Tracker Off-Road 500S Service Manual page 108

4. Connect the black test lead to battery ground; then,
on the harness side of the connector, place the red
test lead to the black/green wire. With the meter set
to Ohms, it should show approximately less than one
ohm with the ignition switch in the OFF position.
5. With the meter set to VDC, connect the red test lead
to the light blue/black wire on the harness side of the
connector. With the ignition switch in the ON posi-
tion, the meter will show approximately 3.2 VDC.
6. With the meter still set to VDC and the ignition
switch in the ON position, set the red test lead to the
light green/white wire. The meter will read approxi-
mately 4.5 VDC.
7. Finally, set the red test lead to the orange wire, the
meter will read approximately battery voltage.
NOTE: If any test results from steps 5, 6, 7, or 8 are

incorrect. Troubleshoot the connectors, wiring har-
ness, or battery.
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 EFI Diagnostic System in this section).
1. Disconnect the connector from the sensor located on
top of the throttle body.
2. Select DC Voltage on the tester and turn the ignition
switch to the ON position.
3. Connect the black tester lead to the pink/black wire and
the red tester lead to the orange/blue 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.
4. Connect the sensor to the harness; then using Maxi-
Clips, connect the red tester lead to the brown/white
wire and the black tester lead to the pink/black wire.
With the engine running at idle speed, the meter
should read approximately 2.5 DC volts (MAP sen-
sor signal).
5. Connect the red tester lead to the green/red wire. The
meter should read approximately 2.9 DC volts.
 NOTE: If the meter does not read as specified,
replace the sensor.
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 EFI Diagnostic System in this section).
1. Connect the meter leads (selector in OHMS position)
to the sensor terminals.
2. Suspend the sensor and a thermometer in a container
of cooking oil; then heat the oil.
106
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 as indicated, the sensor must
be replaced.
Oil Temperature
-20° C (-4° F)
40° C (104° F)
100° C (212° F)
4. Install the sensor and tighten securely; then connect
the leads.
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.
1. Set the meter selector to the DC Voltage position.
2. With appropriate needle adapters on the meter leads,
connect the red tester lead to the orange wire; then
connect the black tester lead to the black wire.
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
the red tester lead to the pink/white wire.
6. Slowly move the vehicle forward or backward; the
meter must show near 0 and battery voltage alter-
nately.
To replace a speed sensor, use the following procedure:
1. Disconnect the three-wire connector from the speed
sensor; then remove the cap screw securing the sen-
sor to the sensor housing.
2. Remove the sensor from the sensor housing account-
ing for an O-ring.
3. Install the new speed sensor into the housing with
new O-ring lightly coated with multi-purpose grease;
then secure the sensor with the cap screw (threads
coated with blue Loctite #242). Tighten securely.
CD071
Ohms
28.6k
1.46k-3.51k
0.176k