Suzuki GW250 Service Manual page 209

4-68 FI SYSTEM DIAGNOSIS
Step 3
FP relay drive circuit check
1) Turn the ignition switch OFF.
2) Disconnect the ECM couplers 1.
3) Check for proper terminal connection to the ECM couplers.
4) If connections are OK, check the following points.
• Resistance
 09900-25008: Multi circuit tester set
09900-25009: Needle-point probe set
 Tester knob indication: Resistance ()
– Between O/Bl wire and Y wire of FP relay coupler and ECM
coupler: less than 1 
– Between O/Bl or Y wire and ground: infinity
• Voltage
 09900-25008: Multi circuit tester set
 Tester knob indication: Voltage ()
– Between O/Bl wire or Y wire and ground: approx. 0 V
(When ignition switch is ON)
Is check result OK?
Replace the ECM with a known good one, and
YES
inspect it again.
NO Repair or replace the defective wire harness.
3
3
3
3