Mazda Car 2002-04

2.5L V6 - Std 2

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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: 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: 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: 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
 

Trouble Code: P0704



Clutch Pedal Switch Circuit Malfunction

Possible Causes:



Clutch switch signal circuit is open or shorted ground
 
Clutch switch power circuit (B+) open between switch and PCM
 
Clutch switch is damaged, misadjusted or installed improperly
 
PCM has failed
 

Trouble Code: P1001



Data Link Connector Circuit Malfunction

Possible Causes:



DLC connector or the related terminals/pins are damaged
 
DLC Bus (+) circuit is open or shorted to ground
 
DLC Bus (+) circuit is shorted at an associated module
 
DLC ground circuit is open or has a high resistance condition
 
PCM power relay is damaged or has failed (no power to DLC)
 
Incorrect Self-Test procedure followed, or idle speed to low
 
PCM has failed (e.g., the PCM VREF may be out-of-range)
 

Trouble Code: P1100



Mass Airflow Sensor Circuit Malfunction (Intermittent)

Possible Causes:



MAF sensor continuity problems at the connector or harness
 
MAF sensor circuit is open (the fault may be intermittent)
 
MAF sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1101



Mass Airflow Sensor Malfunction (Self-Test)

Possible Causes:



MAF sensor is damaged, dirty or has failed
 
MAF sensor (inlet) screen is dirty or blocked
 
An intake air leak is present near the MAF sensor location
 
PCM has failed
 

Trouble Code: P1112



Intake Air Temperature Sensor Signal Circuit Malfunction

Possible Causes:



IAT sensor signal circuit is open (intermittent fault)
 
IAT sensor signal circuit is shorted to ground (intermittent fault)
 
IAT sensor ground circuit is open (intermittent fault)
 
IAT sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1116



Engine Coolant Temperature Sensor Circuit Malfunction (Self-Test)

Possible Causes:



ECT sensor signal circuit open or shorted to ground
 
ECT sensor signal shorted to VREF or system power
 
ECT sensor
 

Trouble Code: P1117



Engine Coolant Temperature Sensor Circuit Malfunction

Possible Causes:



ECT sensor signal is open (fault may be intermittent)
 
ECT sensor signal shorted to ground (fault may be intermittent)
 
ECT sensor signal shorted to VREF (fault may be intermittent)
 
ECT sensor ground circuit is open (fault may be intermittent)
 
ECT sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1120



TP Sensor Signal Out of Range Low

Possible Causes:



TP sensor contacts are loose, broken or damaged
 
TP sensor pins are loose in the connector
 
TP sensor signal circuit shorted to ground (an intermittent fault)
 
TP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P11121



Throttle Position Signal Not Consistent With MAF Signal

Possible Causes:



MAF sensor is damaged or has failed
 
TP sensor is damaged or has failed
 
Air leaks between the MAF sensor and the throttle body
 
PCM has failed
 

Trouble Code: P1124



Throttle Position Sensor Signal Out Of Range (Self-Test)

Possible Causes:



Throttle linkage is bent or binding
 
TP sensor is not seated properly
 
Throttle plate below closed throttle position, or throttle plate screw misadjusted
 
TP sensor is damaged
 
PCM has failed
 

Trouble Code: P1125



Throttle Position Sensor Signal Circuit Malfunction

Possible Causes:



TP sensor wiring harness is open (an intermittent fault)
 
TP sensor connector or pins are open (an intermittent fault)
 
TP sensor signal circuit is open (an intermittent fault)
 
TP sensor signal circuit is grounded (an intermittent fault)
 

Trouble Code: P1127



HO2S-12 Heater Not Enabled (Self-Test)

Possible Causes:



Engine not operated long enough prior to beginning the KOER Self-Test
 
Exhaust system temperature is too cold to run the test
 

Trouble Code: P1130



HO2S-11 (Bank 1 Sensor 1) Fuel Control Limit Reached

Possible Causes:



HO2S is damaged or has failed
 
HO2S circuits wet or oily, corroded, or poor terminal contact
 
HO2S signal circuit open, shorted to ground, short to power
 
Low fuel pressure or vehicle driven until it was out of fuel
 
Fuel pressure regulator leaking, or fuel injectors leaking
 
EVAP vapor recovery system has failed
 
Air leaks located after the MAF sensor
 
Exhaust leaks before or near the front HO2S
 
EGR valve stuck, EGR diaphragm leaking, or gasket leaking
 
Oil dipstick not seated or engine oil level too high (overfilled)
 

Trouble Code: P11131



HO2S-11 (Bank 1 Sensor 1) Indicates A/F Ratio Too Lean

Possible Causes:



Air leaks located after the MAF sensor
 
Base Engine: Check for vacuum leaks with a Smoke Tester
 
Intake air system is leaking, obstructed and damaged
 
Low fuel pressure or vehicle driven until it was out of fuel
 
PCV system has air leaks at the valve or related hoses
 

Trouble Code: P1132



HO2S-11 (Bank 1 Sensor 1) Indicates A/F Ratio Too Rich

Possible Causes:



Check air cleaner element, air cleaner housing for blockage
 
Fuel pressure regulator is leaking, or fuel pressure is too high
 
Fuel injectors leaking or contaminated (they may be sticking)
 
EVAP vapor recovery system has failed (canister full of fuel)
 

Trouble Code: P1137



HO2S-12 Lack of Switching, Indicates Lean (Self-Test)

Possible Causes:



Air leaks located after the MAF sensor
 
Base Engine: Check for vacuum leaks with a Smoke Tester
 
HO2S wiring may be crossed at the connector
 
Check intake air system for leaks, obstructions and damage
 
EGR system malfunction (the EGR valve may be stuck open)
 
PCV system has air leaks at the valve or related hoses
 
Fuel pressure is too low (fuel filter is dirty, or weak fuel pump)
 
Vehicle driven until it was out of fuel
 

Trouble Code: P1138



HO2S-12 Lack of Switching, Indicates Rich (Self-Test)

Possible Causes:



Check air cleaner element, air cleaner housing for blockage
 
Fuel pressure regulator is leaking, or fuel pressure is too high
 
HO2S wiring may be crossed at the connector
 
Fuel injectors leaking or contaminated (they may be sticking)
 
EVAP vapor recovery system has failed (canister full of fuel)
 

Trouble Code: P1143



HO2S-22 Input Indicates A/F Ratio Too Lean (Self-Test)

Possible Causes:



Air leaks located after the MAF sensor
 
Base Engine: Check for vacuum leaks with a Smoke Tester
 
HO2S wiring may be crossed at the connector
 
Check intake air system for leaks, obstructions and damage
 
PCV system has air leaks at the valve or related hoses
 
Fuel pressure is too low (fuel filter is dirty, or weak fuel pump)
 
Vehicle driven until it was out of fuel
 

Trouble Code: P1144



HO2S-22 (Bank 2 Sensor 2) Indicates A/F Ratio Too Rich (Self-Test)

Possible Causes:



Check air cleaner element, air cleaner housing for blockage
 
HO2S wiring may be crossed at the connector
 
Fuel pressure regulator is leaking, or fuel pressure is too high
 
Fuel injectors leaking or contaminated (they may be sticking)
 
EVAP vapor recovery system has failed (canister full of fuel)
 

Trouble Code: P1150



HO2S-21 (Bank 2 Sensor 1) Fuel Control Limit Reached

Possible Causes:



HO2S is damaged or has failed
 
HO2S circuits wet or oily, corroded, or poor terminal contact
 
HO2S signal circuit open, shorted to ground, short to power
 
Low fuel pressure or vehicle driven until it was out of fuel
 
Excessive fuel pressure, leaking or contaminated fuel injectors
 
Leaking fuel pressure regulator
 
EVAP vapor recovery system has failed
 
Air leaks located after the MAF sensor
 
Exhaust leaks before or near the front HO2S
 
EGR valve stuck, EGR diaphragm leaking, or gasket leaking
 
Oil dipstick not seated or engine oil level too high (overfilled)
 

Trouble Code: P1151



HO2S-21 (Bank 1 Sensor 1) Indicates A/F Ratio Too Lean

Possible Causes:



Air leaks located after the MAF sensor
 
Base Engine: Check for vacuum leaks with a Smoke Tester
 
Intake air system is leaking, obstructed and damaged
 
Low fuel pressure or vehicle driven until it was out of fuel
 
PCV system has air leaks at the valve or related hoses
 

Trouble Code: P1152



HO2S-21 (Bank 2 Sensor 1) Indicates A/F Ratio Too Rich

Possible Causes:



Check air cleaner element, air cleaner housing for blockage
 
Fuel pressure regulator is leaking, or fuel pressure is too high
 
Fuel injectors leaking or contaminated (they may be sticking)
 
EVAP vapor recovery system has failed (canister full of fuel)
 

Trouble Code: P1157



HO2S-22 Lack of Switching, Indicates Lean (Self-Test)

Possible Causes:



An air leak that is located after the MAF sensor
 
Base Engine: Check for vacuum leaks with a Smoke Tester
 
HO2S wiring may be crossed at the connector
 
Check intake air system for leaks, obstructions and damage
 
EGR system malfunction (the EGR valve may be stuck open)
 
PCV system has air leaks at the valve or related hoses
 
Fuel pressure is too low (fuel filter is dirty, or weak fuel pump)
 
Vehicle driven until it was out of fuel
 

 
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