Steps for Fault Code Analysis:



 A: Readout and record all fault codes

 B: Clear all fault codes

 C: Confirm that fault code has been cleared

 D: simulate the conditions that fault arise and perform road test

 E: reread and record the fault code at this time

 F: distinguish between sporadic fault code (soft fault codes or irrelevant fault codes or historical fault codes)    and continuous fault code (the current fault code or related fault code, or hard fault code)

 G: distinguish between the main fault and minor fault code that are relevant to fault symptoms

 H: distinguish between various fault codes or the main fault codes among related fault codes (which may lead to the cause of other trouble codes)

 I: based on the above analysis, further detects accurately the sensor , the actuator elements or control computer and relevant circuit state represented by fault codes so as to ascertain the exact location of trouble spots.

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