Wiring Diagrams — Ford F-250 1987-1991
Technical Reference
Member-uploaded diagrams & documents for this generation. AI-classified; community-verified where badged.
Wiring Diagrams
- Connector pinout chart for the C115 connector listing all 42 pins and their electrical signal assignments and circuit functions.
- Connector face views and pin-to-circuit chart for the C115F and C115M in-line connectors listing color-coded circuits.
- PCM C202 connector face view with a pin-by-pin circuit and function chart listing color-coded wires and signal names.
- Connector face views and pin-to-circuit chart for the C116F and C116M in-line connectors listing color-coded circuits.
- Connector face views and pin-to-circuit chart for the C115F and C115M in-line connectors listing color-coded circuits.
- Wiring diagram of instrument cluster, transmission controls and camshaft position sensor circuits to the PCM with color codes.
- Wiring diagram of heated oxygen sensors 1 and 2, ECT, throttle position and EGR valve position sensor circuits to the PCM.
- Wiring diagram of heated oxygen sensors 3 and 4, octane adjust and intake air temperature sensor circuits to the PCM with color codes.
- Wiring diagram of fuel injectors 1-4, EGR vacuum regulator, IAC valve and vehicle speed sensor circuits to the PCM with color codes.
- Wiring diagram of fuel injectors 5-8, data link connector and fuel tank pressure transducer circuits to the PCM with color codes.
- Wiring diagram of A/C clutch relay, EVAP canister purge valve, vapor management and ignition circuits to the PCM with color codes.
- Wiring diagram of fuel pump relay, inertia fuel shutoff and PCM power circuits with color-coded wires and fuel tank sender.
- Wiring diagram showing MAF, IAT, TP and ECT sensor circuits to the PCM with transmission control switch and color-coded wires.
- Wiring diagram of the 4R70W transmission solenoids (TCC, EPC, shift, TFT sensor) connected to the PCM with color codes.
- Wiring diagram of PCM power relay, output shaft speed sensor and transmission range sensor circuits with color codes.
- Connector pinout for the overdrive switch showing terminal numbers and color-coded circuits such as 57 BK and 298 P/O.
- Starter wiring instructions diagram showing battery positive cable, starter cable, and solenoid stud connections.
- Wiring diagram showing voltmeter, accessory outlets and gauge illumination circuits with color-coded wires and labels.
- Continuation table of PCM connector pins listing circuit numbers, wire colors and functions such as injector and sensor controls.