Toyota Avalon (XX50): Hybrid/EV Powertrain Control Module EEPROM Calibration / Parameter Memory Failure (P062F46). Transmission Fluid Temperature Sensor "C" Voltage Out of Range (P274A1C,P274A1F). Transmission Fluid Temper

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Engine / Hybrid / Battery Control / Hybrid Control System / Hybrid/EV Powertrain Control Module EEPROM Calibration / Parameter Memory Failure (P062F46). Transmission Fluid Temperature Sensor "C" Voltage Out of Range (P274A1C,P274A1F). Transmission Fluid Temper

Hybrid/EV Powertrain Control Module EEPROM Calibration / Parameter Memory Failure (P062F46)

DESCRIPTION

The hybrid vehicle control ECU monitors its internal operation and will store these DTCs when it detects an internal malfunction. If these DTCs are output, replace the hybrid vehicle control ECU.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P062F46

Hybrid/EV Powertrain Control Module EEPROM Calibration / Parameter Memory Failure

Either of the following conditions is met:

  • ECU internal malfunction

    (EEPROM error)

  • The power switch is turned off when the auxiliary battery voltage is 9.5 V or less.

(1 trip detection logic)
  • Hybrid vehicle control ECU
  • Auxiliary battery

Comes on

Master Warning Light:

Comes on

MONITOR DESCRIPTION

The hybrid vehicle control ECU monitors its internal operation. If the internal operation is malfunctioning, the hybrid vehicle control ECU illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs

P062F (INF P062F46): Internal Control Module EEPROM Error

Required sensors/components

hybrid vehicle control ECU

Frequency of operation

Continuous

Duration

TMC's intellectual property

MIL operation

Immediately

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not stored

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 P062F (INF P062F46) 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 15 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.

PROCEDURE

1.

CHECK DATA (VEHICLE CONTROL HISTORY (HYBRID CONTROL))

(a) Connect the Techstream to the DLC3.

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

(c) Enter the following menus: Powertrain / Hybrid Control / Utility / Vehicle Control History (RoB).

Powertrain > Hybrid Control > Utility

Tester Display

Vehicle Control History (RoB)

(d) Read and record the Vehicle Control History (Hybrid Control).

Result

Proceed to

Auxiliary Battery Voltage Low (HV) or Auxiliary Battery Voltage Low (Inverter) is stored.

A

Auxiliary Battery Voltage Low (HV) and Auxiliary Battery Voltage Low (Inverter) are not stored.

B

(e) Turn the power switch off.

B

REPLACE HYBRID VEHICLE CONTROL ECU

A

2.

CHECK DATA (FREEZE FRAME DATA (HYBRID CONTROL) AND VEHICLE CONTROL HISTORY (HYBRID CONTROL))

(a) Connect the Techstream to the DLC3.

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

(c) Read the Freeze Frame Data of DTC P062F46.

HINT:

The value of the Freeze Frame Data item BATT Voltage immediately after the power switch is turned on (IG) may be 16.00 V (15.99 V), however this does not indicate a malfunction.

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

Powertrain > Hybrid Control > Trouble Codes

(2) According to the display on the Techstream, read the Freeze Frame Data and make a note of the value of Total Distance Traveled.

(d) Read the data recorded in the Vehicle Control History item (Auxiliary Battery Voltage Low (HV) or Auxiliary Battery Voltage Low (Inverter)) which was stored when the auxiliary battery voltage dropped below the threshold.

(1) Enter the following menus: Powertrain / Hybrid Control / Utility / Vehicle Control History (RoB).

Powertrain > Hybrid Control > Utility

Tester Display

Vehicle Control History (RoB)

(2) According to the display on the Techstream, read the data of the Vehicle Control History data and make a note of the value of Total Distance Traveled.

(e) Compare the values in the Freeze Frame Data and the Vehicle Control History.

Result

Proceed to

The total distance driven is the same.

A

The total distance driven is not the same.

B

(f) Turn the power switch off.

B

REPLACE HYBRID VEHICLE CONTROL ECU

A

3.

CHECK AUXILIARY BATTERY VOLTAGE

(a) Turn the power switch off and turn on the high beam headlights for 30 seconds. This will remove the surface charge from the auxiliary battery.

