Abs codes please help

Well, those codes might indicate there are some issues to look at, but the behavior you describe isn't one of them ... that's just the hill start feature working exactly as it's designed to. You're at a stop (usually on a hill), you push the brake down a little harder, the skid light blinks to confirm you're in hill start, then you can move your foot to the go pedal and take a couple seconds without rolling.

As for those codes, I'm afraid I don't have them memorized. Have you looked them up? What did you find?

-Chap

 

Was the only reason for sitting the head gasket and water pump? It was their something else?

How many miles on your Prius?

The c1203 is for an incorrect ECU which is the reason for that question.

C1345 is for the linear valve offset learning undone. This is also related to the brake booster with the master cylinder.

What I would do if no work was done other than the head gasket and water pump and you are sure there is nothing else that has happened in the cars history would be to disconnect the 12v battery for a period of time to allow all the computers to reset, then reconnect the 12v and see what codes return.

Good luck and keep us posted .

 

Ok, I had a moment to look them up. The last three of those codes are simply about calibrations being lost (C1336, the acceleration sensor zero point; C1345, the linear solenoid offset, as Ray mentioned; C1392, the stroke sensor zero point). If the car sat for long enough with no (or deeply discharged) 12 V supply to the constantly-powered (usually labeled B) circuits of the ECUs, those calibrations could have been forgotten.

Once you have a solid reliable 12 volts, if you have Techstream as you say, you'll find utilities on the brake/skid ECU page for telling the ECU to relearn those calibrations. It's as simple as that. There are some simple preconditions in the repair manual (such as, make sure you're parked in a level spot before setting the acceleration zero point, etc.) that you can review, but usually the utility in Techstream will kind of step you through the requirements.

The C1203 is an odd one. I'm not sure what Ray means saying it's "for an incorrect ECU." It's a code about communication between the brake/skid ECU and the ECM, but the detection condition is a little mysterious. (Maybe it's clearer in Japanese.) It's set if "no stored information for destination", "no stored information whether VSC is in operation or not", or "destination information from HV-ECU does not match with stored value".

I'm pretty sure "destination" here has nothing to do with nav, and probably refers to settings made at the factory identifying the regional market into which the car's being sold. (Maybe that was what Ray meant.) But this also sounds like a kind of stored setting that may have been lost. Maybe you will see something about it in the Techstream live data. Maybe it will recover after a reset as Ray suggests, or maybe not; I'd be interested to hear.

I'm not seeing anything about a way to reenter that information, but it might happen as part of a reflash at the dealer. Replacing the ECU would be the fallback plan....

-Chap