Toyota Tundra. Manual — part 1344

B : Go to step 5

C : Go to step 3

A : Go To Next Step

2. READ VALUE USING TECHSTREAM (ENGINE COOLANT TEMPERATURE)

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON.

c. Turn the Techstream ON.

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

e. Read the value displayed on the Techstream.

Standard value:

Between 80 and 100°C (167 and 212°F) with warm engine.

Result

RESULT REFERENCE

HINT:



If there is an open circuit, the Techstream indicates 40°C (-40°F).



If there is a short circuit, the Techstream indicates 140°C (284°F) or higher.

B : Go to step 5

C : CHECK FOR INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT
PROBLEMS )

A : Go To Next Step

3. READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN WIRE HARNESS)

a. Disconnect the D28 ECT sensor connector.

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

c. Connect the Techstream to the DLC3.

P0117 is output

B

P0118 is output

C

Result

Proceed To

-40°C (-40°F)

A

140°C (284°F) or higher

B

Between 80 and 100°C (176 and 212°F)

C

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - 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.

Fig. 71: Connecting Terminals 1 & 2 Of ECT Sensor Connector On Wire Harness Side

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.

b. Disconnect the D74 ECM connector.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection

Condition Specified Condition

D28-2 - D74-76 (THW)

Always

Below 1 ohms

D28-1 - D74-97 (ETHW) Always

Below 1 ohms

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

Fig. 72: Identifying D28 ECT Sensor & D74 ECM Connectors

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.

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)

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

Fig. 73: D28 ECT Sensor & ECM Circuit Diagram

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.

b. Disconnect the D74 ECM connector.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection

Condition Specified Condition

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

10 kohms or higher

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra