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 (CAN No. 1 Bus). The meter CPU displays engine coolant temperature that is calculated based on the data received from the ECM.

WIRING DIAGRAM

1. for 2GR-FE

2. for 1AR-FE

CAUTION / NOTICE / HINT

HINT:

If there is an open or short in the engine coolant temperature sensor circuit, the ECM stores the DTCs. Refer to troubleshoot SFI System (See page for 2GR-FE,
for 1AR-FE).

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM

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

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

B

GO TO CAN COMMUNICATION SYSTEM

A

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

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Combination Meter / Active Test.

(e) Check the operation by referring to the table below.

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.

NG

REPLACE COMBINATION METER ASSEMBLY

OK

1. READ VALUE USING TECHSTREAM (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: Body Electrical / Combination Meter / Data List.

(e) Check the values by referring to the table below.

Combination Meter

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Coolant Temperature	Engine coolant temperature/Min.: 0 °C, Max.: 128 °C	After warming up: 80 to 100 °C	If -40°C (-40°F): Sensor circuit open If 140 °C or more: Sensor circuit shorted

OK:

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

NG

REPLACE COMBINATION METER ASSEMBLY

OK

1. READ VALUE USING TECHSTREAM (COOLANT TEMP)

(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.

(e) Check the values by referring to the table below.

Engine and ECT (for 2GR-FE)

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Engine Speed	Vehicle speed/Min.: 0 rpm, Max.: 16383 rpm	600 to 700 rpm (When idling)	-
Coolant Temp	Engine coolant temperature/Min.: -40°C (-40°F), Max: 215 °C	80 to 100 °C: After warming up	If -40°C (-40°F): sensor circuit open If 140 °C or more: sensor circuit shorted

Engine and ECT (for 1AR-FE)

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Engine Speed	Vehicle speed/Min.: 0 rpm, Max.: 16383 rpm	600 to 700 rpm (When idling)	-
Coolant Temp	Engine coolant temperature/Min.: -40°C (-40°F), Max: 140 °C	80 to 100 °C: After warming up	If -40°C (-40°F): sensor circuit open If 140 °C or more: sensor circuit shorted

OK:

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

Result	Proceed to
OK	A
NG (for 2GR-FE)	B
NG (for 1AR-FE)	C

A

REPLACE COMBINATION METER ASSEMBLY

B

REPLACE ECM (for 2GR-FE)

C

REPLACE ECM (for 1AR-FE)