Dtc P0712 Transmission Fluid Temperature Sensor A Circuit Low Input

Drivetrain. Land Cruiser. Urj200, 202 Grj200 Vdj200
Ae80F Automatic Transmission Transaxle. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING GTS (A/T OIL TEMPERATURE 1)

CHECK HARNESS AND CONNECTOR (NO. 1 ATF TEMPERATURE SENSOR - TCM)

CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - TCM)

DTC P0712 Transmission Fluid Temperature Sensor "A" Circuit Low Input

DTC P0713 Transmission Fluid Temperature Sensor "A" Circuit High Input


DESCRIPTION

Refer to DTC P0711 (Click here).

DTC No.
DTC Detection Condition
  1. Diagnosis Condition
  2. Malfunction Status
  3. Malfunction Time
  4. Other
Trouble Area
P0712
  1. The battery voltage is 9.5 V or higher.
  2. No. 1 ATF temperature sensor voltage is below 0.08 V
  3. 60 seconds
  4. 1-trip detection logic
  1. Short in No. 1 ATF temperature sensor circuit
  2. No. 1 ATF temperature sensor (transmission wire)
  3. TCM
P0713
  1. The battery voltage is 9.5 V or higher, engine speed is more than 400 rpm and shift lever in D.
  2. No. 1 ATF temperature sensor voltage is higher than 4.94 V
  3. 12 seconds
  4. 1-trip detection logic
  1. Open in No. 1 ATF temperature sensor circuit
  2. No. 1 ATF temperature sensor (transmission wire)
  3. TCM

MONITOR DESCRIPTION

The No. 1 ATF temperature sensor converts the ATF temperature to an electrical resistance value. Based on the resistance, the TCM determines the ATF temperature and detects an open or short in the No. 1 ATF temperature sensor circuit. If the resistance value of the No. 1 ATF temperature sensor is below 79 Ω*1 or higher than 156 kΩ*2, the TCM interprets this as a fault in the No. 1 ATF temperature sensor or wiring. The TCM will illuminate the MIL and store the DTC.
HINT:
  1. *1: 171°C (339.8°F) or higher is indicated regardless of the actual ATF temperature.
  2. *2: -40°C (-40°F) is indicated regardless of the actual ATF temperature.
  3. The ATF temperature can be checked on the GTS display.

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Ae80F Automatic Transmission Transaxle.Automatic Transmission System. Dtc P0712 Transmission Fluid Temperature Sensor A Circuit Low Input


INSPECTION PROCEDURE

NOTICE:
Perform registration and/or initialization when parts related to the automatic transmission are replaced (Click here).
HINT:
After performing repair, clear the DTCs and perform the following procedure to check that DTCs are not output.
  1. Start the engine.
  2. Wait for 60 seconds or more with the shift lever in D.
  3. Check for DTCs again (Click here).

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 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.

  1. Warm up the engine.

  2. Turn the engine switch off.

  3. Connect the GTS to the DLC3.

  4. Turn the engine switch on (IG).

  5. Turn the GTS on.

  6. Enter the following menus: Powertrain / ECT / Data List / A/T Oil Temperature 1.

  7. According to the display on the GTS, read the Data List.

    ECT
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    A/T Oil Temperature 1
    		No. 1 ATF temperature sensor value/
    Min.: -40°C (-40°F)
    Max.: 171°C (339.8°F)
    1. After stall speed test: Approximately 80°C (176°F)
    2. While engine is cold: Equal to ambient temperature
    		If value is -40°C (-40°F) or 171°C (339.8°F), No. 1 ATF temperature sensor circuit is open or short circuited.
    HINT:
    1. When DTC P0712 is output and the GTS shows 171°C (339.8°F) or higher, there is a short circuit.
    2. When DTC P0713 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 or short circuit
    171°C (339.8°F) or higher
    		Short circuit
    HINT:
    If a circuit related to the No. 1 ATF temperature sensor becomes open, P0713 will be stored in approximately 0.5 seconds. It is not necessary to inspect the circuit when P0711 is output.
1.READ VALUE USING GTS (A/T OIL TEMPERATURE 1)

  1. Warm up the engine.

  1. Turn the engine switch off.

  1. Connect the GTS to the DLC3.

  1. Turn the engine switch on (IG).

  1. Turn the GTS on.

  1. Enter the following menus: Powertrain / ECT / Data List / A/T Oil Temperature 1.

  1. According to the display on the GTS, read the Data List.

    ECT
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    A/T Oil Temperature 1
    		No. 1 ATF temperature sensor value/
    Min.: -40°C (-40°F)
    Max.: 171°C (339.8°F)
    1. After stall speed test: Approximately 80°C (176°F)
    2. While engine is cold: Equal to ambient temperature
    		If value is -40°C (-40°F) or 171°C (339.8°F), No. 1 ATF temperature sensor circuit is open or short circuited

    Result
    Result
    		Proceed to
    Data List value is not within the normal condition
    		A
    Data List value is within the normal condition
    		B


B
REPLACE TCM (Click here)
A


2.CHECK HARNESS AND CONNECTOR (NO. 1 ATF TEMPERATURE SENSOR - TCM)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Ae80F Automatic Transmission Transaxle.Automatic Transmission System. Dtc P0712 Transmission Fluid Temperature Sensor A Circuit Low Input

  1. Disconnect the TCM connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A80-23 (THO1) - A80-24 (E2)
    		Always
    		79 Ω to 156 kΩ
    A80-23 (THO1) - Body ground
    		Always
    		10 kΩ or higher
    A80-24 (E2) - 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
Text in Illustration
*a
Rear view of wire harness connector
(to TCM)


NG
Go to step 3
OK

REPLACE TCM (Click here)

3.CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - TCM)

  1. Disconnect the C171 transmission wire connector.

  1. Disconnect the A80 TCM connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    C171-1 (OT+) - A80-23 (THO1)
    		Always
    		Below 1 Ω
    C171-2 (OT-) - A80-24 (E2)
    		Always
    		Below 1 Ω
    C171-1 (OT+) or A80-23 (THO1) - Body ground
    		Always
    		10 kΩ or higher
    C171-2 (OT-) or A80-24 (E2) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE NO. 1 ATF TEMPERATURE SENSOR (TRANSMISSION WIRE) (Click here)