1981 electricalvacuumtroubleshootingmanual for ford's F-series pickups and broncos
The following is from the 1981 EVTM:
- How To Use This Manual: (Pages 2-5) Includes wire color abbreviations, electrical symbols and how to find electrical problems.
- Grounds: (Pages 6-9) What circuits share grounds and where they are located
- Fuse Block & Circuit Protection: (Pages 10-11) Description of fuses, breakers, fuse links, diodes, as well as what fuses protect which circuits
- Charge & Power Distribution: (Pages 12-17) Alternator, regulator, start solenoid, auxiliary battery & solenoid, ignition switch, light switch, fuse block, and fuse links
- Start, Ignition, & Carb Circuits: (Pages 18-29) Covers both Duraspark and EEC ignitions, carb circuits, device locations, and how the circuits work
- Feedback Carb Control (MCU): (Pages 30 & 31) Includes Microprocessor Control Unit (MCU), solenoids (octane, cannister purge, thermactor air bypass, thermactor air divertor, vacuum regulator), O2 sensor, vacuum switch unit, how it works, and component locations
- Feedback Carb Control (ECU): Pages 32-37) Inferred mileage sensor, EEC power relay, ignition module, ECU, crankshaft position sensor, throttle kicker solenoid, EGR control solenoid, cannister purge solenoid, thermactor air diverter solenoid, thermactor air bypass solenoid, carb actuator stepper motor, EGR valve position sensor, barometric pressure sensor, manifold absolute pressure sensor, throttle position sensor, engine coolant temperature sensor, electronic control assembly (ECA), exhaust gas oxygen sensor, clamping diode, how the circuits work, troubleshooting tips, and component locations
- Lights: (Pages 38-53) Includes head, exterior, park, marker, license, fog, backup, hazard, stop, turn, tail, cargo, dome, map, and lights-on warning
- Instrument Illumination: (Pages 54 & 55) Includes instrument & switch illumination as well as instrument cluster pin outs and the fuel tank valve's location
- Warning Indicators & Seatbelt Warning: (Pages 56 & 57) Brake, oil pressure, and seat belt warning lights/buzzers
- Fuel Tank Selector & Gauges: (Pages 58 & 59) Fuel tank switch and valve, as well as oil pressure, coolant temp, and fuel level gauges and sending unit, as well as the Instrument Cluster Voltage Regulator (ICVR)
- Windshield Wiper/Washer: (Pages 60-63)
- Tailgate Power Window/Rear Window Deice (Pages 64-65)
- Horn, Speed Control, & Cigar Lighter: (Pages 66-69) Includes the horn & cruise control switches, relay, and controller
- Digital Clock: (Pages 70 & 71) Wiring, troubleshooting and component locations
- Power Windows: (Pages 72 & 73) Includes motors, switches, connectors, how they work, and component locations
- Power Door Locks: (Pages 74 & 75) Includes actuators, switches, connectors, how they work, and component locations
- Radios: (Pages 76-79) Covers both mono and stereo units
- Heating, Ventilation, & A/C: (Pages 80-87) Covers heater, auxiliary heater, Comfort Vent heater, & A/C. Includes blower motors, blower resistors, blower switches, vacuum solenoids, vacuum motors, and vacuum controls.
- Camper/Trailer: (Pages 88 & 89) Includes trailer brake control and wiring, as well as wiring to the trailer and camper lighting
- Four-Wheel Drive Indicator: (Pages 90-91) Includes the 4wd indicator, 4wd switch, differential lockout indicator switch, and component locations including the Bronco's auxiliary heater
- Vacuum Distribution: (Pages 92-94) Shows the vacuum distribution block and the hoses to it from the source via the manifold fitting as well as to the air cleaner, power brake booster, automatic transmission, MAP sensor, A/C-Heat control, and auxiliary heater. In addition, it shows how to find vacuum problems, gives the vacuum symbols used, and explains how the vacuum motors work.
- Component Testing: (Pages 95-101) Shows how to test the light switch, ignition switch, turn/hazard switch, windshield wiper/washer switch, interval wiper/washer switch, A/C-Heat function control, and A/C-Heat blower switch.