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.
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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.
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- When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
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DTC P274A1C
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG) and turn the Techstream 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 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.
- 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 or N/A, perform the normal judgment procedure again.
DTC P274A1F
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG) and turn the Techstream 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 Techstream 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 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) |
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OK |
| REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY |
NG |
| CONNECT SECURELY | |