Mazda Car 2002-04

1.6L L4 - Std 2

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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
 

Trouble Code: P0461



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
 
Fuel gauge sending unit power circuit is open
 
Fuel gauge sender signal is shorted to fuel pump terminal
 
PCM has failed
 

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: 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: P0660



Variable Inertia Charging System Circuit Malfunction

Possible Causes:



VICS control circuit is open or shorted to ground
 
VICS power circuit is open (check the power from the relay)
 
VICS valve is damaged or has failed
 
PCM has failed
 

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: P0705



Neutral Switch Circuit Malfunction

Possible Causes:



Neutral switch signal circuit is open or shorted ground
 
Neutral switch power circuit open between switch and PCM
 
Neutral switch ground circuit open between switch and ground
 
Neutral 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: P1102



MAF Signal Inconsistent With TP Sensor (Too Low)

Possible Causes:



MAF sensor signal circuit is open or grounded (intermittent)
 
MAF sensor is damaged, dirty or has failed
 
MAF sensor (inlet) screen is dirty or blocked
 
TP sensor is damaged or erratic in operation
 
PCM has failed
 

Trouble Code: P1103



MAF Signal Inconsistent with Engine Speed (Too High)

Possible Causes:



MAF sensor signal circuit is open or grounded (intermittent)
 
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: P1122



Throttle Position Signal Low Input (Stuck Closed)

Possible Causes:



TP sensor is broken damaged or has failed
 
TP sensor signal circuit is corroded or shorted in the connector
 
High resistance in the VREF circuit or intermittent loss of VREF
 
PCM has failed
 

Trouble Code: P1123



Throttle Position Signal High Input (Stuck Open)

Possible Causes:



TP sensor is broken damaged or has failed
 
MAF sensor has drifted out-of-calibration, or it is contaminated
 
TP sensor signal circuit is corroded or shorted in the connector
 
High resistance in the TP sensor ground circuit
 
PCM has failed
 

Trouble Code: P1135



HO2S-11 (Bank 1 Sensor 1) Heater Circuit Low Input

Possible Causes:



HO2S heater control circuit is open or shorted to ground
 
HO2S heater power circuit open between sensor and ignition
 
HO2S heater is damaged or has failed
 
PCM has failed
 

Trouble Code: P1136



HO2S-11 (Bank 1 Sensor 1) Heater Circuit High Input

Possible Causes:



HO2S heater control circuit is shorted to power
 
HO2S heater is damaged or has failed
 
PCM has failed
 

Trouble Code: P1141



HO2S-12 (Bank 1 Sensor 2) Heater Circuit Low Input

Possible Causes:



HO2S heater control circuit is open or shorted to ground
 
HO2S heater power circuit open between sensor and ignition
 
HO2S heater is damaged or has failed
 
PCM has failed
 

Trouble Code: P1142



HO2S-12 (Bank 1 Sensor 2) Heater Circuit High Input

Possible Causes:



HO2S heater control circuit is shorted to power
 
HO2S heater is damaged or has failed
 
PCM has failed
 

Trouble Code: P1170



HO2S-11 (Bank 1 Sensor 1) Circuit No Inversion

Possible Causes:



An air leak that is located after the MAF sensor
 
Base engine mechanical fault affecting one or more cylinders
 
EVAP Purge valve stuck or the hoses to the valve are reversed
 
Fuel metering fault (fuel injector sticking open or leaking)
 
Fuel pressure too low or too high, fuel supply contaminated
 
HO2S element is contaminated or the HO2S heater has failed
 
PCV system has air leaks at the valve or related hoses
 

Trouble Code: P1250



Pressure Regulator Control Solenoid Circuit Malfunction

Possible Causes:



PRC solenoid control circuit is open
 
PRC solenoid control circuit is shorted to ground
 
Fuel pump relay power circuit is open
 
PCM has failed
 

Trouble Code: P1345



Camshaft Position (SGC) Sensor Circuit Malfunction

Possible Causes:



CMP sensor signal circuit is open or shorted to ground
 
CMP sensor signal circuit is shorted to VREF or system power
 
CMP sensor power circuit open between sensor and main relay
 
CMP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1449



CDCV or TPCV Circuit Malfunction

Possible Causes:



CDCV control circuit is open or shorted to ground
 
CDCV control circuit is shorted to power
 
CDCV power circuit is open between the valve and main relay
 
CDCV is damaged or has failed
 
TPCV solenoid control circuit is open or shorted to ground
 
TPCV (valve) is damaged, leaking or has failed
 
PCM has failed
 

Trouble Code: P1450



EVAP Control System (Leak Down)

Possible Causes:



Air filter element is extremely dirty or clogged
 
Canister drain cut valve (CDCV) is damaged or has failed
 
Tank pressure control valve (TPCV) 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
 
PCM has failed
 

Trouble Code: P1455



Fuel Tank Level Sensor Circuit Malfunction

Possible Causes:



Fuel tank level sensor signal circuit open or shorted to ground
 
Fuel tank level sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1487



EGR Boost Sensor Solenoid Valve Circuit Malfunction

Possible Causes:



EGR boost sensor solenoid circuit is open or shorted to ground
 
EGR boost sensor solenoid circuit is shorted to system power
 
EGR boost sensor solenoid circuit is open or shorted to ground
 
EGR boost sensor solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P1496



EGR Valve Stepper Motor Coil 1 Circuit Malfunction

Possible Causes:



EGR Coil 1 control circuit is open or shorted to ground
 
EGR Coil 1 control circuit is shorted to power
 
EGR Coil 1 power circuit open between valve and main relay
 
EGR Coil 1 is damaged or has failed
 
PCM has failed
 

Trouble Code: P1497



EGR Valve Stepper Motor Coil 2 Circuit Malfunction

Possible Causes:



EGR Coil 2 control circuit is open or shorted to ground
 
EGR Coil 2 control circuit is shorted to power
 
EGR Coil 2 power circuit open between valve and main relay
 
EGR Coil 2 is damaged or has failed
 
PCM has failed
 

Trouble Code: P1498



EGR Valve Stepper Motor Coil 3 Circuit Malfunction

Possible Causes:



EGR Coil 3 control circuit is open or shorted to ground
 
EGR Coil 3 control circuit is shorted to power
 
EGR Coil 3 power circuit open between valve and main relay
 
EGR Coil 3 is damaged or has failed
 
PCM has failed
 

Trouble Code: P1499



EGR Valve Stepper Motor Coil 4 Circuit Malfunction

Possible Causes:



EGR Coil 4 control circuit is open or shorted to ground
 
EGR Coil 4 control circuit is shorted to power
 
EGR Coil 4 power circuit open between valve and main relay
 
EGR Coil 4 is damaged or has failed
 
PCM has failed
 

Trouble Code: P1504



Idle Air Control Solenoid Circuit Malfunction

Possible Causes:



IAC solenoid No. 1 or No. 2 control circuit is open
 
IAC solenoid No. 1 or No. 2 control circuit is shorted to ground
 
IAC solenoid is damaged or has failed (an intermittent fault)
 
PCM has failed
 

Trouble Code: P1512



Variable Timing Control System Shutter Valve (Stuck Closed)

Possible Causes:



CKP sensor is damaged or has failed
 
EGR boost sensor is out of calibration
 
Fuel control sensor is out-of-calibration (ECT, IAT, MAF or TP)
 
VTCS control circuit shorted to ground or to system power (B+)
 
VTCS shutter valve actuator is stuck closed
 
VTCS vacuum hose is loose or disconnected
 
PCM has failed
 

Trouble Code: P1562



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: P1569



Variable Timing Control System Circuit Low Input

Possible Causes:



VTCS control circuit is open or shorted to ground
 
VTCS power circuit open between the solenoid and main relay
 
VTCS solenoid valve is damaged or has failed
 
PCM is damaged
 

 
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