Engine Controls - Self-Diagnostics - 2.5L

• Introduction
• Self-Diagnostic System
  • On-Board Diagnostics
  • Two-Trip Detection Logic
  • Freeze-Frame Data
  • Malfunction Indicator Light (Mil) Inspection
    • Notes
    • Operation
    • Hard Failures
    • Intermittent Failures
  • Malfunction Indicator Light Diagnosis
    • Malfunction Indicator Light Does Not Come On
    • Malfunction Indicator Light Does Not Go Off
    • Malfunction Indicator Light Does Not Blink At A Cycle Of 3 Hz
    • Malfunction Indicator Light Continues To Blink At A Cycle Of 3 Hz
  • Testing Procedure
  • Retrieving Diagnostic Trouble Codes
    • Using Subaru Select Monitor (SSM)
    • Using OBD-II Scan Tool
  • Clearing Diagnostic Trouble Codes
    • Using Subaru Select Monitor (SSM)
    • Using OBD-II Scan Tool
  • Compulsory Valve Operation Check Mode
  • Engine Control Module Location
  • Verification Procedure
    • Notes
    • Subaru Select Monitor (SSM) Procedure
    • OBD-II Scan Tool Procedure
• Programming
  • ISC Initialization
• Drive Cycles
  • Notes
  • Drive Cycle Preparation
    • Notes
    • Drive Cycle No. 1
    • Drive Cycle No. 2
    • Drive Cycle No. 3
• Summary
• Diagnostic Trouble Code Definitions
• Diagnostic Tests
  • Notes
  • DTC P0031: Front Oxygen Sensor (A/F) Heater Circuit Low Input
  • DTC P0032: Front Oxygen Sensor (A/F) Heater Circuit High Input
  • DTC P0037: Rear Heated Oxygen Sensor (Ho2S) Heater Circuit Malfunction (Forester, IMPREZA & Outback Sport)
  • DTC P0037: Rear Heated Oxygen Sensor (Ho2S) Heater Circuit Low Input (Legacy & Outback)
  • DTC P0038: Rear Heated Oxygen Sensor (Ho2S) Heater Circuit High Input
  • DTC P0065: Air Assist Injector Solenoid Valve Malfunction
  • DTC P0066: Air Assist Injector Solenoid Valve Circuit Low Input
  • DTC P0067: Air Assist Injector Solenoid Valve Circuit High Input
  • DTC P0106: Pressure Sensor Circuit Range/Performance Problem (Low Input)
  • DTC P0107: Pressure Sensor Circuit Low Input
  • DTC P0108: Pressure Sensor Circuit High Input
  • DTC P0111: Intake Air Temperature (IAT) Sensor Circuit Range/Performance Problem
  • DTC P0112: Intake Air Temperature (IAT) Sensor Circuit Low Input
  • DTC P0113: Intake Air Temperature (IAT) Sensor Circuit High Input
  • DTC P0117: Engine Coolant Temperature (ECT) Sensor Circuit Low Input
  • DTC P0118: Engine Coolant Temperature (ECT) Sensor Circuit High Input
  • DTC P0121: Throttle Position (TP) Sensor Circuit Range/Performance Problem (High Input)
  • DTC P0122: Throttle Position (TP) Sensor Circuit Low Input
  • DTC P0123: Throttle Position (TP) Sensor Circuit High Input
  • DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control
  • DTC P0128: Thermostat Malfunction
  • DTC P0130: Front Oxygen Sensor (A/F) Circuit Range/Performance Problem (Lean)
  • DTC P0131: Front Oxygen Sensor (A/F) Circuit Malfunction (Open Circuit)
  • DTC P0132: Front Oxygen Sensor (A/F) Circuit Malfunction (Short Circuit)
  • DTC P0133: Front Oxygen Sensor (A/F) Circuit Slow Response
  • DTC P0136: Rear Heated Oxygen Sensor (Ho2S) Circuit Malfunction (Forester, IMPREZA & Outback Sport)
  • DTC P0137: Rear Heated Oxygen Sensor (Ho2S) Circuit Low Input (Legacy & Outback)
  • P0138: Rear Heated Oxygen Sensor (Ho2S) Circuit High Input (Legacy & Outback)
  • DTC P0139: Rear Heated Oxygen Sensor (Ho2S) Circuit Slow Response
