul 5, 2012 | 12:40 PM

rusty63ss

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I did store my harness, PCM, TAC, and pedal assembly in a rubbermaid tote over the winter. I thought the TAC was a sealed unit. Could it have moisture in it causing my problem??

Jul 5, 2012 | 12:44 PM

lucky131969

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From: Dyer, IN

Quote:

Originally Posted by rusty63ss

I did store my harness, PCM, TAC, and pedal assembly in a rubbermaid tote over the winter. I thought the TAC was a sealed unit. Could it have moisture in it causing my problem??

Doubtful Dhamen. What have you verified with regards to wiring? Correct pinout? Power? Ground?

Jul 5, 2012 | 09:47 PM

rusty63ss

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Quote:

Originally Posted by lucky131969

Doubtful Dhamen. What have you verified with regards to wiring? Correct pinout? Power? Ground?

Either later tonight or tomorrow I am going to verify that my cobbled up temporary harness between the TAC and pedal does not have a disconnected wire. Then I will recheck all the connections at the PCM etc. When I test fired the engine the DBW worked flawlessly. It will be a year ago next month but it worked. It has to be something simple. I hope.

Jul 6, 2012 | 10:48 PM

rusty63ss

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From: Vancouver, WA

I found the issue. I'm such a DA. I forgot to hook up the ignition hot.:o

It works great now!

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