Prius 2004 Gen II ECM replacement with P2610 OBD code

I don't have experience with this particular code, but typically a dealership fixes cars under warranty so they'll replace very expensive parts at Toyota's expense even when it's not the root of the problem because they could care less about diagnostics, just jacking up as many warranty charges against Toyota as they can get away with is their highest priority.

Likewise, if they start replacing expensive stuff at your expense, they'll likely keep replacing expensive stuff until it's fixed and they rarely pick the right part to replace on the first try, so it could cost you ten times as much at a dealership than going to a legitimate auto mechanic who fixes non-warranty problems at the lowest cost possible because that's what customer loyalty requires.

There's a reason we call them stealerships instead of dealerships...

 

Probably not, but there are some PriusChat folks who own both of these vehicles and might know the correct answer...

 

Yea, but that's a bunch of money to spend on something that may not solve the problem... There was a guy on here a month ago who had a friend with the same Prius as him and was able to keep swapping out parts to diagnose problem.

If I were you I'd do some digging via google search to find all the other things to check/fix before you start spending hundreds on parts that may or may not fix it. And hopefully someone with more experience with this problem will see this thread and further advise...

 

Arya,

If you'd like to wait a few hours, I can look in my stockpile at home and see if I have one. I'd be happy to mail it to you to swap out and see if it solves your problem. If it doesn't, then you wasted no money except shipping. If it solves your problem, we can work something out much better than that ebay price. I'm not sure if it's something that has to be matched to the car or not, or immobilizer programmed, etc.

You could also read this just to review that code:

P2610 ECM/PCM Internal Engine Off Timer Performance

 

That's very kind of you!

 

It looks like all I have is a 89661-47250. I don't know if it's compatible or not. Here's photos of the label and the plug receptacles. Let me know if you'd like to try it.

 

If you do some googling with key word 'Priuschat' you should find lots of info on that... I remember someone mentioning that there's a service that reprograms them to match your vehicle.

 

See the Repair Manual (more info), under Engine/Hybrid System: Engine Control System: ECM (1NZ-FXE): Replacement, for the 54-step procedure, which is mostly cross-references to the procedures for disassembling the instrument panel to get access to the ECM mounting location. The only initialization mentioned is for the power window control system; that’s done whenever the 12-volt battery negative terminal is disconnected.

Perhaps others who have replaced an ECM will comment on their experiences; I can only share some information from published documents.

For 2004 models, it may or may not be necessary to store the Vehicle Identification Number into the replacement ECM. See Toyota Technical Service Bulletin EG045-04, “Entering VIN During ECM (PCM) Replacement and/or DTC P0630,” revised January 24, 2005, which states, “2004 model year vehicles which have been flash reprogrammed may contain updated 2005 model year OBD II logic. These vehicles will require VIN entry into the ECM (PCM) after reprogramming.”

If you want to be diligent, and you have the necessary tools, you could also check whether the hybrid vehicle control ECU or the replacement ECM needs the software updates from Special Service Campaign 50P. For 2004 models, the new calibration IDs are 899834717001 and 34705200, respectively.

The bulletin and campaign instructions explain how to do the VIN input and software updates using the Toyota Diagnostic Tester, available when the documents were written, but it should also be possible to do those tasks using the current Toyota Techstream diagnostic system.

 

I realize I am jumping in late, but what diagnostic tests have been performed that condemn the ECM? ECM failures outside of voltage spikes from jump-starting are very unusual. The ECM off timer fault can be caused by interrupting the B+ circuit to the ECM, thereby preventing the internal clock from counting. There are other wiring related causes, but this is the most common I have seen.

 

Hello Arya: Did you ever fix the problem? I want to know because I am also having the same error code P2610. Any lead or advice on what to do would be greatly appreciated. Thank you.