Engine (Diagnostics) (H4SO)

Basic Diagnostic Procedure
- Procedure
  - Engine
  - Automatic Transmission
Check List for Interview
- Check
  - Check List No. 1
  - Check List No. 2
General Description
- Caution
- Inspection
- Note
- Preparation Tool
Electrical Components Location
- Location
  - Engine
  - Transmission
Engine Control Module (ECM) I/O Signal
- Electrical Specification
Engine Condition Data
- Electrical Specification
Transmission Control Module (TCM) I/O Signal
- Electrical Specification
Data Link Connector
- Note
OBD-II General Scan Tool
- Operation
Subaru Select Monitor
- Operation
Read Diagnostic Trouble Code (DTC)
- Operation
Inspection Mode
- Operation
Drive Cycle
- Operation
Clear Memory Mode
- Operation
Compulsory Valve Operation Check Mode
- Operation
Malfunction Indicator Light
- Procedure
- Activation Of Malfunction Indicator Light
- 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 Remains Blinking At A Cycle Of 3 HZ
Diagnostics for Engine Starting Failure
- Procedure
- Starter Motor Circuit
- Control Module Power Supply And Ground Line
- Ignition Control System
- Fuel Pump Circuit
- Fuel Injector Circuit
List of Diagnostic Trouble Code (DTC)
- List
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
- DTC P0030: Ho2S Heater Control Circuit (Bank 1 Sensor 1) - DTC Detecting Condition:
  - Notes
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0031: Ho2S Heater Control Circuit Low (Bank 1 Sensor 1)
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0032: Ho2S Heater Control Circuit High (Bank 1 Sensor 1)
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0037: Ho2S Heater Control Circuit Low (Bank 1 Sensor 2)
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0038: Ho2S Heater Control Circuit High (Bank 1 Sensor 2)
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0065: Air Assisted Injector Control Range/Performance
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0066: Air Assisted Injector Control Circuit Or Circuit Low
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0067: Air Assisted Injector Control Circuit High
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0068: Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0107: Manifold Absolute Pressure/Barometric Pressure Circuit Low Input
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0108: Manifold Absolute Pressure/Barometric Pressure Circuit High Input
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0111: Intake Air Temperature Circuit Range/Performance
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0112: Intake Air Temperature Circuit Low Input
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0113: Intake Air Temperature Circuit High Input
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0117: Engine Coolant Temperature Circuit Low Input
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0118: Engine Coolant Temperature Circuit High Input
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0121: Throttle/Pedal Position Sensor/Switch "A" Circuit Range/Performance
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0122: Throttle/Pedal Position Sensor/Switch "A" Circuit Low Input
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0123: Throttle/Pedal Position Sensor/Switch "A" Circuit High Input
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
  - DTC Detecting Condition:
  - Trouble Symptom:
- DTC P0129: Atmospheric Pressure Sensor Circuit Range/Performance
  - DTC Detecting Condition:
- DTC P0130: O2 Sensor Circuit (Bank 1 Sensor 1)
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0131: O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0132: O2 Sensor Circuit High Voltage (Bank 1 Sensor 1)
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0133: O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0134: O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0137: O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0138: O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0139: O2 Sensor Circuit Slow Response (Bank 1 Sensor 2)
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0171: System Too Lean (Bank 1)
- DTC P0172: System Too Rich (Bank 1)
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Diagnostic Procedures:
- DTC P0181: Fuel Temperature Sensor "A" Circuit Range/Performance
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0182: Fuel Temperature Sensor "A" Circuit Low Input
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0183: Fuel Temperature Sensor "A" Circuit High Input
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- 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 Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0327: Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0328: Knock Sensor 1 Circuit High Input (Bank 1 Or Single Sensor)
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0335: Crankshaft Position Sensor "A" Circuit
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0336: Crankshaft Position Sensor "A" Circuit Range/ Performance
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0340: Camshaft Position Sensor "A" Circuit (Bank 1 Or Single Sensor)
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0341: Camshaft Position Sensor "A" Circuit Range/Performance (Bank 1 Or Single Sensor)
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0400: EGR System
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1)
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0442: Evaporative Emission Control System Leak Detected (Small Leak)
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0447: Evaporative Emission Control System Vent Control Circuit Open
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0448: Evaporative Emission Control System Vent Control Circuit Shorted
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0451: Evaporative Emission Control System Pressure Sensor Range/Performance
