Subaru Car 1998-05

2.5L H4 - Auto 6

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Trouble Code: P1422



Evaporative Emission Control System Purge Control Valve Circuit High Input

Possible Causes:



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

Trouble Code: P1423



Evaporative Emission Control System Vent Control High Input

Possible Causes:



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

Trouble Code: P1440



Fuel Tank Pressure Control System Function Problem (low input)

Possible Causes:



Check fuel tank pressure control solenoid valve
 
Check fuel filler cap
 
Check fuel filler pipe seal
 
Check vent control solenoid valve
 
Check purge control solenoid valve
 

Trouble Code: P1441



Fuel Tank Pressure Control System Function Problem (high input)

Possible Causes:



Check fuel tank pressure control solenoid valve
 
Check fuel filler cap
 
Check fuel filler pipe seal
 
Check vent control solenoid valve
 
Check purge control solenoid valve
 
Check canister
 
Check fuel tank
 
Check for other mechanical problems
 

Trouble Code: P1442



Fuel level Sensor Circuit Range/Performance Problem 2

Possible Causes:



Check any other DTC on display
 

Trouble Code: P1443



Vent Control Solenoid Valve Function Problem

Possible Causes:



Check any other DTC on display
 
Check vent line hoses
 
Check drain valve operation
 

Trouble Code: P1445



Air Assist Injector Solenoid Valve Malfunction

Possible Causes:



Check any other DTC on display
 
Check air assist injector solenoid valve operation
 
Check air by passes hoses
 
Check fuel injector
 

Trouble Code: P1446



Fuel Tank Sensor Control Valve Circuit Low

Possible Causes:



Check output signal from ECM
 
Check poor contact
 
Check harness between fuel tank sensor control valve and ECM connector
 
Check fuel tank sensor control valve
 
Check power supply to fuel tank sensor control valve
 

Trouble Code: P1447



Fuel Tank Sensor Control Valve Circuit High

Possible Causes:



Check output signal from ECM
 
Check poor contact
 
Check harness between fuel tank sensor control valve and ECM connector
 
Check fuel tank sensor control valve
 

Trouble Code: P1448



Fuel Tank Sensor Control Valve Range/Performance

Possible Causes:



Check for other DTC on display
 
Check fuel filler cap
 
Check evaporative emission line
 

Trouble Code: P1480



Cooling Fan Relay 1 Circuit High Input

Possible Causes:



Using a scan tool, check current data
 
Check for short circuit in radiator fan relay control circuit
 
Check main fan relay
 
Check sub fan relay
 
Check poor contact
 

Trouble Code: P1490



Thermostat Malfunction

Possible Causes:



Check vehicle condition
 
Check other DTC on display
 
Check engine coolant
 
Check radiator fan
 

Trouble Code: P1491



Positive Crankcase Ventilation (blow by) Function problem

Possible Causes:



Check blow by hose
 
Check harness between PCV diagnosis connector and ECM connector
 
Inspect PCV diagnosis connector
 

Trouble Code: P1492



EGR Solenoid Valve Signal #1 Circuit Malfunction (low input)

Possible Causes:



Check power supply to EGR solenoid
 
Check harness between ECM and EGR solenoid valve connector
 
Check poor contact
 

Trouble Code: P1493



EGR Solenoid Valve Signal #1 Circuit Malfunction (high input)

Possible Causes:



Check other DTC on display
 
Check harness between ECM and EGR solenoid valve connector
 

Trouble Code: P1494



EGR Solenoid Valve Signal #2 Circuit Malfunction (low input)

Possible Causes:



Check power supply to EGR solenoid
 
Check harness between ECM and EGR solenoid valve connector
 
Check poor contact
 

Trouble Code: P1495



EGR Solenoid Valve Signal #2 Circuit Malfunction (high input)

Possible Causes:



Check other DTC on display
 
Check harness between ECM and EGR solenoid valve connector
 

Trouble Code: P1496



EGR Solenoid Valve Signal #3 Circuit Malfunction (low input)

Possible Causes:



Check power supply to EGR solenoid
 
Check harness between ECM and EGR solenoid valve connector
 
Check poor contact
 

Trouble Code: P1497



EGR Solenoid Valve Signal #3 Circuit Malfunction (high input)

Possible Causes:



Check other DTC on display
 
Check harness between ECM and EGR solenoid valve connector
 

Trouble Code: P1498



EGR Solenoid Valve Signal #4 Circuit Malfunction (low input)

Possible Causes:



Check power supply to EGR solenoid
 
Check harness between ECM and EGR solenoid valve connector
 
Check poor contact
 

Trouble Code: P1499



EGR Solenoid Valve Signal #4 Circuit Malfunction (high input)

Possible Causes:



Check other DTC on display
 
Check harness between ECM and EGR solenoid valve connector
 

Trouble Code: P1505



Idle Control System Circuit High Input

Possible Causes:



Check throttle cable
 
Check output signal from ECM
 

Trouble Code: P1507



Idle Control System Malfunction (fail safe)

Possible Causes:



Check any other DTC on display
 
Check air intake system
 

Trouble Code: P1510



ISC Solenoid Valve Signal #1 Circuit Malfunction (low input)

Possible Causes:



Check power supply to idle air control solenoid valve
 
Check harness between ECM and idle control solenoid valve connector
 
Check poor contact
 

Trouble Code: P1511



ISC Solenoid Valve Signal #1 Circuit Malfunction (high input)

Possible Causes:



Check any other DTC on display
 
Check ground circuit for ECM
 
Check harness between ECM and idle control solenoid valve connector
 

Trouble Code: P1512



ISC Solenoid Valve Signal #2 Circuit Malfunction (low input)

Possible Causes:



Check power supply to idle air control solenoid valve
 
Check harness between ECM and idle control solenoid valve connector
 
Check poor contact
 

Trouble Code: P1513



ISC Solenoid Valve Signal #2 Circuit Malfunction (high input)

Possible Causes:



Check any other DTC on display
 
Check ground circuit for ECM
 
Check harness between ECM and idle control solenoid valve connector
 

Trouble Code: P1514



ISC Solenoid Valve Signal #3 Circuit Malfunction (low input)

Possible Causes:



Check power supply to idle air control solenoid valve
 
Check harness between ECM and idle control solenoid valve connector
 
Check poor contact
 

Trouble Code: P1515



ISC Solenoid Valve Signal #3 Circuit Malfunction (high input)

Possible Causes:



Check any other DTC on display
 
Check ground circuit for ECM
 
Check harness between ECM and idle control solenoid valve connector
 

Trouble Code: P1516



ISC Solenoid Valve Signal #4 Circuit Malfunction (low input)

Possible Causes:



Check power supply to idle air control solenoid valve
 
Check harness between ECM and idle control solenoid valve connector
 
Check poor contact
 

Trouble Code: P1517



ISC Solenoid Valve Signal #4 Circuit Malfunction (high input)

Possible Causes:



Check any other DTC on display
 
Check ground circuit for ECM
 
Check harness between ECM and idle control solenoid valve connector
 

Trouble Code: P1518



Starter Switch Circuit Low Input

Possible Causes:



Check operation of starter motor
 

Trouble Code: P1520



Cooling Fan Relay 1 Circuit High Input

Possible Causes:



Check output signal of ECM
 
Check for short circuit in radiator fan relay control circuit
 
Check main fan relay
 
Check sub fan relay
 
Check poor contact
 

Trouble Code: P1540



Vehicle Speed Sensor Malfunction 2

Possible Causes:



Check transaxle type (automatic)
 
Check any other DTC on display
 
Check speedometer operation in combination meter
 
Check harness between ECM and combination meter connector
 

Trouble Code: P1544



Exhaust Gas Temperature Too High

Possible Causes:



Check any other DTC on display
 
Check exhaust system
 

Trouble Code: P1560



Back-Up Voltage Circuit Malfunction

Possible Causes:



Check input signal of ECM
 
Check harness between ECM and main fuse box connector
 
Check fuse number 13
 

Trouble Code: P1590



Neutral Position Switch Circuit High Output

Possible Causes:



Check any other DTC on display
 
Check input signal of ECM
 
Check poor contact
 
Check harness between ECM and inhibitor switch connector
 
Check switch ground
 
Check switch
 
Check selector cable connection
 

Trouble Code: P1591



Neutral Position Switch Circuit Low Output

Possible Causes:



Check any other DTC on display
 
Check input signal of ECM
 
Check harness between ECM and transmission harness connector
 
Check switch
 
Check selector cable connection
 

Trouble Code: P1594



Automatic Transaxle Diagnosis Input Signal Circuit Malfunction

Possible Causes:



Check driving condition (shift control function)
 
Check vehicle accessories for grounding (car phone, CB etc)
 

Trouble Code: P1595



Automatic Transaxle Diagnosis Input Signal Circuit Low Input

Possible Causes:



Check harness between ECM and TCM connector
 
Check output signal for ECM
 
Check any other DTC on display
 

 
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