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 MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 112 (ENGINE CONTROL SYSTEM SELF DIAGNOSTICS)
2004 Toyota Celica GT, Standard
Section 112 (Engine Control System Self Diagnostics)
2004 Toyota Celica GT, StandardSECTION Section 112 (Engine Control System Self Diagnostics)
WARNING: This page is about a different car, the 2003 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
- Introduction
- Self-Diagnostic System
- Programming
- Scan Tool Problems
- Summary
- Diagnostic Trouble Code Definitions
- Diagnostic Tests
- Notes
- DTC P0100: Mass Airflow Meter Circuit
- DTC P0101: Mass Airflow Meter Circuit Range/Performance
- DTC P0110: Intake Air Temperature Sensor Circuit
- DTC P0115: Engine Coolant Temperature Sensor Circuit
- DTC P0116: Engine Coolant Temperature Sensor Circuit Range/Performance
- DTC P0120: Throttle Position Sensor Circuit
- DTC P0121: Throttle Position Sensor Circuit Range/Performance
- DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control
- DTC P0128: Thermostat Malfunction
- DTC P0136: Heated Oxygen Sensor Circuit (Bank 1 Sensor 2) Or DTC P0156: Heated Oxygen Sensor Circuit (Bank 2 Sensor 2)
- DTC P0141: Heated Oxygen Sensor Heater Circuit (Bank 1 Sensor 2) Or DTC P0161: Heated Oxygen Sensor Heater Circuit (Bank 2 Sensor 2)
- DTC P0171: System Too Lean (Bank 1), DTC P0172: System Too Rich (Bank 1), DTC P0174: System Too Lean (Bank 2) Or DTC P0175: System Too Rich (Bank 2)
- DTC P0300, DTC P0301, DTC P0302, DTC P0303 &/Or DTC P0304
- DTC P0325: Knock Sensor Circuit
- DTC P0335: Crankshaft Position Sensor "A" Circuit Malfunction Or DTC P1335: Crankshaft Position Sensor "A" Circuit Malfunction (During Engine Running)
- DTC P0340: Camshaft Position Sensor Circuit
- DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1) &/Or P0430: Catalyst System Efficiency Below Threshold (Bank 2)
- DTC P0440: Evaporative Emission Control System Malfunction & P0442: EVAP Emission Control System Leak Detected (Small Leak)
- DTC P0441: EVAP Emission Control System Incorrect Purge Flow Or P0446: EVAP Emission Control System Vent Control Circuit
- DTC P0450: EVAP Pressure Sensor Circuit Malfunction & P0451: EVAP Pressure Sensor Range/Performance
- DTC P0500: Vehicle Speed Sensor Circuit
- DTC P0505: Idle Control System Malfunction
- DTC P1130: A/F Sensor Circuit (Bank 1 Sensor 1) Or DTC P1150: A/F Sensor Circuit (Bank 2 Sensor 1)
- DTC P1133: Air/Fuel Sensor Circuit Response Malfunction (Bank 1 Sensor 1) & DTC P1153: Air/Fuel Sensor Circuit Response Malfunction (Bank 2 Sensor 1)
- DTC P1135: Air/Fuel Sensor Heater Circuit (Bank 1 Sensor 1) & P1155: Air/Fuel Sensor Heater Circuit (Bank 2 Sensor 1)
- DTC P1300, DTC P1305, DTC P1310 & DTC P1315
- DTC P1346: Variable Valve Timing Sensor/Camshaft Position Sensor Circuit Range/Performance Problem
- DTC P1349: Variable Valve Timing System Malfunction
- DTC P1520: Stoplight Switch Signal Circuit Malfunction
- DTC P1600: Engine Control Module Batt Circuit
- DTC P1656: Oil Control Valve Circuit Malfunction (Bank 1)
- DTC P1780: Park/Neutral Position Switch Circuit
RENDER: 1.0x
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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.