4 Runner 2WD L4-2.7L (2TR-FE) (2010)
3. SYMPTOM CONFIRMATION AND DIAGNOSTIC TROUBLE CODE
HINT
The diagnostic system in the 4RUNNER has various functions.
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The first function is the Diagnostic Trouble Code (DTC) check. A DTC is a code stored in the ECU memory whenever a
malfunction in the signal circuits to the ECU occurs. In a DTC check, a previous malfunction DTC can be checked by a technician
during troubleshooting.
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Another function is the Input Signal Check, which checks if the signals from various switches are sent to the ECU correctly.
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By using these functions, the problem areas can be narrowed down and troubleshooting is more effective. Diagnostic functions are
incorporated in the following systems in the 4RUNNER.