Tracker Off-Road 800SX Service Manual page 120

3. Reading is typically 14.7 ohms.
NOTE: If resistance is not present or largely out of
specification, replace the injector.
CRANKSHAFT POSITION (CKP)
SENSOR
Resistance
1. Disconnect the crankshaft position sensor. Set the
meter selector to the OHMS position.
2. Connect the red tester lead to one of the terminals
indicated on the sensor side; then connect the black
tester lead to one of the terminals indicated on the
sensor side.
MOD582
3. The meter reading must be 774-946 ohms at 20° C
(68° F).
AC Voltage
 NOTE: The battery must be at full charge for these
tests.
1. Disconnect the fuel pump; then set the meter selector
to the AC Voltage position.
2. Connect the red tester lead to the brown/green wire;
then connect the black tester lead to the green/white
wire.
3. Crank the engine over using the electric starter.
4. The meter reading must be approximately 3.5 volts
or more.
OXYGEN (O2) SENSOR
Component data can be retrieved using the Dealer Diag-
nostic Service. Utilize the Sensor Data screen.
The Oxygen Sensor (O2 Sensor) is located in the exhaust
pipe.
NOTE: When testing the resistance of the sensor's

heater, the engine/exhaust pipe must be at room tem-
perature (65-75° F or 18-24° C) or inaccurate read-
ings will occur.
1. Tilt the cargo box up.
2. Disconnect the oxygen sensor that is located on the
front side of the engine.
118
MOD583
3. Set the meter selector to the OHMS position.
4. On the sensor side of connector, connect the black
(negative) test lead to one white wire pin; then connect
the red (positive) test lead to the other white wire pin.
The reading is typically 15.9 ohms.
 NOTE: If the meter does not read as specified,
replace the sensor.
TEMPERATURE/MANIFOLD ABSOLUTE
PRESSURE (TMAP) 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 on
top of the intake.
MOD585
2. Select DC Voltage on the tester and turn the ignition
switch to the ON position.
3. Connect the black tester lead to the black/blue wire and
the red tester lead to the pink/violet wire. The meter
should read 4.5-5.5 DC volts. If the meter does not
read as specified, check the ECM connector or wiring.