Suzuki GW250 Service Manual page 197

4-56 FI SYSTEM DIAGNOSIS
– Between P wire terminal and other terminal at GP switch
coupler: infinity
• Voltage
 09900-25008: Multi circuit tester set
 Tester knob indication: Voltage ()
– Between P wire or B/W 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.
Step 3
GP switch check
1) Turn the ignition switch OFF.
2) Measure the resistance between the P wire and B/W wire,
when shifting the gearshift lever from 1st to Top.
 09900-25008: Multi circuit tester set
 Tester knob indication: Resistance ()
 GP switch resistance:
Approx. 500  or more
(+ terminal: P – - terminal: B/W)
Is check result OK?
Replace the ECM with a known good one, and
YES
inspect it again.
Replace the GP switch with a new one.
NO
(3-22 and 3-76)
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