Testing the ignition 1 voltage supply circuit

JAMESB2019

MEMBER
2006 PONTIAC G6
3.9L
V6
2WD
AUTOMATIC
150,000 MILES

So, I have been having problems with this car as you may have known from my previous questions. Please look at the circuit attached below and tell me if what I am doing is right:

I managed (using needle probes) to insert one DMM lead at pin F of the Ignition Control Module Connector (F is the Pink/Black Ignition 1 Voltage wire circuit 5292)
and the other lead to contacts of fuse 3 in the junction block. With the fuse removed, the DMM probes inserted and touching the contacts and the battery and modules disconnected, I tested for continuity

I have no continuity at all. However, when the same procedure was done between Pins A, B, C, D and E of the Ignition Control Module Connector and Pins 17 (IC2), 1(IC1), 33(IC3) and 35 (Low Reference) at the connector C2 of the ECM and Ground G106 I did get continuity. I am wondering why Pin F to the contacts at Fuse 3 showed no continuity?

Image (Click to make bigger)

5 Replies

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Hi,

I looked at your pic above. That is a straight shot. You should have continuity. If you don't, check for a break in the wire, corrosion at the connections, a pushed-in pin at the connector, or damage to the fuse box.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-wiring

Let me know if you have other questions.

Take care,

Joe

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Friday, June 25th, 2021 AT 8:38 PM

JAMESB2019

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Update:

Thanks for your help, I was able to proceed with the electrical testing and resolution to the issues the G6 GTP had.

James

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Wednesday, July 7th, 2021 AT 9:47 AM

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Hi,

You are very welcome and thanks for letting me know. I'm glad to hear you got it fixed. By chance, could you let me know what caused the problem? I'm sure others will have the same type of issue and this will likely help them.

Take care and please feel free to come back anytime in the future if you have questions or need help. You are always welcome here.

Joe

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Wednesday, July 7th, 2021 AT 9:11 PM

JAMESB2019

MEMBER
42 POSTS

Yes Joe, I can explain. So, the G6 GTP had an ISS 717 code that wouldn't clear even after replacing the ISS myself. Eventually, I ended up splicing new AT C100 connector and TCM connector along with their wires. I also replaced the TCM with up to date reprogramming. The pink Ignition 1 voltage wire was shorter than the rest of them and after the splicing was done, I encased all the harnesses within new flex tubing but the splicing made them a bit too thick for the flex tubing. To make the story short, the ignition 1 wire (which as you may know runs all over the place) was severed and caused ignition 1 voltage circuit fault, transmission limp mode and misfire. After redoing the splicing, everything returned to normal. That is in a nutshell. I actually learned a great deal especially after testing every single circuit there is between the TCM, the C100 and the ECM. I even got to disassemble an enhanced 4T65E transmission valve body and also look at the reluctor ring that the ISS reads. Again, thanks for all that you do at 2CarPros. I am greatly thankful.

James

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Thursday, July 8th, 2021 AT 10:55 AM

JACOBANDNICKOLAS