Engine Coolant Temperature Receiver Gauge Malfunction

METER: METER / GAUGE SYSTEM: Engine Coolant Temperature Receiver Gauge Malfunction

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 lines (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





INSPECTION PROCEDURE
HINT: If there is an open or short in the engine coolant temperature sensor circuit, the ECM outputs the DTCs. Perform troubleshooting with the "SFI System" Engine Control System - SFI System for 2GR-FE, Engine Control System - SFI System for 1AR-FE).

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM
(a) Check if CAN communication DTC is output Diagnosis System.
Result:






B -- GO TO CAN COMMUNICATION SYSTEM
A -- Continue to next step.
2. PERFORM ACTIVE TEST USING TECHSTREAM
(a) Connect Techstream to the DLC3.
(b) Ignition switch on (IG).
(c) Turn the tester on.
(d) Enter the following menus: Body Electrical / Combination Meter / Active Test.
(e) Check the operation by referring to the values in the table below.

Combination Meter:





OK:
Needle indication is normal.
NG -- REPLACE COMBINATION METER ASSEMBLY
OK -- Continue to next step.
3. READ VALUE USING TECHSTREAM
(a) Connect Techstream to the DLC3.
(b) Ignition switch on (IG).
(c) Turn the tester on.
(d) Enter the following menus: Body Electrical / Combination Meter / Data List.

Combination Meter:





OK:
Engine coolant temperature value displayed on the tester is almost the same as needle indication.
NG -- REPLACE COMBINATION METER ASSEMBLY
OK -- Continue to next step.
4. READ VALUE USING TECHSTREAM
(a) Connect Techstream to the DLC3.
(b) Ignition switch on (IG).
(c) Turn the tester on.
(d) Enter the following menus: Powertrain / Engine and ECT / Data List.
(e) Check the values by referring to the values in the table below.

Engine and ECT:





OK:
Engine coolant temperature value displayed on the tester is almost the same as actual engine coolant temperature.
Result:






C -- REPLACE ECM (for 1AR-FE)
B -- REPLACE ECM (for 2GR-FE)
OK -- Continue to next step.
5. REPLACE COMBINATION METER ASSEMBLY
(a) Replace the combination meter assembly with a new or a normal one Removal.
OK:
The operation of the combination meter assembly returns to normal.
Result:






C -- REPLACE ECM (for 1AR-FE)
B -- REPLACE ECM (for 2GR-FE)
OK -- END