Suzuki VZ800 Service Manual page 189

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
 09900-25008: Multi-circuit tester set
 Tester knob indication: Voltage ()
.
Is the voltage OK?
• 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-
YES 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.
• Inspect that metal particles or foreign material
stuck on the CKP sensor and rotor tip.
NO • If there are no metal particles and foreign mate-
rial, then replace the CKP sensor with a new
one.
3) After repairing the trouble, clear the DTC using SDS tool.
(5-25)
(+ Green – - Blue)
1 Peak volt adaptor
2
Bl
2
ECM coupler (Harness side)
G