HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for AWD with NICKEL METAL HYDRIDE BATTERY): P0A9B11,...,P0ACA15; Hybrid/EV Battery Temperature Sensor "A" Circuit Short to Ground; 2019 - 2024 MY RAV4 HV [02/2019

The battery temperature sensors are provided at 3 locations 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 voltage sensor uses the battery temperature sensors to detect the HV battery temperature, and sends the detected value to the hybrid vehicle control ECU assembly. Based on the results of this detection, the hybrid vehicle control ECU assembly controls the blower fan. (The blower fan starts when the HV battery temperature rises above a predetermined level.)

Use the reference table above to determine which battery temperature sensor each DTC corresponds to. For example, sensor A in the DTC title column is battery temperature sensor 0. This sensor is displayed as Hybrid Battery Temperature 1 in the Data List.

Related Data List

HINT:

After checking for the above DTCs, check the hybrid system Data List item "Hybrid Battery Temperature" using the Techstream.

Temperature Displayed	Malfunction
Below -45°C (-49°F)	Open or +B short circuit
95°C (203°F) or more	GND short circuit

If the vehicle is left as is for 24 hours, the value of "Hybrid Battery Temperature" will be almost the same as the ambient temperature.

MONITOR DESCRIPTION

If a malfunction in the HV battery temperature sensor was detected, the hybrid vehicle control ECU assembly will illuminate the MIL and store a DTC.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

CONFIRMATION DRIVING PATTERN

HINT:

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
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When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
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Connect the Techstream to the DLC3.
Turn the ignition switch to ON and turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for 2 minutes or more.
Turn the ignition switch to ON and turn the Techstream on.
With ignition switch ON and wait for 5 seconds or more. [*1]
HINT:

[*1]: Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
Check the DTC judgment result.
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE, perform the normal judgment procedure again.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION:

Before the following operations are conducted, take precautions to prevent electric shock by turning the ignition switch off, wearing insulated gloves, and removing the service plug grip from HV battery.
- Inspecting the high-voltage system
- Disconnecting the low voltage connector of the inverter with converter assembly
- Disconnecting the low voltage connector of the HV battery
To prevent electric shock, make sure to remove the service plug grip to cut off the high voltage circuit before servicing the vehicle.
After removing the service plug grip from the HV battery, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.

After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.

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HINT:

Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

*a	Without waiting for 10 minutes

After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

PROCEDURE

Powertrain > Hybrid Control > Trouble Codes

Powertrain > Hybrid Control > Data List

A malfunctioning sensor (battery temperature sensor 0, 1 or 2) can be determined by comparing the output temperature of the 3 battery temperature sensors.

After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.

There are no open or short circuits in the wire harness and connectors. There are no short circuits to other wire harnesses.