Suzuki GW250 Service Manual page 176

Step 1
IAP sensor power supply circuit check
1) Turn the ignition switch OFF.
2) Remove the fuel tank. (5-2)
3) Disconnect the IAP sensor coupler related DTC. (#1 cylinder
1 or #2 cylinder 2)
4) Check for proper terminal connection to the IAP sensor cou-
pler.
5) If connections are OK, turn the ignition switch ON.
6) Measure the voltage between the R wire and B/Br wire.
 09900-25008: Multi circuit tester set
 Tester knob indication: Voltage ()
 IAP sensor power supply voltage:
4.5 – 5.5 V (+ terminal: R – - terminal: B/Br)
Is check result OK?
YES Go to Step 3.
NO Go to Step 2.
Step 2
IAP sensor ground circuit check
1) Measure the voltage between the R wire and ground.
 09900-25008: Multi circuit tester set
 Tester knob indication: Voltage ()
 IAP sensor power supply voltage:
4.5 – 5.5 V (+ terminal: R – - terminal: Ground)
Is check result OK?
YES Repair or replace the B/Br wire.
NO Repair or replace the R wire.
Step 3
IAP sensor signal circuit check
1) Turn the ignition switch OFF.
2) Disconnect the ECM couplers 1.
FI SYSTEM DIAGNOSIS 4-35
1
1
V
2
V
3