P0560 troubleshooting

working on a 2007 Prius, has a current issue of P0560. new 12v True Start battery, live data returns voltage of 13.7 in the ENGINE/ECT section. code come back immediately after clearing. car operates fine, no red triangle.

i've gone thru the Diagnostics 05-895 section and the resistance tests between the HEV fuse holder and the battery ECM connector B11-1 are well under 1 ohm. isolation of fuse holder to body around 15 meg ohm. i've changed battery ECMs to no difference. also have tried different Engine Control and HV ECMs. i'm stumped.

one thing, and tell me if this is significant, is that i have the Engine and HV ECMs out and hanging by their plugs, not bolted into the chassis. i do have a ground jumper between the ECMs and the body but it isn't like being bolted in.

-dan

 

what would normal ECM voltages be? i'd replaced the inverter with one out of a 2005 while troubleshooting different problems so i could swap the 07 one back in. haven't got the wiper area put back together yet.

 

i'll post it up tomorrow. i see the "05-895" was for a 2004. also found the similar section in a 2008 manual but had different numbers. anyway, i'll post it up.

thanks for the nomenclature lesson... it's important to be correct when troubleshooting. this has been the Prius From Hell. given to me by a friend after the dealer couldn't fix the dying-while-driving issue after having it two weeks. i pulled the rear interior out and there was water everywhere from the roof seam leaks. anyway, very very long story short, i'm at the point where it runs without issue and the only code is P0560. gotta find that problem before putting the dash back together, IF i can remember how to do that. it's been apart nearly a year.

 

thanks for all the input so far. to address questions:

- yes, the fuse was checked with a multimeter. the pins and plugs of the B and C blocks have been cleaned with Caig D5 spray. the attached file is the procedure i followed to examine the path between the HEV fuse and the battery ECU.

- scan tool data consistently shows 13.7v Engine/ECT voltage while running.

- the grounds on the driver's strut tower were cleaned and paint scraped to bare metal when inverter was replaced.

- 12v battery connections and body grounds cleaned. the positive terminal fuse and 2 connectors have been cleaned, new True Start batt as of 2 days ago.

- the Engine Control, HV, and traction battery computer connections have been cleaned with Caig Gold G5. all computers have been swapped at various points with no change in P0560 status.

interestingly, with all the chicken dance i've been doing trying to solve this code, i've left the HEV fuse out twice when trying to start. radiator fan runs on high, dash freaks out, can't turn off displays unless key is removed from slot. first time was a Wth moment, now i instantly know!

 

i'm back at the original 2007 computers for everything with the exception of the inverter is from my junker 05. probably next step is to return to the 07 inverter, yes?

 

okay. i've been using an Autel MaxiAP200 which returns lots of info and subcodes but no subcodes are reported when using the Autel nor is it telling exactly which ECU. time to go back to the Techstream i have. it's a pain to use compared to the Autel but should pinpoint the ECU. good point.

 

in the Autel, the P0560 is coming from the Engine/ECT group. this is also the location reporting the +Bm voltage of 13.7

attached is the engine running data from Engine/ECT group in the Autel. don't think it shows much.

 

right, 05-267. since i have the wipers still out, think it makes sense to just return to the 07 inverter as a first step? then i'd be 100% 07 components. i agree, the freeze frame data in this case is of limited value.