This Eaton Fault Code 56 guide, part of Eaton Fault Isolation Procedure TRTS0980, gives a technician the ordered steps for diagnosing an Input Shaft Speed Sensor fault on the Fuller Advantage transmission. Branching follows FMI 2, 3, 4 or 5, with resistance checked at 38-Way Pin 7 to Pin 8 and at the 2-Way sensor. Every lettered step lists the pin numbers, resistance windows and voltage ranges to check, and ends with a clear go-to branch so the diagnosis stays repeatable from one workshop to the next.
Official document details
| Field | Detail |
|---|---|
| Brand | Eaton |
| Model coverage | Fuller Advantage Heavy Duty automated transmissions |
| System / Group | DTCs / Fault Isolation Procedures |
| Publication no. | TRTS0980 |
| Year / Revision | 2016 / Rev. 2016.06.20 |
| Pages | 5 |
| File size | 0.7 MB |
| Format | |
| Language | English |
Document table of contents
- Check for Active or Inactive fault codes by FMI
- Product Diagnostic (PD) Mode intermittent-failure check
- Verify continuity of the Input Shaft Speed Sensor circuit
- Verify fault code status after reconnection
- Verify continuity across the sensor and no continuity to ground
- Inspect the transmission main case for internal damage
- Verify repair
Applicable trucks for Eaton Fault Code 56
The chart applies to Fuller Advantage Heavy Duty transmissions where the Input Shaft Speed Sensor reads the input shaft from the upper countershaft drive gear. Resistance windows are 2.0k-4.5k ohms across the sensor with an open circuit to ground. Main-case inspection follows when readings are in range but the code remains Active. For manufacturer specifications and OEM cross-references, visit the Eaton Roadranger website.
Who needs this Eaton Fault Code 56 manual
Technicians facing a transmission that will not engage a start gear use this manual to decide between replacing the sensor, the Transmission Harness, the control unit or main-case gearing. Because the PDF preserves the original component names, connector callouts and measurement ranges, it also helps parts specialists confirm the correct sensor, harness or actuator before a repair order is raised.
The complete PDF is available in the DiagTechPro manuals library; a free account is required to download it, along with the related Fuller Advantage fault-code manuals listed below.
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