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 MANUALSTOYOTA1999CELICA 2D CONVERTIBLE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM SELF-DIAGNOSTICS
1999 Toyota Celica 2D Convertible, Standard
Engine Control System Self-Diagnostics
1999 Toyota Celica 2D Convertible, StandardSECTION Engine Control System Self-Diagnostics
- Diagnostic Trouble Code Definitions
- Diagnostic Tests
- Notes
- DTC P0105: Manifold Absolute Pressure (Map)/Barometric Pressure Sensor Circuit
- DTC P0106: Manifold Absolute Pressure (Map)/Barometric Pressure Sensor Circuit Range/Performance
- DTC P0110: Intake Air Temperature (IAT) Sensor Circuit
- DTC P0115: Engine Coolant Temperature (ECT) Sensor Circuit
- DTC P0116: Engine Coolant Temperature (ECT) Sensor Circuit Range/Performance
- DTC P0120: Throttle Position (TP) Sensor Circuit
- DTC P0121: Throttle Position (TP) Sensor Circuit Range/Performance
- DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control
- DTC P0130: Oxygen Sensor No. 1 Circuit
- DTC P0133: Oxygen Sensor No. 1 Circuit Slow Response
- DTC P0136: Oxygen Sensor No. 2 Circuit
- DTC P0171 Or P0172: System Too Lean/Rich
- DTC P0300: Random Misfire Detected
- DTCS P0301-P0304: Cylinders No. 1-4 Misfire Detected
- DTC P0325: Knock Sensor Circuit
- DTC P0335 Or P1335: Crankshaft Position (CKP) Sensor Circuit
- DTC P0336: Crankshaft Position (CKP) Sensor Circuit Range/Performance
- DTC P0340: Camshaft Position (CMP) Sensor Circuit
- DTC P0401: Insufficient Exhaust Gas RECIRCULATION (EGR) Flow Detected
- DTC P0402: Excessive Exhaust Gas RECIRCULATION (EGR) Flow Detected
- DTC P0420: Catalyst System Efficiency Below Threshold
- DTC P0440: Evaporative Emission Control System
- DTC P0441: Incorrect EVAP Purge Flow, Or DTC P0446: EVAP Vent Control Circuit
- DTC P0450: EVAP Pressure Sensor Circuit, Or DTC P0451: EVAP Pressure Sensor Range/Performance
- DTC P0500: Vehicle Speed Sensor Circuit
- DTC P0505: Idle Air Control (IAC) System Circuit
- DTC P1300: IGNITOR Circuit
- DTC P1335: Crankshaft Position (CKP) Sensor Circuit
- DTC P1520: Stoplight Switch Signal Circuit (A/T Only)
- DTC P1600: ECM Batt Circuit
- DTC P1780: Park/Neutral Position (PNP) Switch Circuit
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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.