Engine Service Repair:
In-depth coverage including disassembly, assembly, component testing, diagnosis, and specifications.
Transmission Service Repair:
Detailed procedures for both manual and automatic transmissions, including removal, installation, and internal repairs.
Brake System:
Comprehensive information on hydraulic systems, disc and drum brakes, ABS (if equipped), and related components.
Wiring Diagram:
Complete electrical schematics for all vehicle systems, essential for diagnosing electrical faults.
Electrical System:
Diagnosis and repair of starting, charging, ignition, lighting, and accessory systems.
Suspension:
Front and rear suspension components, alignment procedures, and shock absorber/strut replacement.
Steering:
Power steering system, steering gearbox, linkage components, and related adjustments.
Cooling System:
Radiator, water pump, thermostat, hoses, and cooling fan diagnosis and repair.
Fuel Injection Fuel System:
Fuel pump, injectors, pressure regulator, fuel lines, and diagnostic procedures for fuel delivery.
Emission System:
Catalytic converter, oxygen sensors, EGR system, and emission control diagnostics.
Engine Control System:
ECU/PCM operation, sensor inputs/outputs, and diagnostic trouble codes (DTCs).
Chassis Body:
Body panel repair, frame straightening, door mechanisms, and interior trim.
Restraint System:
Seat belt operation, airbag system components (diagnosis only, due to safety criticality), and SRS warning light.
Axle:
Front and rear axle assemblies, differential service, and hub maintenance.
General Maintenance:
Scheduled maintenance tasks, fluid level checks, filter replacements, and tire rotation.
Troubleshooting:
Systematic diagnostic procedures for common and uncommon vehicle issues.
Periodic Lubrication:
Lubrication points, recommended lubricants, and service intervals.
Disassembly Reassembly:
Step-by-step instructions for dismantling and reassembling vehicle components.
Repair:
Detailed repair procedures for all covered systems.
Service:
Routine servicing and preventative maintenance tasks.
Maintenance:
Comprehensive maintenance information.
Refurbish Renovate Mend Fix:
Guidance on restoring and repairing worn or damaged parts and systems.
Depth:
Comprehensive, covering basic to advanced repairs, diagnostics, and specifications.
NHTSA Ratings:
Information for 1994 vehicles may be limited. Generally considered safe for its era, but lacking modern safety features.
ABS:
Optional on some models, typically rear-wheel ABS.
Airbags:
Driver-side airbag standard, passenger airbag not available on YJ, optional on XJ in later years.
Seat Belts:
Front 3-point, rear lap and shoulder belts where applicable.
Oil Change Interval:
Typically every 3,000 miles or 3 months (depending on driving conditions).
Transmission Fluid Change:
Automatic: 30,000 - 60,000 miles; Manual: Inspect periodically, typically replaced at higher mileage or if issues arise.
Coolant Flush:
Every 30,000 - 50,000 miles or 2-3 years.
Engine Oil Specification:
API SG or SH, SAE 10W-30 (check owner's manual for specific viscosity based on temperature).
Coolant Specification:
Ethylene Glycol based antifreeze (typically green), 50/50 mix with distilled water.
Transmission Fluid Auto:
ATF+3 (Chrysler spec) or equivalent for AW-4, ATF DEXRON-III for other automatics.
Common Problems:
Head gasket issues (especially on 4.0L), worn motor mounts, C-clip axle retention (can lead to axle walk-out), vacuum leaks, rust (frame, body panels, rocker arms), alternator failure, CPS (Crankshaft Position Sensor) failure on 4.0L.
