HV Battery wrong voltages on Torque

No, not likely.

Test those 4 modules under load, or charge them all (all 28 modules) up to 8.5 V and then let them sit for a week. Good modules should be around the same voltage at the end of a week. Poor performing modules will be significantly lower than the rest.

 

If you place your battery so the sensor harness is toward you, the sensor tab #1 on the far left is connected to the (-) end of the battery. That is your zero/ground reference. The next tab (#2 sensor tab) should measure the combined voltage of Module 1 + Module 2 voltages. That's the block 1 voltage. It's showing 2 volts. There is something wrong with that measurement circuit. Block 2 displayed voltage is going to be the difference between Sensor tab #3 and Sensor tab #2. That's showing 25.5 volts, which is impossible for only 2 modules (#3 + #4).

The fault lies in Block 1 sensing circuit. If it's not the sensing harness, then it's the plug socket or ecu itself. Assuming it's not the phone app doing something weird.

Also curious, what was the actual DTC triggered? P0A80? P0A1F?

 

Doesn't it look as though the wiring harness has been connected incorrectly
You either have residual voltage or twice the voltage

 

Read for trouble codes first!

 

Use the "Edit" button on the bottom left of your post to fix your typo.

 

Note: P1116 is not a HV battery fault. It is to do with the Coolant Heat Storage (CHS) tank at the front left of the engine bay.

You should check your work.

Some info:

P0AC0 | Hybrid Battery Pack Current Sensor Circuit Range/Performance

DESCRIPTION

The battery current sensor, which is mounted on the negative cable side of the HV battery assembly, detects the amperage that flows into the HV battery. The battery current sensor inputs a voltage (which varies between 0 to 5 V in proportion to the amperage) into the IB terminal of the battery ECU. An output voltage of the battery current sensor below 2.5 V indicates that the HV battery assembly is being charged, and above 2.5 V indicates that the HV battery assembly is being discharged.

The battery ECU determines the charging and discharging amperage of the HV battery assembly based on the signals that are input to its IB terminal, and calculates the SOC (state of charge) of the HV battery through the estimation of the amperage.

P0AFA | Hybrid Battery System Voltage Low

	DTC No.	DTC Detection Condition	Trouble Area
1	P0AFA	Either of the following conditions occurs (1 trip detection logic) Voltage at each battery block is below 2 V Voltage of all the battery blocks is -24 to 2 V	Junction block assembly (busbar module) No. 2 frame wire (busbar and wire harness) Battery ECU

MONITOR DESCRIPTION

The battery ECU monitors a voltage of the battery blocks to detect an open malfunction in internal battery voltage sensor circuits of the battery ECU and the wire harness between each battery block and battery ECU. If a voltage at one of the battery blocks is below a standard level or of all the battery blocks is within a specified range, the battery ECU judges that there is an open in the internal sensor circuit(s) or wire harness. The battery ECU then illuminates the MIL and sets a DTC.

Hope that helps.

 

It is P0AC0 not POACO. (Zeroes, not o's)

 

I don't know about this. I'm not a fan of leaving anything on ecu pins, especially ones that have significantly different voltages on them. Remember that first tab/wire/pin will be a ground reference. The last tab/wire/pin is going to be full battery voltage greater than the first one. Every battery I build gets a new wire frame #2 and the ecu gets cleaned and inspected. But they go together dry.

 

Here is the workup for DTC P0AFA : https://attachments.priuschat.com/attachment-files/2019/02/161942_2006_Prius_RM_-_DTC_P0AFA_Inspect_Proc.pdf