Water Temperature Sensor (Service Code 14)
Refer to the Self-diagnosis Procedures, connect the 12 V
battery to the main harness.
Measure the output voltage with the engine stopped and
the connector joined.
About DC 2.80 ∼ 2.97 V @20°C (68°F)
The output voltage changes according to the coolant
temperature in the engine.
Disconnect the power supply harness.
If the reading is within the standard, check the ECU for
its ground, and power supply (see ECU Power Supply
If the ground and power supply are good, replace the ECU
(see ECU Removal/Installation).
If the reading is out of the standard, remove the ECU and
check the wiring for continuity between the main harness
Disconnect the ECU and sensor connectors.
Wiring Continuity Inspection
ECU Connector [A] ←→
Water Temperature Sensor Connector [B]
W lead [C] (ECU terminal 21)
GY lead [D] (ECU terminal 17)
If the wiring is good, check the water temperature sensor
resistance (see Water Temperature Sensor Resistance
FUEL SYSTEM (DFI) 3-47