Subaru Legacy & Outback 2001–2002 H6 Service Manual Supplement (P/N G2281GE)

Fuji Heavy Industries published this factory H6 service manual supplement (P/N G2281GE) for BE-series Legacy sedans and BH-series wagons, including Outback, from the 2001 model year. The dedicated engine repair and diagnostic chapters cover the Outback H6. Four-cylinder coverage includes specifications, scheduled maintenance, and selected wiring.

Searchable Chapters and Wiring Diagrams

Text search, bookmarks, and diagram detail — All 24 PDFs have searchable chapter text and embedded bookmarks. The wiring diagrams are images, so text search skips the labels inside them. Zoom in to read small pin numbers, connector IDs, and wire color codes on dense schematics.

The ZIP contains 1,130 pages across 24 printable PDFs. General information and maintenance account for 104 pages, rear suspension for 32, and the other H6 engine chapters for 305. Engine Diagnostics spans 327 pages in two files, and Wiring System spans 362 pages in nine files. These counts include 48 cover and title pages, 62 memo pages, and three pages with section headers only.

H6 Overhaul, Fault Tracing, and Rear Suspension

These selected highlights focus on workshop procedures. The supplement also covers accelerator pedal and cable service and includes immobilizer wiring diagrams.

• H6 mechanical repair — Step-by-step procedures for engine removal and installation, timing-chain service, camshaft and cylinder-head work, cylinder-block inspection, and reassembly.

• Fuel and emissions — Fuel pressure checks, injector and fuel pump service, intake and induction work, and removal and installation of catalytic converters and oxygen sensors.

• Cooling, lubrication, and electrical service — Main and sub fan circuit diagnosis, water pump and thermostat service, oil pump inspection, and starter and generator testing.

• Engine diagnostics — Subaru Select Monitor and OBD-II scan-tool procedures, ECM and TCM signal data, no-start diagnosis, and trouble-code charts.

• Rear suspension — Sedan, wagon, and Outback alignment, plus service procedures for the stabilizer, rear arm, suspension links, shock absorbers, bushings, and subframe.

• Wiring and harnesses — Power and ground distribution, H6 engine and automatic transmission control schematics, Vehicle Dynamic Control, air conditioning, and left- and right-hand-drive connector locations.

Subaru wrote this supplement for service personnel and experienced mechanics who carry out component disassembly, adjustment, and circuit-level diagnosis.

H6 Timing, Valve Train, and Engine Systems

The mechanical section includes compression, idle-speed, ignition-timing, and valve-clearance checks, plus separate troubleshooting for engine-condition faults and abnormal noise. Timing Chain Assembly drawings show sprocket indexing, chain marks, and tensioner positioning. The overhaul procedures cover the crankshaft pulley and sprocket, front and rear chain covers, and camshaft sprockets. Valve-clearance adjustment includes shim selection and use of the 18329AA000 shim replacer. Other tools include the 18232AA000 engine stand, 18231AA000 camshaft sprocket wrench, and 18252AA000 crankshaft socket.

Fuel-system procedures cover the throttle body, intake manifold, fuel tank, level sensors, filter, and delivery, return, and evaporation lines. The chapters also cover EGR and purge controls, ignition coils, the radiator, the oil pressure relief valve, and battery inspection. Subaru cautions that an incorrect ECM can damage the fuel-injection system and that forcing an oxygen sensor loose from a cold exhaust can damage the pipe.

Circuit Tests and Automatic Transmission References

The diagnostic files cover more than 100 trouble codes through test charts or cross-references. They include a technician interview checklist, electrical-component locations, the data link connector, code retrieval and memory clearing, inspection mode, and forced output checks for the fuel pump and radiator fan relays. The code charts, ECM and TCM pin data, and matching schematics let a technician trace a fault through the circuit to a connector before replacing a module.

The H6 engine electrical, A/T control, and radiator fan schematics distinguish left- and right-hand-drive layouts. The wiring section also identifies H4, OBD and non-OBD, Outback, VDC, and pneumatic suspension variants where applicable. Harness views locate connectors from the engine bay and bulkhead to the instrument panel, doors, rear body, trunk, and rear gate.

For internal automatic transmission repair, Subaru lists the separate Automatic Transmission Service Manual, Pub. No. G0853ZE. This supplement provides A/T control wiring, TCM signal data, transmission-related trouble-code references, ATF maintenance, and fluid specifications.

Rear Alignment and Scheduled Maintenance

The rear suspension chapter includes component drawings, alignment checks, and a diagnostic table. It identifies the 927380002 wheel alignment adapter and 20099AE-series bushing installers and removers. The general section includes normal- and severe-use maintenance schedules, procedures for ATF and differential oil service, and brake pad and disc inspection. Identification tables explain body, engine, transmission, and rear differential codes and list VIN model-year identifiers for 2001 and 2002.

Engine lifting, fuel-system pressure relief, hot exhaust work, SRS circuits, and suspension service require appropriate shop equipment and safety procedures. Use a qualified technician when a job exceeds your training or tools.

Sample H6 Compression and Timing-Chain Specifications

For a warmed-up H6 cranked at 350 rpm with the throttle fully open, the compression inspection lists a standard range of 185–213 psi and a service limit of 164 psi. The timing-chain installation section specifies 8.4–8.6 mm of clearance between the right-hand and center chain guides.