Suzuki AN400 Service Manual page 92

1A-29 Engine General Information and Diagnosis:
Step
3 1) Remove the IAP sensor.
2) Connect the vacuum pump gauge to the vacuum port "A"
of the IAP sensor.
3) Arrange 3 new 1.5 V batteries in series (check that total
voltage is 4.5 – 5.0 V) and connect negative terminal to
ground terminal and positive terminal to Vcc terminal.
4) Check the voltage between Vout and ground.
5) Also, check if voltage reduces when vacuum is applied
by the vacuum pump gauge.
Special tool
(A): 09917–47010 (Vacuum pump gauge)
(B): 09900–25008 (Multi-circuit tester set)
Tester knob indication
Voltage ( )
Negative pressure
kPa
Approx. 120.0 Approx. 1.20
Approx. 66.7 Approx. 0.67
Approx. 13.3 Approx. 0.13
Is the voltage OK?
Action
"A"
Ground
Vout
Vcc
V
Output voltage
2
kgf/cm psi
Approx. 17.06 Approx. 4.2
Approx. 9.48 Approx. 2.6
Approx. 1.89 Approx. 1.0
Yes
• R, G/B or B/Br wire
open or shorted to
ground, or poor (4),
(6) or (14)
connection. Refer to
"Terminal Alignment
of ECM Coupler
(Harness Side)
(Page1A-5)".
• If wire and
connection are OK,
intermittent trouble or
faulty ECM.
• Recheck each
terminal and wire
I705H1110117-01
harness for open
circuit and poor
connection.
• Replace the ECM
with a known good
one, and inspect
again.
(A)
(B)
I705H1110140-01
V
I705H1110137-04
No
If check result is not
satisfactory, replace IAP
sensor with a new one.