102
EFI Sensors/Components
CRANKSHAFT POSITION (CKP)
SENSOR
To test the CKP sensor, see Stator Coil/Crankshaft Posi-
tion (CKP) Sensor in this section.
MANIFOLD ABSOLUTE PRESSURE
(MAP) SENSOR
1. Disconnect the MAP connector from the pressure
sensor located on top of the throttle body.
2. Select DC Voltage on the tester and turn the igni-
tion switch to the ON position.
3. Connect the black tester lead to the black/green
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 MAP to the harness; then using Maxi-
Clips, connect the red tester lead to the brown/white
wire and the black tester lead to the black/green
wire. With the engine running at idle speed, the
meter should read approximately 1.5 DC volts.
NOTE: If the meter does not read as specified,
replace the sensor.
INLET AIR TEMPERATURE (IAT)
SENSOR
1. Connect the meter leads (selector in OHMS posi-
tion) to the sensor terminals.
2. Suspend the sensor and a thermometer in a con-
tainer 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.
3. On the sensor when the temperature reaches 20° C
(68° F), the meter should read approximately
2.45k ohms.
4. On the sensor when the temperature reaches 50° C
(122° F), the meter should read approximately 800
ohms.
5. On the sensor when the temperature reaches 80° C
(176° F), the meter should read approximately 318
ohms.
6. On the sensor when the temperature reaches 110°
C (230° F), the meter should read approximately
142 ohms.
7. If the readings are not as indicated, the sensor
must be replaced.
Speed Sensor
NOTE: Prior to testing the speed sensor, inspect the
three-wire connector on the speed sensor for con-
tamination, 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 voltage
lead (V); then connect the black tester lead to the
ground lead (G).
CD885A
3. Turn the ignition switch to the ON position.
4. The meter must show 6-12 DC volts.
5. Leave the black tester lead connected; then con-
nect the red tester lead to the signal lead (S) pin.
6. Slowly move the ATV forward or backward; the
meter must show 0 and 6-12 DC volts alternately.
NOTE: If the sensor tests are within specifications,
the LCD gauge must be replaced (see Steer-
ing/Frame/Controls).
To replace a speed sensor, use the following procedure.
1. Disconnect the three-wire connector from the
speed sensor harness or from the speed sensor;
then remove the Allen-head cap screw securing
the sensor to the sensor housing.
2. Remove the sensor from the sensor housing
accounting 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 Allen-head
cap screw (threads coated with blue Loctite #242).
Tighten securely.
! WARNING
Wear insulated gloves and safety glasses. Heated oil can
cause severe burns.
