Efi Sensors/Components - Toro 500 EFI Service Manual

RESISTANCE
CAUTION
Always disconnect the battery when performing resis-
tance tests to avoid damaging the multimeter.

NOTE: For these tests, the meter selector should be
set to the OHMS position.
Primary Winding
1. Connect the red tester lead to the terminal (with the
wire removed); then connect the black tester lead to
battery ground.
2. The meter reading must be less than 1 ohm.
Secondary Winding
1. Connect the red tester lead to the high tension lead
(with the plug cap removed); then connect the black
tester lead to either primary terminal.
2. The meter reading must be within specification.

NOTE: If the meter does not show as specified,
replace ignition coil.
Spark Plug Cap
1. Connect the red tester lead to one end of the cap;
then connect the black tester lead to the other end of
the cap.
2. The meter must show 4000-6000 ohms.

NOTE: If the meter does not show as specified,
replace the spark plug cap.
VOLTAGE
Primary Coil
1. Set the meter selector to the DC Voltage position;
then disconnect the two wires from the coil.

NOTE: The coil is located to the right of the engine
and may be accessed from behind the right-side seat
with the cargo box raised.
2. Connect the red tester lead to the orange wire and the
black tester lead to the blue/white wire.
3. Turn the ignition switch to the ON position. The
meter must show battery voltage.

EFI Sensors/Components

CRANKSHAFT POSITION (CKP)
SENSOR
Resistance
1. Set the meter selector to the OHMS position.
2. Connect the red tester lead to the brown wire; then
PR278A
connect the black tester lead to the white wire. The
meter reading must be 104-156 ohms.
AC Voltage

NOTE: The battery must be at full charge for these
tests.
1. Set the meter selector to the AC Voltage position.
2. Connect the red tester lead to the brown wire; then
connect the black tester lead to the white wire.
3. Crank the engine over using the electric starter.
4. The meter reading must be 2.0 volts or more.
OXYGEN (O2) SENSOR
Component data can be retrieved using the CATT II. Uti-
lize 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 inaccurate readings will occur.
1. Open the cargo box; then remove the seat, air filter
cover, and air filter.
2. Remove the backrest and seat base.
AR603D
3. Disconnect the sensor.
129