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Display DTC (Diagnostic Trouble Codes) Information on ALLISON DOC Software

DTC (Diagnostic Trouble Codes)

Figure 1.1. - DTC and General Information

Parameter
  • DTC = The Allison 4th/5th Gen Control system uses a five character, a letter and four numbers, diagnostic trouble codes (for example on Figure 1.1 above - P2808).
  • Active = Y/N (Yes/No), indicates if the Trouble Code is currently active. When a code is logged by the TCM, and the condition causing the code still exists, that code is said to be active, otherwise the trouble code is inactive.
  • Historic = "Y" indicates a diagnostic code has been stored to TCM memory as a valid fault. 
  • Check Trans = "Y" indicates that the DTC is significant enough to turn on the CHECK TRANS light. Not every DTC activates the CHECK TRANS light. 
  • Failure Record = "Y" indicates that a failure record has been generated and stored for the DTC.
  • Description = Describes the DTC.

#Viewing Troubleshooting Manual Information for a Trouble Code
In the DTC and General Information window on Allison DOC, double-click the DTC number or DTC Description to display the DTC Troubleshooting steps. Read More: How to Connecting ALLISON Transmission using ALLISON DOC Software.
Figure 1.2 - Troubleshooting Manual

Clearing the DTC Information
  • In the DTC and General Information window, click the Clear DTC Information button.
  • A window appears displaying the message: Clear Diagnostic Information completed successfully.
  • Click the OK button.
Figure 1.3 - Clear DTC Information
NOTE:
→If the cause of the Trouble Code is not corrected, the Trouble Code will reappear.
→To CLEAR Diagnostic Codes, also can using the Shift Selector Display. Read More: Check Error Code ALLISON Transmission 4700RDS (Road Engine) using Shift Selector Display.


#Performance Complaints
  • Use the Performance Complaints function when no DTCs are present to troubleshoot a Transmission performance symptom.
  • Click on the Performance Complaints button on the DTC and General Information window.
  • Select the appropriate Vehicle Complaint from the drop-down list.
  • Click OK, the Troubleshooting Manual page relevant to the selected Vehicle Complaint displays.
Figure 1.4 - Performance Complaint
Figure 1.5 - Troubleshooting Manual

#Displaying Failure Records
  • Stores operating condition information at the time a problem was detected and the DTC logged.
  • In the DTC and General Information window, double-click on the Y in the Failure Record field.
  • Or click on the Failure Records button.
Figure 1.4 - Failure Records
#DTC Test
→Click on the DTC Test button on the DTC and General Information window.
→The TCM performs a series of "diagnostic tests" to determine if a failure has occurred.
→Displays all application-supported DTCs and indicates the failure status of the Diagnostic Test "Since Clear Code" and "Since Power-Up".
  • Since Clear Code
→Test Failed/Not Performed = Indicates that the Diagnostic Test related to the DTC has failed at least once since the DTCs were cleared, or the Diagnostic Test hasn't been performed by the TCM.
→Test Passed = Sometime after the last clear code event, the TCM ran the Diagnostic Test with no fault found.
  • Since Power-Up
→Test Failed/Not Performed = Indicates that the Diagnostic Test related to the DTC has failed within this ignition cycle, or the Diagnostic Test hasn't been performed by the TCM.
→Test Passed = The TCM ran the Diagnostic Test with no fault found.
Figure 1.5 - DTC Test

#View TCM/Engine Faults
  • This button toggles the DTC and General Information views. When selected, the bottom half of the screen will display any active or inactive engine faults instead of the default grids (TCM Information, Transmission Data, Shift Inhibit, Prognostics Information).
  • This option is only available when connected to 4th/5th Gen TCMs.
Figure 1.6 - View TCM/Engine Faults
  







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