-
No. 1 ATF temperature sensor resistance changes from (a) to (b) or from (b) to (a) in less than 0.5 sec., and P0712 and P0713 are not detected (1 trip detection logic):
- No. 1 ATF temperature sensor resistance is less than 79 Ω
- No. 1 ATF temperature sensor resistance is more than 156 kΩ
| Last Modified: 7-3-2017 | 6.8:8.0.40 | Doc ID: RM000000W8503MX |
| Model Year Start: 2007 | Model: LX470 | Prod Date Range: [08/2006 - ] |
| Title: A750F AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P0710,P0712,P0713; Transmission Fluid Temperature Sensor "A" Circuit; 2007 MY LX470 [08/2006 - ] | ||
|
DTC |
P0710 |
Transmission Fluid Temperature Sensor "A" Circuit |
|
DTC |
P0712 |
Transmission Fluid Temperature Sensor "A" Circuit Low Input |
|
DTC |
P0713 |
Transmission Fluid Temperature Sensor "A" Circuit High Input |
DESCRIPTION
The Automatic Transmission Fluid (ATF) temperature sensor converts the ATF temperature into a resistance value which is input into the ECM.
The ECM applies a voltage to the temperature sensor through ECM terminal THO1.
The sensor resistance changes with the ATF temperature.
One terminal of the sensor is grounded so that the sensor resistance and voltage decrease as the temperature becomes higher.
The ECM calculates the ATF based on the voltage signal.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
P0710 |
|
|
|
P0712 |
No. 1 ATF temperature sensor resistance is less than 79 Ω for 0.5 sec. or more (1 trip detection logic) |
|
|
P0713 |
15 min. or more after the engine start, No. 1 ATF temperature sensor resistance is more than 156 kΩ for 0.5 sec. or more (1 trip detection logic) |
|
MONITOR DESCRIPTION
The ATF temperature sensor converts ATF temperature to an electrical resistance value. Based on the resistance, the ECM determines the ATF temperature, and the ECM detects an open or short in the ATF temperature circuit. If the resistance value of the ATF temperature is less than 79 Ω*1 or more than 156 kΩ*2, the ECM interprets this as a fault in the ATF sensor or wiring. The ECM will illuminate the MIL and store the DTC.
HINT:
- *1: 150°C (302°F) or more is indicated regardless of the actual ATF temperature.
- *2: -40°C (-40°F) is indicated regardless of the actual ATF temperature.
- The ATF temperature can be checked on the intelligent tester display.
MONITOR STRATEGY
|
Related DTCs |
P0710: ATF temperature sensor/Range check (Chattering) P0712: ATF temperature sensor/Range check (Low resistance) P0713: ATF temperature sensor/Range check (High resistance) |
|
Required sensors/Components |
ATF temperature sensor |
|
Frequency of operation |
Continuous |
|
Duration |
0.5 sec. |
|
MIL operation |
Immediate |
|
Sequence of operation |
None |
TYPICAL ENABLING CONDITIONS
All:
|
The monitor will run whenever the following DTCs are not present. |
None |
P0710, P0712: Range check (Chattering, Low resistance)
|
The typical enabling condition is not available. |
- |
P0713: Range check (High resistance)
|
Time after engine start |
15 min. or more |
TYPICAL MALFUNCTION THRESHOLDS
P0710: Range check (Chattering)
|
ATF temperature sensor resistance |
Less than 79 Ω or more than 156 kΩ |
P0712: Range check (Low resistance)
|
ATF temperature sensor resistance |
Less than 79 Ω |
P0713: Range check (High resistance)
|
ATF temperature sensor resistance |
More than 156 kΩ |
COMPONENT OPERATING RANGE
|
ATF temperature sensor resistance |
Atmospheric temperature to approx. 130°C (266°F) |
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Using the intelligent tester's DATA LIST allows switch, sensor, actuator and other item values to be read without removing any parts. Reading the DATA LIST early in troubleshooting is one way to save time.
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.
- Warm up the engine.
- Turn the ignition switch OFF.
- Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
- Turn the ignition switch ON.
- Turn the intelligent tester ON.
- Enter the following menus: DIAGNOSIS / OBD/MOBD / ECT / DATA LIST.
- Follow the instructions on the tester and read the DATA LIST.
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
A/T OIL TEMP1 |
ATF temperature sensor No. 1 value/ Min.: -40°C (-40°F) Max.: 215°C (419°F) |
|
If value is -40°C (-40°F) or 215°C (419°F), ATF temperature sensor No. 1 circuit is opened or short circuited |
HINT:
- When DTC P0712 is output and the intelligent tester output is 150°C (302°F) or more, there is a short circuit.
-
When DTC P0713 is output and the intelligent tester output is -40°C (-40°F), there is an open circuit.
Measure the resistance between terminal THO1 (OT) and the body ground.
|
Temperature Displayed |
Malfunction |
|---|---|
|
-40°C (-40°F) |
Open circuit |
|
150°C (302°F) or more |
Short circuit |
HINT:
If a circuit related to the ATF temperature sensor becomes open, P0713 is set in approximately 0.5 seconds. It is not necessary to inspect the circuit when P0711 is set.
PROCEDURE
|
1. |
INSPECT TRANSMISSION WIRE (ATF TEMPERATURE SENSOR) |
|
(a) Disconnect the E1 wire connector. |
|
(b) Measure the resistance of the transmission wire.
Standard resistance:
|
Tester Connection |
Specified Condition |
|---|---|
|
2 (OT-) - 10 (OT+) |
79 Ω to 156 kΩ |
|
2 (OT-) - Body ground |
1 MΩ or higher |
|
10 (OT+) - Body ground |
1 MΩ or higher |
HINT:
If the resistance is out of the specified range of either of the ATF temperatures shown in the table below, the driveability of the vehicle may decrease.
Standard resistance:
|
ATF Temperature |
Specified Condition |
|---|---|
|
20°C (68°F) |
3 to 4 kΩ |
|
110°C (230°F) |
0.22 to 0.28 kΩ |
| NG |
|
|
|
2. |
CHECK WIRE HARNESS (TRANSMISSION WIRE - ECM) |
|
(a) Disconnect the E7 and E8 ECM connectors. (b) Measure the resistance of the wire harness side connectors. Standard resistance:
|
|
| NG |
|
| OK |
|
|
|