Throttle Position Sensor System Inspection; Ignition System Inspection - Honda 2003 NPS50 Ruckus Service Manual

IGNITION SYSTEM
Read the
instructions for Connect the timing light to the spark plug wire.
timing fi g ht
Start the engine, let it idle and check the ignition
operation. timing.
IDLE SPEED: 2,000
The ignition timing is correct if the "F" mark on the
flywheel aligns with the index mark at idle.
Install the removed parts in the reverse order of
removal.
THROTTLE POSITION SENSOR
SYSTEM INSPECTION
Remove the inner cover {page 3�5).
Disconnect the ECM 26P connector.
Measure the resistance between the Yellow/red and
Blue/green wire terminals.
STANDARD: 4 - 6 kQ (20'C/6B'F)
Measure the resistance between the Yellow/red and
Blue/green wire terminals at the wire harness side
connector with the throttle operation.
Full open - Full closed position:
Resistance decrease
Full closed - Full open position:
Resistance increase
If the resistance measured at ECM is abnormal,
measure the resistance at the throttle position sen­
sor.
Remove the floor step (page 3-7).
Disconnect the throttle position sensor 3P connec­
tor.
Check the 3P connector for loose contact or cor­
roded terminals.
Measure the resistance between the Yellow/red and
Blue/green wire terminals of the sensor side con­
nector.
STANDARD: 4 - 6 kQ (20'C/68'F)
Measure the resistance between the Yellow/red and
Yellow/blue wire terminals of the sensor side con­
nector by turning the throttle.
Full open - Full closed position:
Resistance decrease
Full closed - Full open position:
Resistance increase
If the measurements are abnormal, replace the
throttle position sensor.
If the measurement at the ECM 26P is abnormal and
the one at the throttle position sensor 3P connector
is normal, check for an open or short circuit, or the
loose or poor connections in the wire harness.
Install the removed parts in the reverse order of
removal.
1 7-8
±
100 rpm