Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1991 Mercury Cougar LS, 3.8 4FACTORY OEM SERVICE PROCEDURE
3.8L SPFI-Ma (SC)
3.8L SPFI-MA SC TEST PIN WIRE COLOR IDENTIFICATION
| Application | Wire Color |
|---|---|
| Pin 1 (KAPWR) | Yellow |
| Pin 3 (VSS DIF +) | Dark Green/White |
| Pin 4 (IDM) | Dark Green/Yellow |
| Pin 6 (VSS DIF -) | Black/White |
| Pin 7 (ECT) | Light Green/Yellow |
| Pin 8 (FPM) | Pink/Black |
| Pin 9 (MAF RTN) | Tan/Light Blue |
| Pin 10 (ACCS) | Pink/Light Blue |
| Pin 11 (CANP) | Gray/Yellow |
| Pin 12 (INJ 6) | Light Green |
| Pin 13 (EDF) | Tan/Orange |
| Pin 15 (INJ 5) | Tan/Light Blue |
| Pin 16 (IGN GND) | Light Blue |
| Pin 17 (STO/MIL) | Yellow/Black |
| Pin 18 (DATA +) | Tan/Orange |
| Pin 19 (DATA -) | Pink/Light Blue |
| Pin 20 (CASE GND) | Black |
| Pin 21 (ISC) | Red/Light Green |
| Pin 22 (FP) | Tan/Light Green |
| Pin 23 (KS) | Yellow/Red |
| Pin 24 (CID) | Dark Green |
| Pin 25 (ACT) | Light Green/Purple |
| Pin 26 (VREF) | Orange/White |
| Pin 29 (OCT ADJ) | Black/White |
| Pin 30 (NDS) | Red/Light Blue |
| Pin 31 (HEDF) | Pink |
| Pin 32 (ACL) | Orange/White |
| Pin 35 (INJ 4) | Brown/Light Blue |
| Pin 36 (SPOUT) | Yellow/Light Green |
| Pin 37 (VPWR) | Red |
| Pin 39 (INJ 3) | Brown/Yellow |
| Pin 40 (PWR GND) | Black/Light Green |
| Pin 43 (HEGO-L) | Tan/Red |
| Pin 44 (HEGO-R) | Tan/Orange |
| Pin 45 (BP) | Dark Blue/Light Green |
| Pin 46 (SIG RTN) | Black/White |
| Pin 47 (TP) | Dark Green/Light Green |
| Pin 48 (STI) | White/Red |
| Pin 50 (MAF) | Dark Blue/Orange |
| Pin 53 (SIL) | Purple |
| Pin 54 (WAC) | Red |
| Pin 56 (PIP) | Dark Blue |
| Pin 57 (VPWR) | Red |
| Pin 58 (INJ 1) | Tan |
| Pin 59 (INJ 2) | White |
| Pin 60 (PWR GND) | Black/Light Green |
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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