12 Volt battery replaced. Now engine idle at 1640 RPM

When you say "idles", do you mean after the car has gone through the full warm-up cycle to S3/S4? When in S1 (and S2?) the engine will "idle" at a higher RPM.

You can reset the auto window just by going all the way down, then all the way up and hold for a couple secs.

 

Did you run the engine long enough for it to warm up?

What was the idle speed prior to your replacement of the battery?

You might clean the throttle body interior and throttle plate. If that doesn't help, try disconnecting the 12V battery negative cable where it bolts to the body for a few minutes, allowing the ECUs to power down. Then when you reconnect power, maybe the engine ECU will allow normal idle speed.

 

What are the symptoms if the inverter got toasted with bad polarity on a jump or 12V install?

 

It would be dead jim.

OP: Look closely at the Hybrid battery screen. Whats the state of charge doing? Is it bouncing between fully charged and low? Keep an eye on it to see if its getting flaky.

Whats the history on the car? Bought new, used what?

 

First thing that comes to mind is check the 12v battery. It may be bad. Put a charger on it and see how much current its consuming and how long it takes to charge. On my new Optima it pulls 5 amps at the instant start and within 5 mins its fully charged 0 draw in 2 amp mode.

Also when you replaced the hose was that on the Inverter tank? If so there may be air in the Inverter coolant system and the Inverter is overheating. In READY open the Invert tank and look inside for turbulence and good flow/movement of the fluid in the tank. Then listen to the pump located behind the drivers headlight. Wait till engine shuts off in ready so its quiet under the hood. Should be soft whine not gurgling. then feel the Inverter. Should be very warm but not hot.
Btw, there's a service campaign on replacing all Gen II coolant pumps. Was yours replaced?

But the car is not throwing any codes though. If you do start to suspect the Hybrid battery to rule the battery out is take it to the dealer and they hook techstream laptop up and they take it for a ride and check battery soc , delta and balance and charging.
They can tell real quick if the battery module is having any issues. They charge $125 diag fee. Also its important if any codes are captured you report them here so we can help.

 

edthefox5,

I know you've been here a long time & you're a valued contributor with many posts, but I must make just 2 minor corrections to your 2nd paragraph. First, the OP isn't going to have any quiet under the hood, since he explained that his engine is ALWAYS idling & WON'T shut off. And 2nd, the service campaign to replace the inverter coolant pump is only for 2004 through PART of the 2007 model years (NOT all of the 2G's).

Ken (in Bolton,Ct)

 

Hi Dwayne,

If you don't see the traction battery SOC gauge quickly moving up and down, I would not list the traction battery as an immediate suspect.

Is the air conditioner compressor turned off, when you are making these observations about engine idle speed? If no, then turn off the AC and see what happens.

 

I stand corrected. Thank you.

 

I would recommend disconnecting the battery while cleaning the throttle body then seeing what happens. When the battery is disconnected the settings go back to that of a new, clean engine and throttle body which will make the engine run weird if it is dirty. Either way the settings will re-learn in time.

 

How long is "time" in these cases? a day of driving, a week, or more? I recently replaced my 12V with an optima yellow top, without trying to preserve the settings and everything seemed to be good after about 100 yds.

 

What is engine/cooler temperature reading?
May be the temperature sensor is bad and ECU thinks the engine is still cold.

 

I just took in my 2005 Prius for a fuel injection, oil change, and tune-up. I haven't yet replaced the battery. How is that replaced? Do auto shops do that or the dealer? Does a reputable shop check for this? I'm assuming so now. About 4 years ago at a dealer, in all they said was "wait and see" because they had never changed the battery yet themselves and didn't know how long they would last. I hear getting a fuel injection increases mileage? Any info would be appreciated. Thanks! I haven't needed to replace brakes or anything else that costs a lot. My fuel injection will cost $140. That's the most I've paid for any type of service besides the tune-up/oil change.

 

the battery can be replaced by anybody. you are going to need one soon, so it might be a good idea to do so preventatively. you can get toyota original or optima aftermarket. prices with labor run from $150. - $300. all the best!

 

I suppose you mean that the fuel injectors will be cleaned. If you have not noticed any driveability problems and buy a decent gasoline brand, there is no need for that service.

 

The thing fuel injection cleanings clean the most is your wallet. I recommend putting a bottle of Techron concentrate in once in a while, maybe after oil changes. You can get 14 bottles of Techron for the same amount of the wallet cleaning. Watch out for wallet flushes as well!

 

Could be a few seconds or a few days. The point is that they will re-learn themselves.