Subaru Forester 1998-05

2.5L H4 VIN 6 Std 4

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Trouble Code: P0864



TCM Communication Circuit Range/Performance

Possible Causes:



Check driving condition (is AT shift control functioning)
 
Check accessory
 

Trouble Code: P1086



Tumble Generated Valve Position Sensor 2 Circuit Low

Possible Causes:



Using a scan tool, check current data
 
Check input signal for ECM
 
Check harness between ECM and tumble generator valve position sensor connector
 
Check poor contact
 

Trouble Code: P1087



Tumble Generated Valve Position Sensor 2 Circuit High

Possible Causes:



Using a scan tool, check current data
 
Check harness between tumble generator valve position sensor and ECM connector
 
Check harness between throttle position sensor and ECM connector
 

Trouble Code: P1088



Tumble Generated Valve Position Sensor 1 Circuit Low

Possible Causes:



Using a scan tool, check current data
 
Check input signal for ECM
 
Check harness between ECM and tumble generator valve position sensor connector
 
Check poor contact
 

Trouble Code: P1089



Tumble Generated Valve Position Sensor 1 Circuit High

Possible Causes:



Using a scan tool, check current data
 
Check harness between tumble generator valve position sensor and ECM connector
 

Trouble Code: P1090



Tumble Generated Valve System 1 (valve open)

Possible Causes:



Check any other DTC on display
 
Check tumble generator valve (RH)
 

Trouble Code: P1091



Tumble Generated Valve System 1 (valve closed)

Possible Causes:



Check any other DTC on display
 
Check tumble generator valve (RH)
 

Trouble Code: P1092



Tumble Generated Valve System 2 (valve open)

Possible Causes:



Check any other DTC on display
 
Check tumble generator valve (RH)
 

Trouble Code: P1093



Tumble Generated Valve System 2 (valve closed)

Possible Causes:



Check any other DTC on display
 
Check tumble generator valve (RH)
 

Trouble Code: P1094



Tumble Generated Valve Signal 1 Circuit Malfunction

Possible Causes:



Check harness between ECM and tumble generator valve actuator connector
 
Check poor contact
 

Trouble Code: P1095



Tumble Generated Valve Signal 1 Circuit Malfunction (short)

Possible Causes:



Check harness between ECM and tumble generator valve actuator connector
 

Trouble Code: P1096



Tumble Generated Valve Signal 2 Circuit Malfunction (open)

Possible Causes:



Check harness between ECM and tumble generator valve actuator connector
 
Check poor contact
 

Trouble Code: P1097



Tumble Generated Valve Signal 2 Circuit Malfunction (short)

Possible Causes:



Check harness between ECM and tumble generator valve actuator connector
 

Trouble Code: P1100



Starter Switch Circuit Malfunction

Possible Causes:



Check starter motor
 

Trouble Code: P1101



Neutral Position Switch Circuit Malfunction

Possible Causes:



Check input signal for ECM
 
Check harness between ECM and transmission harness connector
 
Check inhibitor switch
 

Trouble Code: P1102



Pressure Sources Switching Solenoid Valve Circuit Malfunction

Possible Causes:



Check output signal from ECM
 
Check harness between ECM and pressure sources switching solenoid valve connector
 
Check valve
 
Check power supply to valve
 

Trouble Code: P1103



Engine Torque Control Signal Circuit Malfunction

Possible Causes:



Check input signal of ECM
 
Check harness between ECM and TCM connector
 

Trouble Code: P1106



Engine Torque Control Signal 2 Circuit

Possible Causes:



Check input signal of ECM
 
Check poor contact
 
Check harness between ECM and TCM connector
 

Trouble Code: P1110



Atmospheric Pressure Sensor Circuit Low Input

Possible Causes:



Using the a scan tool, check current data
 
Check poor contact
 
Check input signal for ECM
 
Check harness between ECM and atmospheric pressure sensor connector
 

Trouble Code: P1111



Atmospheric Pressure Sensor Circuit High Input

Possible Causes:



