Toyota Tacoma (2015-2018) Service Manual: Transmission Fluid Temperature Sensor "A" Circuit Range/Performance (P071000)

Toyota Tacoma (2015-2018) Service Manual / Ac60e Automatic Transmission / Transaxle / Automatic Transmission System(for 2gr-fks) / Transmission Fluid Temperature Sensor "A" Circuit Range/Performance (P071000)

DESCRIPTION

The No. 1 ATF temperature sensor converts the fluid temperature into a resistance value for use by the ECM.

The ECM applies a voltage to the temperature sensor through terminal THO1 of the ECM.

The sensor resistance changes with the ATF temperature. As the temperature becomes higher, the sensor resistance decreases.

One terminal of the sensor is grounded so that the sensor resistance decreases and the voltage goes down as the temperature becomes higher.

The ECM calculates the fluid temperature based on the voltage signal.

DTC No.	DTC Detection Condition	Trouble Area	SAE
P071000	Either condition is met: (2 trip detection logic) (a) Certain monitor enabling conditions are met and the No. 1 ATF temperature is below 20°C (68°F) (b) Certain monitor enabling conditions are met and the No. 1 ATF temperature is 110°C (230°F) or higher	No. 1 ATF temperature sensor (transmission wire)	P0711

MONITOR DESCRIPTION

This DTC indicates that there is a problem with output signals from the No. 1 ATF temperature sensor and that the sensor itself is defective. The No. 1 ATF temperature sensor converts the ATF temperature into an electrical resistance value. Based on the resistance, the ECM determines the ATF temperature and detects an open or short in the No. 1 ATF temperature sensor circuit or a fault of the No. 1 ATF temperature sensor.

After running the vehicle for a certain period, the ATF temperature should increase. If the ATF temperature is below 20°C (68°F) after running the vehicle for a certain period, the ECM interprets this as a malfunction, illuminates the MIL and stores the DTC.

When the ATF temperature is 110°C (230°F) or higher and the engine coolant temperature takes 10 seconds or more to reach 60°C (140°F) after a cold start, the ECM also determines this as a malfunction, illuminates the MIL and stores the DTC.

MONITOR STRATEGY

Related DTCs	P0711: ATF temperature sensor/Rationality fault diagnostics
Required sensors/Components	ATF temperature sensor (TFT sensor)
Frequency of operation	Continuous
Duration	Condition (A), (B), (C) and (D): 3 sec. Condition (E): Continuous
MIL operation	2 driving cycles
Sequence of operation	None

TYPICAL ENABLING CONDITIONS

All:

The monitor will run whenever the following DTCs are not stored	P0712, P0713 (TFT (ATF temperature) sensor circuit) P0115, P0117, P0118 (ECT (Engine coolant temperature) sensor circuit) P0112, P0113 (IAT (Intake air temperature) sensor circuit) P0717, P07BF, P07C0 (Turbine speed sensor circuit) P0722, P077C, P077D (Output speed sensor circuit) P0335 (Crankshaft position sensor circuit (This condition applies only if using fail-safe)) P0748 (Shift solenoid valve SL1 circuit) P0778 (Shift solenoid valve SL2 circuit) P0798 (Shift solenoid valve SL3 circuit) P2810 (Shift solenoid valve SL4 circuit) P0327, P0328, P0332, P0333 (KCS (Knock control sensor) circuit) P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0604, P0606, P060A, P060B, P060D, P060E, P0657, P1607, P2102, P2103, P2111, P2112, P2118, P2119, P2135 (ETCS (Electronic throttle control system)) U0100 (CAN communication system) P2610 (Soak timer circuit)
TFT (ATF temperature) sensor circuit	Not circuit malfunction
ECT (Engine coolant temperature) sensor circuit	Not circuit malfunction
IAT (Intake air temperature) sensor circuit	Not circuit malfunction
Turbine speed sensor circuit	Not circuit malfunction
Output speed sensor	Not circuit malfunction
Shift solenoid valve SL1 circuit	Not circuit malfunction
Shift solenoid valve SL2 circuit	Not circuit malfunction
Shift solenoid valve SL3 circuit	Not circuit malfunction
Shift solenoid valve SL4 circuit	Not circuit malfunction
KCS (Knock control sensor) circuit	Not circuit malfunction
ETCS (Electronic throttle control system)	Not system down
CAN communication system	Not system down
Soak timer circuit	Not circuit malfunction

Condition (A):

Duration time from engine start	12 sec. or more
ECT	-15°C (5°F) or higher
Time after engine start except for continuing shift position "N" or "P"*2	10 min. or more
Accumulated driving time*1	100 sec. or more
Driving distance after engine start*3	4.9 km (3.0 miles) or more
IAT*4	15°C (59°F) or higher
ECT (12 sec. after engine start)	15°C (59°F) or higher
Soak time	5 hours or more

Condition (B):

Duration time from engine start	12 sec. or more
ECT	-15°C (5°F) or higher
Time after engine start except for continuing shift position "N" or "P"*2	21 min. and 40 sec. or more
Accumulated driving time*1	200 sec. or more
Driving distance after engine start*3	9 km (5.6 miles) or more
IAT*4	-10°C (14°F) or higher
ECT (12 sec. after engine start)	-10°C (14°F) or higher

