have a complete 88 tpi setup thatll eventually go on a 350. what are the two connectors on the ecu end of the harness that dont go into the ecu..theres a rectangular multi-pin connecter thats clear/white in color and a square multipin thats grey in color. what do these go to? ill post pics tommorow if you have no idea what im talking about.

 

As best I recall ... I assume 1988 is the same as 1986, but best to check the wiring diagrams.

1986 config:

Connector referred to as "S207" (Clear, 2 rows)
A - Brown - ALDL "C" Air select valuve control (diagnostic)
B - ? - ALDL "G" Fuel pump relay control (diagnositic)
C - brown/white - Service Engine Soon light
D - tan/white - fuel pump power
E - white/black - ALDL "B" connector
F - pink/black - IGN power (hot in run)
G - pink/black - hot in run
H - tan/black - ALDL "F" - TCC control
I - DOES NOT EXIST
J - orange - ALDL "E"
K - brown - Vehicle speed sensor (VSS) 2000 pulse req.
L - blank
M - black/white - ground??
N - orange/black - park/netrual switch
O - DOES NOT EXIST
P - purple - brake pedal open switch
R - purple - cold start solenoid (hot in START only)

Connector referred to C221 (black rectancle one, 2 rows of 3 wires. only 3 used)
A - pink black - cylinders 2,4,6,8 injectors power
B - blank
C - brown/white - fan relay power
D - pink/black - cylinder 1,3,5,7 injectors power
E - blank
F - blank

1989 Config changes

S207
B - pink/black - fuel injector bank 1 power
D - brown/white - electric fans
G - pink/black - fule injector bank 2 power
R - not used or gear selector switch

C221 - does not exist.


Mark.

 

the best place for wiring problems that i have forund is http://www.chevythunder.com/
hope this helps

 

*edit* thanks for the website, extremely helpfull

 

no problem now if i could just get my car running

 

There's a reason I bought a 1986 Camaro service manual when I swapped 1986 Camaro TPI into my car.

 

I know this is old, but perhaps someone can help me out here (I'm a little confused)

I'm swapping the engine harness from an '89 TPI into a '87 LG4 car...and I cannot find the C221 connector on the engine harness. If I read your last statement correctly, in '89 it didn't exist...so since I'm using John Millican's diagram which refers to making the connection to the C221 - what do I do?



Thanks.

 

My notes were from GM's books (Helm Inc.). In 1989, there isn't a C221 connectors. In 1986-1988 there was.

From your computer, there should be a bulk of wires going to the engine bay and then a smaller batch going to the right side of the car. In 1986-1988 there was two connectors ... a large double row and a small black rectangle (C221). In 1989, C221 disappeared and the wires were in the large doublerow (IE. cold start was gone, so one spare wire in the harness).

Best bet is to read the diagrams for your year of car.

MArk.

 

Well, I have the factory manual from '87 - but not the one from the donor car which was an '89.

John Millican created a document which I was passed from another member here that contained the modifications needed to the IP wiring harness. I guess I should toss that out since it appears it was created from a different year of donor. Right? Even prior to asking this, I've noticed some changes in wire colors from what is actually in my car.



Now, I'm a bit lost. lol. I'm not the best at electrical diagrams.
Thanks!

 

OK, I did a search for pinouts of the C207 connector for '87 (my car) and an '89 (the engine harness). I found an '87 camaro pinout. It appears it may be different from the IP connector in my '87 Firebird. Did the factory have different wiring for firebirds vs camaros? My FSM has the connector, but no pinouts like I've found here.

The pinout locations are identical...

The '87:

 

The '89