Service Manual — page 153 of 715

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FUEL SYSTEM (DFI) 3-63
Water Temperature Sensor (Service Code 14) (DTC P0115, P0117)
(Checking wire for short circuit to power supply wire)
• Connect the ECU connectors.
• Connect the measuring adapter [A] between the harness
  connector and water temperature sensor as shown.
   Sub Harness [B]
   Water Temperature Sensor [C]
    Special Tool - Measuring Adapter: 57001-1700
• Connect
  leads.
          a digital meter [D] to the measuring adapter

    Water Temperature Sensor Output Voltage
     Connections to Adapter:
        Digital Meter (+) → R (sensor W/BL) lead
        Digital Meter (–) → BK (sensor W/R) lead

• Measure   the output voltage with the engine stopped and
  with the connector joined.
• Turn the ignition switch on.
    Output Voltage
     Standard:       About DC 2.80 ∼ 2.97 V @20°C (68°F)

                             NOTE
    ○The output voltage changes according to the coolant
      temperature in the engine.

• Turn  the ignition switch off.
  If the reading is out of the standard, repair or replace the
    main harness or subharness.
    If the main harness is no problem, replace the water tem-
    perature sensor.
Water Temperature Sensor Inspection (Service
Code 14/DTC P0117)
(Checking wire for short circuit to ground)
• Disconnect:
   ECU Connectors (see ECU Removal)
   Water Temperature Sensor Connector (see Water Tem-
   perature Sensor Removal/Installation)
• Check the wiring for short circuit to ground by checking
  continuity between the sensor connector [A] and frame
  ground [B].
    Wiring Continuity Inspection
     W/BL lead (ECU terminal 30, W/G lead) [C] ←→ Frame
     Ground
    If there is continuity, repair or replace the main harness
    or subharness.
    If there is no continuity, check the water temperature sen-
    sor resistance (see Water Temperature Sensor Inspection
    in the Electrical System chapter).
(Checking sensor for internal short circuit)
  If the water temperature senor resistance is out of the
  standard, replace the water temperature sensor.