Is this a bad fuel pump current reading?

Senior_Citizen · Post by **Senior_Citizen** » Tue Feb 23, 2021 11:43 pm

Hello,

I'm new at this. Could someone help me determine if this is a good fuel pump or not? It's from a 2005 Pontiac Vibe (which is a Toyota with a Pontiac emblem on it). I have a Pico 2204A so I don't have access to view the wafeform library being my scope isn't an automotive scope. I wish I could see examples of good and bad Toyota fuel pumps.

I'm not sure what current my Toyota fuel pump should have, but I'm showing as high as 3.9 amps and as low as 3.3 amps on the wafeform. Vehicle running, pump RPM is showing 4974.4, (assuming I'm accurately on two identical humps measuring 1 rotation). I'm not sure how to count the commutator bars of this pump because my wafeform humps look so different from each other.

Any help reading my wafeform would be greatly appreciated.

liviu2004 · Post by **liviu2004** » Wed Feb 24, 2021 7:48 pm

Pump is bad.

Senior_Citizen · Post by **Senior_Citizen** » Wed Feb 24, 2021 8:29 pm

Thanks! I appreciate that. Just so that I can get better at reading my Pico screen, what all tells me the pump is bad? Is it just the uneven wafeform humps, or is it also the current level too high or too low, or the RPM out of range?

liviu2004 · Post by **liviu2004** » Thu Feb 25, 2021 4:05 pm

Uneven waveform.

Senior_Citizen · Post by **Senior_Citizen** » Thu Feb 25, 2021 5:03 pm

Thanks

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