2010 Prius P0A0F-524 and P0335
Seems pretty cut and dry, NE signal error. Put in new OEM crank sensor today same thing. Does anyone have any suggestions or notice anything I am missing in the Freeze Frame data?
Hey Travis, not to be rude but how did you figure out if CKP sensor was bad? was it because of the DTC P0335? whats the history on the vehicle? these battery seems weak to me and I always had issue with toyota with starting on weak battery?
Freeze frame data on Toyota isn't a big help when diagnosing issues. What else besides changing CKP have you done. This is simple to grab the CKP signal with a scope, I have yet to see a Prius with a bad timing chain, so I wouldn't suspect that timing has changed. Have you verified the basics, spark, fuel, etc.? Compare relative compression with a synch probe to #1. Quick and easy. This tells…
Based on the freeze frames, my assumption is that this is not a hard failure. If you clear the DTC's, you have to drive it a few minutes before the DTC's will reset. I would be scoping the CKP while driving or at least while running ICE at high rpm.
Looking at the freeze frame: You have an engine speed signal so the PCM is seeing something, but maybe it doesn't like what it sees. I'd scope it. Here's a known good screen shot. I'll try to find the raw file. The MAF is measuring air but the MAP is showing atmospheric pressure at 13-14PSI. Could there be a large vacuum leak (purge, PCV or both lines off)? This would explain the P0A0F. At -3…
I beleive this engine atkinson cycles if im not mistaken that might explain map reading at idle.
Correct, but it should still create vacuum at lower RPM. Here's a data capture from a Gen 3 Prius at idle.
Most engines that Atkinson cycle will have much lower vacuum at idle as well for pumping loss reduction. They will phase the intake cam retarded and open throttle more. newer engines fake Atkinson cycle and also for start up Emissions reduction and pumping losses where the intake timing is also retarded. that scan data also shows low vacuum at idle as well with map pressure at 1300 rpm near 13…
I totally agree but I still feel on the freeze frame at -3 the vacuum should be lower. My data capture was not a cold start but you can see where the ICE cranked and vacuum was created.
I am wondering with all the provided info (!), did this vehicle ever get fixed…? Any update on its status…?
On a hunch put a cam sensor in it. Fixed…. will post waveform from bad one when it gets scoped