Toyota Tundra (2015 year). Manual — part 1125

MONITOR DESCRIPTION

The Engine Coolant Temperature (ECT) sensor is used to monitor the ECT. The ECT sensor has a thermistor with

in resistance are reflected in the output voltage from the sensor. The ECM monitors the sensor voltage and uses

this value to calculate the ECT. When the sensor output voltage deviates from the normal operating range, the

ECM interprets this as a fault in the ECT sensor and stores a DTC.

Example:

If the sensor output voltage is more than 4.91 V for 0.5 seconds or more, the ECM determines that there is an

open in the ECT sensor circuit, and stores DTC P0118. Conversely, if the voltage output is less than 0.14 V for 0.5

seconds or more, the ECM determines that there is a short in the sensor circuit, and stores DTC P0117.

If the malfunction is not repaired successfully, a DTC is stored 0.5 seconds after the engine is next started.

MONITOR STRATEGY

Related DTCs

P0115: ECT sensor range check (Fluctuating)

P0117: ECT sensor range check (Low voltage)

P0118: ECT sensor range check (High voltage)

Required Sensors/Components (Main)

ECT sensor

Required Sensors/Components (Related)

-

Duration

0.5 seconds

MIL Operation

Immediate

TYPICAL ENABLING CONDITIONS

Monitor runs whenever following DTCs not present

None

TYPICAL MALFUNCTION THRESHOLDS

P0115

ECT sensor

voltage

Less than 0.14 V, or more than 4.91 V [More than 135°C (275°F), or less than -60°C

(-76°F)]

P0117

ECT sensor voltage [ECT]

Less than 0.14 V [More than 135°C (275°F)]

P0118

ECT sensor voltage [ECT]

More than 4.91 V [Less than -60°C (-76°F)]

COMPONENT OPERATING RANGE

1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0115,P0117,...

ECT sensor voltage [ECT]

0.14 to 4.91 V [-60 to 135°C (-76 to 275°F)]

CONFIRMATION DRIVING PATTERN

Connect the Techstream to the DLC3.

1.

Turn the ignition switch to ON and turn the Techstream on.

2.

Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).

3.

Turn the ignition switch off and wait for at least 30 seconds.

4.

Turn the ignition switch to ON and turn the Techstream on.

5.

Wait 0.5 seconds or more.

6.

Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

7.

Read the pending DTCs.

HINT:

If a pending DTC is output, the system is malfunctioning.
If a pending DTC is not output, perform the following procedure.

8.

Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

9.

Input the DTC: P0115, P0117 or P0118.

10.

Check the DTC judgment result.

TESTER

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

11.

If the test result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and

check for permanent DTCs

.

HINT:

If a permanent DTC is output, the system is malfunctioning.
If no permanent DTC is output, the system is normal.

12.

WIRING DIAGRAM

1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0115,P0117,...

INSPECTION PROCEDURE

HINT:

Read freeze frame data using the Techstream. Freeze frame data records the engine condition when

malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was
moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other
data from the time the malfunction occurred.

PROCEDURE

1.

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 / Coolant Temp.

(e) Read the value displayed on the Techstream.

Standard value:

Between 75 and 100°C (167 and 212°F) with warm engine.

Result

RESULT

PROCEED TO

-40°C (-40°F)

A

140°C (284°F) or higher

B

Between 75 and 100°C (167 and 212°F)

C

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 4

1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0115,P0117,...

A

C

CHECK FOR INTERMITTENT PROBLEMS

2.

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

(a) Disconnect the ECT sensor connector.

(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 / Coolant Temp.

(g) Read the value displayed on the Techstream.

Standard value:

140°C (284°F) or higher

HINT:

Perform "Inspection After Repair" after replacing the engine

coolant temperature sensor

.

NG

GO TO STEP 3

OK

CONFIRM GOOD CONNECTION TO SENSOR. IF OK,

REPLACE ENGINE COOLANT TEMPERATURE

SENSOR

3.

CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)

1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0115,P0117,...