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General Transmission Fault Unknown (SPN 2003 - FMI 31)

WARNING - General Transmission Fault Unknown

Figure 1.1 - SPN 2003 FMI 31 (Murphy PowerView)

Today, we'll trying to find out the troubleshooting of warning message: General Transmission Fault Unknown on Murphy PowerView PV101 display (refer to Figure 1.1 above).

We have Pump Truck with CAT Engine C-13 and Allison 4700OFS Transmission. When this warning message appears, the Transmission can't engaged.

Here the STEPS:
1). Open CAT ET to check if any Active Codes on C-13 Engine. Read More: How to Connecting Caterpillar ET Software to the ECM, but there's no Active Codes (both Diagnostic and Event Codes).
Figure 1.2 - No Active Diagnostic Codes

#Murphy PowerView PV100/ PV101 (Implementation of SAE J1939 Parameters)
#Support Allison DTC's as below:
  • Retarded Temperature Above Normal (SPN 120 - FMI 15)
  • Transmission Oil Temperature Above Normal (SPN 177 - FMI 15)
  • Unknown General Transmission Fault (SPN 2003 - FMI 31)

2). Open Allison DOC and connect to diagnostic port on Allison Transmission. Read More: How to Connecting ALLISON Transmission using ALLISON DOC Software.
Figure 1.3 - DTC and General Information
→No Active DTC's.
In this case, there are 4 logged codes: P2723, P2714, P0722, and P0731.
Figure 1.4 - Clear DTC Information
→To CLEAR diagnostic codes, also can using the Shift Selector Display. Read More: Check Error Code ALLISON Transmission 4700RDS using Shift Selector Display.

3). After Clear DTC Information, then restart the power supply to TCM.
→The warning message General Transmission Fault Unknown should gone now..




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