Jeep Wrangler TJ 2002 Service & Diagnostic Manual Set

The diagnostic volumes provide fault-isolation tests and refer to the service manual for removal and repair procedures. Together, they support the transition from a reported symptom or trouble code to the corresponding mechanical or electrical work.

PDF Search, Bookmarks, and Diagram Detail

Text search and navigation: The service manual is partially searchable; many wiring-diagram pages have no searchable text. The three diagnostic manuals support text search. All four manuals contain detailed bookmarks, although the service manual’s main bookmark opens the comment form. The two supplementary files have no embedded bookmarks. Small wiring labels require zooming, particularly in the dense powertrain schematics.

The ZIP contains six printable PDFs totaling 2,128 pages, including the separate title, foreword, and navigation files. That total also includes 32 blank pages, 12 notes pages, and two comment-form/mailing pages within the manuals.

Engine Overhaul, Drivetrain Service, and System Diagnostics

The following selected coverage highlights show the repair and diagnostic scope. Additional topics include audio-system service and front and rear wiper/washer repair.

• Engine repair: Step-by-step procedures cover engine removal, cylinder-head repair, timing-chain service, and crankshaft/piston inspection for the 2.5L and 4.0L gasoline engines.

• Transmission and transfer case: Internal overhaul of AX5 and NV3550 manual transmissions, 30RH and 32RH automatics, and the NV231 transfer case.

• Axles and driveline: Teardown and assembly of the 181FBI front axle and 194RBI/216RBI rear axles, including Trac-Lok differential repair where equipped.

• Brakes, suspension, and steering: Wheel alignment, brake hydraulic-system bleeding, ABS component service, suspension-component replacement, and power-steering gear repair.

• Body and HVAC: Door, roof, and windshield-frame service, body-opening dimensions, HVAC-housing teardown, and heater-core and evaporator replacement.

• Electronic diagnosis: DTC-based and symptom-based troubleshooting, circuit tests, connector views, wiring diagrams, and post-repair verification routines.

The service manual is written for professional automotive technicians; the diagnostic volumes call for a DRBIII scan tool and system-specific test equipment.

Engine Diagnosis and Internal Repair

Mechanical diagnosis includes compression and cylinder-leakage testing, oil-pressure checks, and oil-leak testing. Internal engine sections cover valve-seat work, bearing fitting, piston-ring fitting, and front and rear crankshaft seals.

Ignition coverage distinguishes the distributor-equipped 2.5L from the 4.0L coil-rail system. An exploded distributor view accompanies camshaft-position sensor and oil-pump-drive service information.

Fuel-system diagnosis includes pressure, delivery, and leak-down testing. Oxygen-sensor documentation distinguishes Federal and California/European III configurations where applicable.

Transmission, Transfer Case, and Axle Setup

Configuration checks: VIN and body-code decoding, axle identification, and transmission identification help distinguish installed equipment before selecting repair procedures. AX15 appears in the introductory identification chart, but the manual-transmission repair chapters cover AX5 and NV3550.

Clutch and transmission: Clutch diagnosis, disc replacement, flywheel inspection, and hydraulic-linkage service have their own section. Manual-transmission procedures address shift mechanisms and synchronizers; automatic-transmission coverage adds hydraulic-pressure testing, clutch and band air tests, valve-body service, and cooler flushing.

NV231 service: Procedures extend to chain replacement and shift-linkage adjustment. The oil pump is supplied as a replacement assembly; its internal parts are not individually serviceable.

Differential setup: Pinion-depth measurements, side-gear clearance checks, and bearing-preload shim selection accompany Gear Tooth Contact Patterns charts. Propeller-shaft coverage includes single- and double-Cardan universal joints and driveline vibration diagnosis. The axle procedures warn that excessive housing spread can distort or damage the differential housing.

Chassis, Cooling, and Body Work

Suspension coverage includes coil springs, shock absorbers, stabilizer bars, track bars, and control arms, together with hub/bearing units and ball joints. Base-brake sections address disc and drum service, power-booster testing, and parking-brake adjustment.

Cooling-system diagnosis addresses overheating, coolant leakage, and viscous fan-clutch operation. Body procedures distinguish full and half doors and hard and soft tops, with weld and sealer locations supporting structural work.

Heating and air conditioning coverage adds vacuum diagnosis and refrigerant-system testing to the component-replacement procedures.

Working on heavy suspension and drivetrain components poses crushing or pinching hazards. Always use properly rated jack stands and hoists before getting under the vehicle.

Fault Isolation and Wiring References

Gas Powertrain: Diagnostic tests address no-start conditions, misfires, fuel delivery, oxygen-sensor and EVAP faults, torque-converter-clutch circuits, and Sentry Key Immobilizer System problems. PCM/SKIM replacement programming and ignition-key programming are also covered.

Body and Chassis: Body diagnostics address airbags, the electro/mechanical instrument cluster, rear-window defogging, and PCI-bus communication. Chassis diagnostics concentrate on Teves ABS wheel-speed sensors, the G-switch, pump-motor faults, and controller communication.

Electrical references include 8W-30 Fuel/Ignition System, 8W-80 Connector Pin-Outs, and the Airbag System and Vehicle Communications schematics. Connector, ground, and splice locations help relate circuit tests to the vehicle’s wiring.

Special Tools and Workshop Reference Data

Component-specific torque tables, fluid capacities, lubricant requirements, wear limits, clearance specifications, pressure-test data, and electrical test values accompany the procedures.

Special-tool callouts include Dial Indicator C-3339, airbag load tools 8310 and 8443, and Evaporative Emissions Leak Detector 8404. The powertrain manual warns that test-light use on specified sensor, supply, and communication circuits can damage the PCM.

Front Axle Setup: Selected Specification Examples

For the 181FBI front axle, the ring-gear backlash specification is 0.12–0.20 mm.

The pinion-bearing preload table distinguishes original bearings, at 1–2 N·m, from new bearings, at 2–3.4 N·m. These separate rotational-resistance specifications accompany the axle’s bearing and gear-setting procedures.