  • DTC P0171: Fuel Trim Malfunction (A/F Too Lean)
  • DTC P0172: Fuel Trim Malfunction (A/F Too Rich)
  • DTC P0181: Fuel Temperature Sensor "A" Circuit Range/Performance Problem
  • DTC P0182: Fuel Temperature Sensor "A" Circuit Low Input
  • DTC P0183: Fuel Temperature Sensor "A" Circuit High Input (Forester, IMPREZA & Outback Sport)
  • DTC P0183: Fuel Temperature Sensor "A" Circuit High Input (Legacy & Outback)
  • DTC P0301, DTC P0302, DTC P0303 Or DTC P0304
  • DTC P0327: Knock Sensor (KS) Circuit Low Input
  • DTC P0328: Knock Sensor (KS) Circuit High Input
  • DTC P0335: Crankshaft Position (CKP) Sensor Circuit Malfunction
  • DTC P0336: Crankshaft Position (CKP) Sensor Circuit Range/Performance Problem
  • DTC P0340: Camshaft Position (CMP) Sensor Circuit Malfunction
  • DTC P0341: Camshaft Position (CMP) Sensor Circuit Range/Performance Problem
  • DTC P0420: Catalyst System Efficiency Below Threshold (Forester)
  • DTC P0420: Catalyst System Efficiency Below Threshold (IMPREZA, Outback Sport, Legacy & Outback)
  • DTC P0442: EVAP System Malfunction
  • DTC P0444: EVAP System Purge Control Valve Circuit Low Input (Forester, IMPREZA & Outback Sport)
  • DTC P0445: EVAP System Purge Control Valve Circuit High Input (Forester, IMPREZA & Outback Sport)
  • DTC P0447: EVAP System Vent Control Circuit Low Input
  • DTC P0448: EVAP System Vent Control Circuit High Input
  • DTC P0451: EVAP System Pressure Sensor Range/Performance Problem
  • DTC P0452: EVAP System Pressure Sensor Low Input (Forester, IMPREZA & Outback Sport)
  • DTC P0452: EVAP System Pressure Sensor Low Input (Legacy & Outback)
  • DTC P0453: EVAP System Pressure Sensor High Input (Forester, IMPREZA & Outback Sport)
  • DTC P0453: EVAP System Pressure Sensor High Input (Legacy & Outback)
  • DTC P0456: EVAP System Malfunction
  • DTC P0457: EVAP System Malfunction (Legacy & Outback)
  • DTC P0458: EVAP System Purge Control Valve Circuit Low Input (Legacy & Outback)
  • DTC P0459: EVAP System Purge Control Solenoid Valve Circuit High Input
  • DTC P0461: Fuel Level Sensor Circuit Range/Performance Problem (Forester, IMPREZA & Outback Sport)
  • DTC P0462: Fuel Level Sensor Circuit Low Input (Forester, IMPREZA & Outback Sport)
  • DTC P0462: Fuel Level Sensor Circuit Low Input (Legacy & Outback)
  • DTC P0463: Fuel Level Sensor Circuit High Input (Forester, IMPREZA & Outback Sport)
  • DTC P0463: Fuel Level Sensor Circuit High Input (Legacy & Outback)
  • DTC P0464: Fuel Level Sensor Circuit Intermittent Input (Forester, IMPREZA & Outback Sport)
  • DTC P0464: Fuel Level Sensor Circuit Intermittent Input (Legacy & Outback)
  • DTC P0480: Cooling Fan Relay No. 1 Circuit Low Input (Forester, IMPREZA & Outback Sport)
  • DTC P0483: Cooling Fan Function Problem
  • DTC P0500: Vehicle Speed Sensor (VSS) Malfunction (Forester, IMPREZA & Outback Sport)
  • DTC P0500: Vehicle Speed Sensor (VSS) Malfunction (Legacy & Outback)
  • DTC P0506: Idle Control System Rpm Lower Than Expected
  • DTC P0507: Idle Control System Rpm Higher Than Expected
  • DTC P0512: Starter Switch Circuit High Input
  • DTC P0604: Internal Control Module Memory Check Sum Error
  • P0691: Cooling Fan Relay No. 1 Circuit Low Input (Legacy & Outback)
  • DTC P0692: Cooling Fan Relay No. 1 Circuit High Input (Legacy & Outback)
  • DTC P0703: Brake Switch Input Malfunction (A/T)
  • DTC P0731, DTC P0732, DTC P0733 & DTC P0734
