Jeep Grand Cherokee WJ 1999 Service Manual (P/N 81-370-9147)

Factory service information for the 1999 Jeep Grand Cherokee WJ, P/N 81-370-9147, covering the 4.0L six-cylinder and 4.7L V-8 gasoline engines plus the 3.1L turbo diesel. The electronic manual includes variant-specific chapters and incorporated service-manual revision pages.

PDF Files, Search and Chapter Navigation

Text search and diagram detail: The PDFs contain searchable text. Embedded bookmarks navigate the chapter files; the welcome screen and group locator have no bookmarks. Small wiring labels are best viewed with zoom.

The ZIP contains 55 printable PDFs totaling 2,234 pages: 53 chapter files, a one-page welcome screen and a one-page group locator. The total includes those two navigation pages and 43 blank pages.

Engine, Drivetrain and Vehicle-System Service

The following selected coverage highlights outline the main workshop areas. Other included topics range from power-sunroof service to stationary-glass replacement.

• Engine and cooling: Internal engine repair, timing-drive service, cooling-system pressure tests, and radiator, thermostat and water-pump replacement.

• Fuel and emissions: Gasoline fuel-delivery tests, PCM operation and emissions monitoring; diesel injection-pump timing, air bleeding, injector checks and glow-plug testing.

• Automatic transmissions: Diagnosis, hydraulic pressure testing, removal, disassembly and internal repair for the 42RE, 45RFE and diesel 44RE units.

• Transfer cases and axles: NV242 and NV247 overhaul, axle-bearing and seal replacement, differential setup, and Trac-Lok and Vari-Lok testing.

• Brakes, suspension and steering: Brake bleeding, caliper service, scan-tool-assisted ABS bleeding, wheel alignment, suspension-joint replacement and power-steering tests.

• Electrical troubleshooting: Battery and starter tests, charging-system checks, ignition diagnosis, airbag service information, circuit diagrams and connector identification.

• Climate control and body: Automatic Zone Control self-diagnosis, refrigerant-system service, heater-A/C housing removal, and door, liftgate and interior-component procedures.

Suited to technicians and experienced owners familiar with electrical testing and major mechanical disassembly; some diagnostic routines require a DRB scan tool.

Engine Work and Maintenance Planning

Normal Schedule A and severe-service Schedule B maintenance requirements are set out alongside lubricant recommendations, fluid-capacity tables and inspection requirements. These references support routine service planning as well as larger repair jobs.

Step-by-step procedures extend to cylinder heads, pistons, crankshaft bearings and timing components. The diesel chapter includes cylinder-liner removal with tool VM-1001; the V-8 material identifies Engine Lifting Fixture 8347 and Chain Tensioner Wedge 8350.

The V-8 instructions warn that incorrect installation of the engine-to-transmission structural cover can severely damage the cover.

Transmission and Differential Diagnosis

Valve-body, clutch-pack and oil-pump procedures are supported by hydraulic schematics and inspection specifications. The 45RFE section also describes the DRB Quick Learn procedure following specified transmission repairs.

The axle chapters distinguish the 186 FBI, 198 RBI and 226 RBA assemblies, with gear-contact, backlash and bearing-preload information. This lets a workshop match its inspection and overhaul work to the installed differential rather than apply one setup to every axle.

Fuel-System Tests and Diagnostic Limits

Fuel-pressure, pump-capacity and leak-down tests help distinguish fuel-supply faults from injector or pump check-valve leakage when investigating difficult hot restarts. Exhaust coverage includes manifold, catalytic-converter and muffler service with connection-specific torque tables.

For the diesel, the injection pump is serviced as a complete replacement assembly rather than internally overhauled. Separate Powertrain Diagnostic Procedures and Chassis Diagnostic manuals are referenced for certain engine-control, injector-circuit and ABS tests; those publications are not included.

Always depressurize the fuel lines and observe standard shop safety protocols before servicing any high-pressure fuel components mentioned in this guide.

Circuit Tracing and Climate-Control Faults

The Starting System, Fuel/Ignition System and Transmission Control System diagrams distinguish relevant engine and steering configurations. Connector Pin-Outs and Splice Locations connect the circuit drawings to individual terminals and harness junctions.

The manual reserves airbag service for Chrysler-trained, authorized dealer service technicians.

The climate-control chapter includes Automatic Zone Control fault-code, input-circuit and output/actuator tests. Refrigerant pressure-diagnosis charts relate gauge readings to possible restrictions, charge problems and compressor faults.

Fuel-Test and Exhaust-Torque Examples

For gasoline engines, the warm-engine fuel-pressure leak-down test specifies at least 30 psi for five minutes after shutdown. The injector-only resistance specification is approximately 12 ohms ±1.2 ohms at 20°C (68°F).

The Group 11 exhaust table lists exhaust pipe-to-manifold nuts at 31 N·m (23 ft. lbs.) and catalytic-converter-to-exhaust-pipe and muffler-to-catalytic-converter U-bolt clamps at 61 N·m (45 ft. lbs.).