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.
2004 Toyota MR2 C56FACTORY OEM SERVICE PROCEDURE
Engine Controls - Diagnostics
- How To Proceed With Troubleshooting
- Customer Problem Analysis Check
- Pre-Check
- Readiness Monitor Drive Pattern
- Diagnostic Trouble Code Chart
- Parts Location
- Terminals Of ECM
- Problem Symptoms Table
- DTC P0010: Camshaft Position "A" Actuator Circuit (Bank 1)
- DTC P0011: Camshaft Position "A" Timing Over-Advanced or System Performance (Bank 1), DTC P0012: Camshaft Position "A" Timing Over-Retarded (Bank 1)
- DTC P0016: Crankshaft Position-Camshaft Position Correlation (Bank 1 Sensor A)
- DTC P0031: Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 1), DTC P0032: Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 1), DTC P0037: Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2), DTC P0038: Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 2), DTC P0051: Oxygen Sensor Heater Control Circuit Low (Bank 2 Sensor 1), DTC P0052: Oxygen Sensor Heater Control Circuit High (Bank 2 Sensor 1)
- DTC P0100: Mass or Volume Air Flow Circuit
- DTC P0101: Mass or Volume Air Flow Circuit Range/Performance Problem
- DTC P0110: Intake Air Temperature Circuit
- DTC P0115: Engine Coolant Temperature Circuit
- DTC P0116: Engine Coolant Temperature Circuit Range/Performance Problem
- DTC P0120: Throttle/Pedal Position Sensor/Switch "A" Circuit (M/T)
- DTC P0120: Throttle/Pedal Position Sensor/Switch "A" Circuit (SMT)
- DTC P0121: Throttle/Pedal Position/Switch "A" Circuit Range/Performance Problem
- DTC P0125: Insufficient Coolant Temperature for Closed Loop Fuel Control
- DTC P0128: Coolant Thermostat (Coolant Temp. Below Thermostat Regulating Temp.)
- DTC P0130: Oxygen Sensor Circuit (Bank 1 Sensor 1), DTC P0150: Oxygen Sensor Circuit (Bank 2 Sensor 1)
- DTC P0133: Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 1), DTC P0153: Oxygen Sensor Circuit Slow Response (Bank 2 Sensor 1)
- DTC P0134: Oxygen Sensor Circuit No Activity Detected (Bank 1 Sensor 1), DTC P0154: Oxygen Sensor Circuit No Activity Detected (Bank 2 Sensor 1)
- DTC P0136: Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2)
- DTC P0171: System too Lean (Bank 1), DTC P0172: System too Rich (Bank 1), DTC P0174: System too Lean (Bank 2), DTC P0175: System too Rich (Bank 2)
- DTC P0300: Random/Multiple Cylinder Misfire Detected, DTC P0301: Cylinder 1 Misfire Detected, DTC P0302: Cylinder 2 Misfire Detected, DTC P0303: Cylinder 3 Misfire Detected, DTC P0304: Cylinder 4 Misfire Detected
- DTC P0325: Knock Sensor 1 Circuit (Bank 1 or Single Sensor)
- DTC P0335: Crankshaft Position Sensor "A" Circuit, DTC P0339: Crankshaft Position Sensor "A" Circuit In - termittent
- DTC P0340: Camshaft Position Sensor Circuit "A" (Bank 1 or Signal Sensor), DTC P0341: Camshaft Position Sensor "A" Circuit Range/Performance (Signal Sensor)
- DTC P0351: Ignition Coil "A" Primary/Secondary Circuit, DTC P0352: Ignition Coil "B" Primary/Secondary Circuit, DTC P0353: Ignition Coil "C" Primary/Secondary Circuit, DTC P0354: Ignition Coil "D" Primary/Secondary Circuit
- DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1)
- DTC P0441: Evaporative Emission Control System Incorrect Purge Flow, DTC P0446: Evaporative Emission Control System Vent Control Circuit
- DTC P0442: Evaporative Emission Control System Leak Detected (small leak), DTC P0456: Evaporative Emission Control System Leak Detected (very small leak)
- DTC P0450: Evaporative Emission Control System Pressure Sensor/Switch, DTC P0451: Evaporative Emission Control System Pressure Sensor/Switch Range/Performance
- DTC P0500: Vehicle Speed Sensor "A", DTC P0503: Vehicle Speed Sensor "A" Intermittent/Erratic/High
- DTC P0504: Brake Switch "A'V'B" Correlation*
- DTC P0505: Idle Air Control System (M/T), DTC P0511: Idle Air Control Circuit (M/T)
- DTC P0505: Idle Air Control System (SMT)
- DTC P0560: System Voltage
- DTC P0604: Internal Control Module Randam Access Memory (RAM) Error*, DTC P0606: ECM/PCM Processor*, DTC P0607: Control Module Performance*, DTC P0657: Actuator Supply Voltage Circuit Open*
- DTC P0617: Starter Relay Circuit High
- DTC P0724: Brake Switch "B" Circuit High*
- DTC P0860: Gear Shift Module Communication Circuit*
- DTC P1126: Magnetic Clutch Circuit Malfunction*
- DTC P1645: Multiplex Communication Malfunction*
- DTC P1646: Transmission Control ECU Malfunction*
- DTC P2102: Throttle Actuator Control Motor Circuit Low* DTC P2103: Throttle Actuator Control Motor Circuit High*
- DTC P2111: Throttle Actuator Control System-Stuck Open*
- DTC P2118: Throttle Actuator Control Motor Current Range/Performance*
- DTC P2119: Throttle Actuator Control Throttle Body Range/Performance*
- DTC P2120: Throttle/Pedal Position Sensor/Switch "D" Circuit*
- DTC P2121: Accelerator Pedal Position Sensor Range/Performance Problem*
- ECM Power Source Circuit
- Starter Signal Circuit
- Fuel Pump Control Circuit
- TC Terminal Circuit
- A/C Compressor Circuit
- MIL Circuit
Factory Service Tools
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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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