P0A9E
P0A9D-123, P0A9E-123Description
The battery temperature sensors are provided at 4 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 sensors to detect the HV battery temperature, and sends the detected values to the hybrid vehicle control ECU. Based on these results, the hybrid vehicle control ECU controls the blower fan. (The blower fan starts when the HV battery temperature rises above a predetermined level.)
DTC Logic
DTC Detection Logic
If the temperature indicated by the battery temperature sensor is lower than the standard level (open), or is higher than the standard level (short), the battery smart unit interprets this as a sensor malfunction. If the battery smart unit detects that the HV battery temperature is out of its normal range or its value is abnormal, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.
NOTE: After confirming that a DTC is output, check "BATT TEMP 1 to 4" in "DATA MONITOR" mode with CONSULT-III.
Diagnostic Procedure
Step 1-4:
Step 4 (Continued)-5:
