Need a little help

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Confirm that you have 12v at the jump points under the hood. If not, check your work and the 12v battery in the rear. If low voltage, and you purchased a new battery (with a warranty), take it into the retailer for a test/charge/replacement, whatever they will offer.

Since the 12v went low (which likely reset the fuel trims to factory settings), and before attempting a single restart on an already questionable HV battery, clean up the MAF sensor first (use MAF cleaner, etc). Report back here on if the vehicle turns over or not (dies after 7 seconds), and or what warning lights are being displayed on the dash (*). Don't try to restart if it dies after X seconds.

Which part of Minnesota are you near, as that is a fairly large state.

FYI : you're moderated until you've posted 5 times.

(*) Generally speaking, if you have warning lights being displayed on the dash, you'll also have OBD2 codes being stored in the computers (ECUs), use a hybrid compatible scanner to retrieve those stored codes, knowing the codes may help in diagnosing or repairing the vehicle with less expense and time. Disconnecting the 12v will clear the codes, so always write them down first.

 

after jumpstarting the 12v battery you need to drive the car around for a long time to charge it back. Letting the Prius sit for a long time is bad for both 12v and main HV battery. Old gas sitting for a long time is a bummer too, you're lucky if fuel pump is still in good condition otherwise you'll be surprised that you can't buy the pump separately as a unit on a Prius.

 

Better to use a charger on the 12 volt. If you are anywhere near @strawbrad (Richfield MN) give him a call and see if he can help, seeing as you alluded to your knowledge level. His info is in this post.

How to Change the HV Battery CELL / Module/s on Gen 1 Prius | Page 2 | PriusChat

 

Strictly speaking, it just needs to be in READY for a long time. Unlike many other cars, it doesn't charge any faster when driving than just sitting there in READY. But "a long time" is no joke; figure 15 hours anyway.

 

you can try grid charge the HV battery, maybe it has chances of being revived otherwise you'll have to spend on rebuilding or putting in a new battery. The fuel pump is just a guess, you could have other major issues for letting it sit.

 

It is not a foregone conclusion the hybrid vehicle (HV) battery is toast.it may just need charging as highmilesgarage said. You can determine this by looking at the block voltages of the HV battery using your scan tool.

The DTC P2118 has the fortune cookie text :Throttle Actuator Control Motor Current Range / Performance".

It could be:

• Open in ETCS power source circuit;
• ETCS fuse; or
• ECM.

The repair manual will take you through the steps to determine which of these areas might be at fault.

DESCRIPTION

The Electronic Throttle Control System (ETCS) has a dedicated power supply circuit. The voltage (+BM) is monitored and when the voltage is low (less than 4 V), the ECM concludes that the ETCS has a fault and current to the throttle control motor is cut.

When the voltage becomes unstable, the ETCS itself becomes unstable. For this reason, when the voltage is low, the current to the motor is cut. If repairs are made and the system has returned to normal, turn the power switch OFF. The ECM then allows current to flow to the motor and the motor can be restarted.

HINT: This Electrical Throttle Control System (ETCS) does not use a throttle cable.

You could check that the throttle actuator plate turns freely and try lubricating it with light machine oil to see if you can make it move freely. Just WAG.

 

Diy Grid charger $100
DiY Grid Charger | PriusChat

Prolong charger $429
Prolong discharger $300
Total $700 hopefully it revives your battery, if not, replacing your battery is another $850
Total $1550, be sure your battery is a suitable candidate for grid charging.

Or a quality rebuilt battery from Minnesota @strawbrad $850 installed at your location

 

I have seen several reverse polarity jumps performed. Every one has blown more than just the fusible link. You should check all the fuses in the underhood fuse box. Although the hybrid battery may be weak and wasn't able to start the car the first time, if you disconnect the 12v battery for a few moments, all codes will erase from the cars memory and factory defaults will be restored, including the car thinking the HV battery has an OK charge. This can often get you a couple more tries at starting.

 

And both fuses in the 12 volt battery positive clamp.

If you miss the little 5 amp fuse there, a trouble code for the DC/DC converter will be reported, which some people will interpret as needing to sell you a whole new inverter.

 

Start it up and let it idle for 30 minutes to allow the hybrid battery to fully charge. Listen to the engine. Record a video with your phone. Post it here with any problems.. Within Dr Prius you can hit the clear codes button and the scan for codes button after. Did any codes pop up? post your results here. The POA80 code is the hybrid battery. Letting it idle for 30 min should fully charge the hybrid battery to a much better level. Check the oil and coolant levels in both coolant reservoirs FIRST. Then after you do that your SOC indicator on the main screen should be in the blue bars....you can then disconnect the 12v battery for 5 minutes and the codes should clear. Then start it again and scan for codes. If there are none you should have no warning lights.

 

Codes from the engine control module normally light the check engine light. Codes from the HV control ECU (like P0A80) normally light the red triangle, but some of them will light the check engine as well. There's a table in the repair manual that says which ones do. I don't have that open right now so I'm not sure if P0A80 is one of them, but it could well be.

Toyota Service Information and Where To Find It | PriusChat

The brake system can set trouble codes just because of codes in the HV control ECU. If that code is C1259 (or if the yellow circle blinks 5 8 when you do this: Blink (a/k/a Flash) Codes – How to. | PriusChat) then that's all that is.

 

A P0A80 will turn on the MIL (check engine light), but last time I checked, there were no actual codes in the ECM.

I assume that Toyota engineers decided that a dying HV battery would result in higher than acceptable tailpipe emissions.

Posted via the PriusChat mobile app.

 

The repair manual is a much better source.

Toyota Service Information and Where To Find It | PriusChat