The page http://www.megamanual.com/ms2/GM_DIS.htm says that in a 6-cylinder application, the evenly spaced notches coincide with TDC. The sync pulse notch coincide with 10° after TDC for the #1 cylinder.
However, the VR sensor signal diagram on the same page shows that the sync pulse comes after the TDC of the #6 cylinder.
Which is correct?
Sync pulse timing on GM DIS V6
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0). For tuning/troubleshooting questions, please attached a datalog and your MSQ file to your post.
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
Let me answer my own question, now that I have finally found the answer.
The numbers in the VR sensor signal diagram are not cylinder numbers, but they are simply numbers for the notches. The notch numbering starts from the notch following the sync pulse. However, cylinder #1 TDC is at the notch preceding the sync pulse, i.e. at notch #6. The following table shows how the notch and cylinder numbers correlate:
Notch Cylinder at TDC
1 -
2 2, 5
3 -
4 3, 6
5 -
6 1, 4
7 -
The numbers in the VR sensor signal diagram are not cylinder numbers, but they are simply numbers for the notches. The notch numbering starts from the notch following the sync pulse. However, cylinder #1 TDC is at the notch preceding the sync pulse, i.e. at notch #6. The following table shows how the notch and cylinder numbers correlate:
Notch Cylinder at TDC
1 -
2 2, 5
3 -
4 3, 6
5 -
6 1, 4
7 -