HYBRID / BATTERY CONTROL HYBRID CONTROL SYSTEM P274A1C Transmission Fluid Temperature Sensor "C" Voltage Out of Range P274A1F Transmission Fluid Temperature Sensor "C" Circuit Intermittent
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 malfunction
Internal transmission fluid temperature sensor malfunction
Open or short in transmission fluid temperature sensor
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.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate | Note |
|---|---|---|---|---|---|---|
| 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:
Comes on |
SAE Code:
P274B |
| 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:
Comes on |
SAE Code:
P274E |
| DTC No. | Data List |
|---|---|
| P274A1C | ·
Generator Temperature ·
Motor Temperature ·
Transaxle Oil Temperature |
| P274A1F | Transaxle Oil Temperature |
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.
·When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Connect the GTS to the DLC3.
Turn the power switch on (IG) and turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off.
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]
Turn the power switch on (IG) and turn the GTS 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.
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.
Connect the GTS to the DLC3.
Turn the power switch on (IG) and turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off and wait for 2 minutes or more.
Turn the power switch on (IG) and turn the GTS on.
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.
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
Refer to the wiring diagram for DTC P274A11.
PROCEDURE
Connect the GTS to the DLC3.
Turn the power switch on (READY).
Enter the following menus: Powertrain / Engine / Trouble Codes.
Check for DTCs.
- Powertrain > Engine > Trouble Codes
- 50001 372
- Result:
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 |
Turn the power switch off.
A
B
for A25B-FXS:
for A25D-FXS:
for A25F-FXS:
Check for DTCs.
- Powertrain > Hybrid Control > Trouble Codes
- 50001 397
- Result:
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 | |
|---|---|
| P274A11 | Transmission Fluid Temperature Sensor "C" Circuit Short to Ground |
| P274A15 | Transmission Fluid Temperature Sensor "C" Circuit Short to Auxiliary Battery or Open |
Turn the power switch off.
A
B
- 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
B
C
Disconnect the A31 hybrid vehicle control ECU assembly connector.
| *a | 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:
Tester Connection Condition Specified Condition A31-41 (TTA) - A31-42 (ETTA) Power switch off 1.393 to 75.8 kΩ
Reconnect the A31 hybrid vehicle control ECU assembly connector.
- Result:
Proceed to OK NG
OK
NG
- 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
B
C
Disconnect the CA4 No. 1 engine room relay block and No. 1 junction block assembly connector.
Disconnect the A31 hybrid vehicle control ECU assembly connector.
Measure the resistance according to the value(s) in the table below.
- HINT:
-
When performing the measurement, lightly jiggle the wire harness up and down and left and right and confirm that the resistance does not fluctuate.
- Standard Resistance (Check for Open):
Tester Connection Condition Specified Condition CA4-2 (TTA) - A31-41 (TTA) Power switch off Below 1 Ω CA4-3 (ETTA) - A31-42 (ETTA) Power switch off Below 1 Ω
- Standard Resistance (Check for Short):
Tester Connection Condition Specified Condition CA4-2 (TTA) or A31-41 (TTA) - Body ground and other terminals Power switch off 10 kΩ or higher CA4-3 (ETTA) or A31-42 (ETTA) - Body ground and other terminals Power switch off 10 kΩ or higher
Reconnect the A31 hybrid vehicle control ECU assembly connector.
Reconnect the CA4 No. 1 engine room relay block and No. 1 junction block assembly connector.
- Result:
Proceed to OK NG
OK
NG
- 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
B
C
Disconnect the C51 transmission fluid temperature sensor connector.
Disconnect the CA4 No. 1 engine room relay block and No. 1 junction block assembly connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance (Check for Open):
Tester Connection Condition Specified Condition CA4-2 (TTA) - C51-3 (TTA) Power switch off Below 1 Ω CA4-3 (ETTA) - C51-13 (ETTA) Power switch off Below 1 Ω
- Standard Resistance (Check for Short):
Tester Connection Condition Specified Condition CA4-2 (TTA) or C51-3 (TTA) - Body ground and other terminals Power switch off 10 kΩ or higher CA4-3 (ETTA) or C51-13 (ETTA) - Body ground and other terminals Power switch off 10 kΩ or higher
Reconnect the CA4 No. 1 engine room relay block and No. 1 junction block assembly connector.
Reconnect the C51 transmission fluid temperature sensor connector.
- Result:
Proceed to OK NG
OK
NG
Disconnect the CA4 No. 1 engine room relay block and No. 1 junction block assembly connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition CA4-2 (TTA) - CA4-3 (ETTA) Power switch off 1.393 to 75.8 kΩ
Reconnect the CA4 No. 1 engine room relay block and No. 1 junction block assembly connector.
- Result:
Proceed to OK NG
OK
NG
- Result:
Proceed to OK NG
OK
NG