Suzuki AN400 Service Manual page 114

1A-51 Engine General Information and Diagnosis:
Step
2 1) Turn the ignition switch to OFF.
2) Disconnect the STVA lead wire coupler.
3) Connect the STP sensor coupler to the test harness.
4) Turn the ignition switch to ON.
5) Measure the STP sensor output voltage at the wire
terminal (between positive terminal "A" and negative
terminal "B" by turning the secondary throttle valve
(close and open) with a finger.
STP sensor output voltage
Secondary Throttle valve is closed: Approx. 0.5 V
Secondary Throttle valve is opened: Approx. 3.9 V
Special tool
: 09900–28630 (TPS test wire harness)
Tester knob indication
Voltage ( )
STP
Is the voltage OK?
Action
(A)
(A)
A ( )
Y/G
R
ECM
B/Br
( )
B
Yes
• R, Y/G or B/Br wire
open or shorted to
ground, or poor (14),
(29) or (4)
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
harness for open
circuit and poor
connection.
• Replace the ECM
with a known good
one, and inspect it
again.
I705H1110073-02
I705H1110074-02
I705H1110071-01
No
If check result is not
satisfactory, replace
STP sensor with a new
one.