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.
1990 Mazda 929 BaseFACTORY OEM SERVICE PROCEDURE
Engine Controls - Tests W/Codes
- Self-Diagnostic System Introduction
- Retrieving Codes
- Clearing Codes
- Summary
- DOHC Code Identification Charts
- Notes
- Trouble Code Identification Table (DOHC)
- Code 1: DOHC Ignition Pulse
- Code 2: DOHC Ne Signal-Distributor
- Code 3: DOHC G1 Signal-Distributor
- Code 4: DOHC G2 Signal-Distributor
- Code 5: DOHC Knock Sensor And Knock Control Unit
- Code 8: DOHC Airflow Meter
- Code 9: DOHC Coolant THERMOSENSOR
- Code 10: DOHC Intake Air THERMOSENSOR-Airflow Meter
- Code 11: DOHC Intake Air THERMOSENSOR-Dynamic Chamber
- Code 12: DOHC Throttle Sensor
- Code 14: DOHC Atmospheric Pressure
- Code 15: DOHC Left Side Oxygen Sensor
- Code 16: DOHC EGR Position Sensor
- Code 17: DOHC Left Side Feedback System
- Code 23: DOHC Right Side Oxygen Sensor
- Code 24: DOHC Right Side Feedback System
- Code 25: DOHC Pressure Regulator Control Solenoid Valve
- Code 26: DOHC Purge Control Solenoid Valve
- Code 28: DOHC EGR Vacuum Solenoid Valve
- Code 29: DOHC EGR Vent Solenoid Valve
- Code 34: DOHC Idle Speed Control (ISC)
- Code 36: DOHC Oxygen Sensor Heater Relay
- Code 41: DOHC Variable Resonance Induction System
- SOHC Code Identification Charts
- Notes
- Trouble Code Identification Table (SOHC)
- Code 1: SOHC Ignition Pulse
- Code 2: SOHC Ne Signal-Distributor
- Code 3: SOHC G1 Signal-Distributor
- Code 4: SOHC G2 Signal-Distributor
- Code 8: SOHC Airflow Meter
- Code 9: SOHC Coolant THERMOSENSOR
- Code 10: SOHC Intake Air THERMOSENSOR-Airflow Meter
- Code 11: SOHC Intake Air THERMOSENSOR-Dynamic Chamber
- Code 12: SOHC Throttle Sensor
- Code 14: SOHC Atmospheric Pressure
- Code 15: SOHC Oxygen Sensor
- Code 16: SOHC EGR Position Sensor
- Code 17: SOHC Feedback System
- Code 25: SOHC Pressure Regulator Control Solenoid Valve
- Code 26: SOHC Purge Control Solenoid Valve
- Code 28: SOHC EGR Vacuum Solenoid Valve
- Code 29: SOHC EGR Vent Solenoid Valve
- Code 34: SOHC Idle Speed Control (ISC)
- Code 40: SOHC Triple Induction Control System & O2 Heater
- Code 41: SOHC Variable Resonance Induction Solenoid Valve
Factory Service Tools
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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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