Honda CB900F Service Manual page 382

Avoid touching
the spark plugs
and tester pro bes
to prevent electric
shoc k.
With the ig nit io n coil primary wire connected , connect
the peak voltage adaptor or Imrie teste r to the ignition
coil.
CONNECTION :
No .l/NO.4 coil:
Yellow/ Blue terminal !+l - Bod y ground H
No .2/NO.3 coi l:
Blue/Yellow terminal
(+1 -
Body ground
H
Turn the ignition switch " ON" and engine stop switch
to " RU N " .
Check f or in itial voltage at this time.
The battery voltage should be measured.
If the in itial vo ltage cannot be measured, check the
power supply circuit (refe r to Troubleshooting, page
17-31.
Shift the transmission into neutral.
Crank the eng ine with the starter motor and read igni-
tion coil primary peak voltage.
PEAK VOLTAGE: 100V minimum
If the peak voltage is abnormal, check for an open
circuit or poor connection in Yellow/blue and
Blue /y ellow wires.
If no defects are found in th e harness, refe r to the
troubleshooting chart on page 17-3.
IGNITION PULSE GENERATOR PEAK
VOLTAGE
Check all system connecti ons before inspection. If
the system is disconnected, incorrect peak voltage
might be measured.
Check cylinder compression and check that the
spark plugs are installed correctly.
Disconnect the 22P (Gray ) connector from the ECM
(page 5-761.
IGNITION SYSTEM
00
PEAK VOLTA GE ADAPTOR
ECM
22P (GRAYI CONN ECTOR
17-5