Schematics — Ford Bronco 1987-1991

Technical Reference

Member-uploaded diagrams & documents for this generation. AI-classified; community-verified where badged.

Schematics

• Belt routing schematic comparing 84.5, 70.5 short and stock 5.0 serpentine belt paths around accessory pulleys.
• Cross-section of a secondary air bypass/diverter valve identifying the vacuum nipple, air inlet, air outlet and the remote dump connection port.
• Figure 125 schematic of a vacuum check valve showing three body styles, free-airflow direction, and the black vacuum side.
• Schematic line drawing of a vacuum control valve identifying the inlet and the two outlet ports (A and B).
• Cutaway schematic of a Ford idle air control valve labeling the solenoid, diaphragm, valve body, vent/filter, and air flow inlet and outlet.
• Cross-section diagram of a vacuum control solenoid showing the electrical connector, solenoid coil, plunger and spring with inlet (atmosphere) and outlet (manifold vacuum) ports.
• Schematic cross-section of an idle air control solenoid showing the valve body, inlet (atmosphere) and outlet (manifold vacuum) ports.
• Schematic of a throttle position sensor potentiometer showing the rotating wiper, resistive element and VREF/TP SIG/SIG RTN leads.
• Integral gear power steering function schematic with cutaways showing high/low pressure oil flow during turns.
• Schematic showing rear-view routing of air-injection check valves and air control valve with connecting hoses.
• Schematic of the engine air-injection plumbing with air pump, check valves, air bypass valve and hose routing, front view.
• Secondary air schematic with color-coded routing of the air bypass valve, thermactor dump silencer, inlet filter and air pump.
• Secondary air schematic (front view) with color-coded hoses connecting the silencer/filter, air bypass valve and air pump.
• Secondary air schematic with color-highlighted check valves, combination air control valve and air pump routing.
• Secondary air schematic with color-highlighted air pump, air bypass valve and check valve plumbing at the front of the engine.
• Secondary air schematic showing check valves, valve assembly, air bypass valve and air pump routing at the front of the engine.
• Secondary air schematic (rear view) showing the air control valve and check-valve locations on the engine.
• Secondary air schematic (front view) showing the silencer/filter, air bypass valve and air pump plumbing.
• Secondary air schematic showing the check valves, combination air control valve and air pump routing on a V-engine.
• Secondary air schematic showing the air bypass valve, check valve and air pump plumbing at the front of the engine.
• Secondary air schematic showing the air bypass valve, thermactor dump silencer, air pump inlet filter and pump assembly on the engine.
• Secondary air schematic showing the air diverter and bypass valves, check valves, crossover tube and air pump routing at the front of the engine.
• 5.8L secondary air schematic showing the air diverter and bypass valves, dump silencer, inlet filter and air pump routing on the engine.
• Relay schematic showing numbered socket terminals and the internal coil and switching contacts mapped to pins 30, 85, 86, 87 and 87a.
• Reference diagram of a standard 5-pin automotive relay explaining terminals 30 load, 85/86 control coil, 87 energized feed and 87a de-energized feed.
• Relay diagram showing the 5-pin socket layout and internal coil and contact schematic with terminal numbers 30, 85, 86, 87 and 87a.
• Ford EEC-IV pinpoint test schematic (17-77) for the Throttle Position (TP) sensor: test pins 26 VREF, 46 SIG RTN, 47 TP at breakout box, with standard and alternate TP connector views for 1.9L MA A/T and 3.0L.
• Thread specification diagram showing a 1/2 inch diameter fastener with a pitch of 20 threads per inch.
• Diagram comparing three lug nut seat types (acorn/tapered, mag seat with washer, ball seat) with cross-sections of nut and wheel.
• 5.0L/5.8L HO firing order diagram (1-3-7-2-6-5-4-8) with anti-crossfire spark plug wire routing and 10-degree base timing.
• Ford EVTM component location view 151-12 for the 165-amp alternator charging system; maps alternator, voltage regulator, starter relay, charge indicator lamp relay, fuse links and connectors.
• Component location view (frame rail) identifying speed sensor, ABS sensors, fuel pumps, turn/stop lamps, and connector callouts.
• Component location view (full body, F-Series) identifying door motors, cargo and turn lamps, switches, and connector callouts.
• Component location view (full body, Bronco) identifying door motors, lamps, window controls, and connector callouts throughout the body.
• Component location view behind the dash identifying switches, relays, control modules, and connector numbers for the vehicle wiring.
• Ford EVTM component location view 151-7 for the 7.5L engine (2 of 2); maps fuel injectors, radio capacitor, ignition coil, EEC power relay, fuel pump relay, canister purge solenoid and connectors.
• Ford EVTM component location view 151-6 for the 7.5L engine (1 of 2); maps MAP sensor, idle speed control solenoid, EGR valve position sensor, TAD/EGR control solenoids, fuel injectors and connectors.
• Ford EVTM component location view 151-5 for the 7.3L diesel; maps glow plug controller, TEC module, fuel water switch, fuel injection pump lever, cold-idle/timing-advance solenoids and connectors.
• Ford EVTM component location view 151-4 for 5.0L/5.8L engines (2 of 2); maps MAP sensor, knock sensor, TAD/EGR control solenoids, fuel pump relay, ACT sensor, canister purge and connectors.
• Ford EVTM component location view 151-3 for 5.0L/5.8L engines; maps fuel injectors, TAB solenoid, EEC module, coolant temp sender, EGR position sensor, TPS, idle air bypass and connectors.
• Component location view of the 4.9L engine showing TPS, EEC module, sensors, relays, and connector callouts across the engine compartment.
• Ford EVTM component location view 151-1 for the 4.9L engine; maps ECT, ACT, TPS, MAP, EGR position sensor, EEC module, TFI and connectors C100-C154 by grid zone.