Prius 2011 P148F and B1503

Does the water pump plug look broken cracked melted otherwise destroy eat up by chemical cleaners etc? Like the common things people break the tab off trying to undo it without knowledge of how to do so believe it or not and happens to millions of them doesn't make a bad connection put a little goop on the plastic push it together and let it dry to get it apart you will have to give it a very good snatch on the plastic only not the wires goop rolls up and throws away and can be regooped if need be. Usually when I install one of these pumps I don't bolt it up to the car but plug it up and stand it up power up the car call up the water pump with tech or just turn on the car and usually the water pump will come on for a second You can see it's going to spin things look okay turn the car back off bolt up the pump add cool slowly like you're supposed to off you go In these cars you're not going to see coffee in your oil That's not how this works in this system matter of fact that's extremely rare unless you can break a coolant jacket enough to wear its spewing in water at a pretty good rate I've not seen it personally I haven't Chevrolets and straight sixes and other vehicles forklifts and the like but not in a 2Z Toyota engine in a Prius or a Corolla.

 

Does the water pump plug look broken cracked melted otherwise destroy eat up by chemical cleaners etc? Like the common things people break the tab off trying to undo it without knowledge of how to do so believe it or not and happens to millions of them doesn't make a bad connection put a little goop on the plastic push it together and let it dry to get it apart you will have to give it a very good snatch on the plastic only not the wires goop rolls up and throws away and can be regooped if need be. Usually when I install one of these pumps I don't bolt it up to the car but plug it up and stand it up power up the car call up the water pump with tech or just turn on the car and usually the water pump will come on for a second You can see it's going to spin things look okay turn the car back off bolt up the pump add cool slowly like you're supposed to off you go In these cars you're not going to see coffee in your oil That's not how this works in this system matter of fact that's extremely rare unless you can break a coolant jacket enough to wear its spewing in water at a pretty good rate I've not seen it personally I haven't Chevrolets and straight sixes and other vehicles forklifts and the like but not in a 2Z Toyota engine in a Prius or a Corolla.

 

No you go cut the water pump connector the plug That's the car side out of a car sitting in like a junkyard You cut the plug off with two or three inches of wire sticking off the plug squeeze your cutters put it in your pocket take it with you they don't want to sell it to you stuff like that they don't care anything about It's just you have to go over there and do the cutting with your channel lock side gutters. Usually the pump over rev is because with the small head gasket leaking it's heating up pretty good and the pump is working itself to death trying to move the water fast enough to cool it It can't so it's killing itself and the computer is telling you it's over revving That's what it sounds like to me I've replaced a couple of these and the two generation 3s I've had the unfortunate luck to own.

 

SWP is the signal from the ECM to the pump, telling the pump how fast to spin. The pullup for that signal is in the pump itself, so if that circuit goes open, the pump thinks it's being commanded to run flat out.

The P148F is the ECM saying "wait a sec, pump is running faster than I said to." So no mystery there.

B1503 is an unexpected temperature reading in the coolant coming back from the EHRS. I suppose that could be a consequence of the pump running flat out when it doesn't need to, though I wouldn't have guessed that from the way the detection condition is written. That makes it sound like the code is mostly for less-subtle things, like a wiring problem to that temperature sensor.

As for the connection to B2784, I got nuthin'. Smile and don't think about it too hard.