This is the Eaton AutoShift troubleshooting guide for the Gen III Automated Transmissions, published as TRTS0930 EN-US. It contains fault-code retrieval, the Fault Code Isolation Procedure Index, electrical pretests and symptom-driven diagnostics for UltraShift and AutoShift.
Official document details
| Brand | Eaton |
| Model coverage | UltraShift & AutoShift Gen III automated transmissions |
| System / Group | UltraShift & AutoShift (Gen 3) |
| Publication no. | TRTS0930 EN-US |
| Year / Revision | January 2016 |
| Pages | 381 |
| File size | 31.9 MB |
| Format | |
| Language | English |
Inside the Eaton AutoShift troubleshooting guide
- Diagnostic procedures and fault code retrieval/clearing
- Electrical pretest and power-up sequence test
- Fault Isolation Procedures (Codes 11 through 99)
- Fault Code 41 Range Failed to Engage
- Fault Code 71 Unable to Disengage Gear
- Symptom Isolation Procedures and shift complaint tests
The guide front-loads the diagnostic workflow: manual and ServiceRanger fault-code retrieval and clearing, the Fault Code Isolation Procedure Index, a Symptom-Driven Diagnostics Index and Product Diagnostic (PD) Mode. A block of pretests follows, covering the TECU power harness, preferred 12- and 24-volt connections, the ignition circuit, J1939 data link and a power-up sequence test. The bulk of the book is fault isolation for codes from 11 through 99, including range and splitter engagement, solenoid valves, rail and gear position sensors, speed sensors, and the rail and gear select motors. Symptom isolation procedures close the book with up/down button, start-enable relay, data-link and shift-complaint tests, each backed by specific voltage, pressure and resistance ranges measured with a multimeter and air gauges.
Applicable truck models
The guide applies to Gen III RTO, RTLO, FO and FOM models such as RTO-16910B-AS3 and RTLO-22918A-AS3. Test values include battery, ignition and speed-sensor resistance ranges (for example 2K–4.5K ohm at the input shaft speed sensor). Verify coverage against your VIN and build sheet on the Eaton Roadranger site.
Who needs the Eaton AutoShift troubleshooting guide
Diagnostic technicians use this guide to isolate active fault codes with ServiceRanger, run the electrical pretest and follow step-by-step fault isolation for range, clutch, sensor and data-link faults before any component is replaced.
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