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Engine Harness & Emissions

11/08/2008


Grey 96. Can't pass emissions. Error in communications.
Where I live - No emissions = no plate renewal.

OBD II port is not functioning properly, suspect bad wire "Somewhere".

Won't "Talk" to either one of my X Cal programmers, but I can clear a
CEL with both of them. Can't read codes with the X Cal 3, but the X
Cal 2 WILL after a couple "error" results.
This is weird.

I can take the computer out of the car and put it into another 96 and
it works just fine, while putting a known working computer in the grey
car causes this loss of function. In short - I KNOW it's the car, not
the computer.

I've been through every fuse in both fuse boxes with no joy, so I
suspect the answer is change the wiring. I HAVE a parts car, with this
part of the loom intact, but I am NOT in the mood to rewire the damn
car & it's working very dependably. Frankly, with 8 cars, I don't HAVE
to.

Anybody seen this symptom before? Any bright ideas I haven't tried yet?

I'm going to piddle with it today a bit, and if I don't get what I
want to work, I'm seriously just going to sell the car to someone
outside of an emission control region.

FWIW - I might consider taking in a lower mileage cam failure and some
cash as a trade for this car - IF it's a 96/97.

--
Eric Lehmann
97 Ebony 42k Welded - With the Angels Now so that I don't have to be.
Long Live the Garage Queen !
97 Ebony 183k Resurrected, Welded, Experiment in progress
96 Medium Willow Green Metallic 119k Resurrected, Welded, Eaton M90 inside
96 Rosemist 72k 2006 Best Of SHO, Popular Vote, 2007 Best Gen 3, Welded
96 Charcoal Grey 135k - Resurrected, Welded
97 Pacific Green - Parting this one Out
____________________________________________________________________________

Eric:

Does the A/C work (specifically the clutch)?

If the harness has been changed on the engine and the car has a non-96 harness on the PCM, two of the pins are differnet in the big connector atop the tranny, one of them involves the data bus to the PCM, the other is for the A/C clutch.

Been there done that. If I hadn't skipped not being able to program the PCM and gone T/S'ing the lack of A/C I wouldn't have chased it back to that one pin. Once I started looking at it the problem became apparent as the A/C clutch wire is like 16 or 18 AWG and the wire out the other side of that big connector was clearly lighter wire. Right next to it was two pins with the opposite condition. Swapping those two pins cleared it all up.

Scott "Beaker" K
____________________________________________________________________________
The sound of experience or BTDT! Scott nails it!

I put a 96 car together with a 97 engine and engine wiring harness.

At least 2 wires in the large square plug on top of the transmission -
diagram name C130 - are inverted between years.
One wire is for the OBD II port, it is Tan and Orange. One wire is for
the AC Clutch, it is Black and Yellow.
If you did an engine and wire loom swap, and your AC won't turn on,
and you can't get a code reader to work properly, this is probably the
mod for you.

The 97 harness has the Tan/Orange on pin #5 and the Black/Yellow on pin #10.
The 96 has just the opposite - Tan/Orange on pin #10 and Black/Yellow on pin #5.

The plug on the body side can be easily changed. Leave the engine side
plug alone. There is a red plastic divider that must be pulled out to
allow pin keepers to be moved so you can get the pins to slide out.
After removing the divider, look closely into the plug where the pins
come through - you will see each pin has a little plastic 'arm' that
can be bent away to release the shaft of the pin. Then just push the
pin back.

Pins 5 and 10 need to be removed and switched around. The plug itself
has tiny numbers cast into it to indicate pin numbers.

--
Eric Lehmann
97 Ebony 42k Welded - With the Angels Now so that I don't have to be.
Long Live the Garage Queen !
97 Ebony 183k Resurrected, Welded, Experiment in progress
96 Medium Willow Green Metallic 119k Resurrected, Welded, Eaton M90 inside
96 Rosemist 72k 2006 Best Of SHO, Popular Vote, 2007 Best Gen 3, Welded
96 Charcoal Grey 135k - Resurrected, Welded
97 Pacific Green - Parting this one Out

Ed Note: And a great big Sailor Jerry Thanks goes out to Scott!


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