Suzuki Boulevard M50, Service Manual

Page: 189 / 454

5-32 FI SYSTEM
Step 2
1) Crank the engine a few seconds with the starter motor, and
measure the CKP sensor peak voltage at the coupler.
2) Repeat the above test procedure a few times and measure
the highest peak voltage.

CKP sensor peak voltage: 4.0 V and more
(
+
Green –
-
Blue)
1
Peak volt adaptor

09900-25008: Multi-circuit tester set

Tester knob indication: Voltage (

)
.
Is the voltage OK?
3) After repairing the trouble, clear the DTC using SDS tool.
(

5-25)
YES
• G/Y or Brown wire open or shorted to ground
• Loose or poor contacts on the CKP sensor cou-
pler or ECM coupler (terminal
9
or
Q
)
• If wire and connection are OK, intermittent trou-
ble or faulty ECM.
• Recheck each terminal and wire harness for
open circuit and poor connection.
• Replace the ECM with a known good one, and
inspect it again.
NO
• Inspect that metal particles or foreign material
stuck on the CKP sensor and rotor tip.
• If there are no metal particles and foreign mate-
rial, then replace the CKP sensor with a new
one.
2
Bl
G
ECM coupler (Harness side)
2
SA
MP
LE