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 MANUALSMAZDA1991929 BASEREPAIR AND DIAGNOSISENGINE PERFORMANCETHEORY AND OPERATIONENGINE CONTROLS - THEORY & OPERATION
1991 Mazda 929 Base
Engine Controls - Theory & Operation
1991 Mazda 929 BaseSECTION Engine Controls - Theory & Operation
- Introduction
- Air Induction System
- Computerized Engine Controls
- Electronic Fuel Injection
- Feedback Carburetor (B2200)
- Electronic Fuel Injection Control Unit
- Feedback Carburetor (B2200) Control Unit
- Input Devices - Electronic Fuel Injection
- Notes
- Air Conditioning Switch
- Air Charge Temperature (ACT) Sensor (Navajo)
- Airflow Meter Inlet Air Temperature Sensor
- Airflow Meter (Vc)
- Airflow Meter (Vs)
- Airflow Sensor (B2200, B2600i & MPV 2.6L)
- Atmospheric Pressure Sensor
- Barometric Pressure (BP) Sensor (Navajo)
- Brake Light Switch
- Coolant Thermosensor
- Coolant Temperature Switch
- Crank Angle Sensor (Miata)
- Distributor Signal
- EGR Position Sensor (929)
- Electrical Load Control/CPU
- Engine Coolant Temperature (ECT) Sensor (Navajo)
- Heated Exhaust Gas Oxygen (HEGO) Sensor (Navajo)
- Idle Switch
- Ignition Coil
- Ignition Switch
- Ignitor (3.0L)
- Inhibitor Switch (A/T)
- Intake Air Thermosensor (Dynamic Chamber - 2.6L & 3.0L)
- Knock Sensor (MX-6, 626 & 929S)
- Mass Airflow (MAF) Sensor (Navajo)
- Main Relay
- Neutral/Clutch Switch (M/T)
- Oxygen (O2) Sensor
- Throttle Position Sensor
- Vehicle Speed Sensor (VSS) (Navajo)
- Input Devices - Carburetor (B2200)
- Output Signals - Electronic Fuel Injection
- Notes
- A/C Cut-Out System
- By-Pass Air Control (BAC) Valve
- CHECK ENGINE Light
- Heated Oxygen (O2) Sensor Element
- Idle Speed Control (ISC) Valve
- Ignition Timing Advance Control
- Fuel Pump Relay
- Triple Induction Control System Solenoid
- Variable Inertia Charging System Solenoid
- Variable Resonance Induction System Solenoid
- Wastegate Solenoid
- Output Signals Carburetor (B2200)
- Fuel System
- Ignition Systems
- Emission Systems
- Deceleration Control System (B2200 CARBURETED)
- Exhaust Gas RECIRCULATION (EGR) Control
- Fuel Evaporation System
- Hot Idle Compensation System (B2200 CARBURETED)
- Reed Valve Air Injection (B2200 CARBURETED)
- Thermostatic Air Cleaner (B2200 CARBURETED)
- Evaporative Emission Control
- Positive Crankcase Ventilation (PCV)
- Self Diagnostic System
- Miscellaneous Controls
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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.