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.
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HOMESERVICE MANUALSMAZDA1991626 LE, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SYSTEM/COMPONENT TESTS
1991 Mazda 626 LE, Standard
Engine Controls - System/Component Tests
1991 Mazda 626 LE, StandardSECTION Engine Controls - System/Component Tests
- Introduction
- Air Induction Systems
- Engine Sensors & Switches
- A/C Switch
- Airflow Meter/Sensor Inspection
- Brake Light Switch
- Clutch Switch (M/T)
- Coolant Temperature Switch
- Coolant THERMOSENSOR
- Crank Angle Sensor
- EGR Position Sensor
- Idle Switch
- Inhibitor Switch (A/T)
- Knock Sensor
- Neutral Switch (M/T) Test
- Oxygen Sensor (O2) Inspection
- Power Steering Pressure Switch Test
- Throttle Position Sensor
- Vehicle Speed Sensor
- Relays, Solenoids, Motors & Modules
- Fuel System
- Idle Speed Control (ISC) System
- Ignition System
- Emission Systems & Sub-Systems
- Deceleration Control System
- Exhaust Gas RECIRCULATION (EGR) System
- Fuel Evaporation
- Positive Crankcase Ventilation (PCV) System
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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.