Suzuki Swift Sport 2004 Service & Repair Manual page 179

DTC Detecting Condition and Trouble Area
DTC detecting condition
• Vehicle speed signal is not input while fuel is cut at
deceleration for 4 seconds continuously at 3600 rpm or
less.
• Vehicle speed signal is not input even if engine is running
with more than 3000 rpm at D-Range for 4 sec. (A/T model).
(2 driving cycle detection logic)
DTC Confirmation Procedure
WARNING
!
• When performing a road test, select a place where there is no traffic or possibility of a traffic
accident and be very careful during testing to avoid occurrence of an accident.
• Road test should be carried out by 2 persons, a driver and a tester.
1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Warm up engine to normal operating temperature.
4) M/T model
a) Drive vehicle at 4000 rpm (engine speed) with 3rd gear.
b) Release accelerator pedal and with engine brake applied, keep vehicle coasting for 6 sec. or more (fuel cut
condition for 5 sec. or more) and stop vehicle.
A/T model
a) Drive vehicle at more than 3000 rpm for 10 sec.
5) Check pending DTC and DTC.
DTC Troubleshooting
NOTE
• When measuring circuit voltage, resistance and/or pulse signal at ECM connector, connect the
special tool to ECM and/or the ECM connectors referring to "Inspection of ECM and Its Circuits".
• Upon completion of inspection and repair work, perform "DTC Confirmation Procedure" and
confirm that the trouble has been corrected.
Step
1 Was "Engine and Emission Control System Check"
performed?
2 Vehicle speed signal check
Is vehicle speed displayed on scan tool in Step 4) and 5) of
"DTC Confirmation Procedure"?
3 DTC check in ABS/ESP® control module
1) Check ABS/ESP® control module for DTC.
Is there any DTC of wheel speed sensor or CAN
communication system?
Action
Engine General Information and Diagnosis:
Trouble area
• Wheel speed sensor and/or its circuit
• ABS/ESP® control module
• ECM
Yes
Go to Step 2.
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection in Section
00".
Go to applicable DTC
diag. flow.
1A-129
No
Go to "Engine and
Emission Control
System Check".
Go to Step 3.
Substitute a know-good
ECM and recheck.