Suzuki DL650 Service Manual page 186

4-26 FI SYSTEM DI A GNOSI S
Step 2
1) Connect the IAP sensor coupler.
2) Insert the needle pointed probes to the lead wire coupler.
3) Start the engine at idle speed.
4) Measure the IAP sensor output voltage at the wire side cou-
pler (between G/B and B/Br wires).
IAP sensor output voltage: Approx. 2.7 V at idle speed
(@ GIB
-
@
BIBr)
09900-25008: Multi circuit tester set
09900-25009: Needle pointed probe set
j )
Tester knob indication: Voltage (=)
throttle body vacuum for crack or damage.
1
No
I
Open or short circuit in the G/B wire.
YES
-
I
I
Replace the IAP sensor with a new one.
Go to Step 3
Check the vacuum hose and the passage of
Step 3
1) Remove the IAP sensor. (-4-49)
2) Connect the vacuum pump gauge to the vacuum port of the
IAP sensor.
Arrange 3 new 1.5 V batteries in series
@
(check that total
voltage is 4.5
-
5.0 V) and connect
@
terminal to the ground
terminal and
@
terminal to the Vcc terminal.
Check the voltage between Vout
@
and ground. Also, check
if voltage reduces when vacuum is applied up to 400 mmHg
by using vacuum pump gauge. (-4-27)
0991 7-4701 1 : Vacuum pump gauge
09900-25008: Multi circuit tester set
iB
Tester knob indication: Voltage (=)
Is the voltage OK?
YES
Red, G/B or B/Br wire open or shorted to
ground, or poor
0 ,
@
or
@
connection.
If wire and connection are OK, intermittent trou-
ble or faulty ECM.
Recheck each terminal and wire harness for
open circuit and poor connection.
If check result is not satisfactory, replace IAP sen-
sor with a new one.