1999–2002 Isuzu 6VE1, 6VD1, 4JX1 Workshop Manual (P/N RV99_02–01.E)

• 11,798-page OEM workshop-manual PDF, Isuzu PubNo. RV99_02-01.E, organized into separate 1998/1999, 2000, and 2002 UBS modules for US-version and right-hand-drive export configurations.
• Engine repair coverage includes 6VD1 and 6VE1 gasoline engines, 4JG2 naturally aspirated and turbo diesels, and the 4JX1, with engine removal, cylinder-head work, timing service, internal inspection, and reassembly procedures.
• Transmission and driveline sections cover 4L30-E and AW30-40LE automatics, AR-5 and MUA manuals, clutch service, front and rear differentials, Shift-on-the-Fly and TOD controls, and standard and TOD transfer cases.
• Chassis procedures address wheel alignment, power-steering tests and bleeding, steering-gear and pump repair, torsion-bar front and coil-spring rear suspension, ABS diagnosis, hydraulic brake service, and parking-brake adjustment.
• HVAC material includes manual and full-automatic climate control, refrigerant recovery and charging, sensor and actuator diagnosis, plus bench repair of DKV-14D, DKS-15CH, and HD6 compressors.
• Electrical and body-system diagnostics provide circuit diagrams, connector and component locations, cable-harness routing, fault charts, SRS service, lighting, instruments, locks, seats, sunroof or convertible-top systems, and cruise control.

This factory publication covers the Isuzu UBS/Trooper at whole-vehicle workshop level, not only the heating and air-conditioning system. The year modules are discrete; there is no separate 2001 workshop module in the PDF. Its bench-overhaul procedures, Tech 2 diagnostics, refrigerant-recovery requirements, and factory special-tool callouts make it best suited to professional technicians and experienced owners with appropriate workshop equipment.

Powertrain and Chassis Repair

The gasoline-engine chapters cover cylinder heads and valve gear, camshafts, crankshaft and main bearings, pistons and connecting rods, lubrication components, cooling, fuel delivery, ignition, starting and charging, and driveability diagnosis. Diesel coverage adds the 4JG2-NA and 4JG2-Turbo systems, while the 4JX1 material includes the turbocharger, timing gear, valve-clearance adjustment, oil rail and injectors, engine-speed control, and electronic fault diagnosis. The 2002 module separates 6VE1 8-bit and 32-bit control-system material.

Automatic-transmission content extends from preliminary checks, DTC retrieval, stall, line-pressure, and road testing through transmission removal and internal repair. The AW30-40LE section includes clutch and brake operation, valve-body work, major-component disassembly, individual clutch-pack inspection, and final reassembly. Axle and four-wheel-drive chapters cover 220 mm and 244 mm rear differentials, limited-slip units, pinion setup, propeller shafts, TOD clutch packs, shift-control shafts, and front-axle vacuum and electrical controls.

Steering and suspension work includes caster, camber, toe, trim-height, and steering-angle adjustment; power-steering pressure testing, flushing, and bleeding; steering-column and linkage repair; and removal and inspection of control arms, ball joints, torsion bars, coil springs, trailing links, and stabilizers. Brake sections add EHCU, wheel-speed-sensor, G-sensor, master-cylinder, booster, caliper, drum-brake, bleeding, and ABS fault-isolation procedures.

Diagnostics, Wiring, and Climate Control

Representative diagnostic references include the full-automatic A/C circuit and block diagrams, TOD circuit diagram and basic diagnostic flow chart, RHD ABS circuits for 4JX1 and 6VE1 configurations, AW30-40LE control-system and wiring diagrams, fuse-block circuits with harness-routing views, and SRS component and wiring-location views.

The automatic climate-control chapter contains a 12-page circuit-diagram run, self-diagnosis routines, and separate checks for the in-car, ambient, and sun sensors; intake, mix, and mode actuators; fan control; and magnetic-clutch circuits. On-vehicle repair coverage includes the compressor, condenser and fan, receiver/drier, pressure switches, evaporator, expansion valve, refrigerant lines, electronic thermostat, and rear cooler. The compressor-overhaul section supplies model-specific disassembly, inspection, clutch and shaft-seal service, reassembly, oil specifications, dimensions, and service limits.

Specifications and Workshop References

Standard and severe-use maintenance schedules identify engine, transmission, transfer-case, and differential service requirements. Component chapters provide torque tables, fluid capacities, pressure-test data, electrical test values, wear limits, clearances, adjustment specifications, and special-tool listings. Examples include the ACR4 refrigerant service unit 5-8840-0629-0 / J-39500-A, pinion-flange holder 5-8840-2157-0, and pinion oil-seal installer 9-8522-1275-0.

Compressor PAG oil is model-specific; mixing the specified oils can cause poor lubrication and compressor seizure. The cooling section also warns that the 1998 6VE1 fan and belt arrangement is not interchangeable with earlier 6VD1 hardware, since an incorrect fan can reverse airflow, reduce A/C performance, and raise coolant temperature.

Refrigerant must be recovered with approved equipment before the A/C circuit is opened, and the SRS component and wiring-location procedures must be followed before working near airbag components or related wiring.