Engine Coolant Temperature Receiver Gauge Malfunction

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

WIRING DIAGRAM





INSPECTION PROCEDURE
HINT: If there is an open or short in the engine coolant temperature sensor circuit, the ECM outputs the DTCs. Troubleshoot SFI System P0115 for 2AZ-FE, P0115 for 2ZR-FE).

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM
(a) Check if a 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 (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





OK:
Gauge indication is normal.
NG -- REPLACE COMBINATION METER
OK -- Continue to next step.

3. 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.

Combination Meter





OK:
Engine coolant temperature value displayed on the Techstream is almost the same as engine coolant temperature receiver gauge indication.
NG -- REPLACE COMBINATION METER
OK -- Continue to next step.

4. 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 2AZ-FE)





Engine and ECT (for 2ZR-FE)





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






C -- REPLACE ECM (for 2ZR-FE)
B -- REPLACE ECM (for 2AZ-FE)
A -- Continue to next step.

5. REPLACE COMBINATION METER
(a) Replace the combination meter with a new or known good one Removal.
OK:
The operation of the combination meter returns to normal.
Result:






C -- REPLACE ECM (for 2ZR-FE)
B -- REPLACE ECM (for 2AZ-FE)
A -- END