1990 INFINITI Q45 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.
Built for technicians and DIY owners, this manual helps you troubleshoot accurately, follow step-by-step repair procedures, and use wiring diagrams and system sections to diagnose problems faster.
What’s included
- Step-by-step repair procedures and service information
- Specifications and reference data (where provided)
- Electrical coverage with wiring diagrams
- Coverage across key systems: engine, transmission, brakes, steering, suspension, HVAC, and more
Trims covered
- Base Sedan 4-Door
Engines covered
- 4.5L 4494CC V8 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
WHEEL BEARING COLLISION DAMAGE 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.
INFINITI: VENT CONTROL VALVE REPLACEMENT. NO APPLIED VEHICLES AFFECTED: ALL MODELS; NO MODEL YEARS LISTED. *PE
INFINITI: SRS PRECAUTIONS DURING SERVICE. INCLUDED IN THE RESTRAINTS SECTION OF THE ELECTRONIC SERVICE MANUAL (ESM) FOR EACH VEHICLE IS INFORMATION NECESSARY TO SERVICE THE SUPPLEMENTAL RESTRAINT SYSTEM (SRS) SAFELY. IMPROPER MAINTENANCE, I
INFINITI: TIRE PRESSURE MONITORING SYSTEM (TPMS) WARNING LIGHT ON/BLINKING. NO MODELS OR MODEL YEARS LISTED. *PE UPDATED ON 08-11-2011. *KB
INFINITI: ELECTRONIC CONTROL UNIT DAMAGE CAN RESULT FROM IMPROPER BATTERY CONNECTION. THE BATTERY IS REQUIRED TO STAY CONNECTED WHEN THE ENGINE IS RUNNING. NO MODEL YEARS LISTED. *PE
1997 QX4 WHEEL BALANCE MACHINE ADAPTER KITS. *TW
Showing the 8 most recent of 10 technical service bulletins on file with NHTSA.
WHEN DRIVING VEHICLE ON UNEVEN PAVEMENT VEHICLE WILL LOOSE ITS STABILITY, SHOULDER BUMP, VEHICLE LOSS VEHICLE STABILITY IMPACT 11:00 POSITION SPEED 65 MPH. TT
RACK AND PINION STEERING FAILURE. *AK
TRANSMISSION FAILURE. *AK
THE CONSUMER HAD TO USE EXCESSIVE FORCE TO STEER THE VEHICLE. THE DEALER STATED THE POWER STEERING SYSTEM WAS LEAKING FLUID AND NEEDED TO BE SERVICED. THE PROBLEM RE-OCCURRED, AND THEN THE DEALER ST
THE CONSUMER HAD TO USE EXCESSIVE FORCE TO STEER THE VEHICLE. THE DEALER STATED THE POWER STEERING SYSTEM WAS LEAKING FLUID AND NEEDED TO BE SERVICED. THE PROBLEM RE-OCCURRED, AND THEN THE DEALER ST
Showing the 5 most serious of 33 complaints filed with NHTSA.
