HYBRID CONTROL SYSTEM, Diagnostic DTC:P0AC0-817

DTC Code	DTC Name
P0AC0-817	Hybrid Battery Pack Current Sensor Circuit Range / Performance

DESCRIPTION

A battery current sensor, which is mounted on the positive cable side of each hybrid battery junction block assembly, detects the current flowing to or from the battery pack. The battery current sensor sends a voltage, which varies between 0 and 5 V in proportion to the amperage, to the IB0 terminal of the battery smart unit. Similarly, it sends a voltage, which varies between 0 and 5 V in inverse proportion to the amperage, into the IB1 terminal of the battery smart unit. When the voltage of the IB0 terminal is below 2.8 V and the voltage of the IB1 terminal is above 2.2 V, this indicates that the HV battery is being charged. Meanwhile, when the voltage of the IB0 terminal is above 2.8 V and the voltage of the IB1 terminal is below 2.2 V, this indicates that the HV battery is being discharged. The battery smart unit sends the signals from its IB0 and IB1 terminals to the power management control ECU (HV battery CPU). The power management control ECU (HV battery related portion) determines the charging and discharging amperage of the HV battery based on the received signals and calculates the SOC of the HV battery using the cumulative amperage value.

DTC No.	INF Code	DTC Detection Condition	Trouble Area
P0AC0	817	HV battery current sensor performance problem	Hybrid battery junction block assembly Battery smart unit Wire harness or connector HV battery

INSPECTION PROCEDURE

CAUTION:

Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly or electric vehicle charger assembly, turn the power switch off. Also, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work Click here.

Tech Tips

Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly and electric vehicle charger assembly.

Note

After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Click here.

PROCEDURE

CHECK DTC OUTPUT (HYBRID CONTROL)

Connect the GTS to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

Check if DTCs are output.

Result

Result	Proceed to
P0AFC-123 is not output.	A
P0AFC-123 is output.	B

Turn the power switch off.

GO TO DTC CHART (P0AFC-123) Click here

CHECK HARNESS AND CONNECTOR (HYBRID BATTERY JUNCTION BLOCK ASSEMBLY - BATTERY SMART UNIT)

CAUTION:

Be sure to wear insulated gloves.

Check that the service plug grip is not installed.

Note

After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.
Remove the No. 1 hybrid battery intake duct Click here.
Remove the No. 1 hybrid vehicle battery shield panel Click here.
Disconnect only the c5 battery smart unit connector.
Disconnect the c6 battery current sensor connector from the hybrid battery junction block assembly.

Text in Illustration
*a	Rear view of wire harness connector (to Battery Smart Unit)
*b	Front view of wire harness connector (to Hybrid Battery Junction Block Assembly)

Measure the resistance according to the value(s) in the tables below.

Standard Resistance (Check for Open)

Tester Connection	Condition	Specified Condition
c5-7 (IB1) - c6- 2 (IB1)	Power switch off	Below 1 Ω
c5-8 (GIB) - c6- 3 (GIB)	Power switch off	Below 1 Ω
c5-1 (IB0) - c6- 4 (IB0)	Power switch off	Below 1 Ω
c5-2 (VIB) - c6- 1 (VIB)	Power switch off	Below 1 Ω

Standard Resistance (Check for Short)

Tester Connection	Condition	Specified Condition
c5-7 (IB1) or c6- 2 (IB1) - Body ground and other terminals	Power switch off	10 kΩ or higher
c5-8 (GIB) or c6- 3 (GIB) - Body ground and other terminals	Power switch off	10 kΩ or higher
c5-1 (IB0) or c6- 4 (IB0) - Body ground and other terminals	Power switch off	10 kΩ or higher
c5-2 (VIB) or c6- 1 (VIB) - Body ground and other terminals	Power switch off	10 kΩ or higher

Reconnect the c5 battery smart unit connector.
Reconnect the c6 battery current sensor connector to the hybrid battery junction block assembly.
Install the No. 1 hybrid battery intake duct.
Install the No. 1 hybrid vehicle battery shield panel.

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK BATTERY SMART UNIT (VIB VOLTAGE)

CAUTION:

Be sure to wear insulated gloves.

Check that the service plug grip is not installed.

Note

After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.
Remove the No. 1 hybrid vehicle battery shield panel Click here.
Remove the No. 1 hybrid battery intake duct Click here.
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the power switch on (IG).

Text in Illustration
*a	Component with harness connected (Battery Smart Unit)

Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection	Condition	Specified Condition
c5-2 (VIB) - c5-8 (GIB)	Power switch on (IG)	4.6 to 5.4 V

Note

Turning the power switch on (IG) with the service grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
Install the No. 1 hybrid battery intake duct.
Install the No. 1 hybrid vehicle battery shield panel.

REPLACE BATTERY SMART UNIT Click here

CHECK BATTERY SMART UNIT

CAUTION:

Be sure to wear insulated gloves.

Check that the service plug grip is not installed.

Note

After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.
Remove the No. 1 hybrid vehicle battery shield panel Click here.
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the power switch on (IG).

Text in Illustration
*a	Component with harness connected (Battery Smart Unit)

Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection	Condition	Specified Condition
c5-7 (IB1) - c5-8 (GIB)	Power switch on (IG)	2.16 to 2.24 V
c5-1 (IB0) - c5-8 (GIB)	Power switch on (IG)	2.76 to 2.84 V

Note

Turning the power switch on (IG) with the service grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
Install the No. 1 hybrid vehicle battery shield panel.

REPLACE HYBRID BATTERY JUNCTION BLOCK ASSEMBLY Click here

CLEAR DTC
1. Connect the GTS to the DLC3.
2. Turn the power switch on (IG).
3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
4. Read and record the DTCs and freeze frame data.
5. Clear DTCs and freeze frame data.
6. Turn the power switch off.
NEXT
PERFORM ROAD TEST
1. Connect the GTS to the DLC3.
2. Turn the power switch on (IG).
3. Enter the following menus: Powertrain / Hybrid Control / ECU Data List / State of Charge (All Bat).
4. Check that "State of Charge (All Bat)" shows 60% or less.
  
  Tech Tips
  
  If "State of Charge (All Bat)" is 60% or more, reduce it to below 60% by leaving the hybrid system on with neutral (N) selected.
5. Apply the parking brake and secure the wheels using chocks.
6. Turn the power switch on (READY).
7. Move the shift lever to D while depressing the brake pedal with your left foot and repeat the following steps for 1 minute or more.
  
  Tech Tips
  
  Depress and release the accelerator pedal in 5-second intervals (2.5 seconds each) continuously.
  1. While depressing the brake pedal with your left foot, depress the accelerator pedal with your right foot.
  2. Release the accelerator pedal.
8. Turn the power switch off.
NEXT

CHECK DTC OUTPUT (HYBRID CONTROL)

Connect the GTS to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

Check if DTCs are output.

Result

Result	Proceed to
P0AC0-817 is not output.	A
P0AC0-817 is output again.	B

Turn the power switch off.

REPLACE BATTERY SMART UNIT Click here

COMPLETED