P0712
U340E AUTOMATIC TRANSAXLE: AUTOMATIC TRANSAXLE SYSTEM: P0710: Transmission Fluid Temperature Sensor "A" Circuit
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 ATF (Automatic Transmission Fluid) temperature sensor converts the fluid temperature into a resistance value which is input to the ECM.
The sensor resistance changes with the transmission fluid temperature. As the temperature rises, the sensor resistance decreases. The ECM applies a voltage to the temperature sensor through ECM terminal THO1, and the ECM calculates the fluid temperature based on the voltage signal.
HINT:
- The ATF temperature is likely to increase under conditions such as towing, climbing hills and in heavy traffic.
- When the ATF temperature sensor is normal, the transmission locks up in 4th gear with the shift lever in the D position and in 3rd gear with the shift lever in the 3rd position.
- *: Only for Mexico models
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 opens or shorts in the ATF temperature circuit. If the resistance value of the ATF temperature is less than 79 Ohms*1 or more than 156 kOhms*2, the ECM interprets this as a fault in the ATF sensor or wiring. The ECM turns on the MIL and stores the DTC.
*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.
HINT: The ATF temperature can be checked on the Techstream display.
MONITOR STRATEGY
*1: Transmission Fluid Temperature
TYPICAL ENABLING CONDITIONS
P0712: Range check (Low resistance)
P0713: Range check (High resistance)
TYPICAL MALFUNCTION THRESHOLDS
P0712: Range check (Low resistance)
P0713: Range check (High resistance)
COMPONENT OPERATING RANGE
WIRING DIAGRAM
INSPECTION PROCEDURE
1. DATA LIST
HINT: Using the Data List displayed by the Techstream, you can read the values of the switches, sensors, actuators and so on without parts removal. Reading the Data List as the first step of troubleshooting is one method of shortening labor 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 the Techstream to the DLC3.
(d) Turn the ignition switch to ON.
(e) Turn the Techstream on.
(f) Enter the following menus: Powertrain / Engine and ECT / Data List / All Data.
(g) In accordance with the display on the Techstream, read the Data List.
HINT: When DTC P0712 is output and the Techstream reading is 150°C (302°F) or more, there is a short circuit.
When DTC P0713 is output and the Techstream reading is -40°C (-40°F), there is an open circuit.
Measure the resistance between terminal THO1 and the body ground.
HINT: If a circuit related to the ATF (Automatic Transmission Fluid) temperature sensor becomes open, P0713 is immediately set (within 0.5 seconds).
PROCEDURE
1. INSPECT TRANSMISSION WIRE (ATF TEMPERATURE SENSOR)
(a) Disconnect the transmission wire connector from the transaxle.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
HINT: If the resistance is outside the specified range at either of the ATF temperatures shown in the table below, the driveability of the vehicle may be affected.
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 transaxle.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM