RM36D0EC _51 Engine / Hybrid System _083048 HYBRID / BATTERY CONTROL _0709511 HYBRID CONTROL SYSTEM C

HYBRID / BATTERY CONTROL  HYBRID CONTROL SYSTEM  P274A11  Transmission Fluid Temperature Sensor "C" Circuit Short to Ground  P274A15  Transmission Fluid Temperature Sensor "C" Circuit Short to Auxiliary Battery or Open  


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 assembly internal malfunction
·

Hybrid vehicle control ECU assembly 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 assembly
·

The connectors are not connected properly

·

Foreign matter or water on the connector terminals

·

Open or short in wire harness



DESCRIPTION

A380229E03
0.104,0.406 1.208,0.76 1.104,0.354 10 false Resistance (kΩ) 1.75,3.052 3.385,3.375 1.635,0.323 10 false Temperature (°C (°F)) 0.729,2.26 0.885,2.458 0.156,0.198 10 false 0 0.865,2.396 1.021,2.594 0.156,0.198 10 false 0 1.563,2.396 1.865,2.625 0.302,0.229 10 false 50 1.188,2.396 1.49,2.625 0.302,0.229 10 false 25 1.938,2.396 2.24,2.625 0.302,0.229 10 false 75 2.271,2.396 2.573,2.625 0.302,0.229 10 false 100 2.635,2.396 2.938,2.625 0.302,0.229 10 false 125 3.01,2.396 3.313,2.625 0.302,0.229 10 false 150 0.719,2.031 1.021,2.26 0.302,0.229 10 false 5 0.688,1.781 0.99,2.01 0.302,0.229 10 false 10 0.677,1.563 0.979,1.792 0.302,0.229 10 false 15 0.688,1.333 0.99,1.563 0.302,0.229 10 false 20 0.688,1.115 0.99,1.344 0.302,0.229 10 false 25 0.688,0.885 0.99,1.115 0.302,0.229 10 false 30 1.167,2.635 1.479,2.906 0.313,0.271 10 false (77) 0.813,2.625 1.125,2.896 0.313,0.271 10 false (32) 1.5,2.646 1.875,2.927 0.375,0.281 10 false (122) 1.885,2.656 2.292,2.927 0.406,0.271 10 false (167) 2.26,2.656 2.667,2.927 0.406,0.271 10 false (212) 2.635,2.656 3.031,2.938 0.396,0.281 10 false (257) 3.021,2.656 3.417,2.99 0.396,0.333 10 false (302)

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 Note
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 assembly

·

Hybrid vehicle transaxle assembly (Transmission fluid temperature sensor)


Comes on Master Warning:
Comes on 		SAE Code:
P274C
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 assembly

·

Hybrid vehicle transaxle assembly (Transmission fluid temperature sensor)


Comes on Master Warning:
Comes on 		SAE Code:
P274D

Related Data List
DTC No. Data List
P274A11 Transaxle Oil Temperature
P274A15

HINT:

After confirming that DTC P274A11 or P274A15 is output, use the GTS 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


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 hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM>UTILITY

·

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

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM>DTC CHECK / CLEAR



1.

Connect the GTS to the DLC3.

2.

Turn the power switch on (IG) and turn the GTS 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 GTS on.

6.

With power 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.


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, perform the normal judgment procedure again.




WIRING DIAGRAM

A416702E55
2.313,1.188 2.771,1.385 0.458,0.198 10 false 3 1.802,1.938 2.563,2.26 0.76,0.323 10 false ETTA 1.906,1.188 2.667,1.51 0.76,0.323 10 false TTA 2.302,1.938 2.76,2.135 0.458,0.198 10 false 13 0.292,2.677 1.052,3 0.76,0.323 10 false C51 0.302,2.844 2.417,3.531 2.115,0.688 10 false Transmission Fluid Temperature Sensor (Hybrid Vehicle Transaxle Assembly) 2.552,2.656 4.531,3.167 1.979,0.51 10 false No. 1 Engine Room Relay Block and Junction Block Assembly Connector 2.563,2.521 3.323,2.844 0.76,0.323 10 false CA4 3.094,1.177 3.854,1.5 0.76,0.323 10 false 2 3.042,1.938 3.802,2.26 0.76,0.323 10 false 3 3.688,1.938 4.448,2.26 0.76,0.323 10 false 3 3.698,1.177 4.458,1.5 0.76,0.323 10 false 2 4.615,1.167 5.375,1.49 0.76,0.323 10 false 41 4.885,1.188 5.646,1.51 0.76,0.323 10 false TTA 4.615,1.917 5.375,2.24 0.76,0.323 10 false 42 4.875,1.938 5.635,2.26 0.76,0.323 10 false ETTA 4.948,2.688 5.708,3.01 0.76,0.323 10 false A31 4.938,2.833 6.646,3.51 1.708,0.677 10 false Hybrid Vehicle Control ECU Assembly 5.958,1.302 6.719,1.625 0.76,0.323 10 false ADC

PROCEDURE

1.CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU ASSEMBLY CONNECTOR)

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM>P0A2A11

Result:
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



A

2.CHECK CONNECTOR CONNECTION CONDITION (INTERMEDIATE CONNECTOR)

B

CONNECT SECURELY

C

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.CHECK CONNECTOR CONNECTION CONDITION (INTERMEDIATE CONNECTOR)
a.

Check that the intermediate connector which connects the transmission fluid temperature sensor to the hybrid vehicle control ECU is securely connected with no deformation, and that there is no contamination by water or foreign matter.

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>ELECTRONIC CIRCUIT INSPECTION PROCEDURE

HINT:

For vehicles in which the intermediate connector is inside the relay block, check for signs of water intrusion inside the relay block.


OK:

- The connector is connected securely.

- The terminals are not deformed and are connected securely.

- No water or foreign matter in the connectors.



Result:
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



A

3.CHECK CONNECTOR CONNECTION CONDITION (TRANSMISSION FLUID TEMPERATURE SENSOR CONNECTOR)

B

CONNECT SECURELY

C

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.CHECK CONNECTOR CONNECTION CONDITION (TRANSMISSION FLUID TEMPERATURE SENSOR CONNECTOR)
a.
C412484

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 hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>ELECTRONIC CIRCUIT INSPECTION PROCEDURE

OK:

- The connector is connected securely.

- The terminals are not deformed and are connected securely.

- No water or foreign matter in the connector.



Result:
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



A

4.READ VALUE USING GTS (TRANSAXLE OIL TEMPERATURE)

B

CONNECT SECURELY

C

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.READ VALUE USING GTS (TRANSAXLE OIL TEMPERATURE)
a.

Connect the GTS 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
50003 397 322

d.

Read the Data List.

Result:
Result Proceed to
-40°C (-40°F) A
215°C (419°F) B
Same as actual temperature C



e.

Turn the power switch off.



A

5.INSPECT HYBRID VEHICLE TRANSAXLE ASSEMBLY (TRANSMISSION FLUID TEMPERATURE SENSOR)

B

7.INSPECT HYBRID VEHICLE TRANSAXLE ASSEMBLY (TRANSMISSION FLUID TEMPERATURE SENSOR)

C

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.INSPECT HYBRID VEHICLE TRANSAXLE ASSEMBLY (TRANSMISSION FLUID TEMPERATURE SENSOR)
a.
C412484N01
2.333,1.323 2.688,1.542 0.354,0.219 2.333,1.333 2.667,1.521 0.333,0.188 10 true C51

Disconnect the C51 transmission fluid temperature sensor connector.


b.
A385117C62
0.229,0.906 0.667,1.198 0.438,0.292 2.458,0.542 1.823,1 true 1.625,1.438 0.896,1.823 true 0.135,0.083 0.448,0.281 0.313,0.198 10 false *a 2.469,0.396 2.927,0.594 0.458,0.198 10 false TTA 0.604,1.844 1.063,2.042 0.458,0.198 10 false ETTA 0.323,0.979 0.635,1.177 0.313,0.198 10 false C51
*a Component without harness connected
(Transmission Fluid Temperature Sensor (Hybrid Vehicle Transaxle Assembly))


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

Standard Resistance:
Tester Connection Condition Specified Condition
C51-3 (TTA) - C51-13 (ETTA) Power switch off 1.393 to 75.8 kΩ



c.

Reconnect the C51 transmission fluid temperature sensor connector.


Result:
Proceed to
OK
NG



OK

6.INSPECT HYBRID VEHICLE CONTROL ECU ASSEMBLY

NG

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

Click hereDrivetrain>P710 (HYBRID TRANSMISSION / TRANSAXLE)>HYBRID VEHICLE TRANSAXLE>REMOVAL


6.INSPECT HYBRID VEHICLE CONTROL ECU ASSEMBLY
a.

Connect terminals 41 (TTA) and 42 (ETTA) of the A31 hybrid vehicle control ECU assembly connector.

