2G PTU

[gsXmitsu]

I was trying to test my PTU. I found luv2rallye's post on how to test it, but my PTU only has 7 pins as does my plug. My manuals don't even list a PTU for a 99 so I'm at a loss here, how do I test a 7 pin PTU that isn't listed for a 99?

 

[gsXmitsu]

does anyone know of another car that has a ptu that will work?

 

[luv2rallye]

Pin 5 of the stock 8 pin connector doesn't have a wire on it so maybe someone on your car replaced that connector with a 7 pin one for some reason.

Or more likely you really do have an 8 pin connector but because you only counted 7 wires/pins, you thought you have a 7 pin one. Connectors are named by the number of pin slots available whether there is a pin there or not. The pin numbering is then 1 through the highest pin slot number, in this case 8. This makes it easier to identify the pins especially when some identical connectors can have different pins missing. You also then always know what the highest pin number is.

Stock (2g) 8 pin connector wire colors:
pin 1: blue-black (output to fire cyl 2,3 coil's primary)
pin 2: brown-red (input from ECU to fire cyl 2,3)
pin 3: black (ground)
pin 4: white (tach output to ECU and gauge)
pin 5: unused
pin 6: larger black-white (+12V from ignition switch)
pin 7: black-blue (input from ECU to fire cyl 1,4)
pin 8: black-white (output to fire cyl 1,4 coil's primary but leaves coil as blue-red going to single pin "engine speed detection connector", then from there to pin 8 here as black-white)

 

[Moonlight GSX]

I know this thread is a bit old but I thought I might ask about pin 3, is this "sensor ground" or "battery ground?" I'm trying to configure this to a Series II EMS setup.

 

[luv2rallye]

Battery ground (engine ground).

 

[Moonlight GSX]

Awesome, just to clarify some things... when they say "sensor ground" this is to the ECU (according to the PDF on the EMS) and "cylinder head ground" is basically directly to the cylinder head. Now with the cylinder head ground, what would actually be the best place to put one? And do I need 4 separate grounds for the 4 coils I intend to run or can they be combined into one ground (smart coils - require a ground to head)?

 

[luv2rallye]

Read the "important note" here about sensor ground: http://www.dsmtuners.com/forums/articles-electrical-wiring/244376-oxygen-sensor-wiring.html. This sounds like where they want you to put your sensor ground.

Cylinder head ground would be any where on the head itself (not the block, manifolds, or body) that can be bolted on solidly. The 4 coils can each have their own ground or have one common ground with a larger wire (at least 14 gauge if common).

Note you still need battery negative going to both starter mounting bolt and body (separate cables each going directly to battery negative). Also a flexible flat braided wire going from body to intake manifold.

 

[Moonlight GSX]

I would assume that everything else here in AEM High Output Inductive Coils is wired (schematics) correctly?

 

[luv2rallye]

I'm not familiar with them to know. Also their wiring diagram is too blurry for me to see.