I have three trouble codes, P0030, P0131, and.

CHRISTOPHER MEADE

MEMBER
2006 CHEVROLET COBALT
73,500 MILES

I have three trouble codes, p0030, p0131, and p2431. I know the first two are 02 sensor codes, are they all related? What is the repair?

Sunday, February 17th, 2013 AT 6:54 PM

1 Reply

HMAC300

MECHANIC
48,601 POSTS

They are not related the third one is secondary air system the first two may be the O2 sensor here is test procedure for secondary air.
CIRCUIT/SYSTEM� TESTING

1. With� the� ignition� ON� and� the� engine� OFF, � observe� the� AIR� Pressure� Sensor� parameter� with� a� scan� tool� while� manipulating� all� related� wiring� and� connectors.
? If� manipulation� does� affect� the� AIR� Pressure� Sensor� parameter� then� repair� the� harness� or� connector.
2. With� the� ignition� ON, � the� engine� OFF, � and� the� solenoid� valve� disconnected, � measure� for� 5� volts� between� the� 5 volt� reference� circuit� and� ground.
? If� more� than� 5� volts� then� test� the� 5 volt� reference� circuit� for� a� short� to� voltage� or� a� faulty� control� module.
? If� less� than� 5� volts� then� test� the� 5 volt� reference� circuit� for� high� resistance, � a� short� to� ground, � or� a� faulty� control� module.
3. With� the� ignition� ON, � the� engine� OFF, � and� the� solenoid� valve� disconnected, � measure� for� 0� volts� between� the� low� reference� circuit� and� ground.
? If� more� than� 0� volts� then� test� the� low� reference� circuit� for� a� short� to� voltage� or� a� faulty� control� module.
4. With� the� ignition� ON, � the� engine� OFF, � and� the� solenoid� valve� disconnected, � inspect� for� an� AIR� Pressure� Sensor� parameter� reading� on� a� scan� tool� of� 0� volts.
? If� more� than� 0� volts� then� test� the� signal� circuit� for� a� short� to� voltage� or� a� faulty� control� module.
5. With� the� ignition� ON, � the� engine� OFF, � the� solenoid� valve� disconnected, � and� a� 3 amp� fused� jumper� wire� connected� between� the� signal� and� 5 volt� reference� circuits, � inspect� for� an� AIR� Pressure� Sensor� parameter
reading� on� a� scan� tool� of� 5� volts.
? If� less� than� 5� volts� then� test� the� signal� circuit� for� high� resistance, � a� short� to� ground, � or� a� faulty� control� module.
6. With� the� ignition� ON, � the� engine� OFF, � the� solenoid� valve� disconnected, � a� 300� ohm� fixed� resistor an� appropriate� length� of� secondary� ignition� wire� may� be� adequate installed� between� the� 5 volt� reference� circuit� and
the� low� reference� circuit, � and� a� 3 amp� fused� jumper� connected� from� the� signal� circuit� to� the� 5 volt� reference� circuit� at� the� fixed� resistor, � observe� an� AIR� pressure� sensor� parameter� reading� on� a� scan� tool� of� 5� volts.
? If� less� than� 5� volts� then� test� the� 5 volt� reference� circuit� and� the� signal� circuit� for� high� resistance� or� a� faulty� control� module.
7. With� the� ignition� ON, � the� engine� OFF, � the� solenoid� valve� disconnected, � a� 300� ohm� fixed� resistor an� appropriate� length� of� secondary� ignition� wire� may� be� adequate installed� between� the� 5 volt� reference� circuit� and
the� low� reference� circuit, � and� a� 3 amp� fused� jumper� connected� from� the� signal� circuit� to� the� low� reference� circuit� at� the� fixed� resistor, � inspect� for� a� pressure� sensor� parameter� reading� on� a� scan� tool� of� 0� volts.
? If� more� than� 0� volts� then� test� the� low� reference� circuit� for� high� resistance� or� a� faulty� control� module.
8. If� all� circuits� and� the� control� module� test� OK� then� replace� the� solenoid� valve.
You may have a short in voltage to O2 sensor. Also check fuse emission 1