Mazda Car 2002-04

3.0L V6 - Auto 4

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Trouble Code: P2401



EVAP system leak detection pump motor circuit low

Possible Causes:



EVAP system leak detection pump malfunction
 
Poor connection of EVAP system or PCM connector
 
PCM has failed
 

Trouble Code: P2402



EVAP system leak detection pump motor circuit low

Possible Causes:



EVAP system leak detection pump malfunction
 
Poor connection of EVAP system or PCM connector
 
PCM has failed
 

Trouble Code: P2404



EVAP system leak detection pump sense circuit problem

Possible Causes:



Air filter clogging
 
EVAP hose bending
 
PCM has failed
 

Trouble Code: P2405



EVAP system leak detection pump sense circuit low input

Possible Causes:



EVAP system leak detection orifice has fallen off
 
EVAP system leak detection pump motor malfunction
 
PCM has failed
 

Trouble Code: P2407



EVAP system leak detection pump sense circuit intermittent

Possible Causes:



EVAP system leak detection pump heater malfunction
 
PCM has failed
 

Trouble Code: P2502



Charging system voltage problem

Possible Causes:



Open circuits between battery terminals
 
Battery is malfunctioning* Poor connection of PCM connectors
 
Generator malfunction
 
PCM has failed
 

Trouble Code: P2503



Charging system voltage low

Possible Causes:



Open circuits between battery terminals
 
Battery is malfunctioning* Poor connection of PCM connectors
 
Generator malfunction
 
PCM has failed
 

Trouble Code: P2504



Charging system voltage high

Possible Causes:



Short to power circuit between generator and PCM
 
Generator malfunction
 
PCM has failed
 

Trouble Code: P2507



PCM B+ voltage low

Possible Causes:



Melt down fuse* Poor connection of PCM
 
PCM has failed
 

Trouble Code: P2676



Variable Air Duct (VAD) control solenoid valve circuit low input

Possible Causes:



Open circuits between main relay and VAD terminals
 
Short circuits between VAD terminals and PCM terminals* Poor connection of PCM connector
 
VAD solenoid valve malfunction
 
PCM has failed
 

Trouble Code: P2677



Variable Air Duct (VAD) control solenoid valve circuit high input

Possible Causes:



Open circuits between main relay and VAD terminals
 
Short circuits between VAD terminals and PCM terminals* Poor connection of PCM connector
 
VAD solenoid valve malfunction
 
PCM has failed
 

Trouble Code: U0101



Data Circuit Malfunction

Possible Causes:



SCP data bus to other controller(s) is open or shorted to ground
 
A/C System controller is damaged or has failed
 
PCM has failed
 

Trouble Code: U0121



Data Circuit Malfunction

Possible Causes:



SCP data bus to other controller(s) is open or shorted to ground
 
A/C System controller is damaged or has failed
 
PCM has failed
 

Trouble Code: U0155



Data Circuit Malfunction

Possible Causes:



SCP data bus to other controller(s) is open or shorted to ground
 
A/C System controller is damaged or has failed
 
PCM has failed
 

Trouble Code: U0167



Data Circuit Malfunction

Possible Causes:



SCP data bus to other controller(s) is open or shorted to ground
 
A/C System controller is damaged or has failed
 
PCM has failed
 

Trouble Code: U0302



Data Circuit Malfunction

Possible Causes:



SCP data bus to other controller(s) is open or shorted to ground
 
A/C System controller is damaged or has failed
 
PCM has failed
 

Trouble Code: U1020



Data Circuit Malfunction

Possible Causes:



SCP data bus to other controller(s) is open or shorted to ground
 
A/C System controller is damaged or has failed
 
PCM has failed
 

Trouble Code: U1039



Data Circuit Malfunction

Possible Causes:



SCP data bus to other controller(s) is open or shorted to ground
 
Vehicle Speed System controller is damaged or has failed
 
PCM has failed
 

Trouble Code: U1040



Data Circuit Malfunction

Possible Causes:



SCP data bus to other controller(s) is open or shorted to ground
 
Vehicle Speed System controller is damaged or has failed
 
PCM has failed
 

Trouble Code: U1051



Data Circuit Malfunction

Possible Causes:



SCP data bus to other controller(s) is open or shorted to ground
 
ABS System controller is damaged or has failed
 
PCM has failed
 

Trouble Code: U1131



Data Circuit Malfunction

Possible Causes:



SCP data bus to other controller(s) is open or shorted to ground
 
Fuel System controller is damaged or has failed
 
PCM has failed
 

Trouble Code: U1147



Data Circuit Malfunction

Possible Causes:



SCP data bus to other controller(s) is open or shorted to ground
 
Vehicle Security System controller is damaged or has failed
 
PCM has failed
 

Trouble Code: U1451



Data Circuit Malfunction

Possible Causes:



SCP data bus to other controller(s) is open or shorted to ground
 
Anti-Theft System controller is damaged or has failed
 
PCM has failed
 

Trouble Code: U1262



Data Circuit Malfunction

Possible Causes:



SCP data bus to other controller(s) is open or shorted to ground
 
Anti-Theft System controller is damaged or has failed
 
PCM has failed
 

Trouble Code: U1900



Data Circuit Malfunction

Possible Causes:



SCP data bus to other controller(s) is open or shorted to ground
 
Vehicle Security System controller is damaged or has failed
 
PCM has failed
 

Trouble Code: U2013



Data Circuit Malfunction

Possible Causes:



SCP data bus to other controller(s) is open or shorted to ground
 
Vehicle Security System controller is damaged or has failed
 
PCM has failed
 

Trouble Code: U2023



Data Circuit Malfunction

Possible Causes:



SCP data bus to other controller(s) is open or shorted to ground
 
Vehicle Security System controller is damaged or has failed
 
PCM has failed
 

Trouble Code: U2050



Data Circuit Malfunction

Possible Causes:



SCP data bus to other controller(s) is open or shorted to ground
 
Vehicle Security System controller is damaged or has failed
 
PCM has failed
 

Trouble Code: U2051



Data Circuit Malfunction

Possible Causes:



SCP data bus to other controller(s) is open or shorted to ground
 
Vehicle Security System controller is damaged or has failed
 
PCM has failed
 

Trouble Code: U2243



Data Circuit Malfunction

Possible Causes:



SCP data bus to other controller(s) is open or shorted to ground
 
Vehicle Security System controller is damaged or has failed
 
PCM has failed
 

Trouble Code: P0733



Transmission 3rd Gear Ratio Incorrect

Possible Causes:



ATF level is too low, or the ATF is badly deteriorated
 
A/T line pressure is low, or the oil pump has failed
 
SSA, SSB, SSC or the PCS is stuck (mechanical fault)
 
A/T 3-4 clutch is slipping (mechanical fault)
 
A/T 2-3 or the 3-4 shift valve is stuck (mechanical fault)
 
A/T Pressure regulator or the pressure modifier valve is stuck
 
A/T solenoid reducing valve is stuck (mechanical fault)
 
PCM has failed
 

Trouble Code: U0073



Data Circuit Malfunction

Possible Causes:



SCP data bus to other controller(s) is open or shorted to ground
 
A/C System controller is damaged or has failed
 
PCM has failed
 

 
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