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 111 (ENGINE CONTROL SYSTEM SELF DIAGNOSTICS)
2004 Toyota Celica GT, Standard
Section 111 (Engine Control System Self Diagnostics)
2004 Toyota Celica GT, StandardSECTION Section 111 (Engine Control System Self Diagnostics)
WARNING: This page is about a different car, the 2003 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
- Introduction
- Service Precautions
- Self-Diagnostic System
- Programming
- Scan Tool Problems
- Inspection Mode
- 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/Pedal Position Sensor/Switch Circuit
- DTC P0121: Throttle/Pedal Position Sensor/Switch Circuit Range/Performance
- DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control
- DTC P0128: Thermostat Malfunction
- DTC P0130: Heated Oxygen Sensor (Bank 1 Sensor1) Circuit
- DTC P0133: Heated Oxygen Sensor (Bank 1 Sensor 1) Circuit Slow Response
- DTC P0135: Heated Oxygen Sensor (Bank 1 Sensor 1) Heater Circuit Malfunction & P0141: Heated Oxygen Sensor (Bank 1 Sensor 2) Heater Circuit Malfunction
- DTC P0136: Heated Oxygen Sensor (Bank 1 Sensor 2) Circuit
- DTC P0171: System Too Lean Or DTC P0172: System Too Rich
- DTC P0300, DTC P0301, DTC P0302, DTC P0303 Or DTC P0304
- DTC P0325: Knock Sensor 1 Circuit Malfunction
- DTC P0335: Crankshaft Position Sensor Circuit
- DTC P0340: Camshaft Position Sensor Circuit
- DTC P0420: Catalyst System Efficiency Below Threshold
- DTC P0440: Evaporative Emission Control System
- DTC P0441: EVAP Emission Control System Incorrect EVAP Purge Flow Or P0446: EVAP Emission Control System Vent Control Malfunction
- DTC P0450: EVAP Emission Control System Pressure Sensor Malfunction Or P0451: EVAP Emission Control System Pressure Sensor Range/Performance
- DTC P0500: Vehicle Speed Sensor Circuit
- DTC P0505: Idle Control System Malfunction
- DTC P1125: Throttle Control Motor Circuit
- DTC P1127: Electronic Throttle Control System Actuator Power Source Circuit
- DTC P1128: Throttle Control Motor Lock Malfunction
- DTC P1129: Electronic Throttle Control System Malfunction
- DTC P1300, DTC P1305, DTC P1310 & DTC P1315
- DTC P1346: Variable Valve Timing Sensor Circuit Range/Performance
- DTC P1349: Variable Valve Timing System Malfunction
- DTC P1430: Vacuum Sensor Circuit Malfunction
- DTC P1431: Vacuum Sensor Circuit Range/Performance
- DTC P1436: By-Pass Valve Malfunction
- DTC P1437: Vacuum Line Malfunction
- DTC P1455: Fuel Tank Leak Detected
- DTC P1525: Resolver Vehicle Malfunction
- DTC P1600: Engine Control Module Batt Circuit
- DTC P1633: Engine Control Module Malfunction (Electronic Throttle Control System Circuit)
- DTC P1636: HV Ecu Malfunction
- DTC P1637: ESTP Signal Malfunction
- DTC P1656: Oil Control Valve Circuit Malfunction
- DTC P3190 Or DTC P3191
- Combination Meter Circuit Inspection
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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.