1991 Nissan 240SX service and repair manual — a detailed, factory-style reference for maintenance, diagnostics, and repair. Use it to confirm correct procedures, specifications, and system coverage before you start work.
Designed for technicians and DIY owners, this manual helps you troubleshoot accurately, follow step-by-step repair procedures, and reference wiring diagrams and system sections quickly while you work.
What’s included
- Step-by-step repair procedures and service information
- Specifications and reference data (where provided)
- Wiring diagrams and electrical sections
- Powertrain, brakes, steering, suspension, HVAC and more
Trims covered
- LE Hatchback 2-Door
- SE Hatchback 2-Door
- SE Coupe 2-Door
- Base Coupe 2-Door
- Base Hatchback 2-Door
Engines covered
- 2.4L 2389CC l4 GAS DOHC Naturally Aspirated
Index / Table of contents
- Body
- Brakes
- Chassis Electrical
- Driveline
- Engine Cooling
- Engine Electrical
- Engine Mechanical
- Engine Performance & Emission Controls
- Fuel System
- General Information & Identification
- Heating, Ventilation, & Air Conditioning
- Hybrid & Electric Vehicle Systems
- Steering
- Suspension
- Transmission, Clutch, & Transfer Case
- Wiring Diagrams
THE FRONT SAFETY BELT BUCKLE RELEASE BUTTONS CAN BREAK. THESE RED PLASTIC RELEASE BUTTONS ARE MARKED "PRESS." IF A BUTTON BREAKS, PIECES CAN FALL INTO THE BUCKLE ASSEMBLY CAUSING THE BUCKLE TO OPERATE
THE SAFETY BELTS WOULD NOT PROVIDE ADEQUATE PROTECTION TO AN OCCUPANT IN A VEHICLE CRASH.
OWNERS SHOULD PROMPTLY CHECK THE CONDITION AND OPERATION OF BOTH FRONT SAFETY BELT BUCKLES AND CAREF
DIAGNOSIS OF VEHICLE PULL (DRIFT) AND/OR STEERING WHEEL OFF-CENTER This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
SILICONE-BASED LUBRICANT OR GREASE CAN DAMAGE ELECTRICAL COMPONENTS SERVICE INFORMATION Do not apply Silicone-based lubricants or grease to, or around, any interior electrical components. To avoid the risk of death or severe personal injury
12 VOLT BATTERY TESTING FOR IN-SERVICE VEHICLES SERVICE INFORMATION The following Service Information lists NNA procedural recommendations for establishing good connections while performing 12V battery testing. These recommendations are exp
INTELLIGENT KEY REPLACEMENT OR SWAPPING BETWEEN VEHICLES This bulletin has been amended. See AMENDMENT HISTORY on the last page. Discard all previous versions of this bulletin.
VEHICLE KEY NOT DETECTED / AUTHENTICATED, ENGINE WILL NOT START This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
REMOVING FOREIGN MATERIAL FROM THE WINDOW GLASS This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
WINDSHIELD CRACKING This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
WHEEL BEARING COLLISION DAMAGE This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
Showing the 8 most recent of 19 technical service bulletins on file with NHTSA.
TL* THE CONTACT OWNS 1991 NISSAN 240 SX. THE CONTACT STATED THAT THE SEAT BELT WAS INOPERABLE. HE CONTACTED A LOCAL DEALER AND THE MANUFACTURER AND THEY BOTH DIAGNOSED THAT THE CONTROL MODULE WOULD NE
ON COLD START-UP, BLACK SMOKE EMITTED FROM THE EXHAUST. *JB
THE LAP BELT UNBUCKLES WHEN PRESSURE IS APPLIED SUCH AS HARD BRAKING WHERE THERE IS STRESS PLACED ON THE COUPLING. *MJS
NEED ALL INJECTORS TO BE REPLACED...WAS INFORMED THAT LEAKY INJECTORS MAY CAUSE FIRE. *AK
THE AUTOMATIC TRANSMISSION UNEXPECTEDLY STOPPED WORKING WHILE I WAS DRIVING THE VEHICLE. NO ACCIDENTS OR INJURIES RESULTED, BUT THIS COULD EASILY HAVE OCCURRED UNDER DIFFERENT CIRCMSTANCES. WHEN I B
Showing the 5 most serious of 9 complaints filed with NHTSA.
