1989–1994 Porsche Carrera 911, 964, Carrera 2 and Carrera 4 Service & Repair Manual (P/N WKD 482 520)

This seven-volume PDF set compiles Porsche 911 workshop-manual material for the 964-series Carrera 4 and Carrera 2. The files identify Carrera 4 applications beginning with Model Year 1989 and Carrera 2 applications beginning with Model Year 1990; transmission tables extend through Model Year 1994, while the included model-year wiring diagrams stop at Model Year 1993. Carrera 4 procedures form the base, with separate Carrera 2 addenda wherever a repair differs. The material is suited to professional technicians and advanced owners who can read Porsche wiring diagrams and operate an oscilloscope, multimeter, and factory diagnostic equipment; it assumes those skills rather than teaching basic workshop practice.

• 1,299-page PDF set - Volume 1, Engine and Maintenance: 247 pages; Volume 2, Manual Transmission: 229 pages; Volume 3, Automatic Transmission: 195 pages; Volume 4, Chassis: 183 pages; Volume 5, Body: 260 pages; Volume 6, Heating, Ventilation, Air Conditioning, and Electrics: 76 pages; Volume 7, Electrics and Wiring Diagrams: 109 pages.
• Engine and DME coverage spans M 64/01 service data, M 64/01 and M 64/02 camshaft identification and timing, engine removal, crankcase and crankshaft work, piston and cylinder service, cylinder-head and valve-train repair, oil-pump service, fuel-system testing, and DME fault isolation.
• G 64, Z 64, and G 50 manual-drivetrain sections detail transmission disassembly and assembly, shaft and gear-set work, interaxle and limited-slip differential service, front and rear final-drive adjustment, clutch controls, and PDAS diagnosis.
• A 50 Tiptronic material distinguishes the A 50/01, A 50/02, and A 50/03 applications and covers the torque converter, selector and keylock/shiftlock systems, transmission teardown, hydraulic control unit, solenoid valves, internal clutch and brake packs, differential adjustment, and mechanical/hydraulic troubleshooting.
• Chassis procedures include front and rear suspension, wheel carriers and bearings, spring struts, alignment, ABS and Porsche Dynamic All-Wheel Control testing, fixed-caliper brakes, brake and lock-control bleeding, booster pressure testing, and power-steering diagnosis.
• Body repair content addresses inspection dimensions, high-strength-steel panels, front/center/rear structural section replacement, roof and sill work, glazing, doors, bumpers, airbags, Carrera 2 RS differences, and Speedster folding-top and windshield procedures.
• Electrical documentation supplies model-year wiring diagrams, wiring-harness repair pages, component and connector views, ground-point locations, and system-specific fault-finding material for climate control and the alarm system.

Model and Drivetrain Breakdowns

The manual-transmission data separates G 64/00 and G 64/01 Carrera 4 applications from G 50/03, G 50/04, G 50/05, and G 50/10 Carrera 2, RS America, and Carrera RS applications. Transmission-number guidance explains the model-year code and the change that eliminated the model letter from Model Year 1992. Tiptronic is divided into A 50/01 for 1990-1991, A 50/02 for 1992-1994 outside the U.S., and A 50/03 for 1992-1994 U.S. cars. The scheduled-maintenance section itself is labeled only through Model Year 1991.

Diagnostic and Repair Depth

System Tester 9288, identified in the manual as the Bosch KTS 301, is covered for fault-memory access, actuator checks, circuit-input testing, system adaptation, knock registration, sensor/status readings, and control-unit identification. The DME troubleshooting plan adds test points for power supply, throttle contacts, temperature and airflow sensors, oxygen control, knock sensors, injectors, fuel pressure, intake leaks, speed/reference signals, ignition output, and K/L diagnostic lines. It also identifies flashing-code tester 9268 and special tools 9540 for K/L-line checks, 9500/9500/1 for piston-pin retainer assembly, P 9191 for camshaft work, and 9325 for torque-converter retention.

Component-specific tables provide torque specifications, approved fluids and capacities, pressure-test data, clearances, wear and rework limits, alignment values, electrical test data, and calibration or adjustment specifications. These references are tied to the applicable assemblies rather than presented as a single generic data sheet.

Wiring, Body, and Shop Cautions

Representative electrical sheets include Motor/Fuel/Ignition/Cruise Control, ABS with Porsche Dynamic AWD Control, Tiptronic, Airbag, Alarm System/Central Locks/Mirrors/Power Windows, and Plug Connections and Ground Points. The electrical volume also contains dedicated repair material for wiring harnesses No. 2 and No. 3 and DME wiring harness No. 173. Model-year schematics cover the 1989 Carrera 4 and the 1990-1993 Carrera 2/4, with Carrera RS and Carrera 2 Turbo Look ABS sheets where applicable.

The DME section warns that resistance testing with the ignition on can destroy the measuring device, while incorrect polarity or probing at the ignition circuit can damage the ignition output stage and DME control unit. The body section explains that significantly deformed high-strength-steel panels can crack during straightening and are handled as replacement or sectional-repair areas.

This is a Carrera 2/4 workshop-manual compilation, not a standalone M 64/01 specification booklet or a Turbo engine/drivetrain manual. “Turbo Look” appears as a Carrera 2 ABS wiring variant; full Turbo powertrain repair is outside this set. Work involving high-energy ignition, airbag units, the filled R 12 refrigerant system, brake/PDAS hydraulics, vehicle lifting, or major drivetrain removal requires the specified isolation, recovery, lifting, and test equipment together with trained shop procedures.