Suzuki GW250 Service Manual page 204

• Voltage
 09900-25008: Multi circuit tester set
 Tester knob indication: Voltage ()
– Between W/R, B/R, W/B or Lbl wires and ground: approx. 0
V (When ignition switch is ON)
Is check result OK?
YES Go to Step 2.
NO Repair or replace the defective wire harness.
Step 2
ISC valve check
1) Remove the ISC valve. (5-18)
2) Check the continuity between each ISC valve terminal and
ground.
 09900-25008: Multi circuit tester set
 Tester knob indication: Resistance ()
 ISC valve continuity:  (Infinity)
3) If OK, measure the resistance (between the W/R wire termi-
nal A and B/R wire terminal B) and (between the W/B wire
terminal C and Lbl wire terminal D).
 ISC valve resistance:
Approx. 20  at 20 °C (68 °F)
(Terminal: A – Terminal: B)
(Terminal: C – Terminal: D)
Is check result OK?
Replace the ECM with a known good one, and
YES
inspect it again.
NO Replace the ISC valve with a new one.
(Terminal – Ground)
FI SYSTEM DIAGNOSIS 4-63
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