Nissan Stanza U12 1991 Service Manual (P/N SM1E-0U12U0)

Nissan factory service manual for the 1991 Stanza U12 Series sedan, covering E and GXE grades with the KA24E engine for Non-California, California, and Canadian specifications. P/N SM1E-0U12U0, August 1990 edition, includes maintenance, diagnosis, and repair procedures across the vehicle.

PDF Format and Navigation

Text search and diagram viewing: PDF text search is unavailable. Four embedded bookmarks point to the opening page and closing reference chart; individual chapters are not bookmarked. Small wiring labels require zooming, especially in the reduced overall circuit diagram.

One printable, English-language 984-page PDF, including two opening pages, 14 blank pages, a conversion-table page, and the closing quick-reference chart.

Engine, Drivetrain, and Vehicle-System Repair

The following selected coverage highlights outline the main workshop areas rather than reproduce the full contents. Additional topics include accelerator-control adjustment and fuel-tank and exhaust-system service.

• Engine repair: Compression testing, timing-chain service, oil-seal replacement, cylinder-head repair, engine removal, cylinder-block disassembly, bearing selection, and assembly inspections.
• Engine management: E.C.C.S. self-diagnosis, CONSULT work support and active tests, symptom-based troubleshooting, sensor checks, fuel-injection inspection, and emission-control testing.
• Clutch and transaxles: Hydraulic clutch service, manual-transaxle overhaul and preload adjustment, automatic-transaxle diagnosis, pressure testing, internal repair, and final-drive service.
• Axles, suspension, and brakes: Wheel-hub and drive-shaft repair, strut service, alignment checks, disc and drum brakes, hydraulic bleeding, and ABS troubleshooting.
• Power steering: PR26SC steering-gear removal, disassembly, inspection, assembly, adjustment, and power-steering oil-pump service.
• Body and electrical systems: Door and window mechanisms, automatic seat belts, starting and charging systems, cruise-control diagnosis, harness layouts, and wiring diagrams.
• Heating and air conditioning: Refrigerant recovery, evacuation, charging, leak checks, compressor-clutch service, and push-control and blower-circuit diagnosis.

This manual is suited to technicians and experienced owners familiar with mechanical repair and electrical testing; internal overhaul and A/C work require the specified tools and equipment.

KA24E Engine Repair and Workshop Preparation

The engine material is detailed enough for internal repair work rather than routine maintenance alone. Inspection tables cover pistons, connecting rods, crankshaft journals, valve components, and bearing clearances, with standard dimensions and wear limits.

Timing and fasteners: The timing-chain section shows sprocket alignment and tensioner installation. Cylinder-head fasteners use a staged torque/angle procedure, and Nissan's angular-tightening precautions distinguish that method from reference torque figures.

Lubrication and cooling: Oil-pressure testing, oil-pump clearances, regulator-valve inspection, thermostat testing, and radiator service are supported by the Lubrication Circuit and Cooling Circuit drawings. Water-pump coverage concerns removal, inspection, and replacement as a unit rather than internal rebuilding.

Special service tools are identified by number and intended operation, including the KV101092S0 valve spring compressor, KV109B0010 valve oil seal drift, KV10111100 seal cutter, ST25051001 oil pressure gauge, and EG11160000 ignition coil adapter harness. That information is especially useful when planning cylinder-head, lubrication-system, or E.C.C.S. work before disassembly begins.

Prying between the oil pan and block with a screwdriver can deform the sealing flange, while incorrect cylinder-head bolt removal can cause warpage or cracking. Turning the crankshaft and camshaft independently with the timing chain removed can cause valve-to-piston contact.

For engine removal, fuel-system work, cooling-system pressure checks, and electrical diagnosis, follow the factory precautions for vehicle support, fuel-pressure release, hot coolant, and battery or control-unit isolation.

E.C.C.S. Fault Diagnosis

The electronic engine-control material documents the Nissan E.C.C.S. architecture rather than treating fuel injection as a black box. Component descriptions explain the control unit, crank-angle sensor, air-flow meter, engine-temperature sensor, throttle sensor and soft/hard idle switch, exhaust-gas sensor, and vehicle-speed sensor.

Related sections explain injector, fuel-pressure regulator, power-transistor, A.A.C. valve, E.G.R., swirl-control, fuel-pump, radiator-fan, and fail-safe operation.

CONSULT coverage extends from ECU part-number reading and data monitoring to work support and active tests. Separate diagnostic paths address hard starting, unstable idle, hesitation, stalling, and loss of power. These connect symptoms with circuit and component checks, helping distinguish a sensor fault from a power-supply, ground, or harness problem before parts are selected.

The E.C.C.S. System Diagram, Vacuum Hose Drawing, Circuit Diagram, and Wiring Diagram support those checks. General diagnostic instructions explain connector views, harness-side versus terminal-side identification, and continuity testing.

Manual and Automatic Transaxle Overhaul

Step-by-step procedures extend to gear and synchronizer inspection, shaft disassembly, differential service, and bearing-preload adjustment in the manual transaxle.

Automatic-transaxle coverage combines CONSULT and self-diagnostic procedures with road tests, shift schedules, line-pressure checks, and lock-up testing. Internal repair sections address the oil pump, control valve, clutch packs, brakes, and final drives with and without viscous coupling. Shift-lock diagnosis has its own circuit checks.

Chassis, Body, and Electrical Diagnosis

ABS troubleshooting includes warning-lamp self-diagnosis, wheel-sensor checks, actuator and relay tests, connector locations, and a Circuit Diagram for Quick Pinpoint Check.

Body coverage extends to power windows, power door locks, automatic seat belts, sunroof mechanisms, glass, and body-alignment measurements. Electrical sections include starter and alternator repair, lighting and instrument circuits, time-control diagnosis, A.S.C.D. cruise control, and Super Multiple Junction connector information.

R12 Air Conditioning and Push Controls

The A/C procedures apply to the R12 system and ATSUGI NVR 140S compressor. Coverage includes compressor-oil adjustment, clutch replacement and inspection, refrigeration-system performance checks, and electrical diagnosis of the push controls, door motors, and blower circuit.

Selected Bearing-Clearance and Oil-Pressure Data

For the KA24E, standard main-bearing clearance is 0.020–0.047 mm, with a 0.10 mm limit. Standard connecting-rod bearing clearance is 0.010–0.035 mm, with a 0.09 mm limit. These appear in the engine inspection specifications used during internal repair.

The lubrication section specifies an approximate oil pressure of 412–481 kPa at 3,000 rpm with the engine at normal operating temperature and running under no load.