Subaru Forester 1998-05

2.5L H4 - Auto 3

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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: P0345



Camshaft Position Sensor -A- Circuit Bank 2

Possible Causes:



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

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: P0410



Secondary Air Injection System

Possible Causes:



Check air pump operation
 
Check duct between pump and combination valve
 
Check power supply to pump
 
Check harness between pump relay and pump connector
 
Check pump relay
 
Check pump relay power source
 
Check harness between ECM and pump relay connector
 

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: P0447



Evaporative Emission Control System Purge Control Valve Circuit High Input

Possible Causes:



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

Trouble Code: P0448



Evaporative Emission Control System Vent Control Circuit Shorted

Possible Causes:



Check input signal from ECM
 
Check poor contact
 
Check harness between drain valve and ECM connector
 
Check 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: P0456



Evaporative Emission Control System Pressure Sensor Low Input

Possible Causes:



Check any other DTC on display
 
Check fuel filler cap
 
Check fuel filler pipe packing
 
Check drain valve
 
Check purge control solenoid valve
 
Check pressure control solenoid valve
 
Check harness between ECM and fuel tank pressure sensor connector
 
Check evaporative emission control system line
 
Check canister
 
Check any other mechanical component in the system
 

Trouble Code: P0457



Evaporative Emission Control System Leak Detected

Possible Causes:



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

Trouble Code: P0458



Evaporative Emission System Purge Control Valve Circuit Low

Possible Causes:



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

Trouble Code: P0459



Evaporative Emission System Purge Control Valve Circuit High

Possible Causes:



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

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: P0464



Fuel level Sensor Circuit Intermittent

Possible Causes:



Check any other DTC on display
 
Check fuel level sensor
 
Check fuel level sub 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: P0502



Vehicle Speed Sensor Circuit Low Input

Possible Causes:



Check to be sure vehicle is equipped with automatic transaxle
 
Check poor contact
 
Check harness between ECM and TCM connector
 
Check harness between VSS and ECM connector
 

Trouble Code: P0503



Vehicle Speed Sensor Intermittent/Erratic/High

Possible Causes:



Check speedometer operation in combination meter
 
Check harness between ECM and combination meter connector
 

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: P0512



Starter Request Circuit

Possible Causes:



Check starter motor
 

Trouble Code: P0519



Idle Control System Malfunction (fail safe)

Possible Causes:



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

Trouble Code: P0565



Cruise Control ON Signal

Possible Causes:



Check harness between TCM and CCM connector
 
Check input signal for TCM (on AWD vehicles raise wheels off the ground)
 
Check poor contact
 

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: P0604



Internal Control Module Random Access Memory (RAM) Error

Possible Causes:



Check any other DTC on display
 

Trouble Code: P0605



Internal Control Module Read Only Memory (ROM) Error

Possible Causes:



Check input voltage from ECM
 
Check ground harness
 

Trouble Code: P0607



Control Module Performance

Possible Causes:



Check input voltage from ECM
 
Check ground harness
 

Trouble Code: P0638



Throttle Actuator Control range/Performance Bank 1

Possible Causes:



Check electronic throttle control relay
 
Check power supply of electronic control relay
 
Check harness between ECM and electronic throttle control relay
 
Check sensor output
 
Check poor contact
 
Check harness between ECM and electronic throttle control
 
Check sensor power supply
 
Check for short in ECM
 
Check sensor output
 
Check harness between ECM and electronic throttle control motor
 
Check electronic throttle control motor harness
 
Check ground circuit
 
Check electronic throttle control
 

 
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