DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK CAN COMMUNICATION SYSTEM
CHECK MULTIPLEX COMMUNICATION SYSTEM
PERFORM ACTIVE TEST BY INTELLIGENT TESTER
READ VALUE OF INTELLIGENT TESTER
REPLACE COMBINATION METER ASSEMBLY
METER / GAUGE SYSTEM - Engine Coolant Temperature Receiver Gauge Malfunction
DESCRIPTION
In this circuit, the meter CPU receives engine coolant temperature signals from the ECM using the CAN lines.
The meter CPU displays engine coolant temperature that is calculated based on the data received from the ECM.
WIRING DIAGRAM
INSPECTION PROCEDURE
- If there is an open or short in the engine coolant temperature sensor circuit, the ECM will store the DTCs. Perform troubleshooting of the "SFI System" ((for 4GR-FSE)) "ECD System" ( (for 2AD-FHV)).
| 1.CHECK CAN COMMUNICATION SYSTEM |
Check if CAN communication DTC is output ((for LHD), (for RHD)).
- Result:
| Condition | Proceed to |
| DTC is not output | A |
| DTC is output | B |
| | REPAIR CIRCUITS INDICATED BY OUTPUT DTCS |
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|
| 2.CHECK MULTIPLEX COMMUNICATION SYSTEM |
Check if MULTIPLEX communication DTC is output .
- Result:
| Condition | Proceed to |
| DTC is not output | A |
| DTC is output | B |
| | REPAIR CIRCUITS INDICATED BY OUTPUT DTCS |
|
|
| 3.PERFORM ACTIVE TEST BY INTELLIGENT TESTER |
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Enter the following menus: Diagnosis / Body / Combination Meter / Active Test.
Check the values by referring to the values in the table below.
Combination Meter:| Item | Test Details | Diagnostic Note |
| COOLANT TEMP | LOW, NORMAL, HI | - |
- OK:
- Needle indication is normal.
| | REPLACE COMBINATION METER ASSEMBLY |
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| 4.READ VALUE OF INTELLIGENT TESTER |
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Enter the following menus: Diagnosis / Power Train / Engine / Data List.
Check the values by referring to the values in the table below.
Engine:| Item | Measurement Item/Range (Display) | Normal Condition | Diagnostic Note |
| Water Temperature Meter Operation | Engine coolant temp: -40°C (-40°F) to 140°C (284°F) | After warming up: 80 to 95°C (176 to 203°F) | - |
- OK:
- Engine coolant temperature value displayed on the tester is almost the same as needle indication.
| | GO TO ENGINE CONTROL SYSTEM |
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| 5.REPLACE COMBINATION METER ASSEMBLY |
- OK:
- The operation of the combination meter assembly returns to normal.
LEXUS IS250, IS220d / GSE20 ALE20