Malfunction In Water Temperature Warning Light

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

Malfunction in Water Temperature Warning Light

DESCRIPTION

The ECM sends engine coolant temperature sensor signals to the combination meter assembly via CAN communication. Then the combination meter assembly indicates the engine coolant temperature.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CONFIRM DTC OUTPUT (CAN COMMUNICATION SYSTEM)
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch on and turn the tester on.
(c) Check for DTCs and note any codes that are output Reading and Clearing Diagnostic Trouble Codes.
(d) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(e) Recheck for DTC Reading and Clearing Diagnostic Trouble Codes.
Result:






B -- GO TO DIAGNOSTIC TROUBLE CODE CHART
A -- Continue to next step.
2. CONFIRM DTC OUTPUT (ENGINE CONTROL SYSTEM)
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch on and turn the tester on.
(c) Check for DTCs and note any codes that are output Reading and Clearing Diagnostic Trouble Codes.
(d) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(e) Recheck for DTC Reading and Clearing Diagnostic Trouble Codes.
Result:






B -- GO TO DIAGNOSTIC TROUBLE CODE CHART
A -- Continue to next step.
3. PERFORM ACTIVE TEST USING TECHSTREAM (COOLANT TEMP)
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch on and turn the tester on.
(c) Operate the Techstream according to the display and select "Active Test" Meter / Gauge System.
Body Electrical / Combination Meter / Active Test::






OK:
Value selected during "Active Test" is displayed.
NG -- REPLACE COMBINATION METER ASSEMBLY
OK -- Continue to next step.
4. READ VALUE USING TECHSTREAM (COOLANT TEMP)
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch on and the tester on.
(c) Operate the Techstream according to the display and select "Data List" Meter / Gauge System.
Body Electrical / Combination meter / Data List::






OK:
Vehicle's coolant temperature and tester value are the same.
NG -- REPLACE COMBINATION METER ASSEMBLY
OK -- USE SIMULATION METHOD TO CHECK