Malfunction in Water Temperature Warning Light

METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM: Malfunction in Water Temperature Warning Light
- Malfunction in Water Temperature Warning Light

DESCRIPTION

In this circuit, the meter ECU (meter circuit plate No.3) receives engine coolant temperature signals from the ECM using the CAN communication system (CAN No. 1 Bus). The meter ECU (meter circuit plate No.3) 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 stores the DTCs. Troubleshoot the SFI System SFI System.
* 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

1. CHECK CAN COMMUNICATION SYSTEM

(a) Check if a CAN communication DTC is output Diagnosis System.

Result:





B -- GO TO CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting
A -- Continue to next step.

2. SYSTEM CHECK

(a) Check the coolant hot warning light.

Result:





B -- CHECK FOR DTC
A -- Continue to next step.

3. PERFORM ACTIVE TEST USING TECHSTREAM (COOLANT HOT INDICATOR)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(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:

Coolant hot warning light operation is normal.

NG -- REPLACE COMBINATION METER ASSEMBLY (NO. 3 METER CIRCUIT PLATE) Disassembly
OK -- Continue to next step.

4. CHECK FOR DTC

(a) Check for the DTC.

Result:





B -- GO TO SFI SYSTEM SFI System

C -- GO TO METER / GAUGE SYSTEM B1503
A -- Continue to next step.

5. READ VALUE USING TECHSTREAM (COOLANT TEMPERATURE, COOLANT TEMP)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus:

(1) for Combination Meter: Body Electrical / Combination Meter / Data List.

(2) for Engine: Powertrain / Engine / Data List.

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

Combination Meter





Engine





OK:

When the Data List values of the ECUs do not match, a signal output error of the ECM is suspected.

NG -- REPLACE ECM Removal
OK -- Continue to next step.

6. REPLACE COMBINATION METER ASSEMBLY (NO. 3 METER CIRCUIT PLATE)

(a) Replace the combination meter assembly (No. 3 meter circuit plate) with a new or a known good one Disassembly.

OK:

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

NG -- REPLACE ECM Removal

OK -- END