BL TCU

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A/T Technical Training for SORENTO
Subject OBD-II Fault handling
KIA MOTORS
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4. TCU Block diagram Terminal assignment
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5. Fault handling
5-1. DTC List
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?1 Only for 4WD vehicles, - not be
supported Fault type A DTC stored on the
1st driving cycle B DTC
stored on the 2nd driving cycle continuously
C Only Fail-safe (not DTC
stored) MIL ? -- supported(to be
performed at the same time as DTC stored)
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5-5. DTC detection, decision condition Fail
safe
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METHOD OF SOLENOID MALFUNCTION DETECTION
?Detection of Gear position ?Ex) Detection of
S1 STUCK ON failure TCU detects 2nd gear ratio
in case that TCU shifts to 3rd gear.
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1 The prohibition time is started when shift
changes. 2 It is necssary to get the failure
detection in both gear position , due to failure
decision. where, Vehicle speed(rpm) output
shaft speed
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1 The prohibition time is started when shift
changes or L/Up is full engaged. 2 It is
necssary to get the failure detection in both
gear position , due to failure decision.
where, Ne Engine speed Ni
Turbine speed L/U Lock up
Vehicle speed(rpm) Output shaft speed
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Emergency mode fixed at 4th gear, Lock up off
and Line pressure is max
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6. TCU Circuit diagram