Suzuki VL800 Service Manual page 401

"C13" (P1750) or "C17" (P0105) IAP SENSOR CIRCUIT MALFUNCTION
DETECTED CONDITION
C13/C17 IAP sensor voltage is not within the fol-
lowing range.
0.1 V Sensor voltage < 4.8 V
NOTE:
Note that atmospheric pressure varies
depending on weather conditions as
well as altitude.
Take that into consideration when
inspecting voltage.
IAP sensor #2 (Front cylinder)
IAP sensor #1 (Rear cylinder)
INSPECTION
Step 1
1) Remove the fuel tank. ($14-93)
2) Turn the ignition switch OFF.
3) Check the IAP sensor couplers (Front cylinder side 1 or rear
cylinder side 2) for loose or poor contacts.
If OK, then measure the IAP sensor input voltage.
4) Disconnect the IAP sensor couplers.
5) Turn the ignition switch ON.
6) Measure the voltage at the Red wire 3 and ground.
7) Also, measure the voltage at the Red wire 3 and B/Br wire
4.
! IAP sensor input voltage: 4.5 – 5.5 V
" 09900-25008: Multi-circuit tester set
& Tester knob indication: Voltage (')
Is the voltage OK?
YES Go to Step 2.
• Loose or poor contacts on the ECM coupler.
NO • Open or short circuit in the Red wire or B/Br
wire.
• Clogged vacuum passage between throttle body
and IAP sensor.
• Air being drawn from vacuum passage between
throttle body and IAP sensor.
• IAP sensor circuit open or shorted to ground.
• IAP sensor malfunction.
• ECM malfunction.
R
G/W
B/Br
(+ Red – - Ground)
(+ Red – - B/Br)
VL800K5 ('05-MODEL)
POSSIBLE CAUSE
VCC
R
G B IAP (F)
B/Br E2
IAP (R)
1
1
V
14-49
ECM