A494962C28
2.531,0.198 3.021,0.49 0.49,0.292 2.875,1.615 3.125,2.396 true 2.75,1.646 2.031,2.406 true 0.104,0.115 0.417,0.313 0.313,0.198 10 false *a 2.646,0.26 3.104,0.458 0.458,0.198 10 false A31 1.656,2.417 2.146,2.667 0.49,0.25 10 false ETTA 3,2.417 3.615,2.615 0.615,0.198 10 false TTA
*a Component with harness connected
(Hybrid Vehicle Control ECU Assembly) 		- -



b.

Connect the GTS 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
50003 397 322
OK:
Tester Display Condition Specified Condition
Transaxle Oil Temperature Terminals A31-41 (TTA) and A31-42 (ETTA) connected
Power switch on (IG) 		215°C (419°F)



Result:
Proceed to
OK
NG


f.

Turn the power switch off.



OK

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

NG

REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID VEHICLE CONTROL ECU>REMOVAL


7.INSPECT HYBRID VEHICLE TRANSAXLE ASSEMBLY (TRANSMISSION FLUID TEMPERATURE SENSOR)
a.
C412484N01
2.333,1.323 2.688,1.542 0.354,0.219 2.333,1.333 2.667,1.521 0.333,0.188 10 true C51

Disconnect the C51 transmission fluid temperature sensor connector.


b.
A385117C63
0.229,0.906 0.667,1.198 0.438,0.292 2.458,0.542 1.823,1 true 1.625,1.438 0.896,1.823 true 0.135,0.083 0.448,0.281 0.313,0.198 10 false *a 2.469,0.396 2.927,0.594 0.458,0.198 10 false TTA 0.604,1.844 1.063,2.042 0.458,0.198 10 false ETTA 0.313,0.969 0.625,1.167 0.313,0.198 10 false C51
*a Component without harness connected
(Transmission Fluid Temperature Sensor (Hybrid Vehicle Transaxle Assembly))


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

Standard Resistance:
Tester Connection Condition Specified Condition
C51-3 (TTA) - C51-13 (ETTA) Power switch off 1.393 to 75.8 kΩ



c.

Reconnect the C51 transmission fluid temperature sensor connector.


Result:
Proceed to
OK
NG



OK

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

NG

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

Click hereDrivetrain>P710 (HYBRID TRANSMISSION / TRANSAXLE)>HYBRID VEHICLE TRANSAXLE>REMOVAL


8.CHECK HARNESS AND CONNECTOR (TRANSMISSION FLUID TEMPERATURE SENSOR - HYBRID VEHICLE CONTROL ECU ASSEMBLY)
a.

Disconnect the C51 transmission fluid temperature sensor connector.


b.

Disconnect the A31 hybrid vehicle control ECU assembly connector.


c.
A556745C02
1.521,2.219 1.885,2.5 0.365,0.281 0.344,0.938 0.688,1.208 0.344,0.271 1.688,0.896 2.229,0.375 true 1.802,1.219 2.073,1.74 true 1.771,3.635 1.552,4.156 true 1.615,3.635 1.094,4.177 true 0.146,0.115 0.458,0.313 0.313,0.198 10 false *a 0.208,2.354 0.521,2.552 0.313,0.198 10 false *b 0.385,0.99 0.698,1.188 0.313,0.198 10 false C51 1.573,2.271 1.885,2.469 0.313,0.198 10 false A31 2.302,0.302 2.698,0.573 0.396,0.271 10 false TTA 1.958,1.802 2.49,2.115 0.531,0.313 10 false ETTA 0.896,4.208 1.427,4.521 0.531,0.313 10 false TTA 1.479,4.219 1.875,4.49 0.396,0.271 10 false ETTA
*a Front view of wire harness connector
(to Transmission Fluid Temperature Sensor)
*b Front view of wire harness connector
(to Hybrid Vehicle Control ECU Assembly)


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

Standard Resistance (Check for Open):
Tester Connection Condition Specified Condition
C51-3 (TTA) - A31-41 (TTA) Power switch off Below 1 Ω
C51-13 (ETTA) - A31-42 (ETTA) Power switch off Below 1 Ω


Standard Resistance (Check for Short):
Tester Connection Condition Specified Condition
C51-3 (TTA) or A31-41 (TTA) - Body ground and other terminals Power switch off 10 kΩ or higher
C51-13 (ETTA) or A31-42 (ETTA) - Body ground and other terminals Power switch off 10 kΩ or higher



d.

Reconnect the A31 hybrid vehicle control ECU assembly connector.


e.

Reconnect the C51 transmission fluid temperature sensor connector.


Result:
Proceed to
OK
NG



OK

REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID VEHICLE CONTROL ECU>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR