1985-1990 Honda Legend Service and Repair Manual

Engine and Drivetrain

• 2.5L C25A and 2.7L C27A SOHC V6 Engines: Complete engine overhaul procedures, mechanical assembly specs, valve adjustments, and timing belt configuration tracking.
• Variable Intake Control System (VICS): Troubleshooting the vacuum-actuated multi-stage intake plenum geometry specific to the 2.7L power plants.
• PGM-FI Electronic Fuel Injection: Diagnostic procedures for early-generation Programmed Fuel Injection setups, including fuel pressure regular monitoring.
• Engine Cooling System: Radiator replacement, mechanical thermostat ratings, cooling fan relays, and water pump belt adjustments.
• Exhaust and Emissions Control: Servicing for early vacuum-driven Exhaust Gas Recirculation (EGR) valves, three-way catalytic converters, and single-wire oxygen sensors.
• 5-Speed Manual and 4-Speed Automatic Transmissions: Differential gear adjustments, clutch replacement steps, hydraulic line layouts, and governor valve testing for early Honda transaxles.

Chassis and Suspension

• Front Double Wishbone Suspension: Upper control arm assembly, lower control arm swap procedures, torsion/sway bar links, and shock absorber rebuilding.
• Rear Independent Suspension: Trailing arm bushing tracking, strut assemblies, and coil spring replacement guidelines.
• Speed-Sensitive Power Steering: Mechanical teardowns for the early speed-proportional power steering rack and pinion oil pump system.
• Wheel Alignment Specifications: Factory specifications for tracking traditional front-wheel manual toe adjustments and rear geometry alignments.
• Wheel Hub and Bearings: Spindle carrier tracking, press-fit wheel bearing replacement paths, and front axle hub castle nut torque values.

Braking Systems

• Early Anti-lock Braking System (ALB): Specialized troubleshooting for the early Honda Advanced Luggage Braking/Anti-Lock Modulator system, high-pressure lines, and wheel sensor voltage gaps.
• Brake Hydraulic System: Master cylinder bore sizing, dual-diagonal brake line bleeding paths, and proportioning control valves.
• Parking Brake Assembly: Mechanical center console hand brake cable routing, tension balancing, and rear caliper mechanical parking brake lever fixes.
• Brake Component Inspection: Minimum wear limits for early non-vented or front-ventilated brake discs and brake pad pad specifications.

Electrical and Wiring

• Complete Factory Wiring Diagrams: Full schematic infrastructure mapping terminal blocks, color-coded power paths, and major chassis ground connections.
• Charging and Starting System: Carbon brush replacement paths for the alternator, starter solenoid motor troubleshooting, and ignition distributor alignments.
• Central Logic Controls: Pinout tracing for early integrated chime timers, wiper intervals, and window lift switches.
• Power Distribution Network: Under-hood main fusible link configurations, passenger compartment fuse panel designations, and main engine relay pathways.
• Lighting Infrastructure: Retractable pop-up headlight mechanical motor alignment (for Coupe variants), fixed halogen headlamps (for Sedans), and cornering illumination light switches.
• Premium Audio and Equipment: Original AM/FM cassette head unit wiring matrices, equalizer control circuits, and power telescoping mast antenna repairs.

Air Conditioning and HVAC

• Manual and Automatic Climate Control: Vacuum pod diagnostics for duct flap redirection, dashboard push-button panel tracking, and heater control valve cables.
• HVAC Core Componentry: Original R12 layout evaporator casing extraction, under-dash blower assembly servicing, and resistor card testing.
• Refrigerant Specifications: Factory volume parameters for original R12 refrigerant capacity, mineral compressor oil specifications, and magnetic clutch spacing.

Body and Interior

• Premium Cabin Trim: Safe removal paths for early wood-grain look dash fascia, center console frame dismantling, and power seat motor tracks.
• Exterior Shell and Glass: Retractable headlamp motor linkages, bumper mount points, manual tilt sunroof sealing lines, and door latch mechanisms.
• Passive Restraint Infrastructure: Driver-side airbag modules (available on select late 1980s model years), control units, and mechanical seat belt pretensioner setups.

Diagnostics and Troubleshooting

• LED Flash Indicator Diagnostics: Step-by-step diagnostic workflows utilizing the built-in LED blinking lights located physically on the Electronic Control Unit (ECU) body under the seat or footwell carpet.
• Component Multi-meter Testing: Exact resistance and voltage benchmark metrics for early manifold absolute pressure (MAP) sensors, throttle switches, and water temperature senders.

Common Error Codes Covered

• Code 1: Oxygen Sensor Circuit Fault or Exhaust Gas Rich/Lean Deviation
• Code 3: Manifold Absolute Pressure (MAP) Sensor Circuit Interruption
• Code 5: Manifold Absolute Pressure (MAP) Sensor Mechanical Vacuum Leakage
• Code 7: Throttle Position (TP) Circuit or Sensor Switch Defect
• Code 12: Exhaust Gas Recirculation (EGR) System Lift Sensor Imbalance

Transmission Codes (LED Blink Codes)

• Code 1: Shift Solenoid Valve ‘A’ Circuit Failure or Stuck Open
• Code 2: Shift Solenoid Valve ‘B’ Circuit Failure or Stuck Closed
• Code 4: Vehicle Speed Sensor (VSS) Intermittent Pulse Loss

ALB/ABS Codes (LED Blink Codes)

• Code 1: High Pressure Fluid Pump Circuit Long Run Warning
• Code 4-1: Right Front Speed Sensor Circuit Open or Signal Interruption
• Code 4-2: Left Front Speed Sensor Circuit Open or Signal Interruption

Network Communication Codes

• Code 11: Electronic Control Unit (ECU) to Automatic Transmission Controller Signal Line Failure

Body Control Codes

• Code 1: SRS Control Module Self-Diagnostic Battery Voltage Low Malfunction
• Code 2: SRS Cable Reel System Disconnection or Excess Resistance

This manual is ideal for:

• Professional automotive workshops
• Independent repair garages
• Mobile mechanics
• Automotive technicians
• Vehicle owners performing DIY repairs
• Automotive training institutions