The ECM reset command erases all stored DTC codes, freeze data, on-board snapshot, and all specific data to correct the system except Crank (CKP) pattern. This must be done with the HDS after reproducing the DTC during troubleshooting. DTC clear command erases all stored DTC codes, freeze data, and on-board snapshot. They are clear DTCs, ECM reset, and Crank pattern clear. The HDS has three kinds of clear commands to meet this purpose. Stored data based on failed parts should be cleared by using the ‘‘CLEAR COMMAND'' of the HDS, if parts are replaced. The ECM stores various specific data to correct the system even if there is no electrical power such as when the battery negative terminal or No. To do so will only result in confusion and possibly, a needlessly replaced ECM. If the problem is intermittent and you can't duplicate the code, do not continue through the procedure. If you can't duplicate the DTCSome of the troubleshooting requires you to reset the ECM and try to duplicate the DTC. If the MIL did not stay onIf the MIL did not stay on but there is a driveability problem, do the symptom troubleshooting. If no DTCs are found, go to MIL troubleshooting. For specific operations, refer to the user's manual that came with the HDS.The HDS can read the DTC, freeze data, on-board snapshot current data, and other engine control module (ECM) data.Freeze data indicates the engine conditions when the first malfunction, misfire, or fuel trim malfunction was detected.Then refer to the indicated DTC's troubleshooting, and begin the appropriate troubleshooting procedure. Also check the freeze data and/or on-board snapshot data, and download any data found. If the MIL (Malfunction Indicator Lamp) has come onĬheck the diagnostic trouble code (DTC) and note it. How to Use the HDS (Honda Diagnostic System) This is normal: it shows the self-testing condition of the diagnostics for the emissions control systems. It then goes off or brinks 5 times under various conditions. On these models, if you turn the ignition switch to the ON (II) position, without starting the engine, the malfunction indicator lamp will come on for about 20 seconds. With complex electronics (such as ECMs) this can sometimes mean something works, but not the way it's supposed to. In simple electronics, this usually means something won't work at all. A short is an accidental connection of a wire to ground or to another wire. An open is a break in a wire or at a connection. ‘‘Open'' and ‘‘short'' are common electrical terms. If the MIL was on but then went out, the original problem may have been intermittent. If the malfunction indicator lamp (MIL) on the dash does not come on, check for poor connections or loose pins at all connectors related to the circuit that you are troubleshooting. The term ‘‘intermittent failure'' means a system may have had a failure, but it checks OK now. How to Troubleshoot the Fuel and Emissions Systems (R18A) How to Troubleshoot the Fuel and Emissions Systems Intermittent Failures
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