Mazda MX-5 NA silhouetteMX-5 NA

CONTROL SYSTEM

F-136prose procedure

WATER THERMOSENSOR

Removal

  1. 1
    Remove the ignition coil assembly. (Refer to page G-21.)
    Photo of water thermosensor area at the cylinder head / thermostat housing with the ignition coil region visible; shows the thermosensor connector being accessed for removal.
    05U0FX-208
  2. 2
    Disconnect the water thermosensor connector.
  3. 3
    Remove the water thermosensor.

Inspection

  1. 1
    Place the sensor in water with a thermometer and heat the water gradually.
    Photo showing the water thermosensor placed in a container of water with a thermometer for the inspection procedure. Label "WATER THERMOSENSOR" with arrow points at the sensor.
    05U0FX-209
  2. 2
    Measure resistance of the sensor with an ohmmeter.
  3. 3
    If not as specified, replace the water thermosensor.

Water thermosensor resistance

-20°C ( -4°F)
Resistance kΩ14.6 — 17.8
20°C ( 68°F)
Resistance kΩ2.2 — 2.7
80°C (176°F)
Resistance kΩ0.29 — 0.35

Installation

  1. 1
    Install the water thermosensor and a new washer.
    Tightening torque: 25—29 N·m (2.5—3.0 m-kg, 18—22 ft-lb)
    Photo of the water thermosensor installed at the cylinder head with the connector being reconnected during installation.
    05U0FX-210
  2. 2
    Connect the water thermosensor connector.
  3. 3
    Install the ignition coil assembly. (Refer to page G-21.)
Tightening torque (water thermosensor)
25-29N·m

THROTTLE SENSOR

Inspection

  1. 1
    Disconnect the connector from the throttle sensor.
    Photo of throttle sensor at throttle body with the SST 49 9200 165 / 49 9200 166 (engine signal checker / connector adapter) connected; the three sensor terminals are labelled POW, TL and IDL on a small diagram at right.
    05U0FX-211
  2. 2
    Connect the (SSTs) or an ohmmeter to the throttle sensor.
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See also

G-21IGNITION SYSTEM — IGNITION COIL

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