The No. 1 ATF temperature sensor converts the fluid temperature into a resistance value for use by the ECM.
The ECM applies a voltage to the temperature sensor through terminal THO1 of the ECM.
The sensor resistance changes with the ATF temperature. As the temperature becomes higher, the sensor resistance decreases.
One terminal of the sensor is grounded so that the sensor resistance decreases and the voltage goes down as the temperature becomes higher.
The ECM calculates the fluid temperature based on the voltage signal.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P071000 | Transmission Fluid Temperature Sensor "A" Circuit Range/Performance | Either of the following conditions is met (2 trip detection logic):
·
Certain monitor enabling conditions are met and the No. 1 ATF temperature is below 20°C (68°F). ·
Certain monitor enabling conditions are met and the No. 1 ATF temperature is 110°C (230°F) or higher. |
No. 1 ATF temperature sensor (transmission wire) | Comes on | DTC stored | SAE Code:
P0711 |
| Vehicle Condition | |||
|---|---|---|---|
| Pattern 1 | Pattern 2 | ||
| Diagnostic Condition | Certain monitor enabling conditions are met. | ○ | ○ |
| Malfunction Condition | The No. 1 ATF temperature is below 20°C (68°F). | ○ | - |
| The No. 1 ATF temperature is 110°C (230°F) or higher. | - | ○ | |
| Duration | - | - | |
| Detection Logic | 2 trip detection logic | 2 trip detection logic | |
This DTC is stored when either of the above detection patterns are met.
This DTC indicates that there is a problem with output signals from the No. 1 ATF temperature sensor and that the sensor itself is defective. The No. 1 ATF temperature sensor converts the ATF temperature into an electrical resistance value. Based on the resistance, the ECM determines the ATF temperature and detects an open or short in the No. 1 ATF temperature sensor circuit or a fault of the No. 1 ATF temperature sensor.
After running the vehicle for a certain period, the ATF temperature should increase. If the ATF temperature is below 20°C (68°F) after running the vehicle for a certain period, the ECM interprets this as a malfunction, illuminates the MIL and stores the DTC.
When the ATF temperature is 110°C (230°F) or higher and the engine coolant temperature takes 10 seconds or more to reach 60°C (140°F) after a cold start, the ECM also determines this as a malfunction, illuminates the MIL and stores the DTC.
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON and turn the GTS on.
Start the engine and perform both of the following:
Drive the vehicle 16 km (9.9 miles) or more over a period of 39 minutes or more.
After 55 minutes or more have elapsed since the engine was started.
Stop the vehicle.
Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
Input the DTC: P071000.
Check the DTC judgment result.
| GTS Display | Description |
|---|---|
| NORMAL | ·
DTC judgment completed ·
System normal |
| ABNORMAL | ·
DTC judgment completed ·
System abnormal |
| INCOMPLETE | ·
DTC judgment not completed ·
Perform driving pattern after confirming DTC enabling conditions |
| N/A | ·
Unable to perform DTC judgment ·
Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit |
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 Confirmation Driving Pattern and check the DTC judgment result again.
Perform registration and/or initialization when parts related to the automatic transmission are replaced.
DATA LIST
Using the GTS to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.
In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.
Warm up the engine.
Turn the ignition switch off.
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Transmission / Data List / A/T Oil Temperature No.1.
Read the Data List according to the display on the GTS.
| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| A/T Oil Temperature No.1 | No. 1 ATF temperature sensor value | Min.: -40°C (-40°F)
Max.: 150°C (302°F) |
·
Approx. 80°C (176°F): After stall test ·
Equal to ambient temperature when cold soak |
If the value -40°C (-40°F) or 150°C (302°F), No. 1 ATF temperature sensor circuit is open or shorted. |
| Tester Display |
|---|
| A/T Oil Temperature No.1 |
When DTC P071011 is output and the GTS shows 150°C (302°F) or higher, there is a short circuit.
When DTC P071015 is output and the GTS shows -40°C (-40°F), there is an open circuit.
Check the temperature displayed on the GTS in order to check if a malfunction exists.
| Temperature Displayed | Malfunction |
|---|---|
| -40°C (-40°F) | Open circuit |
| 150°C (302°F) or higher | Short circuit |
If a circuit related to the No. 1 ATF temperature sensor becomes open, P071015 will be stored in approximately 0.5 seconds. It is not necessary to inspect the circuit when P071000 is output.
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Transmission / Trouble Codes.
Read the DTCs using the GTS.
| Result | Proceed to |
|---|---|
| Only DTC P071000 is output | A |
| DTC P071000 and other DTCs are output | B |
If any DTCs other than DTC P071000 are output, perform troubleshooting for those DTCs first.
A
B
Check the automatic transmission fluid level.
Automatic transmission fluid level is correct.
| Proceed to |
|---|
| OK |
| NG |
OK
NG