Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001GCMY
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 09/2022]
Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): P0AAC11,P0AAC15; Hybrid/EV Battery Air Temperature Sensor "A" Circuit Short to Ground; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]

DTC

P0AAC11

Hybrid/EV Battery Air Temperature Sensor "A" Circuit Short to Ground

DTC

P0AAC15

Hybrid/EV Battery Air Temperature Sensor "A" Circuit Short to Auxiliary Battery or Open

DESCRIPTION

The inlet air temperature sensor (battery) is mounted on the HV battery. The resistance of the sensor varies in accordance with changes in the intake air temperature. The characteristics of the inlet air temperature sensor are the same as those of the battery temperature sensors (Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): P0A9B11,...,P0ACA15; Hybrid/EV Battery Temperature Sensor "A" Circuit Short to Ground+ ). The battery voltage sensor uses signals from the inlet air temperature sensor to control the air volume of the battery cooling blower assembly.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P0AAC11

Hybrid/EV Battery Air Temperature Sensor "A" Circuit Short to Ground

The inlet air temperature sensor output voltage is lower than the specified value (short circuit) and the detected temperature is higher than the specified value.

(1 trip detection logic)
  • Hybrid battery thermistor (inlet air temperature sensor)
  • Battery voltage sensor
  • Wire harness or connector

Does not come on

Master Warning: Comes on

P0AAC15

Hybrid/EV Battery Air Temperature Sensor "A" Circuit Short to Auxiliary Battery or Open

The inlet air temperature sensor output voltage is higher than the standard value (short to +B or open) and the detected temperature is lower than the specified value.

(1 trip detection logic)
  • Hybrid battery thermistor (inlet air temperature sensor)
  • Battery voltage sensor
  • Wire harness or connector

Does not come on

Master Warning: Comes on

HINT:

After checking for the above DTCs, check the hybrid system Data List item "Hybrid/EV Battery Cooling Fan Intake Air Temperature 1" using the Techstream.

Displayed Temperature

Malfunction

-45°C (-49°F) or less

Open or +B short circuit

95°C (203°F) or more

GND short

Related Data List

DTC No.

Data List

P0AAC11

Hybrid/EV Battery Cooling Fan Intake Air Temperature 1

P0AAC15

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.

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): UTILITY

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG) and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the power switch off and wait for 2 minutes or more.
  5. Turn the power switch on (IG) and turn the Techstream on.
  6. With power switch on (IG) and wait for 5 seconds or more.
  7. Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
  8. 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 or N/A, perform driving pattern again.

WIRING DIAGRAM

Refer to the wiring diagram for DTC P0A9B2A.

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): P0A9B2A,P0AC52A,P0ACA2A,P306562; Hybrid/EV Battery Temperature Sensor "A" Signal Stuck In Range+

CAUTION / NOTICE / HINT

CAUTION:

  • Before the following operations are conducted, take precautions to prevent electric shock by turning the power 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.

    Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): PRECAUTION

    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

NOTICE:

After turning the power 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.

Click here 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2019]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2019 - 04/2020]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2021 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [04/2020 - 09/2022]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION

PROCEDURE

1.

CHECK DTC OUTPUT (HYBRID CONTROL)

(a) Connect the Techstream to the DLC3.

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

(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

(d) Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes

Result

Proceed to

P0AFC00, P0AFC96 or P308A12 is not output.

A

P0AFC00, P0AFC96 or P308A12 is output.

B

(e) Turn the power switch off.

B

GO TO DTC CHART (HYBRID CONTROL SYSTEM) 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): DIAGNOSTIC TROUBLE CODE CHART 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): DIAGNOSTIC TROUBLE CODE CHART

A

2.

CHECK CONNECTOR CONNECTION CONDITION (BATTERY VOLTAGE SENSOR CONNECTION CONDITION)

CAUTION:

Be sure to wear insulated gloves.

(a) 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.

(b) Remove the No. 1 hybrid battery exhaust duct.

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HV BATTERY (for NICKEL METAL HYDRIDE BATTERY): REMOVAL+

(c) Check the connections of the z10 battery voltage sensor connector.

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: ELECTRONIC CIRCUIT INSPECTION PROCEDURE

OK:

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

Result:

Proceed to

OK

NG

(d) Install the No. 1 hybrid battery exhaust duct.

NG

CONNECT SECURELY
OK

3.

CHECK INSTALLATION OF INLET AIR TEMPERATURE SENSOR

CAUTION:

Be sure to wear insulated gloves and protective goggles.

(a) 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.

