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.
2005 Subaru Baja Base, StandardFACTORY OEM SERVICE PROCEDURE
Engine Controls - Engine (Diagnostics) (H4SO)
- Basic Diagnostic Procedure
- Check List for Interview
- General Description
- Electrical Components Location
- Engine Control Module (ECM) I/O Signal
- Engine Condition Data
- Transmission Control Module (TCM) I/O Signal
- Data Link Connector
- OBD-II General Scan Tool
- Subaru Select Monitor
- Operation
- How To Use SUBARU Select Monitor
- Read Diagnostic Trouble Code (DTC) For Engine. (Normal Mode)
- Read Diagnostic Trouble Code (DTC) For Engine. (OBD Mode)
- Read Current Data For Engine. (Normal Mode)
- Read Current Data For Engine (OBD Mode)
- Read Freeze Frame Data For Engine. (OBD Mode)
- Led Operation Mode For Engine
- Read Current Data For At.
- Operation
- Read Diagnostic Trouble Code
- Inspection Mode
- Drive Cycle
- Clear Memory Mode
- Compulsory Valve Operation Check Mode
- Engine Malfunction Indicator Lamp (MIL)
- Procedure
- Activation Of Check Engine Malfunction Indicator Lamp (Mil)
- Check Engine Malfunction Indicator Lamp (Mil) Does Not Come On
- Check Engine Malfunction Indicator Lamp (Mil) Does Not Go Off.
- Check Engine Malfunction Indicator Lamp (Mil) Does Not Blink At A Cycle Of 3 HZ.
- Check Engine Malfunction Indicator Lamp (Mil) Remains Blinking At A Cycle Of 3 HZ.
- Diagnostics for Engine Starting Failure
- List of Diagnostic Trouble Code (DTC)
- Diagnostic Procedure with Diagnostic Trouble Code (DTC)
- DTC P0030 - Ho2S Heater Control Circuit (Bank 1 Sensor 1) -
- DTC P0031 - Ho2S Heater Control Circuit Low (Bank 1 Sensor 1) -
- DTC P0032 - Ho2S Heater Control Circuit High (Bank 1 Sensor 1) -
- DTC P0037 - Ho2S Heater Control Circuit Low (Bank 1 Sensor 2) -
- DTC P0038 - Ho2S Heater Control Circuit High (Bank 1 Sensor 2) -
- DTC P0065 - Air Assisted Injector Control Range/Performance -
- DTC P0066 - Air Assisted Injector Control Circuit Or Circuit Low -
- DTC P0067 - Air Assisted Injector Control Circuit High -
- DTC P0068 - Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance -
- DTC P0107 - Manifold Absolute Pressure/Barometric Pressure Circuit Low Input -
- DTC P0108 - Manifold Absolute Pressure/Barometric Pressure Circuit High Input -
- DTC P0111 - Intake Air Temperature Circuit Range/Performance -
- DTC P0112 - Intake Air Temperature Circuit Low Input -
- DTC P0113 - Intake Air Temperature Circuit High Input -
- DTC P0117 - Engine Coolant Temperature Circuit Low Input -
- DTC P0118 - Engine Coolant Temperature Circuit High Input -
- DTC P0121 - Throttle/Pedal Position Sensor/Switch "A" Circuit Range/Performance -
- DTC P0122 - Throttle/Pedal Position Sensor/Switch "A" Circuit Low Input -
- DTC P0123 - Throttle/Pedal Position Sensor/Switch "A" Circuit High Input -
- DTC P0125 - Insufficient Coolant Temperature For Closed Loop Fuel Control -
- DTC P0126 - Sufficient Coolant Temperature For Stable Operation -
- DTC P0128 - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) -
- DTC P0130 - O2 Sensor Circuit (Bank 1 Sensor 1) -
- DTC P0131 - O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1) -
- DTC P0132 - O2 Sensor Circuit High Voltage (Bank 1 Sensor 1) -
- DTC P0133 - O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)-
- DTC P0134 - O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1) -
- DTC P0137 - O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2) -
- DTC P0138 - O2 Sensor Circuit High Voltage (Bank 1 Sensor 2) -
- DTC P0139 - O2 Sensor Circuit Slow Response (Bank 1 Sensor 2)-
- DTC P0171 - System Too Lean (Bank 1) -
- DTC P0172 - System Too Rich (Bank 1) -
- DTC P0181 - Fuel Temperature Sensor "A" Circuit Range/Performance -
- DTC P0182 -- Fuel Temperature Sensor "A" Circuit Low Input -
- DTC P0183 - Fuel Temperature Sensor "A" Circuit High Input -
- 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 P0327 - Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor) -
- DTC P0328 - Knock Sensor 1 Circuit High Input (Bank 1 Or Single Sensor) -
- DTC P0335 - Crankshaft Position Sensor "A" Circuit -
- DTC P0336 - Crankshaft Position Sensor "A" Circuit Range/Performance -
- DTC P0340 - Camshaft Position Sensor "A" Circuit (Bank 1 Or Single Sensor) -
- DTC P0341 - Camshaft Position Sensor "A" Circuit Range/Performance (Bank 1 Or Single Sensor) -
- DTC P0400 - Exhaust Gas RECIRCULATION Flow -
- DTC P0420 - Catalyst System Efficiency Below Threshold (Bank 1) -
- DTC P0442 - Evaporative Emission Control System Leak Detected (Small Leak) -
- DTC P0447 - Evaporative Emission Control System Vent Control Circuit Open -
- DTC P0448 - Evaporative Emission Control System Vent Control Circuit Shorted -
- DTC P0451 - Evaporative Emission Control System Pressure Sensor Range/Performance -
