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.
NORMAL Mode Code Retrieval
2004 Toyota Celica GT, StandardSECTION NORMAL Mode Code Retrieval
WARNING: This page is about a different car, the 2002 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
- Connect scan tool to Data Link Connector (DLC) No. 3. See Figure. DLC No. 3 is located under left side of instrument panel. Turn ignition on with engine off. Turn scan tool on. Using scan tool manufacturer's instructions, check for DTCs and freeze-frame data.
- If scan tool displays UNABLE TO CONNECT TO VEHICLE, DLC No. 3 must be checked. See DLC NO. 3 INSPECTION under SCAN TOOL PROBLEMS. If scan tool does not display UNABLE TO CONNECT TO VEHICLE, go to next step.
- Record any DTCs and freeze-frame data displayed for system diagnosis. If driveability problem exists and no DTCs are present, go to TROUBLE SHOOTING - NO CODES article for diagnosis by symptom.
- If any DTCs are present, perform appropriate diagnostic test. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION table. For more information on freeze-frame data, see FREEZE-FRAME DATA under INTRODUCTION. For information on 2-trip detection logic codes, see TWO-TRIP DETECTION LOGIC under DETECTION LOGIC under INTRODUCTION.
- After repairs for DTC have been completed, DTCs must be cleared from ECM memory. See CLEARING DIAGNOSTIC TROUBLE CODES .
DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC (1) | Description | ||||||
|---|---|---|---|---|---|---|---|
| P0100 | Mass Airflow (MAF) Sensor Circuit | ||||||
| P0101 | Mass Airflow (MAF) Sensor Circuit Range/Performance Fault | ||||||
| P0110 | Intake Air Temperature (IAT) Sensor Circuit | ||||||
| P0115 | Engine Coolant Temperature (ECT) Sensor Circuit | ||||||
| P0116 | Engine Coolant Temperature (ECT) Circuit Range/Performance Fault | ||||||
| P0120 | Throttle (TP)/Pedal Position Sensor Switch "A" Circuit Malfunction | ||||||
| P0121 | Throttle (TP)/Pedal Position Sensor Switch "A" Circuit Range/Performance Fault | ||||||
| P0125 | Insufficient Coolant Temperature For Closed Loop Fuel Control | ||||||
| P0128 | Thermostat Malfunction | ||||||
| P0130 | Heated Oxygen Sensor Circuit Fault (Bank 1 Sensor 1) | ||||||
| P0133 | Heated Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 1) | ||||||
| P0135 | Heated Oxygen Sensor Heater Circuit Fault (Bank 1 Sensor 1) | ||||||
| P0136 | Heated Oxygen Sensor Circuit Fault (Bank 1 Sensor 2) | ||||||
| P0141 | Heated Oxygen Sensor Heater Circuit Fault (Bank 1 Sensor 2) | ||||||
| P0150 | Heated Oxygen Sensor Circuit Fault (Bank 2 Sensor 1) | ||||||
| P0153 | Heated Oxygen Sensor Circuit Slow Response (Bank 2 Sensor 1) | ||||||
| P0155 | Heated Oxygen Sensor Heater Circuit Fault (Bank 2 Sensor 1) | ||||||
| P0156 | Heated Oxygen Sensor Circuit Fault (Bank 2 Sensor 2) | ||||||
| P0161 | Heated Oxygen Sensor Heater Circuit Fault (Bank 2 Sensor 2) | ||||||
| P0171 | System Too Lean (Fuel Trim) | ||||||
| P0172 | System Too Rich (Fuel Trim) | ||||||
| P0174 | System Too Lean | ||||||
| P0175 | System Too Rich | ||||||
| P0300 | Random Cylinder Misfire Detected | ||||||
| P0301, P0302, P0303, P0304, P0305, P0306, P0307 OR P0308 | Cylinders No. 1-8 Misfire Detected | ||||||
| P0325 OR P0330 | Knock Sensor Circuit Fault | ||||||
| P0335 | Crankshaft Position (CKP) Sensor "A" Circuit Fault | ||||||
| P0340 | Variable Valve Timing (VVT) Sensor Circuit | ||||||
| P0420 | Catalyst System Efficiency Below Threshold (Bank 1) | ||||||
| P0430 | Catalyst System Efficiency Below Threshold (Bank 2) | ||||||
| P0440 | EVAP System Malfunction | ||||||
| P0441 | Incorrect EVAP Purge Flow | ||||||
| P0446 | EVAP Vent Control Fault | ||||||
| P0450 | EVAP Pressure Sensor Malfunction | ||||||
| P0451 | EVAP Pressure Sensor Range/Performance Fault | ||||||
| P0500 | Vehicle Speed Sensor (VSS) Malfunction | ||||||
| P0505 | Idle Control System Malfunction | ||||||
| P0710(2) | Transmission Fluid Temperature Sensor Fault | ||||||
| P0715(2) | O/D Direct Clutch Speed Sensor Fault | ||||||
| P0750(2) | Shift Solenoid Valve No. 1 Fault | ||||||
| P0753(2) | Shift Solenoid Valve No. 1 Electrical Fault | ||||||
| P0755(2) | Shift Solenoid Valve No. 2 Fault | ||||||
| P0758(2) | Shift Solenoid Valve No. 2 Electrical Fault | ||||||
| P0770(2) | Shift Solenoid Valve SL Fault | ||||||
| P0773(2) | Shift Solenoid Valve SL Electrical Fault | ||||||
| P1120 | Accelerator Pedal Position Sensor Circuit Fault | ||||||
| P1121 | Accelerator Pedal Position Sensor Range/Performance Fault | ||||||
| P1125 | Throttle Control Motor Circuit Fault | ||||||
| P1126 | Magnetic Clutch Circuit Fault | ||||||
| P1127 | ETCS Actuator Power Source Circuit Fault | ||||||
| P1128 | Throttle Control Motor Lock Fault | ||||||
| P1129 | ETCS Fault | ||||||
| P1200 | Fuel Pump Relay/ECU Circuit Fault | ||||||
| P1300, P1305, P1310, P1315, P1320, P1325, P1330 Or P1340 | Ignitor Circuit Malfunction Nos. 1-8 | ||||||
| P1335 | Crankshaft Position (CKP) Sensor Circuit | ||||||
| P1520 | Stoplight Switch Signal Malfunction | ||||||
| P1600 | ECM Batt Malfunction | ||||||
| P1633 | ECM Fault (ETCS Circuit) | ||||||
| P1700(2) | Vehicle Speed Sensor No. 2 Fault | ||||||
| P1760(2) | Shift Solenoid Valve SLT Fault | ||||||
| P1780 | Park/Neutral Position Switch Malfunction | ||||||
| P1782(2) | Transfer L4 Switch Malfunction | ||||||
| P1783(2) | Transfer Neutral Switch Malfunction | ||||||
| B2795(3) | Unmatched Key Code | ||||||
| B2796(3) | No Communication In Immobilizer System | ||||||
| B2797(3) | Communication Malfunction No. 1 | ||||||
| B2798(3) | Communication Malfunction No. 2 | ||||||
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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.