Having problems have some codes...

[hypnotic]

I have problems with bucking under load and I ran some codes here they are:

556-Fuel Pump Relay primary circuit fault
121-Closed throttle voltage higher or lower than expected
122-Throttle Position sensor below minimum voltage
157-Mass Air Flow sensor fault, low voltage
542-Fuel Pump relay secondary circuit fault
543-Fuel Pump relay secondary circuit fault

I got the MAF low voltage before and I just cleaned it and it went away, but that was only a couple of days ago. I'd like to know more about the primary and secondary fuel pump circuit fault.

Any input would be helpful.

-Craig

 

[hypnotic]

No takers?

 

[ohfosho]

what problem are you having with the car running and driving?

usually the fuel pump codes mean nothing... the secondary circuit code comes on every time the car stalls for whatever reason.

if you are having troubles starting the car (sometimes due to low fuel pressure), it could mean that your fuel pump is weak, or you should start by checking the relay and fuses.

you may have TPS replacement coming soon too. try reseting your compu and and see what pops back up

 

[hypnotic]

Thanks, I am having a problem with bucking under load. Its fine driving all day if I shift under 4000 rpms, as soon as I get into the power it bucks and then it will start doing it a lot more. And then sometimes, rarely, I can slowly get into the power with no effects. I just got a newer tps from a 95 in the junk yard yesterday with no effects. I still have to get more codes though since I reset it.

-craig

 

[SHOZ123]

Check the voltage at the TPS. Input volts should be 5V.