- DTC P0452 - Evaporative Emission Control System Pressure Sensor Low Input -
- DTC P0453 - Evaporative Emission Control System Pressure Sensor High Input -
- DTC P0456 - Evaporative Emission Control System Leak Detected (Very Small Leak) -
- DTC P0457 - Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off) -
- DTC P0458 - Evaporative Emission Control System Purge Control Valve Circuit Low -
- DTC P0459 - Evaporative Emission Control System Purge Control Valve Circuit High -
- DTC P0461 - Fuel Level Sensor Circuit Range/Performance -
- DTC P0462 - Fuel Level Sensor Circuit Low Input -
- DTC P0463 - Fuel Level Sensor Circuit High Input -
- DTC P0464 - Fuel Level Sensor Circuit Intermittent -
- DTC P0483 - Cooling Fan Rationality Check -
- DTC P0502 - Vehicle Speed Sensor Circuit Low Input -
- DTC P0503 - Vehicle Speed Sensor Intermittent/Erratic/High -
- DTC P0506 - Idle Control System Rpm Lower Than Expected -
- DTC P0507 - Idle Control System Rpm Higher Than Expected -
- DTC P0512 - Starter Request Circuit -
- DTC P0519 - Idle Air Control Circuit System Performance -
- DTC P0565 - Cruise Control On Signal -
- DTC P0604 - Internal Control Module Random Access Memory (Ram) Error -
- DTC P0691 - Cooling Fan 1 Control Circuit Low -
- DTC P0692 - Cooling Fan 1 Control Circuit High -
- DTC P0703 - Torque Converter/Brake Switch "B" Circuit -
- DTC P0731 - Gear 1 Incorrect Ratio -
- DTC P0732 - Gear 2 Incorrect Ratio -
- DTC P0733 - Gear 3 Incorrect Ratio -
- DTC P0734 - Gear 4 Incorrect Ratio -
- DTC P0741 - Torque Converter Clutch Circuit Performance Or Stuck Off -
- DTC P0851 - Neutral Switch Input Circuit Low (At Model) -
- DTC P0851 - Neutral Switch Input Circuit Low (Mt Model)
- DTC P0852 - Neutral Switch Input Circuit High (At Model) -
- DTC P0852 - Neutral Switch Input Circuit High (Mt Model) -
- DTC P0864 - TCM Communication Circuit Range/Performance -
- DTC P0865 - TCM Communication Circuit Low -
- DTC P0866 - TCM Communication circuit high -
- DTC P1134 - A/F Sensor Micro-Computer Problem -
- DTC P1137 - O2 Sensor Circuit (Bank 1 Sensor 1) -
- DTC P1400 - Fuel Tank Pressure Control Solenoid Valve Circuit Low -
- DTC P1420 - Fuel Tank Pressure Control Solenoid Valve Circuit High -
- DTC P1443 - Vent Control Solenoid Valve Function Problem -
- DTC P1446 - Fuel Tank Sensor Control Valve Circuit Low -
- DTC P1447 - Fuel Tank Sensor Control Valve Circuit High -
- DTC P1448 - Fuel tank sensor control valve range/performance -
- DTC P1492 - EGR Solenoid Valve Signal #1 Circuit Malfunction (Low Input) -
- DTC P1493 - EGR Solenoid Valve Signal #1 Circuit Malfunction (High Input) -
- DTC P1494 - EGR Solenoid Valve Signal #2 Circuit Malfunction (Low Input) -
- DTC P1495 - EGR Solenoid Valve Signal #2 Circuit Malfunction (High Input) -
- DTC P1496 - EGR Solenoid Valve Signal #3 Circuit Malfunction (Low Input)-
- DTC P1497 - EGR Solenoid Valve Signal #3 Circuit Malfunction (High Input) -
- DTC P1498 - EGR Solenoid Valve Signal #4 Circuit Malfunction (Low Input) -
- DTC P1499 - EGR Solenoid Valve Signal #4 Circuit Malfunction (High Input) -
- DTC P1510 - ISC Solenoid Valve Signal #1 Circuit Malfunction (Low Input) -
- DTC P1511 - ISC Solenoid Valve Signal #1 Circuit Malfunction (High Input) -
- DTC P1512 - ISC Solenoid Valve Signal #2 Circuit Malfunction (Low Input) -
- DTC P1513 - ISC Solenoid Valve Signal #2 Circuit Malfunction (High Input) -
- DTC P1514 - ISC Solenoid Valve Signal #3 Circuit Malfunction (Low Input) -
- DTC P1515 - ISC Solenoid Valve Signal #3 Circuit Malfunction (High Input) -
- DTC P1516 - ISC Solenoid Valve Signal #4 Circuit Malfunction (Low Input) -
- DTC P1517 - ISC Solenoid Valve Signal #4 Circuit Malfunction (High Input) -
- DTC P1518 - Starter Switch Circuit Low Input -
- DTC P1560 - Back-Up Voltage Circuit Malfunction -
- DTC P1698 - Engine Torque Control Cut Signal Circuit Malfunction (Low Input) -
- DTC P1699 - Engine Torque Control Cut Signal Circuit Malfunction (High Input) -
- DTC P1711 - Engine Torque Control Signal #1 Circuit Malfunction -
- DTC P1712 - Engine Torque Control Signal #2 Circuit Malfunction -
- DTC P2096 - Post Catalyst Fuel Trim System Too Lean Bank 1 -
- DTC P2097 - Post Catalyst Fuel Trim System Too Rich Bank 1 -
- DTC P2227 - Atmospheric Pressure Sensor Circuit Range/Performance -
- DTC P2228 - Atmospheric Pressure Sensor Circuit Malfunction (Low Input) -
- DTC P2229 - Atmospheric Pressure Sensor Circuit Malfunction (High Input) -
- General Diagnostic Table
Factory Service Tools
Use the Manual With the Right Hardware
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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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