Condition (C):

Duration time from engine start	12 sec. or more
ECT	-15°C (5°F) or higher
Time after engine start except for continuing shift position "N" or "P"*2	30 min. or more
Accumulated driving time*1	400 sec. or more
Driving distance after engine start*3	16 km (9.9 miles) or more
IAT*4	-15°C (5°F) or higher
ECT (12 sec. after engine start)	-15°C (5°F) or higher

Condition (D):

Duration time from engine start	12 sec. or more
ECT	-15°C (5°F) or higher
Time after engine start except for continuing shift position "N" or "P"*2	55 min. or more
Accumulated driving time*1	750 sec. or more
Driving distance after engine start*3	27 km (16.8 miles) or more

Condition (E):

Time after ECT reaches 60°C (140°F)	10 sec. or more
ATF temperature (12 sec. after engine start)	110°C (230°F) or higher
ECT (12 sec. after engine start)	Below 35°C (95°F)

HINT:

*1: Following conditions are met

Engine speed - Turbine speed	50 rpm or more
Output speed	400 rpm or more
Throttle valve opening angle	3% or more
Shift position	Not "N" or "P"
Engine	Running
However, accumulated driving time is cleared	-
When following condition met	-
Duration time from shifting to "N" or "P"	300 sec. or more

*2: Time after engine start is cleared when following condition met

Duration time from shifting to "N" or "P"

300 sec. or more

*3: Driving distance is cleared when following condition met

Duration time from shifting to "N" or "P"

300 sec. or more

*4: IAT is measured when either of following conditions met

12 sec. after engine start	-
Duration time from shifting to "N" or "P"	300 sec. or more

TYPICAL MALFUNCTION THRESHOLDS

When either condition below is met: Condition (A), (B), (C) and (D) or (E)

Condition (A), (B), (C) and (D):

ATF temperature

Below 20°C (68°F)

Condition (E):

ATF temperature

110°C (230°F) or higher

COMPONENT OPERATING RANGE

ATF temperature

20°C (68°F) or higher, and Below 110°C (230°F)

CONFIRMATION DRIVING PATTERN

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

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 (See page ).

Connect the Techstream to the DLC3.
Turn the ignition switch to ON and turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 5 hours. [*1]
Turn the ignition switch to ON and turn the Techstream on. [*2]
Start the engine and perform both of the following [*3]:
- Drive the vehicle 27 km (16.8 miles) or more over a period of 12 minutes and 30 seconds or more.
- Wait until 55 minutes or more have elapsed since the engine started.
  HINT:
  
  [*1] to [*3] : Normal judgment procedure.
  
  The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
Stop the vehicle.
Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
Input the DTC: P071000.

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.

CAUTION / NOTICE / HINT

NOTICE:

Perform the universal trip to clear permanent DTCs (See page ).
Perform registration and/or initialization when parts related to the automatic transmission are replaced (See page ).

1. DATA LIST

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.

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.

(a) Warm up the engine.

(b) Turn the ignition switch off.

(d) Turn the ignition switch to ON.

(e) Turn the Techstream on.

(f) Enter the following menus: Powertrain / Transmission / Data List.

(g) According to the display on the Techstream, read the Data List.

Transmission

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
A/T Oil Temperature No. 1	No. 1 ATF temperature sensor value/ Min.: -40°C (-40°F) Max.: 150°C (302°F)	Approx. 80°C (176°F): After stall test Equal to ambient temperature when cold soak	If the value -40°C (-40°F) or 150°C (302°F), No. 1 ATF temperature sensor circuit is open or shorted.

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

A/T Oil Temperature No. 1

No. 1 ATF temperature sensor value/

Min.: -40°C (-40°F)

Max.: 150°C (302°F)

Approx. 80°C (176°F): After stall test
Equal to ambient temperature when cold soak

If the value -40°C (-40°F) or 150°C (302°F), No. 1 ATF temperature sensor circuit is open or shorted.

HINT:

When DTC P071011 is output and the Techstream indicates 150°C (302°F) or higher, there is a short circuit.

When DTC P071015 is output and the Techstream indicates -40°C (-40°F), there is an open circuit.

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

HINT:

If a circuit related to the No. 1 ATF temperature sensor becomes open, P071015 is immediately stored (in 0.5 seconds). When P071015 is stored, P071000 cannot be stored.

It is not necessary to inspect the circuit when P071000 is stored.

PROCEDURE

1.	CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P071000)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Powertrain / Transmission / Trouble Codes.

(e) Read the DTCs using the Techstream.

Result

Result	Proceed to
Only DTC P071000 is output	A
P071000 and other DTCs are output	B

HINT:

If any other codes besides P071000 are output, perform troubleshooting for those DTCs first.

GO TO DTC CHART

2.	CHECK TRANSMISSION FLUID LEVEL

(a) Check the transmission fluid level (See page OK: ).

OK:

Automatic transmission fluid level is correct.

REPLACE NO. 1 ATF TEMPERATURE SENSOR (TRANSMISSION WIRE)

ADJUST FLUID LEVEL

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