Invalid Shift Lever Voltage is Eaton Fault Code 14, set when the TECU sees a return voltage from the analog shift control device that does not match the selected position on a Fuller Advantage Heavy Duty transmission. This three-page section of publication TRTS0980 explains the 5-volt reference and resistive-ladder principle, defines the SPN 751 and SPN 752 FMI 2, 4, 5 and 14 conditions, and lists the harness, Cobra lever and driver-behaviour causes. It is the definition companion to the Fault Code 14 troubleshooting steps.
Official document details
| Brand | Eaton |
|---|---|
| Model coverage | Fuller Advantage & Fuller Advantage Heavy Duty automated transmission |
| System / Group | DTCs – Fault Isolation Procedures |
| Publication no. | TRTS0980 |
| Year / Revision | 2016 (Rev. 2016.06.20) |
| Pages | 3 |
| File size | 0.6 MB |
| Format | |
| Language | English |
Invalid Shift Lever Voltage table of contents
- Overview and fault description
- Detection method
- Conditions to set the fault code active
- Fallback and dashboard symptoms
- Conditions to set the fault code inactive
- Possible causes
- Component identification
Applicable truck models covered
This definition covers Eaton Fuller Advantage and Fuller Advantage Heavy Duty automated transmissions using an analog shift control device, including the Eaton Cobra shift lever. The TECU 5-volt reference and the return signal run through OEM wiring, the 8-Way lever connector and the 38-Way Vehicle Harness. Transmission data is published on the manufacturer’s official Eaton transmissions website.
Who needs this Shift Lever Voltage manual
Technicians facing a flashing “F”, a no-crank or a lever stuck in auto mode use this page to understand the resistive-ladder signal and the short, open and erratic causes before testing the harness or lever. Reading which FMI is stored narrows the search quickly, separating a short to ground from an open circuit or a lever held too long by the driver.
The complete PDF, published under Eaton document TRTS0980, is available in the DiagTechPro manuals library; a free account is required to download it.
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