VT V8 AUTO - PCM wiring

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VT V8 AUTO - PCM wiring

Postby JA2Z » Sun Aug 13, 2017 6:56 pm

Hi all,

What's E9? It's populated with a pink wire, so I'm assuming 12V+ of some kind?

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Re: VT V8 AUTO - PCM wiring

Postby JA2Z » Sun Aug 13, 2017 7:28 pm

Here's my conversion sheet I have made from all the wiring schematics and pinouts I could find for VT V8 Series 1 Autos and VS V8 Series 1 & 2 Autos:
VT V8 Auto conversion VS V8 Auto_JA2Z.xlsx
(15.4 KiB) Downloaded 5 times


If anyone knows what E9 is... let me know. BCM 12V+? Ign 12V+? I'm not sure at the moment.

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Re: VT V8 AUTO - PCM wiring

Postby antus » Sun Aug 13, 2017 7:38 pm

It is the ignition signal, it appears to be connected twice to A4 and E9.
Have you read the FAQ? For lots of information and links to significant threads see here: viewtopic.php?f=7&t=1396

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Re: VT V8 AUTO - PCM wiring

Postby JA2Z » Sun Aug 13, 2017 8:16 pm

Awesome thanks.

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Re: VT V8 AUTO - PCM wiring

Postby antus » Sun Aug 13, 2017 8:19 pm

Actually I should clarify, Im looking at kalmaker docs, A4 is marked "IGN" and E9 is "IGN:Feed" so your probably right in thinking it feeds out to something else like the BCM. Cant see any reference beyond that, though.
Have you read the FAQ? For lots of information and links to significant threads see here: viewtopic.php?f=7&t=1396

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Re: VT V8 AUTO - PCM wiring

Postby delcowizzid » Sun Aug 13, 2017 8:38 pm

E9 is switched ignition feed in on v6 attached to maf power canister purge as well fed from efi relay.ide feed it 12 ign these emus had 2 switched 12v feeds
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Re: VT V8 AUTO - PCM wiring

Postby JA2Z » Sun Aug 13, 2017 10:28 pm

sweet thanks :)

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Re: VT V8 AUTO - PCM wiring

Postby JA2Z » Sun Aug 13, 2017 10:35 pm

One more Question:... are all the Sensor GNDs linked, or are they isolated from each other in closed loops with each REF voltage?

TCT/IAT GND = ECT/TPS GND ?? etc... or no?

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Re: VT V8 AUTO - PCM wiring

Postby antus » Mon Aug 14, 2017 9:52 am

This is general information, im not that closely across the later model wiring but some are merged and some are split. Grounds that relate to only one signal are usually named with 'low' eg in 12P ref high and ref low, where low is the ground side. Other times its shared between a couple of sensors, in which case you'll just need to trace the wires and pin connections on the wiring diagram. This is why there are many grounds on the pcm. In practice they all end up wired together but its done this way to improve signal integrity.
Have you read the FAQ? For lots of information and links to significant threads see here: viewtopic.php?f=7&t=1396

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Re: VT V8 AUTO - PCM wiring

Postby JA2Z » Mon Aug 14, 2017 1:20 pm

Ok, thanks.

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