  • DTC P0741: Torque Converter Clutch System Malfunction (A/T)
  • DTC P0851: Inhibitor Switch Circuit Low Input (A/T - Legacy & Outback)
  • DTC P0851: Neutral Position Switch Circuit Low Input (M/T - Legacy & Outback)
  • DTC P0852: Inhibitor Switch Circuit High Input (A/T - Legacy & Outback)
  • DTC P0852: Neutral Position Switch Circuit High Input (M/T - Legacy & Outback)
  • DTC P0864: A/T Diagnosis Input Signal Circuit Malfunction (Legacy & Outback)
  • DTC P0865: A/T Diagnosis Input Signal Circuit Low Input (Legacy & Outback)
  • DTC P0866: A/T Diagnosis Input Signal Circuit High Input (Legacy & Outback)
  • DTC P1110: Atmospheric Pressure Sensor Circuit Low Input (Forester, IMPREZA & Outback Sport)
  • DTC P1110: Atmospheric Pressure Sensor Circuit Low Input (Legacy & Outback)
  • DTC P1111: Atmospheric Pressure Sensor Circuit High Input (Forester, IMPREZA & Outback Sport)
  • DTC P1111: Atmospheric Pressure Sensor Circuit High Input (Legacy & Outback)
  • DTC P1112: Atmospheric Pressure Sensor Circuit Range/Performance Problem (Forester, IMPREZA & Outback Sport)
  • DTC P1112: Atmospheric Pressure Sensor Circuit Range/Performance Problem (Legacy & Outback)
  • DTC P1137: Front Oxygen Sensor (A/F) Circuit Range/Performance Problem
  • DTC P1142: Throttle Position (TP) Sensor Circuit Range/Performance Problem (Low Input)
  • DTC P1146: Pressure Sensor Circuit Range/Performance Problem (High Input)
  • DTC P1400: Fuel Tank Pressure Control Solenoid Valve Circuit Low Input
  • DTC P1420: Fuel Tank Pressure Control Solenoid Valve Circuit High Input
  • DTC P1442: Fuel Level Sensor Circuit Range/Performance Problem 2
  • DTC P1443: EVAP System Vent Control Function Problem
  • DTC P1446: EVAP System Atmospheric Pressure Solenoid Valve Circuit Low Input (Legacy & Outback)
  • DTC P1447: EVAP System Atmospheric Pressure Solenoid Valve Circuit High Input (Legacy & Outback)
  • DTC P1448: EVAP System Atmospheric Pressure Solenoid Valve Circuit Range/Performance Problem (Legacy & Outback)
  • DTC P1480: Cooling Fan Relay No. 1 Circuit High Input (Forester, IMPREZA & Outback Sport)
  • DTC P1507: Idle Control System Malfunction (Fail-Safe)
  • DTC P1510, DTC P1512, DTC P1514 & DTC P1516
  • DTC P1511, DTC P1513, DTC P1515 & DTC P1517
  • DTC P1518: Starter Switch Circuit Low Input
  • DTC P1540: Vehicle Speed Sensor (VSS) Malfunction 2
  • DTC P1560: Back-Up Voltage Circuit Malfunction
  • DTC P1590: Inhibitor Switch Circuit High Input (A/T - Forester, IMPREZA & Outback Sport)
  • DTC P1591: Inhibitor Switch Circuit Low Input (A/T - Forester, IMPREZA & Outback Sport)
  • DTC P1592: Neutral Position Switch Circuit Malfunction (M/T - Forester, IMPREZA & Outback Sport)
  • DTC P1594: A/T Diagnosis Input Signal Circuit Malfunction (Forester, IMPREZA & Outback Sport)
  • DTC P1595: A/T Diagnosis Input Signal Circuit Low Input (Forester, IMPREZA & Outback Sport)
  • DTC P1596: A/T Diagnosis Input Signal Circuit High Input (Forester, IMPREZA & Outback Sport)
  • DTC P1698: Engine Torque Control Cut Signal Circuit Low Input (A/T)
  • DTC P1699: Engine Torque Control Cut Signal Circuit High Input (A/T)
  • DTC P1701: Cruise Control Set Signal Circuit Malfunction (A/T)
  • DTC P1711: Engine Torque Control Signal No. 1 Circuit Malfunction (A/T)
  • DTC P1712: Engine Torque Control Signal No. 2 Circuit Malfunction (A/T)