METER / GAUGE SYSTEM Malfunction in Water Temperature Warning Light

DESCRIPTION

In this circuit, the combination meter assembly receives engine coolant temperature signals from the ECM using the CAN communication system. The combination meter assembly displays an engine coolant temperature warnings based on the data received from the ECM.

WIRING DIAGRAM


*1	Combination Meter Assembly (Meter Circuit Plate)
*2	CAN Communication Line

CAUTION / NOTICE / HINT

Tech Tips

If there is an open or short in the engine coolant temperature sensor circuit, the ECM stores DTCs. Troubleshoot the SFI system or ECD system.

SFI system for 1NR-FE: Click here

SFI system for 1ZR-FAE: Click here

SFI system for 2ZR-FE: Click here

SFI system for 1ZR-FE: Click here

SFI system for 8NR-FTS: Click here

ECD system for 1ND-TV: Click here

ECD system for 1WW: Click here
If the exhaust heat recirculation system has a malfunction, the engine coolant temperature hot warning light comes on to inform the driver of the malfunction.

PROCEDURE

CHECK CAN COMMUNICATION SYSTEM

Check if CAN communication DTCs are output.

w/ Central Gateway ECU: Click here

w/o Central Gateway ECU: Click here

Result

Result	Proceed to
CAN communication DTCs are not output.	A
CAN communication DTCs are output.	B

GO TO CAN COMMUNICATION SYSTEM w/ Central Gateway ECU: Click here
GO TO CAN COMMUNICATION SYSTEM w/o Central Gateway ECU: Click here

SYSTEM CHECK

Check the engine coolant temperature hot warning light.

Result

Result	Proceed to
Engine coolant temperature hot warning light does not come on.	A
Engine coolant temperature hot warning light remains on.	B

GO TO STEP 4 Click here

PERFORM ACTIVE TEST USING GTS (INDICAT. LAMP COOLANT HOT)

Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Body Electrical / Combination Meter / Active Test.

Perform the Active Test according to the display on the GTS.

Body Electrical > Combination Meter > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Indicat. Lamp Coolant Hot	Engine coolant temperature hot warning light	OFF or ON	-

Body Electrical > Combination Meter > Active Test

Tester Display
Indicat. Lamp Coolant Hot

OK
Engine coolant temperature hot warning light operation is normal.

Result

Proceed to
OK
NG

REPLACE COMBINATION METER ASSEMBLY for Hatchback, Wagon: Click here
REPLACE COMBINATION METER ASSEMBLY for Sedan: Click here

CHECK FOR DTC

Check if SFI system, ECD system or meter / gauge system DTCs are output.

SFI system for 1NR-FE: Click here

SFI system for 1ZR-FAE: Click here

SFI system for 2ZR-FE: Click here

SFI system for 1ZR-FE: Click here

SFI system for 8NR-FTS: Click here

ECD system for 1ND-TV: Click here

ECD system for 1WW: Click here

Meter / gauge system: Click here

Result

Result	Proceed to
DTCs are not output.	A
DTCs are output (for SFI system).	B
DTCs are output (for ECD system).	C
DTC B1503 is output.	D

GO TO SFI SYSTEM for 1NR-FE: Click here
GO TO SFI SYSTEM for 1ZR-FAE: Click here
GO TO SFI SYSTEM for 2ZR-FE: Click here
GO TO SFI SYSTEM for 1ZR-FE: Click here
GO TO SFI SYSTEM for 8NR-FTS: Click here

GO TO ECD SYSTEM for 1ND-TV: Click here
GO TO ECD SYSTEM for 1WW: Click here

GO TO METER / GAUGE SYSTEM Click here

READ VALUE USING GTS (COOLANT TEMP, COOLANT TEMPERATURE)

Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus:
1. for Engine and ECT: Powertrain / Engine and ECT / Data List.
2. for Combination Meter: Body Electrical / Combination Meter / Data List.

Read the Data List according to the display on the GTS.

Engine and ECT (for Gasoline)

Powertrain > Engine and ECT > Data List

Tester Display	Measurement Item	Range	Normal Condition	Reference Value	Diagnostic Note
Coolant Temp	Engine coolant temperature	Min.: -40°C (-40°F), Max.: 140°C (284°F)	75 to 100°C (167 to 212°F): After warming up	-	This is the engine coolant temperature. Tech Tips After warming up the engine, the engine coolant temperature is 75 to 100°C (167 to 212°F). After a long soak, the engine coolant temperature, intake air temperature and ambient temperature are approximately equal. If the value is -40°C (-40°F), or 140°C (284°F), the sensor circuit is open or shorted. Check if the engine overheats when the value indicates 140°C (284°F).

Powertrain > Engine and ECT > Data List

Tester Display
Coolant Temp

Engine and ECT (for Diesel)

Powertrain > Engine and ECT > Data List

Tester Display	Measurement Item	Type	Range	Normal Condition	Reference Value	Diagnostic Note
Coolant Temp	Engine coolant temperature	for 1ND-TV: Sensor output (engine coolant temperature sensor) for 1WW: -	for 1ND-TV: Min.: -40°C, Max.: 140°C for 1WW: Min.: -40°C, Max.: 215°C	for 1ND-TV: After warming up engine: 75 to 100°C (167 to 212°F) for 1WW: After warming up engine: 75 to 90°C (167 to 194°F)	for 1ND-TV: After warming up engine: 75°C (167°F) for 1WW: -	for 1ND-TV: After a long soak, the coolant temperature, intake air temperature, and ambient air temperature are approximately equal. If the value is -30°C (-22°F) or less, or 120°C (248°F) or higher, the sensor circuit is open or shorted. Cause of Out of Range: Engine coolant temperature sensor Symptoms when out of range: Difficult starting when engine is cold, rough idle, black smoke, lack of power for 1WW: -

Tester Display

Measurement Item

Type

Range

Normal Condition

Reference Value

Diagnostic Note

Coolant Temp

Engine coolant temperature

for 1ND-TV:

Sensor output (engine coolant temperature sensor)

for 1WW:

for 1ND-TV:

Min.: -40°C, Max.: 140°C

for 1WW:

Min.: -40°C, Max.: 215°C

for 1ND-TV:

After warming up engine: 75 to 100°C (167 to 212°F)

for 1WW:

After warming up engine: 75 to 90°C (167 to 194°F)

for 1ND-TV:

After warming up engine: 75°C (167°F)

for 1WW:

for 1ND-TV:

After a long soak, the coolant temperature, intake air temperature, and ambient air temperature are approximately equal.
If the value is -30°C (-22°F) or less, or 120°C (248°F) or higher, the sensor circuit is open or shorted.

Cause of Out of Range:

Engine coolant temperature sensor

Symptoms when out of range:

Difficult starting when engine is cold, rough idle, black smoke, lack of power

for 1WW:

Powertrain > Engine and ECT > Data List

Tester Display
Coolant Temp

Combination Meter

Body Electrical > Combination Meter > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Coolant Temperature	Engine coolant temperature	Min.: 0°C (32°F), Max.: 127.5°C (261.5°F)	except 1WW: 75 to 100 °C (167 to 212°F): After warming up engine for 1WW: 75 to 90°C (167 to 194°F): After warming up engine	-

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Coolant Temperature

Engine coolant temperature

Min.: 0°C (32°F), Max.: 127.5°C (261.5°F)

except 1WW:

75 to 100 °C (167 to 212°F): After warming up engine

for 1WW:

75 to 90°C (167 to 194°F): After warming up engine

Body Electrical > Combination Meter > Data List

Tester Display
Coolant Temperature

Result

Result	Proceed to
The data List values of the ECUs do not match.	A
The data List values of the ECUs match.	B

Tech Tips

When the Data List values of the ECUs match, an internal malfunction of the ECM is suspected.
When the Data List values of the ECUs do not match, a signal output error of the ECM or an internal malfunction of the combination meter assembly is suspected.

REPLACE ECM for 1NR-FE: Click here
REPLACE ECM for 1ZR-FAE: Click here
REPLACE ECM for 2ZR-FE: Click here
REPLACE ECM for 1ZR-FE: Click here
REPLACE ECM for 8NR-FTS: Click here
REPLACE ECM for 1ND-TV: Click here
REPLACE ECM for 1WW: Click here

REPLACE COMBINATION METER ASSEMBLY

Replace the combination meter assembly with a new or known good one.

for Hatchback, Wagon: Click here

for Sedan: Click here

OK
The operation of the engine coolant temperature hot warning light returns to normal.

Result

Proceed to
OK
NG

END