Tracker Off-Road 800SX Service Manual page 121

ENGINE COOLANT TEMPERATURE
(ECT) SENSOR
Component data can be retrieved using the Dealer Diag-
nostic Service. Utilize the Sensor Data screen.
 NOTE: Preliminary checks may be performed on
this component using the diagnostic mode on the LCD
gauge (see Gauge Diagnostic Menu in this section).
1. Disconnect the connector from the sensor located
below the thermostat housing; then remove the
engine coolant temperature (ECT) sensor.
NOTE: When removing sensor coolant will come

out.
MOD556A
2. Set the meter selector to the OHMS position; then
connect one lead to an outer spade terminal; then
connect the other lead to the other outer spade termi-
nal; then suspend the sensor and a thermometer in a
container of cooking oil; then heat the oil.
NOTE: Neither the sensor nor the thermometer

should be allowed to touch the bottom of the con-
tainer or inaccurate readings will occur. Use wire
holders to suspend the sensor and thermometer.
! WARNING
Wear insulated gloves and safety glasses. Heated oil
can cause severe burns.
3. If the readings are not approximately as indicated,
the sensor must be replaced.
OIL TEMPERATURE
20° C (68° F)
100° C (212° F)
150° C (302° F)
4. Install the sensor and tighten securely; then connect
the leads.
ENGINE OIL PRESSURE SWITCH
The switch is normally closed when the engine is not run-
ning or does not have sufficient oil pressure. The switch
becomes open at approximately 4.35-7.25 psi (30-50 kPa).
1. Disconnect the connector from the engine oil pres-
sure switch located next to the valve cover.
MOD557A
2. Set the meter selector to the OHMS position; then
3. Start the engine. The switch should now be open and
SPEED SENSOR
NOTE: Prior to testing the speed sensor, inspect the

three-wire connector on the speed sensor for contami-
nation, broken pins, and/or corrosion.
MOD488
Testing
OHMS
1. Set the meter selector to the DC Voltage position.
2270-2640
2. With appropriate needle adapters on the meter leads,
183.6
70.2
3. Turn the ignition switch to the ON position.
4. The meter will typically show battery voltage.
5. Leave the black tester lead connected; then connect
6. Slowly move the vehicle forward or backward; the
Replacing
1. Disconnect the three-wire connector from the speed
connect the red tester lead to the pin inside the switch
and the black tester lead to a ground. The switch
should have less than 1 ohm of resistance.
the multimeter should read OL. If the switch does
not open, verify engine oil pressure is greater than
4.35-7.25 psi (30-50 kPa). If engine oil pressure is
greater than 4.35-7.25 psi (30-50 kPa), replace the
engine oil pressure switch.
connect the red tester lead to the orange wire; then
connect the black tester lead to the black wire.
the red tester lead to the pink/white wire.
meter must show 0 and battery voltage alternately.
sensor; then remove the cap screw securing the sen-
sor to the sensor housing.
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