Honda NSS250S Manual page 550

IGNITION SYSTEM
If the peak voltage measured at the test harness is
normal, measure the peak voltage at the CKP sensor
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 test harness, measure
the peak voltage and compare it to the voltage mea-
sured 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.
CKP SENSOR PEAK VOLTAGE
(NSS250A)
USING THE TEST PROBE
• 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.
Disconnect the PCM 33P (Black) connector (page 6-
102).
Connect the peak voltage adaptor or tester probes
to the terminals of the PCM 33P (Black) connector.
TOOLS:
Test probe
Imrie diagnostic tester (model 625) or
Peak voltage adaptor
with commercially available digital multimeter
(impedance 10 MΩ/DCV minimum)
CONNECTION: Yellow (+) – 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.
20-8
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07ZAJ-RDJA110
07HGJ-0020100
2P CONNECTOR
PCM 33P CONNECTOR
(Wire side/female terminals)
Yellow White/yellow