Jeep Cherokee XJ & Wrangler YJ 1994 Factory Service Manual Set (P/N 81-370-4146)

Use the factory manual for routine maintenance, diagnosis, and mechanical repair. Its heating and A/C chapter covers R-12, while the supplement provides the refrigerant-specific procedures and specifications for the later R-134a system.

For dedicated rear suspension and axle repair, obtain Group 3 separately. The file labeled Group 3 repeats the fuel-system chapter. Full DRB powertrain scan-tool routines are in the separate Powertrain Diagnostic Procedures manual.

PDF Search, Bookmarks, and File Contents

Search and diagram detail: Service text is searchable. Most wiring sheets and some illustrated tables carry their labels as images. Zoom in to read small pin numbers and wire codes. Chapter PDFs have bookmarks. The separate front matter, indexes, and CD-ROM guides use page navigation.

The ZIP contains 45 printable PDFs totaling 1,784 pages. That total includes six pages of base-manual front matter and inside covers, the supplement’s front matter and index, and 12 pages of CD-ROM welcome and operating instructions.

Engine, Drivetrain, and Electrical Service

The selected service topics below show part of the coverage. Other examples include power-seat switch continuity checks and factory trailer-tow wiring.

• Engine repair: Compression and cylinder-leakage tests, engine removal and installation, cylinder-head and valvetrain work, timing components, lubrication-system service, and piston and crankshaft inspection.

• Fuel and cooling: Multiport fuel injection diagnosis, fuel-pump pressure, delivery and leak-down tests, radiator flow checks, cooling-system pressure testing, and fan service.

• Transmission and transfer cases: AX 4, AX 5, AX 15, 30RH, 32RH, and AW-4 diagnosis and repair, plus NP231 and NP242 removal and overhaul.

• Front axle and steering: Model 30 hub and axle-shaft service, differential setup, steering diagnosis, and steering gear overhaul.

• Brakes: Standard and ABS bleeding, hydraulic component service, wheel-speed sensor checks, and hydraulic control unit and ABS controller service.

• Electrical diagnosis: Starting, charging, and ignition tests, plus circuits for gauges, lighting, power accessories, speed control, and HVAC controls.

• Air conditioning: R-12 component service and R-134a performance testing, leak diagnosis, recovery, evacuation, charging, and refrigerant-oil specifications.

Chrysler prepared the service information for professional automotive technicians doing day-to-day repair work.

Maintenance, Fuel Injection, and Cooling

Group 0 covers normal and severe-service schedules, approved fluids and capacities, routine inspections, hoisting, and towing. The engine chapters include rear main seal replacement and block inspection limits for the 2.5L and 4.0L engines.

The fuel chapter covers tank and sender service, throttle bodies, injectors, and PCM inputs and outputs. The emissions chapter includes vacuum-routing diagrams. The cooling chapter identifies reverse-rotation water pumps and explains how the wrong pump rotation can cause overheating. Intake and exhaust manifold service is covered in the exhaust chapter.

Transmission Testing and Front Differential Setup

The 332-page transmission and transfer-case group includes automatic-transmission road, stall, and hydraulic pressure tests, along with valve-body and clutch-pack inspection. The 30RH/32RH section identifies internal parts that changed for 1994 and addresses contamination after converter or pump failure. The NP231 section distinguishes versions with and without synchronizer components.

Front axle repair includes universal joints, differential removal, and ring-and-pinion setup. The Model 30 procedures reference Spreader W-129-B and Pinion Gauge Set 6774. Separate chapters cover clutch hydraulic linkage and propeller-shaft repair.

Wiring, Body, and Refrigerant Service

The 348-page wiring group covers factory systems and options, with a dedicated right-hand-drive Cherokee section. XJ fuse-panel and power distribution center layouts, 2.5L and 4.0L engine circuits, AW-4 control module connector views, ABS wheel-speed sensor circuits, and A/C compressor-clutch wiring let you trace a circuit through its fuse, splices, and connector pins.

Body and frame chapters provide collision-alignment reference dimensions and procedures for doors, glass, interior trim, bumpers, the Cherokee liftgate, and the Wrangler tailgate and hard and soft tops. R-12 and R-134a systems use different refrigerants, compressor oils, service fittings, and recovery equipment.

Fuel Pressure and Front Axle Setup Examples

The multiport fuel injection specifications list 214 kPa (31 psi) with vacuum applied to the pressure regulator and 269–276 kPa (39–41 psi) without vacuum. The two readings give you a reference for checking the regulator’s response.

For the Model 30 front differential, the ring-gear backlash specification is 0.005–0.008 in (0.12–0.20 mm). The manual allows up to 0.002 in (0.05 mm) of variation across the three measurement points.