Honda NSS250S Manual page 549

If the peak voltage measured at the ECM connector
is normal, measure the peak voltage at the CKP sen-
sor connector.
Turn the ignition switch OFF.
Disconnect the CKP sensor 2P (Red) connector.
Connect the peak voltage adapter to the CKP sensor
2P connector terminals of the sensor side.
CONNECTION: Yellow (+) – White/yellow (–)
In the same manner as at the ECM connector, mea-
sure the peak voltage and compare it to the voltage
measured at the ECM connector.
• If the peak voltage measured at the CKP sensor is
normal and the one measured at the ECM is
abnormal, the wire harness has an open or short
circuit, or loose connection.
• If both peak voltages measure are abnormal,
check each item in the troubleshooting chart
(page 20-4). If all items are normal, the CKP sen-
sor is faulty. See following steps for CKP sensor
replacement (page 13-7).
Install the removed parts in the reverse order of
removal.
USING THE TEST HARNESS
• Check all system connections before performing
this inspection. If the system is disconnected,
incorrect peak voltage might be measured.
• Check that the cylinder compression is normal
and the spark plug is installed correctly.
Place the scooter on its center stand.
Connect the test harness to the ECM 33P (Black)
connector (page 6-17).
Connect the peak voltage adaptor to the terminals
of the test harness.
TOOLS:
ECM test harness
Imrie diagnostic tester (model 625) or
Peak voltage adaptor
with commercially available digital multimeter
(impedance 10 MΩ/DCV minimum)
CONNECTION: 12 (Yellow) (+) – 23 (White/yellow) (–)
Turn the engine stop switch " " and ignition switch
Retract the
ON.
sidestand.
Crank the engine with the starter switch and mea-
Avoid touching the
sure the CKP sensor peak voltage.
tester probes to
prevent electric
PEAK VOLTAGE: 0.7 V minimum
shock.
maxiscooter-club.ru
070MZ-MCA0100
07HGJ-0020100
IGNITION SYSTEM
2P CONNECTOR
TEST HARNESS PIN BOX
(12) (23)
20-7