P0712
A750E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM (for 1GR-FE): P0712: Transmission Fluid Temperature Sensor "A" Circuit Low Input
DTC P0712 - Transmission Fluid Temperature Sensor "A" Circuit Low Input
DTC P0713 - Transmission Fluid Temperature Sensor "A" Circuit High Input
DESCRIPTION
The ATF (Automatic Transmission Fluid) 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 temperature based on the voltage signal.
MONITOR DESCRIPTION
The ATF temperature sensor converts the ATF temperature to an electrical resistance value. Based on the resistance, the ECM determines the ATF temperature and detects an open or short in the ATF temperature sensor circuit. If the resistance value of the ATF temperature sensor is less than 79 Ohms*1 or more than 156 kOhms*2, the ECM interprets this as a fault in the ATF temperature 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 Techstream display.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
P0712: Range check (Low resistance)
P0713: Range check (High resistance)
- One of the following conditions is met: Condition (A) or (B)
Condition (A)
TYPICAL MALFUNCTION THRESHOLDS
P0712: Range check (Low resistance)
P0713: Range check (High resistance)
COMPONENT OPERATING RANGE
WIRING DIAGRAM
INSPECTION PROCEDURE
1. DATA LIST
HINT: According to the Data List displayed by Techstream, you can read the values of switches, sensors, actuators and so on without removing parts. Reading the Data List as the first step of troubleshooting is one method to save time.
NOTE: 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.
(a) Warm up the engine.
(b) Turn the ignition switch OFF.
(c) Connect Techstream to the DLC3.
(d) Turn the ignition switch ON, and turn the tester main switch ON.
(e) Enter the following menus: Powertrain / Engine and ECT / Data List.
(f) According to the display on tester, read the "Data List".
Engine and ECT
HINT:
When DTC P0712 is output and Techstream output is 150°C (302°F) or more, there is a short circuit.
When DTC P0713 is output and Techstream output is -40°C (-40°F), there is an open circuit.
Check the temperature displayed on the tester in order to check if a malfunction exists.
HINT: If a circuit related to the ATF temperature sensor becomes open, P0713 is immediately set (in 0.5 seconds). When P0713 is set, P0711 cannot be detected.
It is not necessary to inspect the circuit when P0711 is set.
PROCEDURE
1. INSPECT TRANSMISSION WIRE (ATF TEMPERATURE SENSOR)
(a) Disconnect the transmission wire connector from the transmission.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
HINT: If the resistance is out of the specified range at either of the ATF temperatures shown in the table below, the driveability of the vehicle may decrease.
Standard resistance:
NG -- REPAIR OR REPLACE TRANSMISSION WIRE
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)
(a) Connect the transmission wire connector to the transmission.
(b) Disconnect the ECM connectors.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
(d) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for short):
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM