Toyota Avalon (XX50): Drive Motor "A" Temperature Sensor Circuit Short to Ground (P0A2A11,P0A2A15)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Engine / Hybrid / Battery Control / Hybrid Control System / Drive Motor "A" Temperature Sensor Circuit Short to Ground (P0A2A11,P0A2A15)

DTC SUMMARY

MALFUNCTION DESCRIPTION

These DTCs are stored when the motor temperature sensor output is abnormal. The cause of this malfunction may be one of the following:

Hybrid vehicle control ECU malfunction
  • Hybrid vehicle control ECU internal malfunction
Motor temperature sensor malfunction
  • Internal motor temperature sensor malfunction
  • Open or short in motor temperature sensor
Wire harness between the motor temperature sensor and hybrid vehicle control ECU
  • The connectors are not connected properly
  • Foreign matter or water on the connector terminals
  • Open or short in wire harness

HINT:

If any of these DTCs are stored, the motor temperature sensor is malfunctioning and the self-protection function may not operate. Therefore under certain high load driving condition, the temperature of the motor (MG2) becomes high. If the self-protection function does not operate, the motor (MG2) may malfunction and cause the vehicle to enter fail-safe mode.

DESCRIPTION

The resistance of the thermistor built into the motor temperature sensor changes in accordance with changes in the motor (MG2) temperature. The lower the motor (MG2) temperature, the higher the thermistor resistance. Conversely, the higher the motor (MG2) temperature, the lower the resistance.

HINT:

The term "drive motor A" indicates the motor (MG2).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P0A2A11

Drive Motor "A" Temperature Sensor Circuit Short to Ground

Short to ground in the motor temperature sensor circuit

(1 trip detection logic)
  • Wire harness or connector
  • Hybrid vehicle control ECU
  • Motor temperature sensor (Hybrid vehicle transaxle assembly)

Comes on

Master Warning Light:

Comes on

P0A2A15

Drive Motor "A" Temperature Sensor Circuit Short to Auxiliary Battery or Open

Open or short to +B in the motor temperature sensor circuit

(1 trip detection logic)
  • Wire harness or connector
  • Hybrid vehicle control ECU
  • Motor temperature sensor (Hybrid vehicle transaxle assembly)

Comes on

Master Warning Light:

Comes on
Related Data List

DTC No.

Data List

P0A2A11

Motor Temperature

P0A2A15

HINT:

After confirming that DTC P0A2A11 or P0A2A15 is output, use the Techstream to check "Motor Temperature" in the Data List.

Displayed Temperature

Malfunction

-40°C (-40°F)

Open circuit or short to +B

215°C (419°F)

Short to ground

MONITOR DESCRIPTION

If the hybrid vehicle control ECU detects a malfunction of the motor temperature sensor, it will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs

P0A2C (INF P0A2A11): Drive Motor "A" Temperature Sensor Circuit Low

P0A2D (INF P0A2A15): Drive Motor "A" Temperature Sensor Circuit High

Required sensors/components

Motor temperature sensor

Frequency of operation

Continuous

Duration

TMC's intellectual property

MIL operation

1 driving cycle

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not present

TMC's intellectual property

Other conditions belong to TMC's intellectual property

-

TYPICAL MALFUNCTION THRESHOLDS

TMC's intellectual property

-

COMPONENT OPERATING RANGE

Hybrid vehicle control ECU

DTC P0A2C (INF P0A2A11) is not detected

DTC P0A2D (INF P0A2A15) is not detected

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

  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

    Click here

  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.[*1]

    HINT:

    [*1] : Normal judgment procedure.

    The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

  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 the normal judgment procedure again.

WIRING DIAGRAM

PROCEDURE

1.

CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)

(a) Check the connection condition of the hybrid vehicle control ECU connectors and the contact pressure of each terminal. Check the terminals for deformation, and check the connector for water ingress and foreign matter.

Click here

OK:

- The connector is connected securely.

- The terminals are not deformed and are connected securely.

- No water or foreign matter in the connector.

Result

Proceed to

OK

A

NG (The connector is not connected securely.)

B

NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.)

C
B

CONNECT SECURELY
C

REPAIR OR REPLACE HARNESS OR CONNECTOR
A

2.

CHECK CONNECTOR CONNECTION CONDITION (MOTOR TEMPERATURE SENSOR CONNECTOR)

(a) Check the connection condition of the motor temperature sensor connector and the contact pressure of each terminal. Check the terminals for deformation, and check the connector for water ingress and foreign matter.

Click here

OK:

- The connector is connected securely.

- The terminals are not deformed and are connected securely.

- No water or foreign matter in the connector.

Result

Proceed to

OK

A

NG (The connector is not connected securely.)

B

NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.)

