Mazda Car 2002-04

1.8L L4 - Std 1

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1.8L L4 - Std

Trouble Code: P0100



MAF or VAF Sensor Circuit Malfunction

Possible Causes:



MAF sensor signal circuit is open or shorted to ground
 
MAF sensor power circuit is open or the ground circuit is open
 
MAF sensor is damaged or has failed
 
PCM has failed
 
TSB SSP056 (2/02) contains a MAF sensor warranty (Protege)
 

Trouble Code: P0102



MAF Sensor Circuit Low Input

Possible Causes:



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

Trouble Code: P0103



MAF Sensor Circuit High Input

Possible Causes:



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

Trouble Code: P0106



BARO Sensor Circuit Performance

Possible Causes:



BARO sensor signal circuit is open or shorted to ground
 
BARO sensor signal is shorted to VREF or system power
 
BARO sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0107



BARO Sensor Circuit Low Input

Possible Causes:



EGR Boost sensor signal circuit is shorted to ground
 
EGR boost sensor VREF circuit is open or shorted to ground
 
EGR Boost sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0108



BARO Sensor Circuit High Input

Possible Causes:



EGR boost sensor signal circuit open from sensor to the PCM
 
EGR boost sensor ground circuit open from sensor to the PCM
 
EGR Boost sensor signal circuit is shorted to VREF or power
 
EGR Boost sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0111



Intake Air Temperature Sensor Circuit Range/Performance

Possible Causes:



IAT sensor signal circuit has high resistance
 
IAT sensor has drifted out of calibration
 
IAT sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0112



Intake Air Temperature Sensor Circuit Low Input

Possible Causes:



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

Trouble Code: P0113



Intake Air Temperature Sensor Circuit High Input

Possible Causes:



IAT sensor signal circuit is open
 
IAT sensor signal circuit is shorted to VREF or system power
 
IAT sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0117



Engine Coolant Temperature Sensor Circuit Low Input

Possible Causes:



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

Trouble Code: P0118



Engine Coolant Temperature Sensor Circuit High Input

Possible Causes:



ECT sensor signal circuit is open
 
ECT sensor signal circuit is shorted to VREF or system power
 
ECT sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0122



TP Sensor Circuit Low Input

Possible Causes:



TP sensor signal circuit is shorted to ground
 
TP sensor VREF circuit is open or shorted to ground
 
Throttle body is damaged
 
Throttle linkage is bent or binding (sticking)
 
TP sensor is damaged or has failed
 

Trouble Code: P0123



TP Sensor Circuit High Input

Possible Causes:



TP sensor signal return circuit is open
 
TP sensor signal circuit is shorted to VREF or system power
 
TP sensor not mounted properly to the throttle body
 
TP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0125



Excessive Time To Enter Closed Loop

Possible Causes:



Inspect for low coolant level or an incorrect coolant mixture
 
Check the operation of the thermostat (it may be stuck open)
 
ECT sensor signal circuit has high resistance
 
ECT sensor has failed
 

Trouble Code: P0126



Thermostat Malfunction

Possible Causes:



Inspect for low coolant level or an incorrect coolant mixture
 
Check the operation of the thermostat (it may be stuck open)
 
ECT sensor has drifted out of calibration or it has failed
 
PCM has failed
 

Trouble Code: P0130



HO2S-11 (Bank 1 Sensor 1) Circuit Malfunction

Possible Causes:



Air leaks in intake manifold, exhaust pipes or exhaust manifold
 
Fuel delivery system component has failed (i.e., a clogged fuel filter, dirty or restricted fuel injectors, low or high fuel pressure)
 
Base engine -mechanical- problem (low cylinder compression, incorrect camshaft timing, intake or exhaust manifold leaks)
 
HO2S is damaged or has failed
 
HO2S heater element has deteriorated or failed
 
PRC solenoid or Purge solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P0134



HO2S-11 (Bank 1 Sensor 1) Circuit No Activity Detected

Possible Causes:



Air leaks in the intake manifold or exhaust manifold or pipes
 
IAT sensor or MAF sensor has deteriorated (out of calibration)
 
HO2S signal circuit is open or shorted to ground (intermittent)
 
HO2S contaminated with wrong fuel, has deteriorated or failed
 
PCM has failed
 

Trouble Code: P0140



HO2S-12 (Bank 1 Sensor 2) Circuit No Activity Detected

Possible Causes:



Air leaks in the intake manifold or exhaust manifold or pipes
 
IAT sensor or MAF sensor has deteriorated (out of calibration)
 
HO2S signal circuit is open or shorted to ground
 
HO2S contaminated with wrong fuel, has deteriorated or failed
 
TSB 0100700 (3/00) contains information for this code (MPV)
 

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: P0171



Adaptive Fuel Trim Too Lean (Bank 1)

Possible Causes:



Vehicle driven low on fuel or until it ran out of fuel
 
One or more injectors restricted or pressure regulator has failed
 
Fuel delivery system supplying too much or too little fuel during cruise or idle periods (e.g., faulty fuel pump, or dirty fuel filter)
 
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
 
Exhaust leaks before or near where the front HO2S is mounted
 
HO2S is contaminated, deteriorated or it has failed
 
Fuel control sensor is out of calibration (i.e., ECT, IAT or MAP)
 
Base engine -mechanical- fault affecting one or more cylinders
 

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: 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: 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: 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: 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: 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: 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
 
Purge solenoid valve is damaged or has failed
 
Tank pressure control valve (TPCV) is damaged or has failed
 
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 pressure control valve, check valve and rollover valve
 
PCM has failed
 

 
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