DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK CAN COMMUNICATION SYSTEM
PERFORM ACTIVE TEST USING INTELLIGENT TESTER (COOLANT TEMP)
READ VALUE USING INTELLIGENT TESTER (COOLANT TEMPERATURE)
READ VALUE USING INTELLIGENT TESTER (ENGINE COOLANT)
REPLACE COMBINATION METER ASSEMBLY
CHECK COMBINATION METER ASSEMBLY
METER / GAUGE SYSTEM - Engine Coolant Temperature Gauge Malfunction
DESCRIPTION
In this circuit, the combination meter assembly receives engine coolant temperature signals from the ECM using CAN communication lines. The combination meter assembly displays an 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, an SFI system DTC is output. If output, perform troubleshooting on the SFI system first.
| 1.CHECK CAN COMMUNICATION SYSTEM |
Check for DTCs ().
Result| Result | Proceed to |
| CAN communication system DTC is not output | A |
| CAN communication system (for LHD) DTC is output | B |
| CAN communication system (for RHD) DTC is output | C |
| | Go to CAN COMMUNICATION SYSTEM ()
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| | Go to CAN COMMUNICATION SYSTEM ()
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| 2.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (COOLANT TEMP) |
Operate the intelligent tester according to the display and select Active Test.
Combination Meter| Tester Display | Test Part | Control Range | Diagnostic Note |
| Water Temperature Meter Operation | Engine coolant temperature receiver gauge | LOW, NORMAL or HIGH | Perform the test with the vehicle stopped and engine idling. |
- Confirm that the vehicle is stopped and the engine is idling.
- OK:
- Needle indication is normal.
Result| Result | Proceed to |
| OK | A |
| NG (w/ Multi-information Display) | B |
| NG (w/o Multi-information Display) | C |
| | REPLACE COMBINATION METER ASSEMBLY ()
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| | REPLACE COMBINATION METER ASSEMBLY ()
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| 3.READ VALUE USING INTELLIGENT TESTER (COOLANT TEMPERATURE) |
Operate the intelligent tester according to the display and select Data List.
Combination Meter| Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
| Coolant Temperature | Engine coolant temperature/Min.: -40 (-40), Max.: 140 (284) | After warming up: 80 to 105 (176 to 221) | Unit: °C (°F)
If the value is -40 (-40): The sensor circuit is open
If the value is 140 (284): The sensor circuit is shorted.
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- OK:
- Coolant temperature displayed on the intelligent tester is between 80°C (176°F) and 95°C (203°F) after warming up.
ResultResult
Result | Proceed to |
| OK | A |
| NG (w/ Multi-information Display) | B |
| NG (w/o Multi-information Display) | C |
| | REPLACE COMBINATION METER ASSEMBLY ()
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| | REPLACE COMBINATION METER ASSEMBLY ()
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| 4.READ VALUE USING INTELLIGENT TESTER (ENGINE COOLANT) |
Operate the intelligent tester according to the display and select Data List.
Engine*1, *2, *3| Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
| Coolant Temp | Engine coolant temperature:
Min.: -40°C, Max.:140°C | 80 to 100°C (176 to 212°F):
After warming up | If the value is -40°C (-40°F), the sensor circuit is open.
If the value is 140°C (284°F), the sensor circuit is shorted.
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Engine*4| Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
| Coolant Temp | Engine coolant temperature/
Min.: -40°C, Max.:140°C | After warming up engine: 75 to 90°C (167 to 194°F) | If the value is -40°C (-40°F) or 140°C (284°F), the sensor circuit is open or shorted.
After a long soak, the coolant temperature, intake air temperature, and ambient air temperature are approximately equal.
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*1: for 1GR-FE
*2: for 1UR-FE
*3: for 3UR-FE
*4: for 1VD-FTV
- OK:
- Engine coolant temperature value displayed on the intelligent tester is almost the same as actual engine coolant temperature.
Result| Result | Proceed to |
| OK | A |
| NG (for 1GR-FE) | B |
| NG (for 1UR-FE) | C |
| NG (for 3UR-FE) | D |
| NG (for 1VD-FTV) | E |
| 5.REPLACE COMBINATION METER ASSEMBLY |
w/ Multi-information Display:
Temporarily replace the combination meter with a new one ().
w/o Multi-information Display:
Temporarily replace the combination meter with a new one ().
| 6.CHECK COMBINATION METER ASSEMBLY |
w/ Multi-information Display:
Check that the operation of the combination meter returns to normal ().
w/o Multi-information Display:
Check that the operation of the combination meter returns to normal ().
- OK:
- Operation of combination meter returns to normal.
Result| Result | Proceed to |
| OK | A |
| NG (for 1GR-FE) | B |
| NG (for 1UR-FE) | C |
| NG (for 3UR-FE) | D |
| NG (for 1VD-FTV) | E |
| A | |
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| END (COMBINATION METER IS DEFECTIVE) |
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