Like the title says, I'm looking for the pinout of the c203 and c500 connectors for an 84 and for an 87. I put a engine (cradle and all) from a 87 into my 84 coupe and now need to know what wires to change around. The best would be to use the interior wiring harness from the 87 donor car but that was not able to happen. It was destroyed by mice when the car was in storage, I purchased it that way. Any help would be greatly appreciated.

James

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88 Coupe: Modded 4.9L V8 5 speed
87 Coupe: 4 Cyl 5 Speed
84 Coupe: 4 Cyl 4 speed
01 BMW 525i
www.geocities.com/fast88fiero

The '86 Fiero Service Manual is flat out huge. In case you want it for yourself, go to http://spad.sytes.net/fiero/manuals/ and down load the Pontiac_Fiero_1986_Service_Manual.pdf (and anything else that looks good). 76 meg. It has everything under the sun about the car.
This is the C500. Its large so you can zoom and read the details. Page 1059 of the FSM. (1303 pages total)


This site has pinouts for the different ECM's. The FSM only shows the C203 connector, not the pins. Get the ECM you are looking for and find the pins on the C203. http://home.att.net/~subzero350/

Here's a C500 diagram, I'm not sure what year it's from, but it's different than the one in my 84 manual.



I'll re-do the pinouts to match the 84 manual and post it later.

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1984 Fiero SE

Fiero C203 connector
Pos. Wire color Circuit Description
A Tan/Black Upshift lamp Grounding this wire will make the upshift indicator come on.
B Orange Fuel Pump Positive feed for the fuel pump relay. Hot at all times fused 10A
C Brown/White SES lamp Grounding this wire will make the "Service Engine Soon" indicator come on
D Lt Blue A/C on Positive feed for the A/C compressor control relay coil. Hot when A/C is on.
E Tan Oil gage Connect to oil pressure sender, 90 ohms at max pressure
F Pink/Black ECM Ign. Positive feed for ECM. Hot in run, bulb test, or start. fused 10A.
G Yellow VSS high VSS input to speedometer. Connect to magnetic VSS or converted 4000 PPM signal from ECM. Note 3
H Brown VSS feed for ECM Feeds buffered VSS signal to ECM when a magnetic VSS is connected to speedometer. Note 3
J Pink TBI INJ1 Positive feed for injector. Hot in run, bulb test, or start. fused 5A
K Pink TBI INJ2 Positive feed for injector. Hot in run, bulb test, or start. fused 5A
L Tan/White Fuel pump Positive side of fuel pump, gets connected to the COM terminal of the fuel pump relay.
M Black VSSB ground Connect to ground
N Black A/C Power Positive feed for A/C compressor control relay contacts. Fused 25A
P Purple TCC Brake switch TCC brake. Hot in run, bulb test, or start only when brake pedal is NOT depressed.
R Purple VSS low VSS input to speedometer. Connect to magnetic VSS or to ground if using optical VSS and converter. Note 3

Notes
1. F is the switched power feed for the ECM, all switched 12 volt inputs on the ECM can be connected to this terminal. The constant 12 volt supply for the ECM comes from the rust colored fusible link with a single weatherpack disconnect at the terminal block near the battery.
2. J, & K are the positive feeds for the fuel injectors, One for each injector on TBI systems or one for each bank on PFI systems.
3. The Fiero speedometer system works differently than most other GM vehicles. Click HERE for more info.

Best I could do with what I have.

Steve

You people are great...I needed this info too, but wasn't quite comfortable asking for it yet since I hadn't done the research on my own yet.

SO much easier to just read it here in one place....thanx.

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Thanks guys! I'll be switching some wires around monday and see if it fires up.

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88 Coupe: Modded 4.9L V8 5 speed
87 Coupe: 4 Cyl 5 Speed
84 Coupe: 4 Cyl 4 speed
01 BMW 525i
www.geocities.com/fast88fiero