Toyota Tundra. Manual — part 1530

Fig. 80: Identifying Terminals Of D28 ECT Sensor Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Connect terminals 1 and 2 of the ECT sensor connector on the wire harness side.

c. Connect the Techstream to the DLC3.

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

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/Coolant Temp.

g. Read the value displayed on the Techstream.

Standard value: 140°C (284°F) or higher

NG: Go to step 4

OK: CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE ENGINE
COOLANT TEMPERATURE SENSOR (See REMOVAL )

4. CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR -

ECM)

a. Disconnect the D28 ECT sensor connector.

Fig. 81: Identifying Terminals Of D28 ECT And D74 ECM Sensor Connectors
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Disconnect the D74 ECM connector.

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

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

Standard resistance

RESISTANCE SPECIFIED CONDITION

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: GOOD CONNECTION TO ECM. IF OK, REPLACE ECM (See REMOVAL )

5. READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN WIRE HARNESS)

a. Disconnect the D28 ECT sensor connector.

Fig. 82: Identifying D28 ECT Sensor Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Connect the Techstream to the DLC3.

c. Turn the ignition switch to ON.

d. Turn the Techstream ON.

e. Enter the following menus: Powertrain/Engine and ECT/Data List/All Data/Coolant Temp.

f. Read the value displayed on the Techstream.

Standard value: -40°C (-40°F)

NG: Go to step 6

OK: REPLACE ENGINE COOLANT TEMPERATURE SENSOR (See REMOVAL )

6. CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR -

ECM)

a. Disconnect the D28 ECT sensor connector.

Tester Connection

Condition Specified Condition

D28-2 - D74-76 (THW)

Always

Below 1 ohms

D28-1 - D74-98 (ETHA) Always

Below 1 ohms

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

Fig. 83: Identifying Terminals Of D28 ECT And D74 ECM Sensor Connectors
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Disconnect the D74 ECM connector.

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

Standard resistance

RESISTANCE SPECIFIED CONDITION

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE ECM (See REMOVAL )

DTC P0116 ENGINE COOLANT TEMPERATURE CIRCUIT RANGE/PERFORMANCE PROBLEM

DESCRIPTION

Refer to DTC P0115 .

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART

Tester Connection

Condition Specified Condition

D28-2 or D74-76 (THW) - Body ground Always

10 kohms or higher

DTC

DTC Detection Condition

Trouble Area

P0116

When either of following
conditions met (2 trip detection
logic):



When cold engine started
and engine warmed up,
Engine Coolant Temperature
(ECT) sensor value does not
change.



After warmed up engine
stopped and then next cold
engine start performed, ECT



Thermostat



ECT sensor

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra