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 Scion xA AutomaticFACTORY OEM SERVICE PROCEDURE
Engine Control System - Diagnosis
- How To Proceed With Troubleshooting
- Customer Problem Analysis Check
- Location
- Diagnosis System
- DTC Check/Clear
- Check Mode Procedure
- Basic Inspection
- Terminals Of ECM
- Data List/Active Test
- Definition Of Terms
- Part And System Name List
- List Of Disable A Monitor
- Checking Monitor Status
- Readiness Monitor Drive Pattern
- Diagnostic Trouble Code Chart
- Fail-Safe Chart
- Check For Intermittent Problems
- Problem Symptoms Table
- DTC P0010: Camshaft Position "A" Actuator Circuit (Bank 1)
- DTC P0011, DTC P0012: Camshaft Position "A" - Timing Over (Bank 1)
- DTC P0016: Crankshaft Position Correlation (Bank 1 Sensor A)
- DTC P0031, DTC P0032, DTC P0037, DTC P0038: Oxygen Sensor Heater Control Circuit (Bank 1 Sensor 1) & Oxygen Sensor Heater Control Circuit (Bank 1 Sensor 2)
- DTC P0100, DTC P0102, DTC P0103: Mass Or Volume Air Flow Circuit
- DTC P0101: Mass Or Volume Air Flow Circuit Range/Performance Problem
- DTC P0110, DTC P0112, DTC P0113: Intake Air Temperature Circuit
- DTC P0115, DTC P0117, DTC P0118: Engine Coolant Temperature Circuit
- DTC P0116: Engine Coolant Temp. Circuit Range/Performance Problem
- DTC P0120, DTC P0122, DTC P0123: Throttle/Pedal Position Sensor/Switch "A" Circuit
- DTC P0121: Throttle/Pedal Position Sensor/Switch "A" Circuit Range/Performance Problem
- DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control
- DTC P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
- DTC P0130, DTC P2195, DTC P2196: Oxygen Sensor Circuit (Bank 1 Sensor 1) Oxygen Sensor Signal Stuck Lean & Rich (Bank 1 Sensor 1)
- DTC P0133: Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 1)
- DTC P0134: Oxygen Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
- DTC P0136: Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2)
- DTC P0171, DTC P0172: System Too Lean (Bank 1) & System Too Rich (Bank 1)
- DTC P0300, DTC P0301, DTC P0302, DTC P0303, DTC P0304: Random/Multiple Cylinder Misfire Detected & Cylinder Misfire Detected
- DTC P0325: Knock Sensor 1 Circuit (Bank 1 Or Single Sensor)
- DTC P0335, DTC P0339: Crankshaft Position Sensor "A" Circuit
- DTC P0340, DTC P0341: Camshaft Position Sensor "A" Circuit (Bank 1 Or Single Sensor)
- DTC P0351, DTC P0352, DTC P0353, DTC P0354: Ignition Coil Primary/Secondary Circuit
- DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1)
- DTC P0441, DTC P0446: Evaporative Emission Control System Malfunction
- DTC P0442, DTC P0456: Evaporative Emission Control System Leak Detected
- DTC P0451, DTC P0452, DTC P0453: Evaporative Emission Control System Pressure Sensor/Switch
- DTC P0500: Vehicle Speed Sensor "A"
- DTC P0505, DTC P0511: Idle Air Control System Circuit
- DTC P0550, DTC P0552, DTC P0553: Power Steering Pressure Sensor/Switch Circuit
- DTC P0560: System Voltage
- DTC P0606: ECM/Pcm Processor
- DTC P0617: Starter Relay Circuit High
- ECM Power Source Circuit
- Fuel Pump Control Circuit
- Stop Light Switch 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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