C
B

CONNECT SECURELY
C

REPAIR OR REPLACE HARNESS OR CONNECTOR
A

3.

READ VALUE USING TECHSTREAM (MOTOR TEMPERATURE)

(a) Connect the Techstream to the DLC3.

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

(c) Enter the following menus: Powertrain / Hybrid Control / Data List / Motor Temperature.

(d) Read the Data List.

Powertrain > Hybrid Control > Data List

Tester Display

Motor Temperature
Result

Proceed to

-40°C (-40°F)

A

215°C (419°F)

B

Same as actual temperature

C

(e) Turn the power switch off.

B

GO TO STEP 6

C

REPAIR OR REPLACE HARNESS OR CONNECTOR
A

4.

INSPECT HYBRID VEHICLE TRANSAXLE ASSEMBLY (MOTOR TEMPERATURE SENSOR)

(a) Disconnect the C62 motor temperature sensor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C62-1 (MMT) - C62-2 (MMTG)

Power switch off

0.3436 to 1442 kΩ

*a

Component without harness connected

(Motor Temperature Sensor (Hybrid Vehicle Transaxle Assembly))

(c) Reconnect the C62 motor temperature sensor connector.

NG

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

OK

5.

INSPECT HYBRID VEHICLE CONTROL ECU

(a) Connect terminals 24 (MMT) and 23 (MMTG) of the A23 hybrid vehicle control ECU connector.

*a

Component with harness connected

(Hybrid Vehicle Control ECU)

(b) Connect the Techstream to the DLC3.

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

(d) Enter the following menus: Powertrain / Hybrid Control / Data List / Motor Temperature.

(e) Read the Data List.

Powertrain > Hybrid Control > Data List

Tester Display

Motor Temperature

OK:

Techstream Display

Condition

Specified Condition

Motor Temperature

Terminals A23-24 (MMT) and A23-23 (MMTG) connected

Power switch on (IG)

215°C (419°F)

(f) Turn the power switch off.

OK

REPAIR OR REPLACE HARNESS OR CONNECTOR
NG

REPLACE HYBRID VEHICLE CONTROL ECU

6.

INSPECT HYBRID VEHICLE TRANSAXLE ASSEMBLY (MOTOR TEMPERATURE SENSOR)

(a) Disconnect the C62 motor temperature sensor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C62-1 (MMT) - C62-2 (MMTG)

Power switch off

0.3436 to 1442 kΩ

*a

Component without harness connected

(Motor Temperature Sensor (Hybrid Vehicle Transaxle Assembly))

(c) Reconnect the C62 motor temperature sensor connector.

NG

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

OK

7.

CHECK HARNESS AND CONNECTOR (MOTOR TEMPERATURE SENSOR - HYBRID VEHICLE CONTROL ECU)

(a) Disconnect the C62 motor temperature sensor connector.

(b) Disconnect the A23 hybrid vehicle control ECU connector.

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

Standard Resistance (Check for Open):

Tester Connection

Condition

Specified Condition

C62-1 (MMT) - A23-24 (MMT)

Power switch off

Below 1 Ω

C62-2 (MMTG) - A23-23 (MMTG)

Power switch off

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

C62-1 (MMT) or A23-24 (MMT) - Body ground and other terminals

Power switch off

10 kΩ or higher

C62-2 (MMTG) or A23-23 (MMTG) - Body ground and other terminals

Power switch off

10 kΩ or higher

*a

Front view of wire harness connector

(to Motor Temperature Sensor)

*b

Rear view of wire harness connector

(to Hybrid Vehicle Control ECU)

(d) Reconnect the A23 hybrid vehicle control ECU connector.

(e) Reconnect the C62 motor temperature sensor connector.

OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Drive Motor "A" Control Module Internal Electronic Failure (P0A1B49). Drive Motor "A" Control Module Unexpected Operation (P0A1B94). Drive Motor "A" Temperature Sensor Voltage Out of Range (P0A2A1C,P0

Hybrid/EV Battery Temperature Sensor "A" Voltage Out of Range (P0A9B1C,P0AC51C,P0ACA1C). Hybrid/EV Battery Temperature Sensor "A" Signal Stuck In Range (P0A9B2A,P0AC52A,P0ACA2A,P306562). Hybrid/EV Bat

See More:

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Hybrid Control System: Hybrid/EV Battery Voltage System Isolation Internal Electronic Failure (P0AA649,P1C7C49-P1C7F49)
DESCRIPTION The hybrid vehicle control ECU monitors the battery voltage sensor and detects insulation malfunctions in the high-voltage system. DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate P0AA649 Hybrid/EV Battery Voltage System Isolation Internal Electronic Failu ...

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual

© 2025 Copyright engine.tavalon.net
0.1686