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0452: Evaporative Emission Control System Pressure Sensor Low Input
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0453: Evaporative Emission Control System Pressure Sensor High Input
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0456: Evaporative Emission Control System Leak Detected (Very Small Leak)
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0457: Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off)
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0458: Evaporative Emission Control System Purge Control Valve Circuit Low
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0459: Evaporative Emission Control System Purge Control Valve Circuit High
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0461: Fuel Level Sensor Circuit Range/Performance
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0462: Fuel Level Sensor Circuit Low Input
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0463: Fuel Level Sensor Circuit High Input
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0464: Fuel Level Sensor Circuit Intermittent
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0483: Cooling Fan Rationality Check
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0502: Vehicle Speed Sensor Circuit Low Input
- DTC P0503: Vehicle Speed Sensor Intermittent/Erratic/High
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0506: Idle Control System Rpm Lower Than Expected
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0507: Idle Control System Rpm Higher Than Expected
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0512: Starter Request Circuit
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0519: Idle Control System Malfunction (Fail-Safe)
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0565: Cruise Control On Signal
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0604: Internal Control Module Random Access Memory (Ram) Error
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0691: Cooling Fan 1 Control Circuit Low
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0692: Cooling Fan 1 Control Circuit High
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0703: Torque Converter/Brake Switch "B" Circuit
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- 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 Detecting Condition:
  - Trouble Symptom:
  - Diagnostic Procedures:
- DTC P0741: Torque Converter Clutch Circuit Performance Or Stuck Off
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Diagnostic Procedures:
- DTC P0851: Neutral Position Switch Input Circuit Low
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0851: Neutral Position Switch Input Circuit Low (Mt Model)
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0852: Neutral Position Switch Input Circuit High (At Model)
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0864: TCM Communication Circuit Range Performance
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0865: TCM Communication Circuit Low
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P0866: TCM Communication Circuit High
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P1110: Atmospheric Pressure Sensor Circuit Malfunction (Low Input)
  - DTC Detecting Condition:
  - Diagnostic Procedures:
- DTC P1111: Atmospheric Pressure Sensor Circuit Malfunction (High Input)
  - DTC Detecting Condition:
  - Diagnostic Procedures:
- DTC P1134: A/F Sensor Micro-Computer Problem
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P1137: O2 Sensor Circuit (LAMDA=1) (Bank 1 Sensor 1)
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P1400: Fuel Tank Pressure Control Solenoid Valve Circuit Low
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P1420: Fuel Tank Pressure Control Solenoid Valve Circuit High
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P1443: Vent Control Solenoid Valve Function Problem
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P1446: Fuel Tank Sensor Control Valve Circuit Low
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P1447: Fuel Tank Sensor Control Valve Circuit High
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P1448: Fuel Tank Sensor Control Valve Range/Performance Problem
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P1492: EGR Signal Line 1 Circuit (Low)
- DTC P1493: EGR Signal Line 1 Circuit (High)
- DTC P1494: EGR Signal Line 2 Circuit (Low)
- DTC P1495: EGR Signal Line 2 Circuit (High)
- DTC P1496: EGR Signal Line 3 Circuit (Low)
- DTC P1497: EGR Signal Line 3 Circuit (High)
- DTC P1498: EGR Signal Line 4 Circuit (Low)
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P1499: EGR Signal Line 4 Circuit (High)
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- 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 Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P1517: ISC Solenoid Valve Signal #4 Circuit Malfunction (High Input)
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P1518: Starter Switch Circuit Low Input
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P1560: Back-Up Voltage Circuit Malfunction
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P1698: Engine Torque Control Cut Signal Circuit Low Input
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P1699: Engine Torque Control Cut Signal Circuit High Input
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P1711: Engine Torque Control Signal 1 Circuit Malfunction
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P1712: Engine Torque Control Signal 2 Circuit Malfunction
  - DTC Detecting Condition:
  - Trouble Symptom:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P2096: Post Catalyst Fuel Trim System Too Lean Bank 1
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
- DTC P2097: Post Catalyst Fuel Trim System Too Rich Bank 1
  - DTC Detecting Condition:
  - Wiring Diagram:
  - Diagnostic Procedures:
General Diagnostic Table
- Inspection
  - Engine
  - Automatic Transmission