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Active Control Engine Mount (Acm) System (V6): Other Honda Accord VIII

Engine Control Systems 1 illustration ~371 words

Intermittent Failures

The term intermittent failure means a system may have had a failure, but it checks OK now. Check for poor connections or loose terminals at all connectors related to the circuit that you are troubleshooting.

Opens And Shorts

Open and short are common electrical terms. An open is a break in a wire or at a connection. A short is an accidental connection of a wire to ground or to another wire. In simple electronics, this usually means something won't work at all. With complex electronics (such as PCMs) this can sometimes mean something works, but not the way it's supposed to.

Scheme 56

Scheme 56: How To Use The HDS
Scheme 56: How To Use The HDS
  1. Connect the HDS to the DLC (A) located under the driver's side of the dashboard.
  2. Turn the ignition switch to ON (II).
  3. Make sure the HDS communicates with the vehicle and the PCM. If it does not communicate, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(ref-423675-S13110687632011092800000) ).
  4. Check the DTC and note it. Also check the freeze data and/or on-board snapshot data, and download any data found. Then refer to the indicated «DTC'S TROUBLESHOOTING»(ref-423708-S16687259482011092800000) , and begin the appropriate troubleshooting procedure. NOTE: Freeze data indicates the engine conditions when the first malfunction, was detected. The HDS can read the DTC, freeze data, on-board snapshot, and current data about the active control engine mount (ACM) system. For specific operations, refer to the user's manual that came with the HDS.

HDS Clear Command

The PCM stores DTCs about the ACM system even if there is no electrical power such as when the battery negative terminal or No. 19 BACK UP FI ECU (7.5 A) fuse are disconnected. Stored data based on failed parts should be cleared by using the CLEAR COMMAND of the HDS, if parts are replaced.

The HDS has two kinds of clear commands to meet this purpose. They are DTC clear, and ACM reset. The DTC clear command erases all stored DTC codes, freeze data, on-board snapshot and readiness codes. This must be done with the HDS after reproducing the DTC during troubleshooting.

The PCM reset command erases all stored DTC codes, freeze data, on-board snapshot, readiness codes, and all specific data about the ACM system.

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