Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1991 Acura Legend Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Engine Controls - System/Component Tests
- Introduction
- Air Induction Systems
- Engine Sensors & Switches
- Relays & Solenoids
- Fuel Delivery System
- Idle Control System
- Notes
- Air Conditioning Signal
- Alternator Fr Signal
- Automatic Transmission Shift Position Signal
- Brake Switch Signal
- Clutch Signal Switch
- Electronic Air Control Valve (EACV) System
- EACV
- Fast Idle Valve
- Manual Transmission Neutral Switch
- Power Steering (P/S) Oil Pressure Signal
- Starter Signal
- Additional Sensors & Switches Inputs
- Ignition System
- Timing Control System
- Emission Systems & Sub-Systems
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.