Suzuki Liana RH413, Service Manual

Page: 145 / 1302

Engine General Information and Diagnosis: 1A-94
DTC Detecting Condition and Possible Cause
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 with 2
persons, a driver and a tester.
1) Clear DTC and warm up engine to normal operating
temperature.
2) Increase vehicle speed to 80 km/h, 50 mph in 3rd
gear or “2” range while observing vehicle speed
displayed on scan tool.
3) Release accelerator pedal and with engine brake
applied, keep vehicle coasting (fuel cut condition) for
4 sec. or more.
4) Check pending DTC and DTC.
DTC Troubleshooting
DTC detecting condition Possible cause
• Vehicle speed signal is not inputted while vehicle
running in “D” range or during fuel cut at deceleration.
*2 driving cycle detection logic, continuous monitoring
• “BLK/ORN” circuit open
• “PPL” or “BLK/RED” circuit open or short
• VSS malfunction
• ECM malfunction
• Speedometer malfunction
• TCM malfunction
Step Action Yes No
1 Was “Engine and Emission Control System Check”
performed? Go to Step 2. Go to “Engine and
Emission Control
System Check”.
2 Is vehicle equipped A/T? Go to Step 10. Go to Step 3.
3 Does speedometer indicate vehicle speed? Go to Step 4. Go to Step 6.
4 Check vehicle speed signal
Is vehicle speed displayed on scan tool in Step 2) and 3) of
“DTC Confirmation Procedure”?
Intermittent trouble or
faulty ECM.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”. Go to Step 5.
5 Check VSS signal circuit
1) With turn OFF ignition switch, disconnect connector from
VSS.
2) Disconnect combination meter connectors.
3) Turn ON ignition switch, without running engine.
4) Measure voltage from terminal “a” of VSS connector to
ground.
Is voltage within 4 – 5 V?
Faulty speedometer. “PPL” wire open or
short.
Poor connection of ECM
connector terminal.
If OK, substitute a
known-good ECM and
recheck.
I2RH01110120-01