Hyundai Accent: Control System Composition
Fault Diagnosis
Features a fail-safe mechanism that prevents dangerous situations from
developing in the event of a transaxle failure. The limp home mode engages if
the transaxle malfunctions. In this mode, the transaxle operates at a minimal
functionality level, making it possible for the vehicle to reach a service center.
Fail-Safe: Prevents dangerous situations from developing in the event
of a malfunction.
Limp Home: Maintains minimal functionality (*) in the event of a malfunction,
making it possible for the vehicle to reach a service center.
(*) Minimal Functionality: Drive (fixed gear setting), Reverse, and Neutral
Self-diagnosis
TCM is in constant communication with the control system's components
(sensors and solenoids). If an abnormal signal is received for longer than the
predefined duration, TCM recognizes a fault, stores the fault code in memory,
and then sends out a fault signal through the self-diagnosis terminal. Such
fault codes are independently backed up and will not be cleared even if the
ignition switch is turned off, the battery is disconnected, or the TCM connector
is disconnected.
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Disconnecting a sensor or an actuator connector while the ignition
switch is in the "On" position generates a diagnostic trouble code (DTC)
and commits the code to memory. In such event, disconnecting the battery
will not clear the fault diagnosis memory. The diagnosis tool must be
used to clear the fault diagnosis memory.
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Before removing or installing any part, read the diagnostic
trouble codes and then disconnect the battery negative (-) terminal.
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Before disconnecting the cable from battery terminal,
turn the ignition switch to OFF. Removal or connection of the
battery cable during engine operation or while the ignition
switch is ON could cause damage to the TCM.
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When checking the generator for the charging state, do
not disconnect the battery '+' terminal to prevent the ECM from
damage due to the voltage.
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When charging the battery with the external charger, disconnect
the vehicle side battery terminals to prevent damage to the
TCM.
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Checking Procedure (Self-diagnosis)
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When battery voltage is excessively low, diagnostic trouble
codes can not be read. Be sure to check the battery for voltage
and the charging system before starting the test
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Diagnosis memory is erased if the battery or the TCM connector
is disconnected. Do not disconnect the battery before the diagnostic
trouble codes (DTC) are completely read and recorded.
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Inspection Procedure (Using the GDS)
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1. |
Turn OFF the ignition switch.
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2. |
Connect the GDS to the data link connector on the lower crash
pad.
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3. |
Turn ON the ignition switch.
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4. |
Use the GDS to check the diagnostic trouble code.
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5. |
Repair the faulty part from the diagnosis chart.
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6. |
Erase the diagnostic trouble code.
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Perform TCM learning after replacing the automatic transaxle
to prevent slow automatic transaxle response, jerky acceleration
and jerky startup.
(Refer to "Automatic transaxle control system (Repair
procedures)" in this group)
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Adding automatic transaxle fluid.
(Refer to "Hydraulic system (Fluid)" in this group)
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After servicing the automatic transaxle or TCM, clear
the diagnostic trouble code (DTC) using the GDS tool. Diagnostic
trouble codes (DTC) cannot be cleared by disconnecting the battery.
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Automatic transaxle system relies on various measurement data to determine
the current control status and extrapolate the necessary compensation values.
These values are used to control the a ...
Adjustment
TCM Learning
When shift shock is occurred or parts related with the transaxle are replaced,
TCM learning should be performed.
In the following case, TCM learnin ...
Description
Repair procedures