This Fault Code 71 troubleshooting guide is the official Eaton fault isolation procedure for an X-Y Shifter engagement problem on the Fuller Advantage Heavy Duty automated transmission. It runs from recording codes and PD Mode through inspection of the shifter, harness and internal gearing.
Official document details
| Brand | Eaton |
| Model coverage | Fuller Advantage Heavy Duty automated transmission |
| System / group | Fuller Advantage Heavy Duty / DTCs — Diagnostic Trouble Codes |
| Publication no. | TRTS0980 |
| Revision | 2016.06.20 |
| Pages | 5 |
| File size | 0.74 MB |
| Format | |
| Language | English |
Fault Code 71 troubleshooting contents
The document is organised as a set of numbered fault isolation steps, each with a stated purpose and a clear go-to branch that sends the technician to the next step, a repair or the final verification. The main sections cover:
- Recording codes and ruling out codes 27, 33, 34, 51, 52, 61, 63 and 64
- Using Product Diagnostic (PD) Mode to locate intermittent failures
- Inspecting batteries, in-line fuse and TECU power and ground
- Inspecting the X-Y Shifter and Transmission Harness for physical damage
- Inspecting X-Y Shifter internal components and the Shift Bar Housing
- Inspecting internal transmission components and verifying the repair
Applicable truck models
This Eaton fault isolation procedure applies to trucks fitted with the Fuller Advantage Heavy Duty automated manual transmission, its Transmission Electronic Control Unit (TECU) and X-Y Shifter. Every step is performed with ServiceRanger, the Eaton diagnostic software, and cross-referenced to the wider TRTS0980 Fault Isolation Procedures manual. Manufacturer background and current service literature are published on Eaton’s official transmission website.
Who needs the Fault Code 71 troubleshooting manual
Fleet technicians facing a repeat engagement fault use this Eaton procedure to inspect the X-Y Shifter, Transmission Harness and Shift Bar Housing methodically before contacting Eaton for further diagnostics.
Because it is drawn straight from Eaton document TRTS0980, the page gives shop staff the same decision trees, connector pin references and pass-or-fail values the manufacturer uses, which shortens diagnosis time and supports accurate warranty documentation.
Related manuals library
The full 5-page PDF, published as Eaton document TRTS0980, is available in the DiagTechPro manuals library; a free account is required to download.
