P0A9C

P112 HYBRID BATTERY CONTROL: HYBRID BATTERY SYSTEM: P0A9C: Hybrid Battery Temperature Sensor "A"

DTC P0A9C - Hybrid Battery Temperature Sensor "A"

DTC P0A9D - Hybrid Battery Temperature Sensor "A" Circuit Low

DTC P0A9E - Hybrid Battery Temperature Sensor "A" Circuit High

DESCRIPTION





3 battery temperature sensors are located on the bottom of the HV battery assembly. The resistance of the thermistor, which is enclosed in each battery temperature sensor, changes in accordance with the changes in the temperature of the HV battery assembly. The lower the battery temperature, the higher the resistance of the thermistor. Conversely, the higher the temperature, the lower the resistance.
The battery ECU uses the battery temperature sensors to detect the temperature of the HV battery assembly. Based on the results of this detection, the battery ECU controls the battery blower. (Thus, the blower fan starts when the HV battery temperature rises to a predetermined level.)





HINT: After confirming DTC P0A9C, P0A9D and P0A9E, enter the following menus on the Techstream: Powertrain / HV Battery / Data List. Then, confirm the temperature of the HV battery by checking "Batt Temp 1 to 3".





MONITOR DESCRIPTION

If the temperature indicated by the battery temperature sensors is lower than the standard level (open), or is higher than the standard level (short), the battery ECU interprets this as a sensor malfunction. If the battery ECU detects that HV battery temperature is out of a normal range or its value is abnormal, it illuminates the MIL and sets a DTC.

MONITOR STRATEGY

Case 1: Battery temperature sensor malfunction





Case 2: Battery temperature sensor low resistance





Case 3: Battery temperature high resistance





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS

Case 1: Battery temperature sensor malfunction





Case 2: Battery temperature sensor low resistance





Case 3: Battery temperature high resistance





COMPONENT OPERATING RANGE





WIRING DIAGRAM





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 reconnecting it while you are servicing the high-voltage system.
- After disconnecting the service plug grip, wait for at least 5 minutes before touching any of the high-voltage connectors or terminals.
HINT: At least 5 minutes are required to discharge the high-voltage condenser inside the inverter.

PROCEDURE

1. READ DTC OUTPUT (DTC P0A1F IS OUTPUT)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch ON (IG) and the tester ON.
(c) Enter the following menus: Powertrain / HV Battery / DTC.
(d) Read DTCs.
Result:
DTC P0A1F is output
YES -- REPLACE BATTERY ECU
NO -- Continue to next step.

2. CHECK CONNECTION OF BATTERY TEMPERATURE SENSOR CONNECTOR
CAUTION: Wear insulated gloves before performing the following operation.
(a) Turn the power switch OFF.
(b) Remove the service plug grip Removal.
NOTE: Turning the power switch ON (READY) with the service plug grip removed could cause a malfunction. Therefore, never turn the power switch ON (READY) in this state.




(c) Check the connection condition of the B13 battery ECU connector.
OK:
Connector has been connected securely and there is no poor connection.
HINT: Since the battery temperature sensor is not available by itself, if replacement is required, replace the entire HV battery assembly.

NG -- CONNECT SECURELY
OK -- REPLACE HV SUPPLY BATTERY ASSEMBLY