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.
1997 Mazda MX-5 Miata Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Engine Controls - Tests W/Codes
- Introduction
- Self-Diagnostic System
- Connector Identification
- Circuit Tests
- Notes
- DTC P0100 - Mass Air Flow (MAF)/Volume Air Flow (VAF) Sensor Circuit Malfunction
- DTC P0110 - Intake Air Temperature (IAT) Sensor Circuit Malfunction
- DTC P0115 - Engine Coolant Temperature (ECT) Sensor Circuit Malfunction
- DTC P0120 - Throttle Position (TP) Sensor Circuit Malfunction
- DTC P0125 - Excessive Time To Enter Closed Loop
- DTC P0130 - Front Heated Oxygen Sensor Malfunction
- DTC P0134 - Front Oxygen Sensor Insufficient Activity Detected
- DTC P0135 - Front Oxygen Sensor Heater Malfunction
- DTC P0140 - Rear Oxygen Sensor Activity Not Detected
- DTC P0141 - Rear Oxygen Sensor Heater Malfunction
- DTC P0170 - Bank No. 1 Fuel Trim Malfunction
- DTC P0300 - Random Misfire Detected
- DTC P0301 - Cylinder No. 1 Misfire Detected
- DTC P0302 - Cylinder No. 2 Misfire Detected
- DTC P0303 - Cylinder No. 3 Misfire Detected
- DTC P0304 - Cylinder No. 4 Misfire Detected
- DTC P0335 - Crankshaft Position Sensor Circuit Malfunction
- DTC P0340 - Camshaft Position Sensor Circuit Malfunction
- DTC P0400 - EGR Flow Malfunction
- DTC P0404 - EGR Range/Performance Malfunction
- DTC P0420 - Bank No. 1 Catalytic Converter Efficiency Below Limit
- DTC P0441 - EVAP System Malfunction
- DTC P0443 - EVAP System - Purge Control Valve Circuit Malfunction
- DTC P0470 - Exhaust Pressure Sensor Malfunction
- DTC P0500 - Vehicle Speed Sensor (VSS) Malfunction
- DTC P0505 - Idle Control System Malfunction
- DTC P0510 - Closed Throttle Position Switch Malfunction
- DTC P0703 - Brake Switch Malfunction
- DTC P1170 - Front Oxygen Sensor Activity Not Detected
- DTC P1195 - EGR Boost Sensor Barometric Pressure Signal Malfunction
- DTC P1250 - Pressure Regulator Control (PRC) Solenoid Valve Malfunction
- DTC P1345 - Camshaft Position Sensor No SGC Signal
- DTC P1402 - EGR Valve Position Sensor (EGRS) Open Or Short Circuit
- DTC P1485 - EGR Solenoid Valve (Vacuum) Open Or Short Circuit
- DTC P1486 - EGR Solenoid Valve (Vent) Open Or Short Circuit
- DTC P1601 - Communication Line Error (Automatic Transmission)
- DTC P1608 - Engine Control Module (CPU) Malfunction
- DTC P1794 - Battery Supply Circuit Malfunction
- DTC P1797 - Transmission Range Switch (A/T) Or Neutral/Clutch Switch Malfunction
- Summary
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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