17-36 SELF-DIAGNOSIS SYSTEM
Water Temperature Sensor (Service Code 14) (DTC P0115, P0117)
Measure the output voltage with the engine stopped and
with the connector joined.
Turn the ignition switch on.
Standard: About DC 2.80 ∼ 2.97 V @20°C (68°F)
The output voltage changes according to the coolant
temperature in the engine.
Turn the ignition switch off.
If the reading is within the standard, check the ECU for
its ground and power supply (see ECU Power Supply In-
spection in the Fuel System (DFI) chapter).
If the ground and power supply are good, replace the ECU
(see ECU Removal/Installation in the Fuel System (DFI)
If the reading is out of the standard, remove the ECU
and check the wiring for continuity between main and sub
Disconnect the ECU and sensor connectors.
Wiring Continuity Inspection
ECU Connector [A] ←→
Water Temperature Sensor Connector [B]
O lead (ECU terminal 82) [C]
G lead (ECU terminal 38) [D]
If the wiring is good, check the water temperature sensor
resistance (see Water Temperature Sensor Resistance
Water Temperature Sensor Resistance Inspection
Refer to the Water Temperature Sensor Inspection in the
Electrical System chapter.
If the reading is within the standard, but the problem still
exists, replace the ECU (see ECU Removal/Installation in
the Fuel System (DFI) chapter).