Get the vehicle ready to scan by get switching the vehicle on fully. You will see a ‘Ready’ light on the dash that will indicate that the vehicle is ready to drive. Process will not work if vehicle
is just IG ON.

Connect your desired scan tool into the OBD port and load into the vehicle. In most cases, select the ‘Hybrid Control’ ECU. Occasionally, such as a 2004-2009 Prius, the battery information may be in the ‘HV Battery’ ECU. Select the Hybrid Control unless HV Battery ECU is present.

Once in the ECU, go into the ‘data list’/live data function

We are looking for five data points

1. Batt Pack Current Val - Shows the current flow of the battery. Positive value indicates a DISCHARGE and negative value a CHARGE.
2. Batt Block Minimum Vol - The voltage of the minimum battery block in the HV battery.
3. Minimum Batt Block No - The battery block number associated with the minimum voltage.
4. Batt Block Max Vol - The voltage of the maximum block in the HV battery.
5. Max Batt Block No - The battery block number associated with the maximum voltage.

Can’t see them? Check to see if there is a data filter applied.

Ensure that the battery is reasonably charged. Values that are at the top end of the voltage range. Example vehicle shown in the photos is a 2011 Toyota Camry which has an operating voltage range of 14.5-16.5 volts per module block (module pair). Note you may see voltages outside of this range, this is merely the range the battery usually operates in.

Check the following table as reference. DO NOT DISCHARGE OUTSIDE OF OPERATING VOLTAGE RANGE. If your vehicle does not appear, please consult Infinitev (1300 360 111 (AU) | 0800 360 111 (NZ).

Sit in the vehicle and put foot onto brake and ensure park brake is on. Put the vehicle into neutral. This will ensure that the vehicle will be unable to charge the HV battery. DO NOT LEAVE THE VEHICLE UNATTENDED.

Set to lowest temperature and fans to highest setting to ensure best results. The idea here is to get the battery to start working hard so we can see how it performs under load.

You should now see that the ‘Batt Pack Current Val’ has increased. We are targeting over a 5 amp draw; ideally, we want amp load between a 7-9.

The HV battery is now discharging. We are looking at the following values:

• The difference between the minimum and maximum block voltage. You can see in the example that the vehicle started off with a minimum voltage of 15.73V and a maximum voltage of 15.85V. This is a difference of 0.12V and is very good. As the battery discharges, this difference will start to increase if there are any weak blocks.
• We also want to monitor the 'Minimum Batt Block No' to determine if the number is constantly changing or remains the same. If it remains the same, this indicates that the battery may have a weak block in it. If the number is always changing, it suggests there is no weak block in the pack.

Allow the battery to discharge to the lowest value in the operating voltage range. In the case of the example vehicle, this is 14.5V. At the low end of the operating voltage range, it is normal to see a larger voltage difference between the maximum and minimum voltage. Here's what the maximum voltage difference means in terms of battery condition:

• Below 0.2V = As new battery
• Between 0.2-0.3V = Healthy battery
• Between 0.3-0.4V = Okay battery
• Between 0.4-0.5V = Emerging failure
• Between 0.5-0.8V = Battery close to failure
• Above 0.8V = Battery has failed

As soon as the test has been completed, put the vehicle into park and allow the vehicle to charge the HV battery.