3-54 FUEL SYSTEM (DFI)
Water Temperature Sensor (Service Cod e 14)
Water Temperature Sensor Output Voltage
Inspection
NOTE
○
Be sure the battery is fully charged.
○
The output voltage changes according to the coolant
temperature in the engine.
•
Remove the ECU (see ECU Removal).
○
Do not disconnect the connectors.
•
Connect a digital meter [A] to the ECU connector [B] with
the needle adapter set.
Special Tool - Needle Adapter Set: 57001-1457
Wa ter Temperature Sensor Output Voltage
Connections to ECU Connector
Meter (+) → O lead (terminal 14)
Meter (–) → BR/BK lead (terminal 10)
•
Measure the output voltage with the engine stopped and
the connector joined.
•
Turn the ignition switch ON.
Output Voltage at ECU
Standard: About 2.24 ∼ 2.48 V at 25°C (77°F)
•
Turn the ignition switch OFF.
If the output voltage is within the standard, check the ECU
for its ground, and power supply (see ECU Power Supply
Inspection).
If the ground and power supply are good, replace the ECU
(see ECU Removal/Installation).
If the output voltage is out of the standard, check the
wiring.
If the wiring is good, check the water temperature sensor
resistance (see Water Temperature Sensor Resistance
Inspection in the Electrical System chapter).
Water Temperature Senso r Re sistance Inspection
•
Refer to the Water Temperature Sensor Inspection in the
Electrical System chapter.
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