Porsche 911 (964) Carrera 2/4 Workshop Manual Set, 1989–1994 (P/N WKD 482 520)

Carrera 4 procedures form the base, with separate Carrera 2 addenda wherever a repair differs.

Model-year coverage: Carrera 4 applications begin with Model Year 1989 and Carrera 2 applications with Model Year 1990. Transmission tables extend through 1994; wiring covers the 1989 Carrera 4 and 1990–1993 Carrera 2/4. The scheduled-maintenance section itself is labeled only through 1991.

Turbo coverage: Turbo Look appears in Carrera 2 ABS wiring; full Turbo engine and drivetrain repair are outside this Carrera 2/4 compilation.

Tiptronic diagnosis also refers to the separate Porsche Tiptronic functional-description brochure, WKD 496 620, which is not included.

PDF Volumes, Bookmarks, and Diagram Detail

Search and navigation: Workshop-page text is not searchable; text search is limited to added navigation and cover text. All seven PDFs have bookmarks, although the 1990 wiring contents bookmark in Volume 7 has no valid destination. Small pin and wire-color labels in the large-format wiring diagrams require zooming.

The ZIP contains seven printable PDFs totaling 1,299 pages, including seven added cover pages and four Carrera 2 divider pages. Factory addenda are included in the listed volume totals.

Engine, Drivetrain, Chassis, and Electrical Work

The following selected coverage highlights major workshop sections, rather than reproducing the full contents. Other included topics range from seat-heating calibration to fuel-tank sender testing.

• Engine and maintenance: Engine removal, crankcase and crankshaft work, piston and cylinder service, cylinder-head and valve-train repair, oil-pump service, and fuel-system testing.

• Manual drivetrain: G 64, Z 64, and G 50 disassembly and assembly, shaft and gear-set work, interaxle locks, limited-slip differentials, front/rear final-drive adjustment, and clutch controls.

• Tiptronic: Torque-converter service, selector and keylock/shiftlock systems, transmission teardown, hydraulic control unit, solenoid valves, internal clutch and brake packs, and mechanical/hydraulic troubleshooting.

• Chassis and brakes: Front/rear suspension, wheel carriers and bearings, spring struts, alignment, ABS/PDAS diagnosis, fixed-caliper brakes, brake/lock-control bleeding, booster pressure tests, and power-steering diagnosis.

• Body repair: 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-specific procedures.

• Heating and air conditioning: Heater/A/C unit disassembly, flap adjustment, blower replacement, refrigerant servicing, R 134a pressure/temperature charts, and climate-control fault diagnosis.

• Electrical documentation: Model-year wiring diagrams, wiring-harness repair, component and connector views, ground-point locations, and alarm-system fault-finding material.

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.

Engine Repair and DME Fault Isolation

Mechanical detail: M 64/01 service data accompany crankshaft rework dimensions, piston/cylinder identification, and M 64/01/M 64/02 camshaft identification and timing. Step-by-step procedures include engine/transmission separation and piston-pin retainer installation with tools 9500 and 9500/1; camshaft work identifies P 9191.

Diagnostic equipment: System Tester 9288, identified as the Bosch KTS 301, supports fault-memory access, actuator checks, circuit-input testing, system adaptation, knock registration, sensor/status readings, and control-unit identification. The manual also identifies flashing-code tester 9268 and tool 9540 for K/L-line checks.

The DME troubleshooting plan covers 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. Its symptom cross-reference charts, connector views, and signal patterns help distinguish wiring or sensor faults from control-unit problems before replacement parts are selected.

Component-specific tables supply torque specifications, approved fluids and capacities, pressure-test data, clearances, wear and rework limits, alignment values, and electrical test specifications.

Transmission Variants and PDAS Testing

Transmission-number guidance explains the model-year code and the change that eliminated the model letter from Model Year 1992.

Tiptronic applications separate 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. Internal repair includes clutch/brake-pack inspection, end-clearance measurement, and differential adjustment; converter removal identifies retaining tool 9325.

PDAS material distinguishes Gylon and Valeo lock discs and adjustable versus nonadjustable versions. It includes disc-wear measurement, locking-torque checks, hydraulic admission-valve tests, and checks for crossed longitudinal/transverse lock lines.

Body, Climate Control, and Wiring References

Speedster material covers folding-top and windshield removal and installation. The body section warns that significantly deformed high-strength-steel panels can crack during straightening and require replacement or sectional repair.

Climate-control diagnosis separates temperature-sensor, flap-motor, and blower faults, including index-01 regulator changes. R-12 service material is supplemented by R 134a data for systems from Model Year 1993.

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. Dedicated repair pages cover wiring harnesses No. 2 and No. 3 and DME harness No. 173; Carrera RS and Carrera 2 Turbo Look ABS sheets are identified separately.

The DME section warns that resistance testing with the ignition on can destroy the measuring device; incorrect polarity or ignition-circuit probing can damage the ignition output stage and DME control unit. Work involving high-energy ignition, airbags, refrigerant circuits, brake/PDAS hydraulics, vehicle lifting, or major drivetrain removal requires the specified isolation, recovery, lifting, and test equipment together with trained shop procedures.

A/C Charge and Sensor-Specification Preview

The A/C tables distinguish a 930 g R-12 charge from the 840 g R 134a charge specified from Model Year 1993. These belong to separate refrigerant-system specifications.

Climate-control fault finding includes temperature-dependent resistance ranges: the left and right mixing-chamber sensors are specified at 9.5–10.5 kΩ at 25°C (77°F), alongside separate evaporator, rear-blower, and oil-cooler sensor data.