Mazda Car 2002-04

2.0L L4 - Std 2

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Trouble Code: P0301



Cylinder 1 Misfire Detected

Possible Causes:



Base engine mechanical fault affecting only Cylinder 1
 
CKP sensor is damaged or failed (problem may be intermittent)
 
Fuel metering fault that affects only Cylinder 1
 
Ignition system fault that affects only Cylinder 1
 

Trouble Code: P0302



Cylinder 2 Misfire Detected

Possible Causes:



Base engine mechanical fault affecting only Cylinder 2
 
CKP sensor is damaged or failed (problem may be intermittent)
 
Fuel metering fault that affects only Cylinder 2
 
Ignition system fault that affects only Cylinder 2
 

Trouble Code: P0303



Cylinder 3 Misfire Detected

Possible Causes:



Base engine mechanical fault affecting only Cylinder 3
 
CKP sensor is damaged or failed (problem may be intermittent)
 
Fuel metering fault that affects only Cylinder 3
 
Ignition system fault that affects only Cylinder 3
 

Trouble Code: P0304



Cylinder 4 Misfire Detected

Possible Causes:



Base engine mechanical fault affecting only Cylinder 4
 
CKP sensor is damaged or failed (problem may be intermittent)
 
Fuel metering fault that affects only Cylinder 4
 
Ignition system fault that affects only Cylinder 4
 

Trouble Code: P0305



Cylinder 5 Misfire Detected

Possible Causes:



Base engine mechanical fault affecting only Cylinder 5
 
CKP sensor is damaged or failed (problem may be intermittent)
 
Fuel metering fault that affects only Cylinder 5
 
Ignition system fault that affects only Cylinder 5
 

Trouble Code: P0306



Cylinder 6 Misfire Detected

Possible Causes:



Base engine mechanical fault affecting only Cylinder 6
 
CKP sensor is damaged or failed (problem may be intermittent)
 
Fuel metering fault that affects only Cylinder 6
 
Ignition system fault that affects only Cylinder 6
 

Trouble Code: P0300



Multiple Misfire Detected

Possible Causes:



Base engine mechanical fault affecting one or more cylinders
 
CMP sensor is damaged or failed (problem may be intermittent)
 
Fuel metering fault that affects more than one cylinder
 
Fuel pressure too low or too high, fuel supply contaminated
 
EVAP system problem or the EVAP canister is fuel saturated
 
EGR valve is stuck open or the PCV system has a vacuum leak
 
Ignition system fault that affects more than one cylinder
 
MAF sensor is contaminated (this can cause a lean condition)
 

Trouble Code: P0320



Ignition Engine Speed (PIP) Signal Error

Possible Causes:



Engine speed or PIP signal circuit is open (an intermittent fault)
 
Engine speed signal circuit shorted to ground (intermittent)
 
Ignition system components arcing (ignition coils or wires)
 
Vehicle onboard transmitter interruption (i.e., 2-way radio)
 

Trouble Code: P0325



Knock Sensor Circuit Malfunction

Possible Causes:



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

Trouble Code: P0335



Crankshaft Position (NE) Sensor Circuit Malfunction

Possible Causes:



CKP sensor signal is open or shorted to ground
 
CKP sensor signal is shorted to VREF or system power (B+)
 
CKP sensor is damaged or has failed
 
Trigger wheel or tone wheel is damaged
 
PCM has failed
 

Trouble Code: P0340



Camshaft Position Sensor Circuit Malfunction

Possible Causes:



CMP sensor signal is open or shorted to ground
 
CMP sensor signal is shorted to VREF or system power (B+)
 
CMP sensor is damaged or has failed
 
CMP sensor shielding may be open or damaged
 
PCM has failed
 

Trouble Code: P0400



EGR System Flow Malfunction

Possible Causes:



EGR boost solenoid control circuit is open or shorted to ground
 
EGR boost solenoid power circuit is open to the Main Relay
 
EGR boost solenoid is damaged or has failed
 
EGR boost sensor is damaged or has failed
 
EGR valve assembly is leaking, damaged or has failed
 
EGR valve vacuum hose(s) lose, damaged or disconnected
 
MAF sensor or TP sensor has drifted out-of-calibration
 
Exhaust pipe to EGR boost sensor or solenoid leaking/plugged
 
PCM has failed
 

Trouble Code: P0401



EGR System Insufficient Flow Detected

Possible Causes:



EGR boost solenoid control circuit is open or shorted to ground
 
EGR boost solenoid power circuit is open to the Main Relay
 
EGR boost solenoid is damaged or has failed
 
EGR boost sensor is damaged or has failed
 
EGR valve position sensor is damaged, stuck or has failed
 
EGR valve assembly is leaking, damaged or has failed
 
EGR valve vacuum hose(s) lose, damaged or disconnected
 
IAT, MAF, TP and VSS (sensor) has drifted out-of-range
 
PCM has failed
 

Trouble Code: P0402



EGR System Excessive Flow At Idle Speed Detected

Possible Causes:



EGR boost solenoid control circuit is open or shorted to ground
 
EGR boost solenoid power circuit is open to the Main Relay
 
EGR boost solenoid is damaged or has failed
 
EGR boost sensor is damaged or has failed
 
EGR valve position sensor is damaged, stuck or has failed
 
EGR valve assembly is leaking, damaged or has failed
 
EGR valve vacuum hose(s) lose, damaged or disconnected
 
IAT, MAF, TP and VSS (sensor) has drifted out-of-range
 
PCM has failed
 

Trouble Code: P0404



EGR Valve Position Sensor Circuit Range/Performance

Possible Causes:



EGR boost solenoid control circuit is open or shorted to ground
 
EGR boost solenoid power circuit is open to the Main Relay
 
EGR boost solenoid is damaged or has failed
 
EGR boost sensor is damaged or has failed
 
EGR valve position sensor is damaged, stuck or has failed
 
EGR valve assembly is leaking, damaged or has failed
 
EGR valve vacuum hose(s) lose, damaged or disconnected
 
Exhaust pipe to EGR boost sensor or solenoid leaking/plugged
 
PCM has failed
 

Trouble Code: P0420



Catalyst Efficiency Below Normal (Bank 1)

Possible Causes:



Air leaks at the exhaust manifold or in the exhaust pipes
 
Catalytic converter is contaminated, damaged or has failed
 
Front HO2S and/or the rear HO2S is loose in the mounting hole
 
Front HO2S older (aged) than the rear HO2S (HO2S is lazy)
 
Front HO2S or rear HO2S is contaminated with fuel or moisture
 

Trouble Code: P0430



Catalyst Efficiency Below Normal (Bank 2)

Possible Causes:



Air leaks at the exhaust manifold or in the exhaust pipes
 
Catalytic converter is contaminated, damaged or has failed
 
Front HO2S and/or the rear HO2S is loose in the mounting hole
 
Front HO2S older (aged) than the rear HO2S (HO2S is lazy)
 
Front HO2S or rear HO2S is contaminated with fuel or moisture
 

Trouble Code: P0421



Warm-up Catalyst Efficiency Below Normal (Bank 1)

Possible Causes:



Air leaks at the exhaust manifold or in the exhaust pipes
 
Catalytic converter is contaminated, damaged or has failed
 
Front HO2S and/or the rear HO2S is loose in the mounting hole
 
Front HO2S older (aged) than the rear HO2S (HO2S is lazy)
 
Front HO2S or rear HO2S is contaminated with fuel or moisture
 

Trouble Code: P0431



Warm-up Catalyst Efficiency Below Normal (Bank 2)

Possible Causes:



Air leaks at the exhaust manifold or in the exhaust pipes
 
Catalytic converter is contaminated, damaged or has failed
 
Front HO2S and/or the rear HO2S is loose in the mounting hole
 
Front HO2S older (aged) than the rear HO2S (HO2S is lazy)
 
Front HO2S or rear HO2S is contaminated with fuel or moisture
 

Trouble Code: P0442



EVAP System Small Leak (0.040-) Detected

Possible Causes:



Fuel filler cap loose, cross-threaded, incorrect part or damaged
 
EVAP purge solenoid is damaged or has failed
 
EVAP charcoal canister is loaded with fuel or moisture
 
EVAP canister drain cut valve is damaged or has failed
 
EVAP rollover valve or catch tank valve is damaged or leaking
 
EGR boost sensor is damaged or has failed
 
Fuel level sensor is damaged or has failed
 
Fuel tank pressure sensor is damaged or has failed
 
ECT, IAT, MAF, VSS or TP sensor signals out-of-calibration
 
Vapor line(s) damaged or leaking between the purge solenoid and the intake manifold, EVAP purge solenoid valve and the canister, canister drain cut valve and the rollover valve
 
PCM has failed
 

Trouble Code: P0443



EVAP Canister Purge Solenoid Circuit Malfunction

Possible Causes:



Purge solenoid control circuit is open or shorted to ground
 
Purge solenoid control circuit is shorted to system power (B+)
 
Purge solenoid power circuit is open or shorted to ground
 
Purge solenoid is damaged or has failed
 
PCM has failed (the purge solenoid driver may be damaged)
 

Trouble Code: P0446



EVAP System Vent Control Malfunction

Possible Causes:



CDCV is damaged, sticking or has failed
 
Canister Vent side filter is damaged or missing
 
Charcoal canister is loaded with fuel or moisture
 
FTP sensor signal circuit is open, shorted to ground or to power
 
FTP sensor power circuit is open or shorted to ground
 
FTP sensor is damaged or has failed
 
BARO, ECT, IAT, MAF, VSS or TP sensor is out-of-calibration
 
Fuel tank level sensor is damaged or out-of-calibration
 
Fuel vapor storage canister vent is plugged or restricted
 
Fuel vapor line(s) kinked or blocked between the CDVC solenoid and the intake manifold
 

Trouble Code: P0451



EVAP Pressure Sensor Circuit Range/Performance

Possible Causes:



Air filter element or charcoal canister is very dirty or clogged
 
CDCV (valve) is damaged or has failed
 
Pressure control valve is damaged or has failed
 
Connection problems at the CDCV FTP sensor or at the PCM
 
CDCV (valve) or FTP sensor wiring harness is open or shorted
 
PCM has failed
 

Trouble Code: P0452



EVAP Pressure Sensor Circuit Low Input

Possible Causes:



FTP sensor is completely submerged in fuel inside the fuel tank
 
FTP sensor signal circuit is shorted to sensor ground
 
FTP sensor signal circuit is shorted to chassis ground
 
FTP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0453



EVAP Pressure Sensor Circuit High Input

Possible Causes:



FTP sensor signal circuit is shorted to VREF or power (B+)
 
FTP sensor ground circuit is open
 
FTP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0455



EVAP System Large Leak (0.080-) Detected

Possible Causes:



Fuel filler cap loose, cross-threaded, incorrect part or damaged
 
Charcoal canister is loaded with fuel or moisture, or has failed
 
Canister drain cut valve (CDCV) is damaged or leaking
 
Fuel tank pressure (FTP) sensor is damaged or has failed
 
Fuel level sensor is damaged or out-of-calibration
 
Purge solenoid valve is damaged or has failed
 
Vent cut valve is damaged, is leaking or has failed
 
IAT, ECT, MAF, MAP, VSS or TP sensor is out-of-calibration
 
Catch tank or rollover valve is damaged, or fuel tank is leaking
 
Vapor line(s) damaged or leaking between the purge solenoid and intake manifold, purge solenoid and canister, or between the CDCV and vent cut valve, check valve and rollover valve
 
PCM has failed
 

Trouble Code: P0460



Fuel Level Indicator Signal Circuit Malfunction

Possible Causes:



FLI signal circuit is open, shorted to ground or to power (B+)
 
Fuel tank empty or overfull (FP module is stuck mechanically)
 
Wrong fuel gauge is installed, or instrument panel is damaged
 
Fuel gauge sender unit is damaged or has failed
 
PCM has failed
 

Trouble Code: P0461



Fuel Level Indicator Signal Circuit Range/Performance

Possible Causes:



FLI signal circuit is open, shorted to ground or to power (B+)
 
Fuel tank empty or overfull (FP module is stuck mechanically)
 
Wrong fuel gauge is installed, or instrument panel is damaged
 
Fuel gauge sender unit is damaged or has failed
 
PCM has failed
 
TSB 0101000 (6/01) contains information related to this code
 

Trouble Code: P0462



Fuel Level Sensor Circuit Low Input

Possible Causes:



Fuel gauge sending unit signal is shorted to sensor ground
 
Fuel gauge sending unit signal is shorted to chassis ground
 
Fuel gauge sending unit is damaged or has failed
 
PCM has failed
 

Trouble Code: P0463



Fuel Level Sensor Circuit High Input

Possible Causes:



Fuel gauge sending unit signal shorted to VREF or power
 
Fuel gauge sending unit ground circuit is open
 
Fuel gauge sender signal is damaged or has failed
 
PCM has failed
 

Trouble Code: P0464



Fuel Level Indicator Sensor Circuit Malfunction

Possible Causes:



Fuel gauge sending unit is damaged or has failed
 
Fuel gauge sending unit signal is open or shorted to ground
 
PCM has failed
 

Trouble Code: P0480



Condenser Fan Relay Control Circuit Malfunction

Possible Causes:



Condenser fan relay control circuit open or shorted to ground
 
Condenser fan relay control power circuit is open
 
Condenser fan relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P0500



Vehicle Speed Sensor Circuit Malfunction

Possible Causes:



VSS signal circuit is open, shorted to ground or to power
 
VSS power circuit is open or shorted to ground
 
VSS is damaged or has failed
 
PCM has failed
 

Trouble Code: P0503



Vehicle Speed Sensor Circuit Malfunction (Self-Test)

Possible Causes:



VSS positive (+) signal is open or shorted to ground
 
VSS negative (-) signal is open or shorted to ground
 
VSS is damaged or has failed
 
Instrument cluster has failed (VSS signal goes to the cluster)
 
PCM has failed
 

Trouble Code: P0505



Idle Speed Control System Malfunction

Possible Causes:



IAC valve power circuit is open between main relay and valve
 
High resistance between PCM and IAC valve control circuits
 
IAC valve circuits open, shorted to ground or shorted to power
 
PCM has failed (the IAC valve driver circuit may have failed)
 

Trouble Code: P0506



Idle Control System RPM Lower Than Expected

Possible Causes:



Air intake system leaks (in the intake manifold or PCV valve)
 
IAC valve power circuit is open between main relay and valve
 
High resistance between PCM and IAC valve control circuits
 
IAC valve circuits open, shorted to ground or shorted to power
 
IAC valve air inlet is plugged, dirty or restricted
 
IAC valve is damaged or has failed
 
Throttle body is damaged or dirty (it may need to be cleaned)
 

Trouble Code: P0507



Idle Control System RPM Higher Than Expected

Possible Causes:



Air intake system leaks (in the intake manifold or PCV valve)
 
IAC valve power circuit is open between main relay and valve
 
High resistance between PCM and IAC valve control circuits
 
IAC valve circuits open, shorted to ground or shorted to power
 
IAC valve air inlet is plugged, dirty or restricted
 
IAC valve is damaged or has failed
 
Throttle body is damaged or dirty (it may need to be cleaned)
 

Trouble Code: P0550



Power Steering Pressure Switch Circuit Malfunction

Possible Causes:



Power steering switch signal circuit shorted to sensor ground
 
Power steering switch signal circuit shorted to chassis ground
 
Power steering switch is damaged or has failed
 
Engine Speed System (power steering function) is damaged
 
PCM has failed
 

Trouble Code: P0603



PCM Keep Alive Memory Test Error

Possible Causes:



KAM circuit is open (it may be an intermittent problem)
 
KAM circuit is shorted to ground
 
Battery terminals have high resistance due to corrosion or dirt
 
PCM has failed
 

Trouble Code: P0605



PCM Read Only Memory Test Error

Possible Causes:



PCM has failed (an internal fault)
 
PCM must be replaced when this code is set
 

 
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