(b) Measure the auxiliary battery voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

Positive (+) auxiliary battery terminal - Negative (-) auxiliary battery terminal

20°C (68°F), Power switch off

12.0 V or higher

HINT:

This DTC may be stored when the power switch is turned off when the auxiliary battery voltage is low. In this case, when the auxiliary battery voltage is no longer low, after the power switch is turned on (IG) and then off several times, the vehicle will be judged as normal and the master warning light will turn off.

OK

GO TO STEP 5

NG

4.

RECHARGE OR REPLACE AUXILIARY BATTERY
NEXT

5.

CLEAR DTC

Click here

NEXT

6.

SIMULATION TEST

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch off and wait for 2 minutes or more.

(c) Turn the power switch on (IG) and turn the Techstream on.

(d) With power switch on (IG) and wait for 15 seconds or more.

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

(f) Check if DTCs are output.

Powertrain > Hybrid Control > Trouble Codes

Result

Proceed to

P062F46 is not output.

A

P062F46 is output.

B

(g) Turn the power switch off.

A

END
B

REPLACE HYBRID VEHICLE CONTROL ECU

Transmission Fluid Temperature Sensor "C" Voltage Out of Range (P274A1C,P274A1F)

DTC SUMMARY

MALFUNCTION DESCRIPTION

These DTCs are stored when the transmission fluid 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
Transmission fluid temperature sensor malfunction
  • Internal transmission fluid temperature sensor malfunction
  • Open or short in transmission fluid temperature sensor
Wire harness between the transmission fluid 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

DESCRIPTION

Refer to the description for DTC P274A11.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P274A1C

Transmission Fluid Temperature Sensor "C" Voltage Out of Range

After a long soak, the value of the transmission fluid temperature sensor is different from the value of the other temperature sensors.

(2 trip detection logic)

Hybrid vehicle transaxle assembly (Transmission fluid temperature sensor)

Comes on

Master Warning Light:

Comes on

P274A1F

Transmission Fluid Temperature Sensor "C" Circuit Intermittent

Sudden change in transmission fluid temperature sensor output or hunting:

Unusual sudden change in transmission fluid temperature sensor output occurs and offset condition continues for a certain period of time, or unusual change in transmission fluid temperature sensor output occurs repeatedly.

(1 trip detection logic)

Hybrid vehicle transaxle assembly (Transmission fluid temperature sensor)

Comes on

Master Warning Light:

Comes on
Related Data List

DTC No.

Data List

P274A1C
  • Generator Temperature
  • Motor Temperature
  • Transaxle Oil Temperature

P274A1F

Transaxle Oil Temperature

MONITOR DESCRIPTION

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

MONITOR STRATEGY

Related DTCs

P274B (INF P274A1C): Transmission Fluid Temperature Sensor "C" Circuit Range/Performance

P274E (INF P274A1F): Transmission Fluid Temperature Sensor "C" Circuit Intermittent

Required sensors/components

Transmission fluid temperature sensor

Frequency of operation

Continuous

Duration

TMC's intellectual property

MIL operation

2 driving cycles / 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 P274B (INF P274A1C) is not detected

DTC P274E (INF P274A1F) 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

DTC P274A1C
  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.
  5. Leave the vehicle as is for 5 hours or more and then check the values of the Data List items "Generator Temperature", "Motor Temperature" and "Transaxle Oil Temperature". [*1]
  6. Turn the power switch on (IG) and turn the Techstream on. [*2]

    HINT:

    [*1] to [*2]: 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.
DTC P274A1F
  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.

PROCEDURE

1.

CHECK DTC OUTPUT (ENGINE)

(a) Connect the Techstream to the DLC3.

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

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

(d) Check for DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

No DTCs are output, or DTCs except the ones in the table below are also output.

A

Any of the following DTCs are also output.

B

Relevant DTC

P261029

ECM/PCM Engine Off Timer Performance Signal Invalid

(e) Turn the power switch off.

B

GO TO DTC CHART (SFI SYSTEM)

A

2.

CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)

Click here

OK

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

NG

CONNECT SECURELY

Transmission Fluid Temperature Sensor "C" Circuit Short to Ground (P274A11,P274A15)

DTC SUMMARY

MALFUNCTION DESCRIPTION

These DTCs are stored when the transmission fluid 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
Transmission fluid temperature sensor malfunction
  • Internal transmission fluid temperature sensor malfunction
  • Open or short in transmission fluid temperature sensor
Wire harness between the transmission fluid 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

DESCRIPTION

The resistance of the thermistor built into the transmission fluid temperature sensor changes in accordance with changes in the transmission fluid temperature. The lower the transmission fluid temperature, the higher the thermistor resistance. Conversely, the higher the transmission fluid temperature, the lower the resistance.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P274A11

Transmission Fluid Temperature Sensor "C" Circuit Short to Ground

Short to ground in the transmission fluid temperature sensor circuit

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

Comes on

Master Warning Light:

Comes on

P274A15

Transmission Fluid Temperature Sensor "C" Circuit Short to Auxiliary Battery or Open

Open or short to +B in the transmission fluid temperature sensor circuit

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

Comes on

Master Warning Light:

Comes on
Related Data List

DTC No.

Data List

P274A11

Transaxle Oil Temperature

P274A15

HINT:

After confirming that DTC P274A11 or P274A15 is output, use the Techstream to check "Transaxle Oil 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 transmission fluid temperature sensor, it will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs

P274C (INF P274A11): Transmission Fluid Temperature Sensor "C" Circuit Low

P274D (INF P274A15): Transmission Fluid Temperature Sensor "C" Circuit High

Required sensors/components

Transmission fluid 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 P274C (INF P274A11) is not detected

DTC P274D (INF P274A15) 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)

Click here

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 (TRANSMISSION FLUID TEMPERATURE SENSOR CONNECTOR)

(a) Check the connection condition of the transmission fluid 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 (TRANSAXLE OIL 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 / Transaxle Oil Temperature.

Powertrain > Hybrid Control > Data List

Tester Display

Transaxle Oil Temperature

(d) Read the Data List.

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 (TRANSMISSION FLUID TEMPERATURE SENSOR)

(a) Disconnect the C63 transmission fluid temperature sensor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C63-3(TTA) - C63-13(ETTA)

Power switch off

0.3436 to 1442 kΩ

*a

Component without harness connected

(Transmission Fluid Temperature Sensor (Hybrid Vehicle Transaxle Assembly))

(c) Reconnect the C63 transmission fluid temperature sensor connector.

NG

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

OK

5.

INSPECT HYBRID VEHICLE CONTROL ECU

(a) Connect terminals 21 (TTA) and 31 (ETTA) 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 / Transaxle Oil Temperature.

(e) Read the Data List.

Powertrain > Hybrid Control > Data List

Tester Display

Transaxle Oil Temperature

OK:

Tester Display

Condition

Specified Condition

Transaxle Oil Temperature

Terminals A23-21 (TTA) and A23-31 (ETTA) connected

Power switch on (IG)

215°C (419°F)

(f) Turn the power switch off.

OK

REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION FLUID TEMPERATURE SENSOR - HYBRID VEHICLE CONTROL ECU)
NG

REPLACE HYBRID VEHICLE CONTROL ECU

6.

INSPECT HYBRID VEHICLE TRANSAXLE ASSEMBLY (TRANSMISSION FLUID TEMPERATURE SENSOR)

(a) Disconnect the C63 transmission fluid temperature sensor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C63-3(TTA) - C63-13(ETTA)

Power switch off

0.3436 to 1442 kΩ

*a

Component without harness connected

(Transmission Fluid Temperature Sensor (Hybrid Vehicle Transaxle Assembly))

(c) Reconnect the C63 transmission fluid temperature sensor connector.

NG

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

OK

7.

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

(a) Disconnect the C63 transmission fluid 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

C63-3 (TTA) - A23-21 (TTA)

Power switch off

Below 1 Ω

C63-13 (ETTA) - A23-31 (ETTA)

Power switch off

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

C63-3 (TTA) or A23-21 (TTA) - Body ground and other terminals

Power switch off

10 kΩ or higher

C63-13 (ETTA) or A23-31 (ETTA) - Body ground and other terminals

Power switch off

10 kΩ or higher

*a

Front view of wire harness connector

(to Transmission Fluid 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 C63 transmission fluid temperature sensor connector.

OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

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