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.
1987 Mazda 626 BaseFACTORY OEM SERVICE PROCEDURE
Fuel INJ - MPFI System
- Description
- Operation
- Diagnosis
- Test Equipment & Hook-Up
- Reading Trouble Codes
- Diagnostic Procedure
- Notes
- Code 1 (Ignition Pulse)
- Code 2 (Airflow Meter)
- Code 3 (Coolant Thermosensor)
- Code 4 (Intake Air Temperature Sensor)
- Code 5 (Feedback System)
- Code 6 (Atmospheric Pressure Sensor - 323)
- Code 6 (Throttle Position Sensor - 626 & 626 Turbo)
- Code 8 (EGR Position Sensor - 626 Turbo)
- Code 9 (Atmospheric Pressure Sensor - 626 & 626 Turbo)
- Code 22 (No. 1 Cylinder Sensor - 626 Turbo)
- Testing
- Airflow Meter (AFM)
- Atmospheric Pressure Sensor
- Brake Switch
- Coolant Temperature Switch
- Coolant THERMOSENSOR
- Clutch Switch
- Electronic Control Unit
- Inhibitor Switch
- Intake Air Temperature Sensor
- Main Relay
- Neutral Switch
- No. 1 Cylinder Sensor
- Oxygen Sensor
- Pressure Switch
- Knock Sensor
- Power Steering Switch
- Shift Indicator Light
- Throttle Position Sensor
- 5TH Gear Switch
- Control Unit Testing
- Wiring Diagrams
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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