5-13
5
The ECU is rarely the cause for electrical problems; how-
ever, if the ECU is suspected, substitute another ECU to
verify the suspected one is defective.
This EFI system has a built-in feature that will only allow
an ECU of the same part number to be used in this model.
Do not attempt to substitute an ECU from a different
model as the system will not allow it to start.
Error codes can be cleared by following the procedures
located in the ECU Error Codes sub-section in this section.
Regulator/Rectifier
The regulator/rectifier is located under the seat next to
the battery. Try to verify all other charging system com-
ponents before the regulator/rectifier is replaced.
TESTING
1. Start engine and warm up to normal operating tem-
peratures; then connect a multimeter (set at the DC
Voltage position) to the battery as follows.
2. Connect the red tester lead to the positive battery
post and the black tester lead to the negative battery
post.
3. Slowly increase RPM. The voltage should increase
with the engine RPM to a maximum of 15.5 DC
volts.
NOTE: If voltage rises above 15.5 DC volts, the reg-
ulator is faulty or a battery connection is loose or
corroded. Clean and tighten battery connections or
replace the regulator/rectifier. If voltage does not
rise, check Voltage in this section. If charging coil
voltage is normal, replace the regulator/rectifier.
Headlights
The connectors are the four 2-prong ones secured to the
headlight bulbs (two on each side).
VOLTAGE
NOTE: The low beams are the outside bulbs
(black and white wires) and the high beams are the
inside bulbs (yellow and black wires). Always con-
nect the black tester lead to the black wires. The
ignition switch must be in the ON position.
1. Set the meter selector to the DC Voltage position.
2. Set the light switch to the correct position for the
affected light; then connect the black tester lead to
the black wire using a MaxiClip.
3. Connect the red tester lead to the yellow wire (high
beam) or white wire (low beam) using a MaxiClip.
The meter must show battery voltage.
NOTE: If battery voltage is not shown in any test,
inspect the LIGHTS fuse on the power distribution
module, headlight switch, ignition switch, switch
connectors, or wiring harness.
Taillight-Brakelight
VOLTAGE (Taillight)
NOTE: Perform this test at the socket end of the
taillight-brakelight harness (pigtail). The ignition
switch must be in the ON position and either high
beam or low beam selected on the light switch.
1. Set the meter selector to the DC Voltage position.
2. Connect the black tester lead to the black wire; then
connect the red tester lead to the white wire. The
meter should show battery voltage.
3. With the ignition key in the LIGHTS position, the
meter must show battery voltage.
NOTE: If battery voltage is not shown and the
headlights are illuminated, inspect the three-wire
connector in the left-rear canopy tube at the junc-
ture of the canopy tube and lower frame. If battery
voltage is shown on the meter, replace the bulb.
VOLTAGE (Brakelight)
NOTE: Perform this test at the socket end of the
taillight/brakelight harness (pigtail). The ignition
switch must be in the ON position.
1. Set the meter selector to the DC Voltage position.
2. Connect the red tester lead to the red/blue wire; then
connect the black tester lead to the black wire.
3. With the brake applied, the meter must show battery
voltage.
NOTE: If the meter shows no voltage, inspect the
10 amp ignition (IGN) fuse, brakelight switch, wir-
ing harness, or connectors.
Ignition Timing
The ignition timing cannot be adjusted; however, verify-
ing ignition timing can aid in troubleshooting other com-
ponents. To verify ignition timing, use the following
procedure.
NOTE: To check ignition timing, the seat, seat
back, and seat base must be removed.
1. Attach the Timing Light to the spark plug high ten-
sion lead; then remove the timing inspection plug
from the left-side crankcase cover.
Manual
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