Engine General Information and Diagnosis: 1A-129
DTC Detecting Condition and Trouble Area
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.
DTC detecting condition Trouble area
• 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)
• Wheel speed sensor and/or its circuit
• ABS/ESP® control module
•ECM
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 Vehicle speed signal check
Is vehicle speed displayed on scan tool in Step 4) and 5) of
“DTC Confirmation Procedure”?
Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”.
Go to Step 3.
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?
Go to applicable DTC
diag. flow.
Substitute a know-good
ECM and recheck.
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