Magazine for the auto service professional
Issue link: http://asp.epubxp.com/i/780462
22 | ASP February 2017 Technical P30-P33" manufacturer specific OBD-II codes that have turned on the MIL. Mode $04... Clear/reset the emissions- related diagnostic information. When you want to clear a stored code or codes, you enter into this mode to do it, but be certain of exactly what you want to do before proceeding. Clearing/resetting the memory will not just turn off the MIL but also erase the freeze frame data and much more. Clearing/resetting will reset the moni- tors status, distance travelled while the MIL was on, number of engine warm-ups, engine run time, oxygen sensor data, on-board monitor- ing test results and pending codes. I try to record as much of this infor- mation as possible for future reference after the repair (I use screen capture or take a picture with my phone). Performing a clear/reset may erase some learned engine values and adaptive memories that may cause some driveability issues unless properly road-tested. Certain vehicles will not allow a clear/reset if the proper conditions aren't met (Chryslers and Hondas both need the key on but engine off). Mode $05...Request the oxygen sensor monitoring test results. is mode was intended to allow access to the PCM's oxygen sensor monitoring values and test results. Different manufactures used many different and unique methods to calculate the O2 effectiveness and operation (one mode may convert that data to the same standard units of measurement). is mode is only used if the vehicle is not using CAN (controller area network) electri- cal architecture. If it is a CAN vehicle this data is now stored in Mode $06. Mode $06...Request the on-board moni- toring test results for specific monitored systems. Mode $06 provides access to the OBD-II test results of the specific components and systems that it has tested. It will show the results of both continuously monitored (misfire monitoring for example) and non-continuously monitored systems (EGR or evaporative systems for example) in this data. This Mahle scanner provides quick access to the OBD-II system and will even provide a printout to give to the customer before and after a repair. This is the opening screen of the Mahle OBD-II diagnostic panel showing the 10 different modes that can be accessed.