1990 Nissan 300ZX Fairlady Z, 300ZX Turbo, 300ZX 2+2, and 300ZX 2+2 Turbo Service Manual

• Application coverage: Covers the 1990 Nissan 300ZX Z32 2+2 T-bar-roof automatic-transmission configurations identified in the factory model table: European VG30DETT twin-turbo models with the RE4R03A and Australian VG30DE non-turbo models with the RE4R01A. Both left-hand-drive and right-hand-drive electrical layouts are included where applicable. Coverage is limited to those Europe/Australia configurations; it is not blanket all-market or Japanese-market Fairlady Z coverage.
• 194-page PDF — Nissan Automatic Transmission Section AT: Documents on-vehicle service, transmission removal and installation, major overhaul, disassembly, individual component repair, assembly, adjustment, and Service Data and Specifications.
• Electronic control diagnosis: Provides CONSULT data-monitor and self-diagnosis procedures, a no-CONSULT check-lamp method, the A/T control unit connector and terminal inspection table, and electrical component-location views. Direct circuit checks cover revolution and vehicle-speed sensors, throttle and fluid-temperature inputs, shift solenoids A and B, overrun-clutch, lock-up, and line-pressure solenoids, inhibitor/overdrive/kickdown/idle switches, and the engine-rpm signal.
• Hydraulic and symptom testing: Includes fluid-condition checks, road and cruise testing, stall testing, line-pressure testing, pressure-test interpretation, shift-schedule charts, a probability-ranked symptom chart, and 20 numbered diagnostic procedures connecting operating complaints to hydraulic, electrical, and internal mechanical causes.
• Internal overhaul coverage: Details the oil pump, control valve assembly, upper and lower valve bodies, and accumulators. Internal chapters cover the reverse, high, forward, and overrun clutches; low-and-reverse brake; forward and low one-way clutches; rear internal gear and forward clutch hub; band-servo piston assembly; output shaft and planetary geartrain; and parking pawl components.
• Factory illustrations and special tools: Includes Hydraulic Control Circuits, the Electrical Control Chart, a full transmission cross-section, the Circuit Diagram for Quick Pinpoint Check, LHD/RHD wiring diagrams, and separate RE4R01A and RE4R03A oil-channel drawings and exploded overhaul views. The tool table identifies the ST2505S001 line-pressure gauge set, KV31101201 adapter, ST07870000 transmission case stand, KV31102100 torque-converter one-way-clutch check tool, ST25850000 sliding hammer, KV31102400 clutch spring compressor, and the ST33200000 and ST30720000 seal-installation drifts.

Model-specific service depth

This is not a generic RE4R-series overview. The manual separates the RE4R01A and RE4R03A wherever construction or service data changes. Dedicated pages show each transmission’s major-overhaul layout, hydraulic oil channels, needle-bearing/thrust-washer/snap-ring locations, forward-clutch drum construction, assembly differences, and Specifications and Adjustment data. The separate S.D.S. sections cover gear ratios, shift and lock-up schedules, stall and line-pressure test data, return-spring dimensions, accumulator O-ring sizing, clutch and brake plate stacks, wear limits, end play, selective retaining plates, brake-band adjustment, and component-specific torque specifications.

The diagnostic section goes beyond a basic fault-code list. It starts with a structured work flow and fluid and road-test checks, then follows the complaint through self-diagnosis and circuit testing. Together, the 20 symptom procedures and final symptom charts address no-start and range-selection faults, loss of creep, harsh engagement, missing upshifts or downshifts, failed lock-up, loss of engine braking, overheating, and related drivability complaints. The charts also distinguish checks that can be made on the vehicle from faults that require transmission removal and internal inspection.

Repair and overhaul procedures

On-vehicle work covers control-valve and accumulator access, oil-strainer inspection, solenoid and terminal-cord service, revolution-sensor replacement, rear oil-seal replacement, parking-component inspection, inhibitor-switch adjustment, and manual-control linkage adjustment. The removal and installation chapter covers the transmission assembly and the related torque-converter seating and clearance checks.

Bench repair begins with torque-converter one-way-clutch testing and continues through case disassembly, oil-pump extraction, clutch and geartrain removal, rear-extension service, band-servo and accumulator removal, and manual-shaft components. Individual repair chapters provide inspection and assembly procedures for the hydraulic pump and valve bodies as well as each clutch, brake, one-way clutch, servo, and parking mechanism. Reassembly includes selective end-play work, clutch-pack installation, brake-band adjustment, control-valve installation, inhibitor-switch setup, torque-converter installation, and the final checks required before the unit returns to service.

Valve-body repair demands careful parts control. The upper and lower bodies contain steel balls, valves, sleeves, springs, a pilot filter, and an orifice-check assembly that must return to the correct locations; the manual also maps the different bolt lengths used during reassembly. It specifically warns against magnetic tools and unprotected wire on precision valve parts because the sliding surfaces can be scratched. Oil-pump seal rings come in different diameters, and placing one in the wrong groove or spreading it too far can deform the ring and compromise hydraulic sealing.

Line-pressure and stall testing place the drivetrain under load and expose hot, pressurized ATF. The vehicle must be secured and the factory test precautions followed before carrying out those procedures.

This PDF is the automatic-transmission Section AT only. It cross-references the GI, EL, EF & EC, MA, and PD sections for general diagnostic conventions, power-supply routing, engine-control checks, fluid service, and propeller-shaft work; those full vehicle sections are outside this document’s repair scope.