P0A9E

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 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.)









HINT
After confirming that a DTC is output, use the Techstream to check "Temp of Batt 1 to 4" in the HV 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 a 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





Refer to the wiring diagram for DTC P0A1F-123 P0A1F and DTC P0AFA-123 P0AAE.

INSPECTION PROCEDURE

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

(a) Connect the Techstream to the DLC3.

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

(c) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.

(d) Check if DTCs are output.

Result:

DTC P0A1F-123 is output.

YES -- GO TO INSPECTION PROCEDURE RELEVANT TO OUTPUT DTC
NO -- Continue to next step.

2. READ VALUE USING TECHSTREAM

(a) Select the following menu items: Powertrain / Hybrid Control / Data List / Temp of Batt 1 to 4.

(b) Read the data list.

HINT
Determine which battery temperature sensor (0 to 3) is malfunctioning. Sensor 1, as referred to on the Techstream, refers to sensor 0 (TB0) on the vehicle. The other battery temperature sensors are numbered in the same manner.

NEXT -- Continue to next step.

3. CHECK CONNECTOR CONNECTION CONDITION (BATTERY TEMPERATURE SENSOR)

CAUTION:
Be sure to wear insulated gloves.

(a) Remove the service plug grip. Removal

(b) Remove the luggage compartment trim cover front. Removal

(c) Disconnect the frame wire. Removal

(d) Remove the battery bracket sub-assembly. Removal

(e) Check the connection of connector z13 of the battery smart unit.





OK:

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

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

4. CHECK HV BATTERY (BATTERY TEMPERATURE SENSOR)

CAUTION:
Be sure to wear insulated gloves.

(a) Disconnect connector z13 from the battery smart unit.

(b) For the malfunctioning battery temperature sensor(s) , measure the resistance according to the value(s) in the table below.





Thermistor No.:





Standard resistance:





(c) Disconnect connector N2 from the battery smart unit.

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





Standard resistance (Check for short):





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





Standard resistance (Check for short):





NG -- REPLACE HV BATTERY Components

OK -- REPLACE BATTERY SMART UNIT Components