Toyota 4Runner: Engine Coolant Temperature Receiver Gauge Malfunction

Toyota 4Runner Service Manual / Vehicle Interior / Meter / Gauge / Display / Meter / Gauge System / Engine Coolant Temperature Receiver Gauge Malfunction

DESCRIPTION

In this circuit, the meter CPU receives engine coolant temperature signals from the ECM using the CAN communication system. The meter CPU displays the engine coolant temperature, which is calculated based on the data received from the ECM.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

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

PROCEDURE

1.	CHECK CAN COMMUNICATION SYSTEM

(a) Check if a CAN communication DTC is output (See page ).

Result

Result	Proceed to
CAN communication DTC is not output	A
CAN communication DTC is output	B

GO TO CAN COMMUNICATION SYSTEM

2.	PERFORM ACTIVE TEST USING TECHSTREAM (WATER TEMPERATURE METER OPERATION)

(a) Operate the Techstream according to the display and select the Active Test (See page ).

Combination Meter

Tester Display	Test Part	Control Range	Diagnostic Note
Water Temperature Meter Operation	Engine coolant temperature receiver gauge	Low, Normal, High	Confirm that the vehicle is stopped with the engine idling.

OK:

Engine coolant temperature receiver gauge indication is normal.

REPLACE COMBINATION METER ASSEMBLY

3.	READ VALUE USING TECHSTREAM (COOLANT TEMPERATURE)

(a) Operate the Techstream according to the display and select the Data List (See page ).

Combination Meter

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Coolant Temperature	Engine coolant temperature/16 to 127°C (60.8 to 260.6°F)	After warming up: 80 to 95°C (176 to 203°F)	If the value is -40°C (-40°F), the sensor is circuit open. If the value is 140°C (284°F) or more, the sensor circuit is shorted.

OK:

Engine coolant temperature value displayed on the Techstream is almost the same as the engine coolant temperature receiver gauge indication.

(b) Record the temperature displayed on the Techstream.

REPLACE COMBINATION METER ASSEMBLY

4.	READ VALUE USING TECHSTREAM (COOLANT TEMP)

(a) Operate the Techstream according to the display and select the Data List (See page ).

Engine and ECT

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Coolant Temp	Engine coolant temperature/Min.: -40°C (-40°F), Max.: 215°C (419°F)	After warming up: 80 to 100°C (176 to 212°F)	If the value is -40°C (-40°F), the sensor is circuit open. If the value is 140°C (284°F) or more, the sensor circuit is shorted.

OK:

Engine coolant temperature value displayed on the Techstream is almost the same as the previously recorded Techstream indication (Body Electrical / Combination Meter / Data List / Coolant Temperature).

REPLACE COMBINATION METER ASSEMBLY

REPLACE ECM

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