Subaru Car 1998-05

2.5L H4 VIN 6 Auto 2

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Trouble Code: P0304



Cylinder 4 Misfire Detected

Possible Causes:



Check any other DTC on display
 
Check output signal of ECM
 
Check harness between injector and ECM connector
 
Check fuel injector
 
Check power supply line
 
Check power supply to mass air flow sensor
 
Check harness between ECM and sensor connector
 
Check installation of camshaft and crankshaft sensors
 
Check crank plate
 
Check condition of timing chain
 
Check fuel level
 
Check status of MIL light
 
Check air intake system
 
Check cause of misfire (engine running)
 
Check engine condition
 
Check all cylinders individually, in pairs, in groups and at random
 

Trouble Code: P0325



Knock Sensor 1 Circuit Malfunction

Possible Causes:



Check harness between knock sensor 1 and ECM connector
 
Check sensor
 
Check input signal of ECM
 

Trouble Code: P0335



Crankshaft Position Sensor -A- Circuit

Possible Causes:



Check harness between the sensor and the ECM connector
 
Check condition of the sensor
 
Check the sensor
 

Trouble Code: P0336



Crankshaft Position Sensor -A- Circuit range/Performance

Possible Causes:



Check any other DTC on display
 
Check condition of the sensor
 
Check the crankshaft plate
 
Check timing chain
 

Trouble Code: P0340



Camshaft Position Sensor -A- Circuit Bank 1 or Single Sensor

Possible Causes:



Check any other DTC on display
 
Check power supply
 
Check harness between sensor connector and ECM
 
Check sensor installation and condition
 
Check the sensor
 
Check for poor contact
 

Trouble Code: P0341



Camshaft Position Sensor -A- Circuit Range/Performance Bank 1 or Single Sensor

Possible Causes:



Check any other DTC on display
 
Check harness between sensor connector and ECM
 
Check sensor installation and condition
 
Check the sensor
 
Check the cam sprocket
 
Check the installation and condition of the timing belt
 

Trouble Code: P0400



Exhaust Gas Recirculation Flow Malfunction

Possible Causes:



Check any other DTC on display
 
Check EGR control solenoid valve circuit
 
Check vacuum line
 
Check EGR system
 

Trouble Code: P0420



Catalyst System Efficiency Below Threshold Bank 1

Possible Causes:



Check any other DTC on display
 
Check harness between ECM and rear oxygen sensor connector
 
Check exhaust system
 

Trouble Code: P0440



Evaporative Emission Control System Malfunction

Possible Causes:



Check fuel filler cap
 
Check fuel filler pipe packing
 
Check purge control valve solenoid
 
Check evaporative emission control system line
 
Check canister
 
Check fuel tank
 
Check any other mechanical components in the evaporative control system
 

Trouble Code: P0441



Evaporative Emission Control System Indirect Purge Flow

Possible Causes:



Check any other DTC on display
 
Check purge control valve solenoid operation
 
Check purge control valve
 

Trouble Code: P0442



Evaporative Emission Control System Leak Detected (small leak)

Possible Causes:



Check any other DTC on display
 
Check fuel filler cap
 
Check fuel filler pipe packing
 
Check the drain valve
 
Check the purge control solenoid valve
 
Check the pressure control solenoid valve
 
Check evaporative emission control system line
 
Check canister
 
Check fuel tank
 
Check any other mechanical components in the evaporative control system
 

Trouble Code: P0443



Evaporative Emission Control System Purge Control Valve Circuit Low Input

Possible Causes:



Check output signal from ECM
 
Check harness between purge control solenoid valve and ECM connector
 
Check the purge control solenoid valve
 
Check power supply to purge control solenoid valve
 
Check evaporative emission control system line
 
Check poor contact
 

Trouble Code: P0446



Evaporative Emission Control System Purge Control Valve Circuit High Input

Possible Causes:



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

Trouble Code: P0451



Evaporative Emission Control System Pressure Sensor Malfunction

Possible Causes:



Check any other DTC on display
 
Check fuel filler cap
 
Check pressure vacuum line
 

Trouble Code: P0452



Evaporative Emission Control System Pressure Sensor Low Input

Possible Causes:



Using a scan tool, check current data
 
Check power supply to fuel tank pressure sensor
 
Check input signal to ECM
 
Check harness between ECM and coupling connector in rear wiring harness
 
Check fuel tank cord
 
Check the purge control solenoid valve
 
Check poor contact
 

Trouble Code: P0453



Evaporative Emission Control System Pressure Sensor Low Input

Possible Causes:



Using a scan tool, check current data
 
Check power supply to fuel tank pressure sensor
 
Check input signal to ECM
 
Check harness between ECM and coupling connector in rear wiring harness
 
Check fuel tank cord
 
Check poor contact
 
Check harness between ECM and fuel tank pressure sensor connector
 

Trouble Code: P0461



Evaporative Emission System Purge Control Valve Circuit High

Possible Causes:



Check any other DTC on display
 

Trouble Code: P0462



Evaporative Emission Control System Leak Detected

Possible Causes:



Check speedometer and tachometer operation
 
Check input signal of ECM
 
Check input voltage from ECM
 
Check harness between ECM and combination meter connector
 
Check fuel tank cord
 
Check fuel level sensor
 
Check fuel sub level sensor
 

Trouble Code: P0463



Fuel Level Sensor -A- Circuit High

Possible Causes:



Check speedometer and tachometer operation
 
Check input signal of ECM
 
Check input voltage from ECM
 
Check harness between ECM and fuel tank cord
 
Check harness between fuel tank cord and ground
 
Check fuel tank cord
 
Check fuel level sensor
 
Check fuel sub level sensor
 

Trouble Code: P0480



Cooling Fan relay 1 Circuit Low Input

Possible Causes:



Check output signal from ECM
 
Check ground short circuit min radiator fan relay 1 control circuit
 
Check power supply for relay
 
Check main fan relay
 
Check for open circuit in main fan relay control circuit
 
Check poor contact
 

Trouble Code: P0483



Fan Rationality Check

Possible Causes:



Check any other DTC on display
 

Trouble Code: P0500



Vehicle Speed Sensor

Possible Causes:



Check DTC of VDC
 

Trouble Code: P0505



Idle Control System Malfunction

Possible Causes:



Check air intake system
 
Check output signal from ECM
 
Check idle air control solenoid valve
 
Check harness between ECM and idle air control solenoid valve connector
 

Trouble Code: P0506



Idle Control System RPM Lower Than Expected

Possible Causes:



Check any other DTC on display
 
Check air cleaner element
 
Check electronic throttle control
 

Trouble Code: P0507



Idle Control System RPM Higher Than Expected

Possible Causes:



Check any other DTC on display
 
Check air intake system
 
Check electronic throttle control
 

Trouble Code: P0600



Serial Communication Link

Possible Causes:



Check engine start failure (does engine run)
 
Check illumination of MIL light
 
Check indication of DTC on display
 
Using the a scan tool, perform diagnosis
 

Trouble Code: P0601



Internal Control Module Memory Check Sum Error

Possible Causes:



Check any other DTC on display
 

Trouble Code: P0703



Torque Converter/Brake Switch -B- Circuit

Possible Causes:



Check operation of brake light
 
Check harness between TCM and brake light switch connector
 
Check input signal for TCM
 
Check poor contact
 

Trouble Code: P0705



Transmission Range Sensor Circuit (PRNDL input)

Possible Causes:



Using the a scan tool, read the data
 

Trouble Code: P0710



Transmission Fluid Temperature Sensor

Possible Causes:



Using the a scan tool, read the data
 

Trouble Code: P0715



Torque Converter Turbine Speed Sensor Circuit Malfunction

Possible Causes:



Using the a scan tool, read the data
 

Trouble Code: P0720



Output Speed Sensor Circuit

Possible Causes:



Using a scan tool, read the data
 

Trouble Code: P0725



Engine Speed Input Circuit Malfunction

Possible Causes:



Using the a scan tool, read the data
 

Trouble Code: P0731



Gear 1 Incorrect Ratio

Possible Causes:



Check any other DTC on display
 
Check throttle position sensor circuit
 
Check front VSS circuit
 
Check torque converter turbine speed sensor circuit
 
Check poor contact
 
Check for mechanical problems
 

Trouble Code: P0732



Gear 2 Incorrect Ratio

Possible Causes:



Check any other DTC on display
 
Check throttle position sensor circuit
 
Check front VSS circuit
 
Check torque converter turbine speed sensor circuit
 
Check poor contact
 
Check for mechanical problems
 

Trouble Code: P0733



Gear 3 Incorrect Ratio

Possible Causes:



Check any other DTC on display
 
Check throttle position sensor circuit
 
Check front VSS circuit
 
Check torque converter turbine speed sensor circuit
 
Check poor contact
 
Check for mechanical problems
 

Trouble Code: P0734



Gear 4 Incorrect Ratio

Possible Causes:



Check any other DTC on display
 
Check throttle position sensor circuit
 
Check front VSS circuit
 
Check torque converter turbine speed sensor circuit
 
Check poor contact
 
Check for mechanical problems
 

Trouble Code: P0740



Torque Converter Clutch System Malfunction

Possible Causes:



Check any other DTC on display
 
Check lock up duty solenoid circuit
 
Check throttle position sensor circuit
 
Check torque converter turbine speed sensor circuit
 
Check engine speed input circuit
 
Check brake light switch circuit
 
Check ATF temperature sensor circuit
 
Check poor contact
 
Check for mechanical problems
 

Trouble Code: P0743



Torque Converter Clutch System (lock up duty solenoid) Electrical

Possible Causes:



Using the a scan tool, read the data
 

Trouble Code: P0748



Pressure Control Solenoid (line pressure duty solenoid) Electrical

Possible Causes:



Using the a scan tool, read the data
 

 
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