DTC P1116 CHS coolant sensor circuit stack (revisit plus)

Sorry to hear you are still having DTCs

How many miles are on this vehicle?

Which troubles codes did you pull this time?

 

What DTCs are you currently reading (if any) after the above parts replacement ??

 

The subject line says P1116.

It isn't helpful to start a new thread for an old issue, especially without including links to the earlier threads on the same issue ... in essence you're saying that you "reviewed multiple related posting and suggested paths to resolve" but you're throwing an obstacle in the path of your readers (whom you're asking for help) to do the same.

So if you've looked up the detection condition for P1116 in the repair manual, you see there are two ways the code can be triggered. Both happen during the hot coolant recovery cycle, right after you shut down the car. The engine coolant is supposed to be hot, and the car is pumping it into the thermos, so it expects the thermos temperature sensor reading to rise. By the end of the pump cycle it should be close to the engine coolant temperature sensor reading.

The P1116 gets set for one of two reasons: (a) the thermos temperature sensor didn't even rise more than 3 C during the recovery cycle, or (b) it rose, but was still not within 25 C of the engine coolant sensor by the end of the cycle.

Do you have Techstream? You could pull up the live data, and watch that sensor reading during a recovery cycle, just to find out, for starters, which of those two cases you've got. Then it's a matter of tracking down why it's happening that way.

-Chap

 

Should be able to look it up on parts.toyota.com (which shows list prices though, dealers will often sell for less online).

Might want to take the usual steps of checking for voltage at the pump, and so on, to be sure the problem isn't somewhere else. Would be frustrating to go to the trouble of swapping the pump and have the new one not pump either. There should be step-by-step troubleshooting tips in the book.

-Chap