(b) Remove the HV battery junction block assembly.

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HV RELAY ASSEMBLY (for NICKEL METAL HYDRIDE BATTERY): REMOVAL+

(c) Visually check the installation condition of the inlet air temperature sensor.

Result:

Result

Proceed to

The inlet air temperature sensor is installed in the correct location and its claws are engaged securely.

A

The claws of the inlet air temperature sensor are damaged.

B

The inlet air temperature sensor is not installed correctly, but its claws are not damaged.

C

(d) Install the HV battery junction block assembly.

B

REPLACE HYBRID BATTERY THERMISTOR

C

INSTALL PARTS CORRECTLY
A

4.

CHECK HYBRID BATTERY THERMISTOR (INLET AIR TEMPERATURE SENSOR)

CAUTION:

Be sure to wear insulated gloves.

(a) 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.

(b) Remove the No. 1 hybrid battery exhaust duct.

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HV BATTERY (for NICKEL METAL HYDRIDE BATTERY): REMOVAL+

(c) Disconnect the z10 battery voltage sensor connector.

NOTICE:

Before disconnecting the connector, check that it is not loose or disconnected.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

z10-1 (TC0) - z10-7 (GC0)

Power switch off

0 to 10°C (32 to 50°F)

17.7 to 27.8 kΩ

Power switch off

10 to 20°C (50 to 68°F)

12.0 to 18.2 kΩ

Power switch off

20 to 30°C (68 to 86°F)

8.22 to 12.2 kΩ

Power switch off

30 to 40°C (86 to 104°F)

5.74 to 8.41 kΩ

Power switch off

40 to 50°C (104 to 122°F)

4.09 to 5.91 kΩ

NOTICE:

When taking a measurement with a tester, do not apply excessive force to the tester probe to avoid damaging the holder.

*a

Rear view of wire harness connector

(to Battery Voltage Sensor)

(e) Disconnect the O33 battery voltage sensor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

z10-1 (TC0) - O33-1 (IGCT)

Power switch off

10 kΩ or higher

z10-1 (TC0) - O33-5 (GND)

Power switch off

10 kΩ or higher

z10-7 (GC0) - O33-1 (IGCT)

Power switch off

10 kΩ or higher

z10-7 (GC0) - O33-5 (GND)

Power switch off

10 kΩ or higher

z10-4 (TB0) - O33-1 (IGCT)

Power switch off

10 kΩ or higher

z10-4 (TB0) - O33-5 (GND)

Power switch off

10 kΩ or higher

z10-10 (GB0) - O33-1 (IGCT)

Power switch off

10 kΩ or higher

z10-10 (GB0) - O33-5 (GND)

Power switch off

10 kΩ or higher

z10-3 (TB1) - O33-1 (IGCT)

Power switch off

10 kΩ or higher

z10-3 (TB1) - O33-5 (GND)

Power switch off

10 kΩ or higher

z10-9 (GB1) - O33-1 (IGCT)

Power switch off

10 kΩ or higher

z10-9 (GB1) - O33-5 (GND)

Power switch off

10 kΩ or higher

z10-2 (TB2) - O33-1 (IGCT)

Power switch off

10 kΩ or higher

z10-2 (TB2) - O33-5 (GND)

Power switch off

10 kΩ or higher

z10-8 (GB2) - O33-1 (IGCT)

Power switch off

10 kΩ or higher

z10-8 (GB2) - O33-5 (GND)

Power switch off

10 kΩ or higher

(g) Reconnect the z10 and O33 battery voltage sensor connectors.

(h) Install the No. 1 hybrid battery exhaust duct.

OK

REPLACE BATTERY VOLTAGE SENSOR

NG

5.

CHECK HARNESS AND CONNECTOR (BATTERY TEMPERATURE SENSOR AND INLET AIR TEMPERATURE SENSOR)

CAUTION:

Be sure to wear insulated gloves and protective goggles.

(a) 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.

(b) Remove the upper No. 1 hybrid battery cover sub-assembly.

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: BATTERY VOLTAGE SENSOR (for NICKEL METAL HYDRIDE BATTERY): REMOVAL+

(c) Check the wire harnesses and connectors of the battery temperature sensors and inlet air temperature sensor for abnormalities by sight and touch.

Specified Condition:

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

(d) Install the upper No. 1 hybrid battery cover sub-assembly.

OK

REPLACE HYBRID BATTERY THERMISTOR

NG

REPAIR HARNESS OR CONNECTOR (INLET AIR TEMPERATURE SENSOR)