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 PCMs) this can sometimes mean something works, but not the way it's supposed to.
Scheme 676
- Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
- Turn the ignition switch to ON (II).
- Make sure the HDS communicates with the powertrain control module (PCM) and other vehicle systems. If it doesn't communicate troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(ref-355276-S19683854952010012200000) ).
- Check the diagnostic trouble code (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, 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.
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.
"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 PCMs) this can sometimes mean something works, but not the way it's supposed to.
Scheme 677
- Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
- Turn the ignition switch to ON (II).
- Make sure the HDS communicates with the powertrain control module (PCM) and other vehicle systems. If it doesn't communicate troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(ref-355276-S19683854952010012200000) ).
- Check the diagnostic trouble code (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, 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. 8 Fl ECU (PCM) (15 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., DTC clear command erases all stored DTC codes, freeze data, onboard 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.
Circuit Diagram
'07 model J35A7 engine
Scheme 678
'08-10 Models J35A7 engine
