Suzuki AN400 Service Manual page 152

4-24 FI SYSTEM
Step2
1) Disconnect the CKP sensor coupler.
2) Crank the engine a few seconds with the starter motor, and
measure the CKP sensor peak voltage at the coupler.
$ CKP sensor peak voltage: 4.5 V and more
3) Repeat the above test procedure a few times and measure
the highest peak voltage.
If OK, then measure the CKP sensor peak voltage at the
ECM terminals. ( 1 – 2)
! 09900-25008: Multi circuit tester set
& Tester knob indication: voltage (')
Is the voltage OK?
• BIue or Green wire open or shorted to ground,
or poor 1 or 2 connection.
• If wire and connection are OK, intermittent trou-
YES
ble or faulty ECM.
• Recheck each terminal and wire harness for
open circuit and poor connection.
• Loose or poor contacts on the CKP sensor cou-
NO pler or ECM coupler.
• Replace the CKP sensor with a new one.
( - Blue – + Green)
ECM coupler