CHART 2: With California Emissions
The fuel injection computer (known in tech speak as the PCM = Powertrain Control Module) is located on the firewall (passenger side) of your Ford pickup.
The PCM has a 60 pin connector and on the back side of the connector (wire side) are embossed a few numbers to further aid you in correctly identifying the pins (circuits).
APPLIES TO: The PCM connector pinout applies on to the following vehicles:
- 2.3L Ford Mustang: 1990.
| 60 Pin PCM Connector Pinout | ||
|---|---|---|
| Pin | Wire Color | Description |
| 1 | BLK/ORG | Keep Alive Power (KAPWR) |
| 2 | RED/LT GRN | Brake On-Off (BOO) Switch |
| 3 | DK GRN/WHT | Vehicle Speed Sensor (VSS) + |
| 4 | RED/LT BLU | Ignition Diagnostic Monitor (IDM) |
| 5 | -- | Not Used |
| 6 | ORG/YEL | Vehicle Speed Sensor (VSS) - |
| 7 | LT GRN/YEL | Engine Coolant Temp (ECT) Sensor |
| 8 | PNK/BLK | Fuel Pump Monitor (FPM) |
| 9 | WHT/PPL | Data Link Connector (Data -) |
| 10 | PNK/LT BLU | A/C Compressor |
| 11 | --- | Not Used |
| 12 | --- | Not Used |
| 13 | --- | Not Used |
| 14 | DK BLU/ORG | MAF Signal |
| 15 | TAN/LT BLU | MAF Sensor Ground |
| 16 | BLK/ORG | Ignition Module Ground |
| 17 | TAN | Self Test Output (STO) - Check Engine Light (CEL) |
| 18 | --- | Not Used |
| 19 | --- | Not Used |
| 20 | BLK | Case Ground |
| 21 | WHT/LT BLU | Idle Air Bypass Valve |
| 22 | TAN/LT GRN | Fuel Pump Relay Control |
| 23 | YEL/RED | Knock Sensor |
| 24 | YEL/LT GRN | Power Steering Press Switch |
| 25 | LT GRN/RED | Air Charge Temp (ACT) Sensor |
| 26 | ORG/WHT | VREF (5 Volt Reference - EGR Position Sensor, TPS, MAP Sensor) |
| 27 | BRN/LT GRN | EGR Valve Position (EVP) Signal |
| 28 | WHT/BLK | Data Link Connector (Data +) |
| 29 | DK GRN/PPL | Heated Exhaust Gas Oxygen (HEGO) Sensor |
| 30 | PPL/YEL | Clutch Interlock Switch (MT only) Manual Lever Position Sensor (AT only). |
| 31 | GRY/YEL | Canister Purge Solenoid |
| 32 | --- | Not Used |
| 33 | DK GRN | EGR Control (EVR) Solenoid |
| 34 | --- | Not Used |
| 35 | --- | Not Used |
| 36 | YEL/LT GRN | Spark Output (SPOUT) |
| 37 | RED | Vehicle Power (VPWR) |
| 38 | --- | Not Used |
| 39 | --- | Not Used |
| 40 | BLK/LT GRN | PWR Ground |
| 41 | --- | Not Used |
| 42 | --- | Not Used |
| 43 | LT GRN/PPL | AC Clutch Cycling Pressure Switch |
| 44 | --- | Not Used |
| 45 | LT GRN/BLK | Barometric Absolute Pressure (BAP) Sensor Signal |
| 46 | BLK/WHT | Signal Return (Sensor Ground) |
| 47 | DK GRN/LT GRN | Throttle Position Sensor (TPS) Signal |
| 48 | WHT/RED | Self Test Input (STI) |
| 49 | ORG | HEGO Ground |
| 50 | --- | Not Used |
| 51 | --- | Not Used |
| 52 | YEL/LT BLU | Shift Solenoid 3/4 |
| 53 | DK BLU/YEL | Automatic Transmission Clutch Converter Override (CCO) |
| 54 | ORG/LT BLU | WOT AC Clutch Cutoff |
| 55 | --- | Not Used |
| 56 | DK BLU | Profile Ignition Pickup (PIP) |
| 57 | RED | Vehicle Power (VPWR) |
| 58 | TAN/ORG | Injector Bank 1 (Cyl: #1, #4) |
| 59 | TAN/RED | Injector Bank 2 (Cyl: #2, #3) |
| 60 | BLK/LT GRN | Power Ground |
WIRE COLOR LEGEND: You can find the wire color legend here: PCM Connector Pinout Wire Color Legend.
PCM Connector Pinout Wire Color Legend
- BLK = Black
- BLU = Blue
- BRN = Brown
- GRN = Green
- GRY = Grey
- ORG = Orange
- PNK = Pink
- PPL = Purple
- RED = Red
- TAN = Tan
- VIO = VIO
- WHT = White
- YEL = Yellow
Some of the wires coming out of the PCM connector will have a stripe. With these wires, a slash is used to show both colors. For example:
- BLK/WHT = Black with a white stripe.
- ORG/BLK = Orange with a black stripe.
The first color is the main one, and the color after the slash is the stripe.
A few wire colors will have a 'LT' or a 'DK' before the color, like 'LT BLU' or 'DK BLU'. In this cases, the 'LT' refers to the word 'light' and the 'DK' refers to the word 'dark'. For example:
- LT BLU = Light blue.
- LT GRN/BLK = Light green with a black stripe.
- DK GRN/WHT = Dark green with a white stripe.
If this info saved the day, buy me a beer!