Using the a scan tool, check current data
 
Check input signal for ECM
 
Check harness between ECM and pressure sensor connector
 

Trouble Code: P1112



Atmospheric Pressure Sensor Circuit Range/Performance Problem

Possible Causes:



Check input signal for ECM
 
Check harness between ECM and pressure sensor connector
 
Check any other DTC on display
 
Check sensor filter
 
Using the a scan tool, check current data
 

Trouble Code: P1115



Engine Torque Control Cut Signal Circuit High Input

Possible Causes:



Check output signal from ECM
 
Check harness between ECM and TCM connector
 

Trouble Code: P1116



Engine Torque Control Cut Signal Circuit Low Input

Possible Causes:



Check output signal from ECM
 
Check harness between ECM and TCM connector
 

Trouble Code: P1120



Starter Circuit Switch High Input

Possible Causes:



Check operation of starter motor
 

Trouble Code: P1121



Starter Circuit Switch High Input

Possible Causes:



Check transmission type (manual transaxle)
 
Check input signal of ECM
 
Check poor contact
 
Check neutral position sensor
 
Check harness between ECM and sensor connector
 
Check any other DTC on display
 
Check harness between ECM and transmission harness connector
 
Check inhibitor switch
 
Check selector cable connection
 

Trouble Code: P1122



Pressure Sources Switching Solenoid Valve High Input

Possible Causes:



Check output signal of ECM
 
Check poor contact
 
Check harness between ECM and valve connector
 
Check valve
 

Trouble Code: P1130



Front Oxygen Sensor Circuit Malfunction

Possible Causes:



Check harness between ECM and sensor connector
 
Check poor contact
 

Trouble Code: P1131



Front Oxygen Sensor Circuit Malfunction (short circuit)

Possible Causes:



Check harness between ECM and sensor connector
 
Check output signal for ECM
 

Trouble Code: P1132



Front Oxygen Sensor Heater Circuit Low Input

Possible Causes:



Check any other DTC on display
 
Check power supply circuit of ECM
 
Check ground circuit of ECM
 
Check power supply of front sensor
 
Check sensor
 

Trouble Code: P1133



Front Oxygen Sensor Heater Circuit High Input

Possible Causes:



Check output signal from ECM
 
Check sensor heater current
 

Trouble Code: P1134



Front Oxygen Sensor Micro Computer Problem

Possible Causes:



Check any other DTC on display
 

Trouble Code: P1137



O2 Sensor Circuit (bank 1 sensor 1)

Possible Causes:



Check any other DTC on display
 
Using a scan tool, check current data
 
Check front sensor
 
Check harness between ECM and sensor
 
Check exhaust system
 

Trouble Code: P1141



Mass Air Flow Sensor Circuit Range/Performance Problem (high output)

Possible Causes:



Check any other DTC on display
 

Trouble Code: P1142



Throttle Position Sensor Circuit Range/Performance Problem (low input)

Possible Causes:



Check any other DTC on display
 

Trouble Code: P1143



Pressure Sensor Circuit range/Performance Problem (low input)

Possible Causes:



Using a scan tool, check current data
 
Check pressure sensor
 

Trouble Code: P1144



Pressure Sensor Circuit range/Performance Problem (high input)

Possible Causes:



Using a scan tool, check current data
 

Trouble Code: P1146



Pressure Sensor Circuit range/Performance Problem (high input)

Possible Causes:



Check any other DTC on display
 
Check air intake system
 
Check pressure sensor
 
Check throttle position
 

Trouble Code: P1151



Rear Oxygen Sensor Heater Circuit High Input

Possible Causes:



Check input signal for ECM
 
Check any other DTC on display
 

Trouble Code: P1152



Bank 1 and Sensor 2 Oxygen Sensor (front right) Circuit Range/Performance Problem Low Input

Possible Causes:



Check any other DTC on display
 
Using a scan tool, check current data
 
Check rear sensor signal
 
Check exhaust system
 

Trouble Code: P1153



Bank 1 and Sensor 1 Oxygen Sensor (front right) Circuit Range/Performance Problem High Input

Possible Causes:



Check any other DTC on display
 
Using a scan tool, check current data
 
Check rear sensor signal
 
Check exhaust system
 

 
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