AutoZone 1995 Toyota Paseo 1.5L EFI DOHC 4cyl | Repair Guides | Diagnostics | Diagnostic Trouble Codes | 4.6l V8 Vin 9 Auto 4 | AutoZone.com

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    Ford Crown Victoria, Mercury Grand Marquis, Marauder, Lincoln Town Car 1999-2005

    4.6L V8 VIN 9 Auto 4

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    Trouble Code: P0401



    Insufficient EGR Flow Detected

    Possible Causes:



    DPFE sensor signal circuit is shorted to ground
     
    DPFE sensor VREF circuit is open between sensor and PCM
     
    DPFE sensor downstream hose off or plugged
     
    DPFE sensor hoses both off, loose or damaged
     
    DPFE sensor hoses connected wrong (reversed)
     
    EGR orifice tube is damaged or restricted
     

    Trouble Code: P0402



    Excessive EGR Flow Detected

    Possible Causes:



    DPFE EGR valve source hoses loose or connected wrong
     
    DPFE sensor slow to respond or sluggish (it may have failed)
     
    DPFE sensor signal circuit is open or shorted to ground
     
    DPFE EGR sensor is damaged or the PCM has failed
     

    Trouble Code: P0403



    Exhaust Gas Recirculation (EGR) Control Circuit

    Possible Causes:



    EEGR motor windings open
     
    Connector to EEGR not seated
     
    Open circuit in the harness from the PCM to the EEGR
     
    Short circuit in the EEGR motor
     
    Short circuit in the harness from the PCM to the EEGR
     
    Damaged PCM
     
    EGRVR circuit open
     
    VPWR open to EGRVR solenoid
     
    EVR circuit short to voltage or ground
     
    Damaged EGRVR solenoid
     

    Trouble Code: P0405



    Exhaust Gas Recirculation (EGR) Sensor A Circuit Low

    Possible Causes:



    DPFE circuit short to ground
     
    Damaged DPFEGR sensor
     
    VREF circuit short to ground
     

    Trouble Code: P0406



    Exhaust Gas Recirculation (EGR) Sensor A Circuit High

    Possible Causes:



    Differential pressure feedback EGR (DPFEGR) circuit open
     
    VREF circuit short to voltage
     
    Damaged DPFEGR sensor
     
    DPFE circuit short to voltage
     
    SIG RTN circuit open
     

    Trouble Code: P0410



    Secondary Air Injection (AIR) System

    Possible Causes:



    AIR inlet hose leak
     
    AIR inlet hose disconnected
     

    Trouble Code: P0411



    Secondary AIR System Incorrect Upstream Flow Detected

    Possible Causes:



    Air pump output is blocked
     
    AIR bypass solenoid leaking or blocked
     
    AIR bypass solenoid is stuck open or stuck closed
     
    Air injection pump hose(s) leaking
     
    PCM has failed
     

    Trouble Code: P0412



    Secondary Air Injection Solenoid Circuit Malfunction

    Possible Causes:



    AIR solenoid power circuit (B+) is open (check dedicated fuse)
     
    AIR bypass solenoid control circuit is open or shorted to ground
     
    AIR diverter solenoid control circuit open or shorted to ground
     
    AIR pump control circuit is open or shorted to ground
     
    Check valve (one or more) is damaged or leaking
     
    Solid State relay is damaged or it has failed
     
    PCM has failed
     

    Trouble Code: P0420



    Catalyst System Efficiency Bank 1 Below Threshold

    Possible Causes:



    Air leaks at the exhaust manifold or in the exhaust pipes
     
    Catalytic converter is damaged, contaminated or it has failed
     
    ECT/CHT sensor has lost its calibration (the signal is incorrect)
     
    Engine cylinders misfiring, or the ignition timing is over retarded
     
    Engine oil is contaminated
     
    Front HO2S or rear HO2S is contaminated with fuel or moisture
     
    Front HO2S and/or the rear HO2S is loose in the mounting hole
     
    Front HO2S much older than the rear HO2S (HO2S-11 is lazy)
     
    Fuel system pressure is too high (check the pressure regulator)
     
    Rear HO2S wires improperly connected or the HO2S has failed
     

    Trouble Code: P0430



    Catalyst System Efficiency Bank 2 Below Threshold

    Possible Causes:



    Air leaks at the exhaust manifold or in the exhaust pipes
     
    Catalytic converter is damaged, contaminated or it has failed
     
    ECT/CHT sensor has lost its calibration (the signal is incorrect)
     
    Engine cylinders misfiring, or the ignition timing is over retarded
     
    Engine oil is contaminated
     
    Front HO2S or rear HO2S is contaminated with fuel or moisture
     
    Front HO2S and/or the rear HO2S is loose in the mounting hole
     
    Front HO2S much older than the rear HO2S (HO2S-11 is lazy)
     
    Fuel system pressure is too high (check the pressure regulator)
     
    Rear HO2S wires improperly connected or the HO2S has failed
     

    Trouble Code: P0442



    EVAP Control System Small Leak Detected

    Possible Causes:



    Aftermarket EVAP parts that do not conform to specifications
     
    CV solenoid stays partially open when commanded to close
     
    EVAP component seals leaking (i.e., leaks in the Purge valve, fuel vapor control valve tube assembly or fuel vapor vent valve)
     
    Fuel filler cap damaged, cross-threaded or loosely installed
     
    Loose fuel vapor hose/tube connections to EVAP components
     
    Small holes or cuts in fuel vapor hoses or EVAP canister tubes
     

    Trouble Code: P0443



    EVAP Canister Purge Solenoid Circuit Malfunction

    Possible Causes:



    EVAP purge solenoid supply circuit is open
     
    EVAP purge solenoid control circuit open, shorted to ground
     
    EVAP purge solenoid control circuit is shorted to power (B+)
     
    EVAP canister purge solenoid valve is damaged or the PCM has failed
     

    Trouble Code: P0446



    EVAP Canister Vent System Performance

    Possible Causes:



    Canister vent (CV) solenoid is stuck closed (partially or fully)
     
    EVAP canister purge outlet tube blocked or kinked between the canister purge valve and the EVAP canister, or EVAP canister tube blocked between the fuel tank and canister
     
    EVAP canister restricted, or plugged CV solenoid filter unit
     
    Plugged or contaminated CV solenoid filter
     
    EVAP canister purge valve stuck open
     
    Fuel filler cap stuck closed (no vacuum relief)
     
    FTP sensor VREF circuit open, or FTP sensor is damaged
     
    Fuel vapor elbow at the EVAP canister contaminated
     

    Trouble Code: P0451



    Fuel Tank Pressure Sensor Intermittent Signal

    Possible Causes:



    FTP sensor signal circuit has an intermittent open condition
     
    FTP sensor signal circuit has an intermittent shorted condition
     
    FTP sensor is damaged or it has failed
     

    Trouble Code: P0452



    FTP Sensor Circuit Low Input

    Possible Causes:



    FTP sensor signal circuit is open or the ground circuit is open
     
    FTP sensor signal circuit is shorted to VREF (5v)
     
    FTP sensor is damaged or the PCM has failed
     

    Trouble Code: P0453



    FTP Sensor Circuit High Input

    Possible Causes:



    FTP sensor signal circuit is open or the ground circuit is open
     
    FTP sensor signal circuit is shorted to VREF (5v)
     
    FTP sensor is damaged or the PCM has failed
     

    Trouble Code: P0454



    Evaporative Emission System Pressure Sensor/Switch Intermittent

    Possible Causes:



    Intermittent open or short in the fuel tank pressure (FTP) sensor or the FTP sensor signal
     
    Contaminated or damaged sensor
     

    Trouble Code: P0455



    EVAP Control System Large Leak Detected

    Possible Causes:



    Aftermarket EVAP hardware non-conforming to specifications
     
    Canister vent (CV) solenoid stuck open
     
    EVAP canister purge valve stuck closed, or canister damaged
     
    EVAP canister tube, EVAP canister purge outlet tube or EVAP return tube disconnected or cracked, or canister is damaged
     
    Fuel filler cap missing, loose (not tightened) or the wrong part
     
    Loose fuel vapor hose/tube connections to EVAP components
     
    Purge sensor or FTP sensor is out of calibration or has failed
     

    Trouble Code: P0456



    EVAP Control System Very Small Leak (0.020") Detected

    Possible Causes:



    Canister tube, EVAP canister purge outlet tube or return tube disconnected or cracked
     
    EVAP canister purge valve stuck closed, or canister damaged
     
    Fuel vapor hoses/tubes that have very small holes and/or cuts
     
    Fuel vapor hose/tube connections are loose or damaged
     
    EVAP component seals are leaking (i.e., Purge valve, fuel tank pressure sensor, canister vent solenoid, fuel vapor control valve tube assembly or fuel vapor vent valve assembly)
     
    TSB 03-9-8 contains a repair procedure for this trouble code
     
    TSB 3-20-3 contains a repair procedure for this trouble code
     

    Trouble Code: P0457



    EVAP Control System Leak Detected (Fuel Cap Missing)

    Possible Causes:



    Fuel filler cap not installed after refueling (CMC P0457 is set)
     
    Fuel filler cap missing, loose or cross-threaded
     

    Trouble Code: P0460



    Fuel Level Sensor Signal Range/Performance

    Possible Causes:



    Fuel tank is empty
     
    FP module is stuck open
     
    Fuel gauge is incorrectly installed
     
    Instrument cluster damaged
     
    PCM Case ground circuit open
     
    Fuel level indicator (FLI) circuit is shorted to power, or is open
     
    Fuel tank has been overfilled, or fuel gauge is damaged
     
    Fuel pump (FP) module is stuck closed, or is stuck open
     
    Fuel level indicator circuit shorted to Case or to power ground
     
    PCM Case ground shorted to VPWR (shorted to system power)
     

    Trouble Code: P0461



    Fuel Level Sensor A Circuit Range/Performance

    Possible Causes:



    Fuel level sensor circuit intermittent
     
    FLI signal line open circuit
     

    Trouble Code: P0462



    Fuel Level Sensor Circuit Low Input

    Possible Causes:



    Fuel tank is empty
     
    FLI signal circuit is open
     
    FLI signal circuit is shorted to case or chassis ground
     
    PCM has failed
     

    Trouble Code: P0463



    Fuel Level Sensor Circuit High Input

    Possible Causes:



    Fuel level sensor connector is damaged or shorted
     
    Fuel tank has been over-filled
     
    FLI signal circuit is shorted to VREF (5v or 12v)
     
    PCM has failed
     

    Trouble Code: P0480



    Fan 1 Control Circuit

    Possible Causes:



    Open or shorted LFC circuit
     
    Open VPWR circuit to the low speed FC relay
     
    Damaged low speed FC relay
     
    FCV circuit open or shorted
     
    B+ or ground circuit concern to cooling fan
     
    VPWR open to cooling fan (if applicable)
     
    Damaged cooling fan module
     
    FCV circuit open in the harness
     
    FCV circuit short to voltage or ground in the harness
     
    Damaged cooling fan clutch solenoid
     

    Trouble Code: P0481



    High Fan Control (HFC)/Fan Control 3 (FC3) Primary Circuit Malfunction

    Possible Causes:



    Open or shorted HFC circuit
     
    Open VPWR circuit to the high speed FC relay
     
    Damaged high speed FC relay
     

    Trouble Code: P0482



    Constant Control Relay Module Circuit Malfunction

    Possible Causes:



    FC relay control circuit is open
     
    FC relay control circuit is shorted to chassis ground
     
    FC relay power supply (VPWR) circuit is open
     
    FC relay direct battery (B+) circuit is open
     
    PCM has failed
     

    Trouble Code: P0483



    Variable Fan Control (FC V) Fan Performance

    Possible Causes:



    Cooling fan motor mechanical concerns
     
    Obstructions
     

    Trouble Code: P0491



    Secondary Air Injection (AIR) System Insufficient Flow (Bank 1)

    Possible Causes:



    Secondary AIR pump with no or low air flow
     
    Secondary AIR bypass solenoid leaking/blocked or stuck open/closed
     
    Secondary AIR diverter valve leaking/blocked or stuck open/closed
     
    Secondary AIR air hose restricted
     
    Secondary AIR vacuum hoes restricted or leaking
     

    Trouble Code: P050A



    Cold Start Idle Air Control Performance

    Possible Causes:



