electronic control module, selecting them may open a sub-menu with viewing
options.
During the diagnosis process, if the Diagnostic Tool displays ''System is OK'' or ''No
Trouble Code,'' it indicates that either there are no related fault codes stored in the
ECU or that faults are not monitored by that specific ECU. Many faults may be
related to mechanical system issues or circuit operation problems. It's also possible
that a sensor signal may be inaccurate but within acceptable limits, which can be
further examined using Live Data (PID).
4.10.2 Clear Codes
This function erases DTC records, including both current and historical data, as well
as other stored information from the vehicle's electronic control module (ECM).
When the erase command is sent through the diagnostic program, the vehicle's
electronic control module (ECM) will verify whether the issue has been resolved over
multiple drive cycles. Some faults are immediately detected by the ECU when the
ignition key is in the ''run'' position, even without the engine running. However,
other faults may require very specific test conditions to be met, such as engine
coolant temperature within a specific range, vehicle speed maintained for a certain
duration, throttle position within a defined range, etc.
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