Suzuki DL650 Service Manual page 200

4-40 Fl SYSTEM DIAGNOSIS
Step 3
1) Turn the ignition switch OFF.
2) Connect the STP sensor coupler.
3) Insert the needle pointed probes to the STP sensor coupler.
4) Disconnect the STVA coupler.
5) Turn the ignition switch ON.
6) Measure the STP sensor output voltage at the coupler
(between
@
Yellow and
@
BIBr wires) when the secondary
throttle valve is full closed and opened.
NOTE:
The secondary throttle valve can be turned by rotating the actu-
ator shaft end
0.
STP sensor output voltage
Secondary throttle valve is closed: Approx. 0.58 V
Secondary throttle valve is opened: Approx. 4.40 V
e 0 9 9 0 0 - 2 5 0 0 8 : Multi circuit tester set
09900-25009: Needle pointed probe set
i m
Tester knob indication: Voltage (=)
Do not use the tool for turning the STVA shaft to pre-
vent breakdown.
Is the voltage OK?
YES
Red, Yellow or BIBr wire open or shorted to
ground, or poor
@, @
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 STP
sensor with a new one.