    IAC control circuit is open
     
    IAC control circuit is shorted to power (B+)
     
    IAC power supply circuit (VPWR) is open
     
    IAC solenoid is damaged or the PCM has failed
     

    Trouble Code: P050B



    Cold Start Ignition Timing Performance

    Possible Causes:



    Spark timing
     
    Spark capture circuit
     
    Spark timing monitor
     
    Spark capture circuit monitor
     

    Trouble Code: P0500



    Vehicle Speed Sensor Malfunction

    Possible Causes:



    Modules connected to VSC/VSS harness circuits are damaged
     
    Mechanical drive mechanism for the VSS or TCSS is damaged
     
    VSS+ or VSS- harness circuit is open
     
    TCSS signal or TCSS signal return harness circuit is open
     
    VSS harness circuit, TCSS harness circuit is shorted to ground
     
    VSS harness circuit, CSS harness circuit is shorted to power
     
    VSS circuit open between the PCM and related control module
     
    VSS or TCSS, or wheel speed sensors circuits are damaged
     

    Trouble Code: P0501



    Vehicle Speed Sensor or PSOM Range/Performance

    Possible Causes:



    VSS+ or VSS- signal circuit is open or shorted to ground
     
    TCSS signal or TCSS signal return harness circuit is open
     
    VSS harness circuit, TCSS harness circuit is shorted to ground
     
    VSS harness circuit, CSS harness circuit is shorted to power
     
    VSS circuit open between the PCM and related control module
     
    VSS or TCSS, or wheel speed sensors circuits are damaged
     
    Modules connected to VSC/VSS harness circuits are damaged
     
    Mechanical drive mechanism for the VSS or TCSS is damaged
     

    Trouble Code: P0503



    Vehicle Speed Sensor Signal Intermittent

    Possible Causes:



    Module or circuits connected to VSS/TCSS circuit are damaged
     
    VSS/TCSS wiring harness or connector is damaged or loose
     
    VSS/TCSS signal is "noisy" due to RFI or EMI interference from sources such as ignition components or charging system
     
    VSS/TCSS gears are damaged or there is debris on the sensor
     

    Trouble Code: P0505



    Idle Air Control System Malfunction

    Possible Causes:



    Air inlet dirty, restricted or the air cleaner is severely restricted
     
    IAC solenoid control circuit is open, shorted to ground or to B+
     
    IAC solenoid power circuit (VPWR) is open from the relay
     
    IAC valve is damaged or has failed
     
    PCM has failed
     
    TSB 03-3-5 contains repair information for this trouble code
     

    Trouble Code: P0506



    Idle Air Control System RPM Lower Than Expected

    Possible Causes:



    Air inlet is plugged or the air filter element is severely clogged
     
    IAC circuit is open or shorted to the VPWR circuit
     
    IAC circuit VPWR circuit is open
     
    IAC solenoid is damaged or has failed
     
    PCM has failed
     
    TSB 03-3-5 contains repair information for this trouble code
     

    Trouble Code: P0507



    Idle Air Control System RPM Higher Than Expected

    Possible Causes:



    Air intake leak located somewhere after the throttle body
     
    IAC control circuit is shorted to chassis ground
     
    IAC solenoid is damaged or has failed
     
    PCM has failed
     
    TSB 03-3-5 contains repair information for this trouble code
     

    Trouble Code: P0511



    Idle Air Control Valve Circuit Malfunction

    Possible Causes:



    IAC control circuit is open
     
    IAC control circuit is shorted to power (B+)
     
    IAC power supply circuit (VPWR) is open
     
    IAC solenoid is damaged or the PCM has failed
     

    Trouble Code: P0528



    Fan Speed Sensor Circuit No Signal

    Possible Causes:



    FSS VPWR circuit open in the harness
     
    FSS PWRGND circuit open in the harness
     
    FSS circuit open in the harness
     
    FSS circuit short to voltage or ground in the harness
     
    Damaged FSS sensor
     
    Damaged PCM
     

    Trouble Code: P0532



    Air Conditioning Pressure (ACP) Sensor Low Voltage Detected

    Possible Causes:



    ACP circuit short to GND or SIGRTN
     
    VREF circuit open
     
    Open ACP circuit
     
    Damaged ACP sensor
     

     
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