P0AC7

HYBRID / BATTERY CONTROL: HYBRID BATTERY SYSTEM: P0A9D-123,P0A9E-123,P0AC7-123,P0AC8-123,P0ACC-123,P0ACD-123,P0AEA-123,P0AEB-123: Hybrid Battery Temperature Sensor "A" Circuit Low
P0AEB-123 - Hybrid Battery Temperature Sensor "D" Circuit High

DESCRIPTION

- 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 sensor to detect the HV battery temperature, and sends the detected value to the hybrid vehicle control ECU. Based on the results of this detection, the hybrid vehicle 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:





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





HINT
After confirming that a DTC is output, use the Techstream to check "Temp of Batt TB 1 to 4" in the hybrid vehicle control system ECU data list.





MONITOR DESCRIPTION

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 HV battery temperature is out of the normal range or its value is abnormal, the hybrid vehicle control ECU will illuminate the MIL and set 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 accidentally reconnecting it while you are working on the high-voltage system.
- After disconnecting the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals.
HINT
At least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

PROCEDURE

1. CHECK DTC OUTPUT (DTC P0A1F-123 IS OUTPUT) P0A7F

B -- GO TO DTC CHART P0A1F
A -- Continue to next step.

2. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Enter the following menus: Powertrain / Hybrid Control / Data List / Temp of Batt TB 1 to 4.

HINT
Compare the temperature of the 4 battery temperature sensors to determine the sensor with the malfunction (Temp of Batt TB1 to TB4).

NEXT -- Continue to next step.

3. CHECK CONNECTOR CONNECTION CONDITION (BATTERY TEMPERATURE SENSOR)

CAUTION:
Be sure to wear insulated gloves.

(a) Disconnect the cable from the negative (-) battery terminal.

(b) Check that the service plug grip is not installed.

NOTICE:
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.

(c) Remove the hybrid battery junction block assembly Removal.

(d) Check the connections of the z37 connector of the battery smart unit.





OK:

The connector is connected securely and there are no contact problems.

(e) Install the hybrid battery junction block assembly Installation.

(f) Connect the cable to the negative (-) battery terminal.

NG -- CONNECT SECURELY
OK -- Continue to next step.

4. CHECK HV BATTERY ASSEMBLY (BATTERY TEMPERATURE SENSOR) P0A9C

NG -- CHECK HARNESS AND CONNECTOR (BATTERY TEMPERATURE SENSOR)

OK -- REPLACE BATTERY SMART UNIT Components

5. CHECK HARNESS AND CONNECTOR (BATTERY TEMPERATURE SENSOR) P0A9C

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE HV BATTERY ASSEMBLY Components