HYBRID BATTERY SYSTEM, Diagnostic DTC:P0A9D-123, P0A9E-123, P0AC7-123, P0AC8-123, P0ACC-123, P0ACD-123

DTC Code	DTC Name
P0A9D-123	Hybrid Battery Temperature Sensor "A" Circuit Low
P0A9E-123	Hybrid Battery Temperature Sensor "A" Circuit High
P0AC7-123	Hybrid Battery Temperature Sensor "B" Circuit Low
P0AC8-123	Hybrid Battery Temperature Sensor "B" Circuit High
P0ACC-123	Hybrid Battery Temperature Sensor "C" Circuit Low
P0ACD-123	Hybrid Battery Temperature Sensor "C" Circuit High

DESCRIPTION

The battery temperature sensors are provided at 3 locations of the HV battery. The resistance of the thermistor, which is built into each battery temperature sensor, varies in accordance with changes in the HV battery temperature. The lower the battery temperature, the higher the thermistor resistance. Conversely, the higher the temperature, the lower the resistance. The battery voltage sensor uses the battery temperature sensors to detect the HV battery temperature, and sends the detected value to the power management control ECU. Based on the results of this detection, the power management control ECU controls the blower fan. (The blower fan starts when HV battery temperature rises above a predetermined level.)

Temperature Sensor Identification Cross Reference Table

DTC Title Sensor	Battery Temperature Sensor	GTS Display
A	0	1
B	1	2
C	2	3

Tech Tips

For example, sensor A in the DTC title column is battery temperature sensor (No. 0). This sensor is displayed as Temp of Batt TB1 in the Data List.

DTC No.	DTC Detection Condition	Trouble Area
P0A9D-123	The battery temperature sensor is malfunctioning, its output voltage is lower than the specified value (short circuit) and the detected temperature is higher than the specified value. (1 trip detection logic)	HV battery Battery voltage sensor Harness or connector
P0A9E-123	The battery temperature sensor is malfunctioning, its output voltage is higher than the specified value (short to +B or open) and the detected temperature is lower than the specified value. (1 trip detection logic)	HV battery Battery voltage sensor Harness or connector
P0AC7-123	The battery temperature sensor is malfunctioning, its output voltage is lower than the specified value (short circuit) and the detected temperature is higher than the specified value. (1 trip detection logic)	HV battery Battery voltage sensor Harness or connector
P0AC8-123	The battery temperature sensor is malfunctioning, its output voltage is higher than the specified value (short to +B or open) and the detected temperature is lower than the specified value. (1 trip detection logic)	HV battery Battery voltage sensor Harness or connector
P0ACC-123	The battery temperature sensor is malfunctioning, its output voltage is lower than the specified value (short circuit) and the detected temperature is higher than the specified value. (1 trip detection logic)	HV battery Battery voltage sensor Harness or connector
P0ACD-123	The battery temperature sensor is malfunctioning, its output voltage is higher than the specified value (short to +B or open) and the detected temperature is lower than the specified value. (1 trip detection logic)	HV battery Battery voltage sensor Harness or connector

Tech Tips

After confirming that a DTC is output, use the GTS to check "Temp of BATT TB 1 to 5" in the hybrid vehicle control system ECU Data List.

Temperature Displayed	Malfunction
Below -45°C (-49°F)	Open or +B short circuit
95°C (203°F) or more	GND short circuit

Related Data List
DTC No.	Data List
P0A9D-123 P0A9E-123 P0AC7-123 P0AC8-123 P0ACC-123 P0ACD-123	Temp of Batt TB1 to TB3

WIRING DIAGRAM

Refer to the wiring diagram for DTC P0A9C-123 Click here.

INSPECTION PROCEDURE

CAUTION:

Before inspecting the high-voltage system, take safety precautions to prevent electrical shocks, such as wearing insulated gloves and removing the service plug grip. 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

At least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.
When disposing of an HV battery, make sure to return it through an authorized collection agent who is capable of handling it safely. If the HV battery is returned via the manufacturer specified route, it will be returned properly and in a safe manner by an authorized collection agent.

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.

Tech Tips

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.

Turn the power switch on (IG) and wait for 10 seconds or more.

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.

Read output DTCs.

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

Turn the power switch off.

GO TO DTC CHART (P0AFC-123) Click here

READ VALUE USING GTS (Temp of Batt)

Connect the GTS to the DLC3.
Turn the power switch on (IG).

Enter the following menus: Powertrain / Hybrid Control / Data List

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Temp of Batt TB1	Battery module temperature/ Min.: -75.0°C (-103°F), Max.: 155°C (311°F)	Undisturbed for 1 day: Same as ambient air temperature	Battery temperature sensor Battery voltage sensor
Temp of Batt TB2	Battery module temperature/ Min.: -75.0°C (-103°F), Max.: 155°C (311°F)	Undisturbed for 1 day: Same as ambient air temperature	Battery temperature sensor Battery voltage sensor
Temp of Batt TB3	Battery module temperature/ Min.: -75.0°C (-103°F), Max.: 155°C (311°F)	Undisturbed for 1 day: Same as ambient air temperature	Battery temperature sensor Battery voltage sensor

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Temp of Batt TB1

Battery module temperature/

Min.: -75.0°C (-103°F), Max.: 155°C (311°F)

Undisturbed for 1 day:

Same as ambient air temperature

Battery temperature sensor
Battery voltage sensor

Temp of Batt TB2

Battery module temperature/

Min.: -75.0°C (-103°F), Max.: 155°C (311°F)

Undisturbed for 1 day:

Same as ambient air temperature

Battery temperature sensor
Battery voltage sensor

Temp of Batt TB3

Battery module temperature/

Min.: -75.0°C (-103°F), Max.: 155°C (311°F)

Undisturbed for 1 day:

Same as ambient air temperature

Battery temperature sensor
Battery voltage sensor

Tech Tips

A malfunctioning sensor (battery temperature sensor 0, 1 or 2) can be determined by comparing the output temperature of the 3 battery temperature sensors.

Turn the power switch off.

CHECK CONNECTOR CONNECTION CONDITION (BATTERY TEMPERATURE SENSOR)
CAUTION:

Be sure to wear insulated gloves.
1. 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.
2. Remove the upper hybrid battery cover sub-assembly Click here.
3. Check the connections of the z21 connector of the battery voltage sensor Click here.
  
  OK
  
  The connectors are connected securely and there are no contact problems.
4. Install the upper hybrid battery cover sub-assembly.
NG
CONNECT SECURELY

OK

OK
The connectors are connected securely and there are no contact problems.

CHECK HV BATTERY (BATTERY TEMPERATURE SENSOR)

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 upper hybrid battery cover sub-assembly Click here.
Disconnect the z21 battery voltage sensor connectors.

Text in Illustration
*a	Rear view of wire harness connector (to Battery Voltage Sensor)

Measure the resistance of the circuit for the malfunctioning sensor.

Tester Connection

Tester Connection	Battery Temperature Sensor No.
z21-4 (TB0) - z21-10 (GB0)	0
z21-3 (TB1) - z21-9 (GB1)	1
z21-2 (TB2) - z21-8 (GB2)	2

Standard Resistance

Thermistor Temperature	Switch Condition	Specified Condition
0°C (32°F)	Power switch off	26.7 to 27.8 kΩ
25°C (77°F)	Power switch off	9.9 to 10.1 kΩ
40°C (104°F)	Power switch off	5.73 to 5.92 kΩ

Disconnect the m5 battery voltage sensor connectors.

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

Text in Illustration
*a	Rear view of wire harness connector (to Battery Voltage Sensor)	-	-

Standard Resistance

Tester Connection	Switch Condition	Standard Resistance
z21-4 (TB0) - m5-3 (IGCT)	Power switch off	10 kΩ or higher
z21-4 (TB0) - m5-6 (GND)	Power switch off	10 kΩ or higher
z21-10 (GB0) - m5-3(IGCT)	Power switch off	10 kΩ or higher
z21-10 (GB0) - m5-6 (GND)	Power switch off	10 kΩ or higher
z21-3 (TB1) - m5-3 (IGCT)	Power switch off	10 kΩ or higher
z21-3 (TB1) - m5-6 (GND)	Power switch off	10 kΩ or higher
z21-9 (GB1) - m5-3 (IGCT)	Power switch off	10 kΩ or higher
z21-9 (GB1) - m5-6 (GND)	Power switch off	10 kΩ or higher
z21-2 (TB2) - m5-3 (IGCT)	Power switch off	10 kΩ or higher
z21-2 (TB2) - m5-6 (GND)	Power switch off	10 kΩ or higher
z21-8 (GB2) - m5-3 (IGCT)	Power switch off	10 kΩ or higher
z21-8 (GB2) - m5-6 (GND)	Power switch off	10 kΩ or higher
z21-1 (TC0) - m5-3 (IGCT)	Power switch off	10 kΩ or higher
z21-1 (TC0) - m5-6 (GND)	Power switch off	10 kΩ or higher
z21-7 (GC0) - m5-3 (IGCT)	Power switch off	10 kΩ or higher
z21-7 (GC0) - m5-6 (GND)	Power switch off	10 kΩ or higher

Reconnect the z21 and m5 battery voltage sensor connectors.
Install the upper hybrid battery cover sub-assembly.

Click here

REPLACE BATTERY VOLTAGE SENSOR Click here

CHECK HARNESS AND CONNECTOR (BATTERY TEMPERATURE SENSOR)

CAUTION:

Be sure to wear insulated gloves and protective goggles.

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 upper hybrid battery cover sub-assembly Click here.

Check the wire harness and connectors of the battery temperature sensor for abnormalities by sight and touch.

Specified Condition
There are no open or short circuits in the wire harness and connectors. There are no short circuits to other wire harnesses.

Tech Tips

Because the battery harness is not available as a supply part, if the harness cannot be repaired, replace the HV battery.

Install the upper hybrid battery cover sub-assembly.

REPLACE HARNESS OR CONNECTOR (BATTERY TEMPERATURE SENSOR)

REPLACE HV BATTERY Click here