Lexus ES: Transmission Fluid Temperature Sensor "A" Circuit Short To Ground (P071011)
DESCRIPTION
The ATF temperature sensor converts the automatic transaxle fluid (ATF) temperature into a resistance value for use by the ECM.
The ECM applies voltage to the temperature sensor through terminal THO1 of the ECM.
The sensor resistance changes with the ATF temperature. As the temperature rises, the sensor resistance decreases.
One terminal of the sensor is grounded so that the sensor resistance and voltage decrease as the temperature rises.
The ECM calculates the ATF temperature based on the voltage signal.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P071011 | Transmission Fluid Temperature Sensor "A" Circuit Short To Ground | When the battery voltage is 8 V or more and the engine switch is on (IG), the ATF temperature sensor voltage is less than 0.142 V for 0.5 seconds. (1-trip detection logic) |
| Comes on | DTC stored | SAE Code: P0712 |
MONITOR DESCRIPTION
This DTC indicates a short to ground in the ATF temperature sensor circuit. The ATF temperature sensor converts the ATF temperature into an electrical resistance value. Based on the resistance, the ECM determines the ATF temperature, and can detect a short to ground in the ATF temperature sensor circuit. If the resistance value of the ATF temperature sensor is below 79 Ω*, the ECM interprets this as a malfunction of the ATF temperature sensor or in the wire harness, illuminates the MIL and stores this DTC.
*: 150°C (302°F) or higher is indicated regardless of the actual ATF temperature.
HINT:
The ATF temperature can be checked in the Data List.
MONITOR STRATEGY
| Related DTCs | P0712: ATF temperature sensor/Range check (Low voltage) |
| Required sensors/components | ATF temperature sensor (TFT sensor) |
| Frequency of operation | Continuous |
| Duration | 0.5 sec. |
| MIL operation | Immediate |
| Sequence of operation | None |
TYPICAL ENABLING CONDITIONS
| The monitor will run whenever the following DTCs are not stored | None |
| Battery voltage | 8 V or more |
| Engine switch | On (IG) |
| Starter | OFF |
TYPICAL MALFUNCTION THRESHOLDS
| TFT sensor voltage (ATF temperature) | Less than 0.142 V (More than 164°C (327°F)) |
COMPONENT OPERATING RANGE
| ATF temperature sensor (TFT sensor) resistance | 79 Ω to 156 kΩ |
CONFIRMATION DRIVING PATTERN
HINT:
- 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.
-
When clearing the permanent DTCs, refer to the Clear Permanent DTC procedure.
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- Connect the Techstream to the DLC3.
- Turn the engine switch on (IG) and turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the engine switch off and wait for 2 minutes or more.
- Turn the engine switch on (IG) and turn the Techstream on.
-
Wait for 3 seconds or more with the engine switch on (IG). [*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 / Transmission / Utility / All Readiness.
- Input the DTC: P071011.
-
Check the DTC judgment result.
Techstream 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
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
Refer to DTC P071000.
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CAUTION / NOTICE / HINT
NOTICE:
-
Perform the universal trip to clear permanent DTCs.
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-
Perform registration and/or initialization when parts related to the automatic transaxle are replaced.
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DATA LIST
NOTICE:
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.
HINT:
Using the Techstream 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.
(a) Warm up the engine.
(b) Turn the engine switch off.
(c) Connect the Techstream to the DLC3.
(d) Turn the engine switch on (IG).
(e) Turn the Techstream on.
(f) Enter the following menus: Powertrain / Transmission / Data List / A/T Oil Temperature No.1.
(g) Read the Data List according to the display on the Techstream.
Powertrain > Transmission > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| A/T Oil Temperature No.1 | ATF temperature sensor value | Min.: -40°C (-40°F) Max.: 150°C (302°F) |
| If value is -40°C (-40°F) or 150°C (302°F), ATF temperature sensor circuit is open or shorted |
| Tester Display |
|---|
| A/T Oil Temperature No.1 |
HINT:
- If DTC P071011 is output and the Techstream indicates 150°C (302°F) or higher, there is a short in the circuit.
-
If DTC P071015 is output and the Techstream indicates -40°C (-40°F), the circuit is open.
Check the temperature displayed on the Techstream 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
PROCEDURE
| 1. | READ VALUE USING TECHSTREAM |
(a) Warm up the engine.
(b) Turn the engine switch off.
(c) Connect the Techstream to the DLC3.
(d) Turn the engine switch on (IG).
(e) Turn the Techstream on.
(f) Enter the following menus: Powertrain / Transmission / Data List / A/T Oil Temperature No.1.
(g) Read the Data List according to the display on the Techstream.
Powertrain > Transmission > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| A/T Oil Temperature No.1 | ATF temperature sensor value | Min.: -40°C (-40°F) Max.: 150°C (302°F) |
| If value is -40°C (-40°F) or 150°C (302°F), ATF temperature sensor circuit is open or shorted |
| Tester Display |
|---|
| A/T Oil Temperature No.1 |
| Result | Proceed to |
|---|---|
| Data List value is normal | A |
| Data List value is not normal | B |
| A | .gif) | GO TO STEP 3 |
|
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| 2. | CHECK HARNESS AND CONNECTOR (ATF TEMPERATURE SENSOR - ECM) |
(a) Disconnect the C78 ECM connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| C78-46 (THO1) - C78-45 (ETHO) | Always | 79 Ω to 156 kΩ |
| C78-45 (ETHO) - Body ground | Always | 10 kΩ or higher |
| C78-46 (THO1) - Body ground | Always | 10 kΩ or higher |
HINT:
If the resistance is out of the specified range at any of the ATF temperatures shown in the table below, the driveability of the vehicle may decrease.
| ATF Temperature | Specified Condition |
|---|---|
| 10°C (50°F) | 5 to 8 kΩ |
| 25°C (77°F) | 2.5 to 4.5 kΩ |
| 110°C (230°F) | 0.22 to 0.28 kΩ |
| NG | | GO TO STEP 4 |
|
| 3. | REPLACE ECM |
(a) Replace the ECM.
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| NEXT | | PERFORM REGISTRATION |
| 4. | CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) |
(a) Disconnect the C30 transmission wire connector.
(b) Disconnect the C78 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| C30-1 (OIL) or C78-46 (THO1) - Body ground | Always | 10 kΩ or higher |
| C30-2 (E2) or C78-45 (ETHO) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE TRANSMISSION WIRE (ATF TEMPERATURE SENSOR) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - ECM) |
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