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    1968 Toyota Corona 1.9L 2BL 4cyl

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    Mazda Tribute 2001-06

    2.3L L4 VIN D Std 5

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    Trouble Code: P1400



    EGR Valve Position Sensor Circuit Low Input (Self-Test)

    Possible Causes:



    EGRP sensor signal circuit is shorted to ground
     
    EGRP sensor power circuit is open
     
    EGRP sensor is damaged or has failed
     
    PCM has failed
     

    Trouble Code: P1401



    EGR Valve Position Sensor Circuit High Input (Self-Test)

    Possible Causes:



    EGRP sensor signal circuit is open
     
    EGRP sensor ground circuit is open
     
    EGRP sensor is damaged or has failed
     
    PCM has failed
     

    Trouble Code: P1405



    DPFE Sensor Upstream Hose Off or Plugged

    Possible Causes:



    DPF EGR sensor upstream hose is disconnected
     
    DPF EGR sensor upstream hose is plugged (ice)
     
    EGR orifice tube is plugged or damaged
     

    Trouble Code: P1408



    EGR System Flow Out Of Range (Self-Test)

    Possible Causes:



    EGR valve stuck closed or iced up, or the flow path is restricted
     
    EGR valve diaphragm leaking, hose is off, plugged or leaking
     
    EGR system vacuum lines are loose or damaged
     
    EGRA solenoid is damaged or has failed
     
    EGRV solenoid is damaged or has failed
     
    PCM has failed
     

    Trouble Code: P1443



    EVAP System Purge Flow Malfunction

    Possible Causes:



    Fuel vapor hose blocked between EVAP purge valve and FTP sensor, or blocked between purge valve and intake manifold, or vacuum hose blocked between purge valve and intake manifold
     
    EVAP canister purge solenoid stuck closed (mechanically)
     

    Trouble Code: P1450



    EVAP Control System Excessive Vacuum Detected

    Possible Causes:



    Air filter element is extremely dirty or clogged
     
    Canister drain cut valve (CDCV) is damaged or has failed
     
    Charcoal canister is full of fuel or moisture, or is damaged
     
    EVAP system drain passage is clogged
     
    Fuel tank pressure sensor is damaged or out-of-calibration
     
    Purge solenoid valve is damaged or has failed
     

    Trouble Code: P1451



    Canister Vent Solenoid Circuit Malfunction

    Possible Causes:



    CV solenoid control circuit is open or shorted to ground
     
    CV solenoid control circuit is shorted to system power (B+)
     
    CV solenoid is damaged or has failed
     
    PCM has failed
     

    Trouble Code: P1460



    Wide Open Throttle A/C Cut-Off Relay Circuit Malfunction

    Possible Causes:



    A/C relay is damaged or has failed
     
    A/C relay power circuit is open between relay and ENGINE fuse
     
    A/C relay control circuit is open between the relay and the PCM
     
    A/C relay control circuit is shorted to ground
     
    A/C relay control circuit is shorted to system power (B+)
     
    PCM has failed
     

    Trouble Code: P1461



    Wide Open Throttle A/C Cut-Off Relay Circuit Malfunction

    Possible Causes:



    A/C relay is damaged or has failed
     
    A/C relay power circuit is open between relay and ENGINE fuse
     
    A/C relay control circuit is open between the relay and the PCM
     
    A/C relay control circuit is shorted to ground
     
    A/C relay control circuit is shorted to system power (B+)
     
    PCM has failed
     

    Trouble Code: P1462



    Wide Open Throttle A/C Cut-Off Relay Circuit Malfunction

    Possible Causes:



    A/C relay is damaged or has failed
     
    A/C relay power circuit is open between relay and ENGINE fuse
     
    A/C relay control circuit is open between the relay and the PCM
     
    A/C relay control circuit is shorted to ground
     
    A/C relay control circuit is shorted to system power (B+)
     
    PCM has failed
     

    Trouble Code: P1463



    Wide Open Throttle A/C Cut-Off Relay Circuit Malfunction

    Possible Causes:



    A/C relay is damaged or has failed
     
    A/C relay power circuit is open between relay and ENGINE fuse
     
    A/C relay control circuit is open between the relay and the PCM
     
    A/C relay control circuit is shorted to ground
     
    A/C relay control circuit is shorted to system power (B+)
     
    PCM has failed
     

    Trouble Code: P1464



    A/C Control Signal Circuit Malfunction (Self-Test)

    Possible Causes:



    A/C relay control circuit is shorted to system power (B+)
     
    A/C relay is damaged or has failed
     
    A/C WOT relay is damaged or has failed
     
    A/C clutch is damaged or has failed
     
    PCM has failed
     

    Trouble Code: P1469



    A/C Clutch

    Possible Causes:



    A/C system has too much Freon
     
    A/C relay is damaged or has failed
     
    A/C system doesn-t have enough Freon
     
    A/C clutch is damaged or has failed
     
    PCM has failed
     

    Trouble Code: P1474



    Low Fan Relay Control Circuit Malfunction

    Possible Causes:



    LFC relay circuit is open or shorted to ground
     
    LFC relay circuit is shorted to system power (B+)
     
    LFC relay is shorted or damaged
     
    PCM has failed
     

    Trouble Code: P1477



    Medium Fan Relay Control Circuit Malfunction

    Possible Causes:



    MFC relay circuit is open or shorted to ground
     
    MFC relay circuit is shorted to system power (B+)
     
    MFC relay is damaged or has failed
     
    PCM has failed
     

    Trouble Code: P1479



    High Fan Control Relay Circuit Malfunction

    Possible Causes:



    HFC relay circuit is open or shorted to ground
     
    HFC relay circuit is shorted to system power (B+)
     
    HFC relay is shorted or damaged
     
    PCM has failed
     

    Trouble Code: P1500



    Vehicle Speed Sensor Intermittent Signal

    Possible Causes:



    VSS signal circuit is open (an intermittent fault)
     
    VSS signal circuit is shorted to ground (an intermittent fault)
     
    VSS signal circuit is shorted to VREF (an intermittent fault)
     
    VSS is damaged or has failed
     
    PCM has failed
     

    Trouble Code: P1501



    Vehicle Speed Sensor Circuit Malfunction (Self-Test)

    Possible Causes:



    Charging system problem (check alternator for AC leakage)
     
    Ignition system component has failed (i.e., check for signs of primary or secondary voltage leaking from the coil, coil wire, spark plug wires or boots, or the spark plug insulators
     
    PCM has failed
     

    Trouble Code: P1504



    Idle Air Control Solenoid Circuit Malfunction

    Possible Causes:



    IAC solenoid control circuit shorted to ground
     
    IAC solenoid is damaged or has failed
     
    PCM has failed
     

    Trouble Code: P1506



    Idle Air Control System RPM Higher Than Expected

    Possible Causes:



    EGR valve is stuck open or leaking, or the gasket is leaking
     
    EVAP purge valve is leaking or stuck in open position
     
    IAC solenoid control circuit is shorted to ground (intermittent)
     
    IAC valve is stuck open (it may be dirty or have failed)
     
    PCV valve is leaking, or a leak in the intake manifold exists
     
    PCM has failed
     

    Trouble Code: P1507



    Idle Air Control System RPM Lower Than Expected

    Possible Causes:



    Air filter element is severely restricted, or air inlet is plugged
     
    Base engine problems: cylinder compression or valve timing
     
    IAC valve is stuck in one position (it may be dirty or has failed)
     
    IAC solenoid or valve is damaged or has failed
     
    Throttle body is dirty, damaged or contaminated
     
    PCM has failed
     

    Trouble Code: P1512



    Intake Manifold Runner Control Shutter Valve (Stuck Closed)

    Possible Causes:



    IMRC control circuit shorted to ground or to system power (B+)
     
    IMRC shutter valve actuator is stuck closed
     
    IMRC vacuum hose is loose or disconnected
     
    PCM has failed
     

    Trouble Code: P1516



    Neutral Switch Circuit Malfunction

    Possible Causes:



    Neutral switch signal circuit is open or shorted to ground
     
    Neutral switch power circuit is open or shorted to ground
     
    Neutral switch is damaged or has failed
     
    PCM has failed
     

    Trouble Code: P1518



    Intake Manifold Runner Control Shutter Valve (Stuck Open)

    Possible Causes:



    IMRC control circuit shorted to ground or to system power (B+)
     
    IMRC shutter valve actuator is stuck closed
     
    IMRC vacuum hose is loose or disconnected
     
    PCM has failed
     

    Trouble Code: P1519



    Intake Manifold Runner Control Shutter Valve (Stuck Open)

    Possible Causes:



    IMRC control circuit shorted to ground or to system power (B+)
     
    IMRC shutter valve actuator is stuck closed
     
    IMRC vacuum hose is loose or disconnected
     
    PCM has failed
     

    Trouble Code: P1537



    Bypass Air Solenoid Circuit Malfunction

    Possible Causes:



    Bypass air solenoid control circuit is open or shorted to ground
     
    Bypass air solenoid power circuit is open
     
    Bypass air solenoid is damaged or has failed
     
    PCM has failed
     

    Trouble Code: P1549



    Air Bypass Valve System

    Possible Causes:



    Engine control sensor is out-of-range (i.e., ECT, IAT or MAF)
     
    ABV vacuum or vent solenoid is damaged or has failed
     
    Air intake leak in the engine or related vacuum hose or pipes
     
    Air intake restriction in a component related to the ABV system
     
    PCM has failed
     

    Trouble Code: P1550



    Air Bypass Valve System

    Possible Causes:



    Engine control sensor is out-of-range (i.e., ECT, IAT or MAF)
     
    ABV vacuum or vent solenoid is damaged or has failed
     
    Air intake leak in the engine or related vacuum hose or pipes
     
    Air intake restriction in a component related to the ABV system
     
    PCM has failed
     

    Trouble Code: P1565



    PCM +BB Voltage Low

    Possible Causes:



    +BB circuit is open
     
    +BB circuit is shorted to ground (check for a blown fuse)
     
    +BB circuit has high resistance (check the battery connections)
     
    PCM has failed
     

    Trouble Code: P1566



    TCM +BB Voltage Low

    Possible Causes:



    +BB circuit is open
     
    +BB circuit is shorted to ground (check for a blown fuse)
     
    +BB circuit has high resistance (check the battery connections)
     
    TCM has failed
     

    Trouble Code: P1567



    TCM +BB Voltage Low

    Possible Causes:



    +BB circuit is open
     
    +BB circuit is shorted to ground (check for a blown fuse)
     
    +BB circuit has high resistance (check the battery connections)
     
    TCM has failed
     

    Trouble Code: P1568



    TCM +BB Voltage Low

    Possible Causes:



    +BB circuit is open
     
    +BB circuit is shorted to ground (check for a blown fuse)
     
    +BB circuit has high resistance (check the battery connections)
     
    TCM has failed
     

    Trouble Code: P1572



    Variable Timing Control System Circuit High Input

    Possible Causes:



    VTCS control circuit is shorted to system power (B+)
     
    VTCS solenoid valve is damaged or has failed
     
    PCM is damaged
     

    Trouble Code: P1624



    Immobilizer Communication Error

    Possible Causes:



    Perform a PCM "reset" procedure
     
    Attempt to start the engine three (3) times
     
    If the code resets, check for other codes related to a No Start
     
    Perform engine diagnostics to determine the cause of No Start
     

    Trouble Code: P1633



    PCM Long Term Memory Interruption

    Possible Causes:



    KAM circuit is open between battery and the PCM connector
     
    KAM circuit is shorted to ground (check for a blown fuse)
     
    KAM circuit has high resistance at the battery connections
     
    PCM has failed
     

    Trouble Code: P1635



    Generator Battery Terminal Open Circuit Malfunction

    Possible Causes:



    Generator Battery Terminal circuit is open
     
    Generator is damaged or has failed (i.e., no Generator output)
     
    Battery has failed (it is unable to accept a charge)
     
    PCM has failed
     

    Trouble Code: P1636



    Generator Battery Terminal Open Circuit Malfunction

    Possible Causes:



    Generator Battery Terminal circuit is open
     
    Generator is damaged or has failed (i.e., no Generator output)
     
    Battery has failed (it is unable to accept a charge)
     
    PCM has failed
     

    Trouble Code: P1639



    Generator Battery Terminal Open Circuit Malfunction

    Possible Causes:



    Generator Battery Terminal circuit is open
     
    Generator is damaged or has failed (i.e., no Generator output)
     
    Battery has failed (it is unable to accept a charge)
     
    PCM has failed
     

    Trouble Code: P1641



    Generator Battery Terminal Open Circuit Malfunction

    Possible Causes:



    Generator Battery Terminal circuit is open
     
    Generator is damaged or has failed (i.e., no Generator output)
     
    Battery has failed (it is unable to accept a charge)
     
    PCM has failed
     

    Trouble Code: P1650



    Power Steering Pressure Switch Circuit Malfunction (Self-Test)

    Possible Causes:



    PSP signal circuit is open or shorted to ground
     
    PSPS ground circuit is open (at the switch mounting point)
     
    PSPS is damaged or has failed
     
    PCM has failed
     

     
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