P0A9C

P310 HYBRID BATTERY CONTROL: HYBRID BATTERY SYSTEM: P0A9C: Hybrid Battery Temperature Sensor "A"

DTC P0A9C - Hybrid Battery Temperature Sensor "A"

DTC P0AC5 - Hybrid Battery Temperature Sensor "B" Circuit

DTC P0ACA - Hybrid Battery Temperature Sensor "C"

DESCRIPTION

The battery temperature sensors are provided at 8 locations on the bottom 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 smart unit uses the battery temperature sensor to detect the HV battery temperature, and sends the detected value to the HV control ECU. Based on the results of this detection, the HV control ECU controls the blower fan. (The blower fan starts when HV battery temperature rises to a predetermined level.)













HINT: After confirming that a DTC is output, use Techstream to check "Temp of Batt TB1 to 8" in the HV system ECU data list.





MONITOR DESCRIPTION

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

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





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 working on 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 is required to discharge the high-voltage capacitor inside the w/ converter inverter assembly.

PROCEDURE

1. CHECK DTC OUTPUT (DTC P0A1F IS OUTPUT)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
(d) Read output DTCs Hybrid Battery System.
Result:






B -- GO TO DTC CHART (P0A1F)
A -- Continue to next step.
2. CHECK HV BATTERY (BATTERY TEMPERATURE SENSOR)
CAUTION: Be sure to wear insulated gloves and protective goggles.





(a) Disconnect the B31 and B32connectors from the battery smart unit.
HINT: For the removal and installation procedures related to the battery smart unit connector inspection, Components.
(b) Measure the resistance according to the conditions and value(s) in the tables below.






Standard Resistance:






NG -- REPLACE HV BATTERY
OK -- Continue to next step.
3. CHECK INSTALLATION OF BATTERY TEMPERATURE SENSOR
CAUTION: Be sure to wear insulated gloves and protective goggles.
(a) Remove the HV battery with the relevant battery temperature sensor.
HINT: For the removal and installation procedures related to the HV battery, Components





(b) Turn over the relevant HV battery and check the installation of the battery temperature sensor.
Result:





HINT: Do not leave the HV battery 10 minutes or more after turning the battery over.

C -- INSTALL SECURELY
B -- REPLACE HV BATTERY
A -- REPLACE BATTERY SMART UNIT