28" (P1655) Stv Actuator Circuit Malfunction - Suzuki TU250X Service Manual

"28" (P1655) STV ACTUATOR CIRCUIT MALFUNCTION

DETECTED CONDITION
The operation voltage does not reach the STVA.
ECM does not receive communication signal from
the STVA.
STVA
B
P
G
W/Bl

When using the multi circuit tester, do not strongly touch the terminal of the ECM coupler with
a needle-point probe to prevent the terminal damage or terminal bend.
INSPECTION
NOTE:
After repairing the trouble, clear the DTC using SDS tool.
(4-24)
Step 1
1) Lift up the fuel tank by removing the fuel tank mounting bolt.
(5-3)
2) Check the STVA lead wire coupler for loose or poor contacts.
3) Move the air cleaner box by removing the mounting bolts.
4) Turn the ignition switch ON to check the STV operation.
(STV operating order: Fully open → Close)
Is the operation OK?
YES Go to Step 2.
• Loose or poor contacts on the STVA coupler
• Open or short circuit in the G, W/R, W/B or B/R
NO
wires
• If wire and connection are OK, go to Step 2.
POSSIBLE CAUSE
• STVA malfunction
• STVA circuit open or short
• STVA motor malfunction
G
W/R
B/R
W/B
1
1
FI SYSTEM DIAGNOSIS 4-53
ECM
STVA. 1B
STVA. 1A
STVA. 2B
STVA. 2A