Suzuki GSF650A Service Manual page 136

1A-61 Engine General Information and Diagnosis:
Step
4 1) Turn the ignition switch OFF.
2) Connect the ECM coupler and IAP sensor coupler.
3) Insert the needle pointed probes to the lead wire coupler.
4) Starter the engine at idle speed and measure the IAP
sensor output voltage at the wire side coupler between
G/B wire and B/Br wire.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
(B): 09900–25009 (Needle pointed probe set)
Tester knob indication
Voltage ( )
IAP sensor #2 output voltage
2.0 – 3.0 V at idle speed
((+) terminal: G/Bl – (–) terminal: B/Br)
Is the voltage OK?
P1750 (Use of SDS)
Step
1 1) Check the IAP sensor is installed securely on the throttle
body.
OK?
Action
(A)
(B)
I718H1110173-03
Action
I717H1110018-01
Yes
• G/B, R or B/Br wire
open or shorted to
the ground, or poor 9,
11 or 29 connection.
• If wire and
connection are OK,
intermittent trouble 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. Refer to "ECM
Removal and
Installation in Section
1C (Page 1C-1)".
Yes
Intermittent trouble.
No
• Open or short circuit
in the G/B wire.
• If wire is OK, replace
the IAP sensor with a
new one. Refer to
"IAP / TP / IAT
Sensor Removal and
Installation in Section
1C (Page 1C-2)".
No
• Retighten the IAP
sensor.
• Replace the IAP
sensor. Refer to
"Throttle Body
Removal and
Installation in Section
1D (Page 1D-10)".