Mazda Car 2002-04

2.5L V6 - Auto 2

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Trouble Code: P0174



Adaptive Fuel Trim Too Lean (Bank 1)

Possible Causes:



Air leaks after the MAF sensor, or in the PCV or EGR system
 
Base engine -mechanical- fault affecting one or more cylinders
 
Exhaust leaks before or near where the front HO2S is mounted
 
Fuel control sensor out of calibration (i.e., ECT, IAT or MAF)
 
Fuel delivery system supplying too little fuel at idle or cruise
 
Fuel Injectors (one or more) is dirty, restricted or leaking fuel
 
HO2S is contaminated, deteriorated or it has failed
 
Vehicle driven low on fuel or driven until it ran out of fuel
 

Trouble Code: P0175



Adaptive Fuel Trim Too Rich (Bank 2)

Possible Causes:



One or more injectors leaking or pressure regulator is leaking
 
Fuel delivery system supplying too much fuel during cruise or idle periods (e.g., faulty fuel pump, or faulty pressure regulator)
 
Exhaust leaks before or near where the front HO2S is mounted
 
HO2S is contaminated, deteriorated or it has failed
 
EVAP system component has failed or canister fuel saturated
 
Fuel control sensor is out of calibration (i.e., ECT, IAT or MAP)
 
Base engine -mechanical- fault affecting one or more cylinders
 

Trouble Code: P0171



Adaptive Fuel Trim Too Lean (Bank 1)

Possible Causes:



Air leaks after the MAF sensor, or air leaks in the PCV system
 
Air leaks at the EGR gasket, or at the EGR valve diaphragm
 
Base engine -mechanical- fault affecting one or more cylinders
 
Fuel control sensor out of calibration (i.e., ECT, IAT or MAF)
 
Fuel delivery system supplying too little fuel during cruise or idle speed (weak fuel pump, dirty/leaking fuel injector)
 
Exhaust leaks before or near where the front HO2S is mounted
 
HO2S is contaminated, deteriorated or it has failed
 
Vehicle driven low on fuel or driven until it ran out of fuel
 

Trouble Code: P0172



Adaptive Fuel Trim Too Rich (Bank 1)

Possible Causes:



Base engine -mechanical- fault affecting one or more cylinders
 
EVAP system component has failed or canister fuel saturated
 
Exhaust leaks before or near where the front HO2S is mounted
 
Fuel control sensor out of calibration (i.e., IAT, MAP or MAF)
 
Fuel injectors (one or more) sticking or leaking fuel
 
Fuel delivery system supplying too much fuel during cruise or idle periods (e.g., faulty fuel pump, or faulty pressure regulator)
 
HO2S is contaminated, deteriorated or it has failed
 

Trouble Code: P0174



Adaptive Fuel Trim Too Lean (Bank 2)

Possible Causes:



Air leaks after the MAF sensor, or air leaks in the PCV system
 
Air leaks at the EGR gasket, or at the EGR valve diaphragm
 
Base engine -mechanical- fault affecting one or more cylinders
 
Fuel delivery system supplying too little fuel during cruise or idle speed (weak fuel pump, dirty/leaking fuel injector)
 
Exhaust leaks before or near where the front HO2S is mounted
 
HO2S is contaminated, deteriorated or it has failed
 
Vehicle driven low on fuel or driven until it ran out of fuel
 

Trouble Code: P0230



Fuel Pump Primary Circuit Malfunction

Possible Causes:



Fuel pump primary circuit is open or shorted to ground
 
Fuel pump primary circuit is shorted to system power (VREF)
 
Fuel pump relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P0300



Random 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: 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: 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



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
 
Purge solenoid valve is damaged or has failed
 
Charcoal canister is loaded with fuel or moisture
 
Tank pressure control valve (TPCV) is damaged or has failed
 
Canister drain cut valve (CDCV) is damaged or has failed
 
Rollover valve or catch tank valve is damaged or leaking
 
Fuel tank is cracked (leaking), or a leak exists in the tank seal
 
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: P0450



EVAP Pressure Sensor Circuit Malfunction

Possible Causes:



FTP sensor signal circuit is open (4.80v reading)
 
FTP sensor signal circuit is shorted to ground (0.20v reading)
 
FTP sensor power circuit is open between sensor and the PCM
 
FTP sensor ground circuit is open between sensor and ground
 
FTP sensor signal circuit is shorted to VREF or system power
 
FTP sensor is damaged or has failed
 
PCM has failed
 

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
 
Purge solenoid valve is damaged or has failed
 
Connection problems at the CDCV FTP sensor or at the PCM
 
CDCV (valve) or FTP sensor open or shorted in wiring harness
 
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: P0464



Fuel Tank Level 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 1 Control Circuit Malfunction

Possible Causes:



Condenser fan relay 1 control circuit open or shorted to ground
 
Condenser fan relay 1 control power circuit is open
 
Condenser fan relay 1 is damaged or has failed
 
PCM has failed
 

Trouble Code: P0481



Cooling Fan Relay 1 and Condenser Fan Relay 1 Control Circuit Malfunction

Possible Causes:



Cooling or condenser fan relay 1 circuit open, shorted to ground
 
Cooling or condenser fan relay 1 control power circuit is open
 
Cooling or condenser fan relay 1 is damaged or has failed
 
PCM has failed
 

Trouble Code: P0482



Cooling Fan Relay and Condenser Fan Relay 2 Control Circuit Malfunction

Possible Causes:



Cooling or condenser fan relay 2 circuit open, shorted to ground
 
Cooling or condenser fan relay 2 control power circuit is open
 
Cooling or condenser fan relay 1 is damaged or has failed
 
PCM has failed
 

Trouble Code: P0500



Vehicle Speed Sensor Circuit Malfunction

Possible Causes:



VSS positive (+) signal circuit is open or shorted to ground
 
VSS negative (-) signal 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
 

 
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