Start Enable Relay faults set Eaton Fault Code 17 on the Fuller Advantage Heavy Duty transmission, whose neutral-crank logic prevents the engine cranking unless the transmission confirms neutral. This five-page section of publication TRTS0980 defines the J1939 SPN 1321 FMI 3, 4 and 14 conditions, explains the latch coil, voltage and ground supply, and lists the wiring and bypass causes. It also shows the four normally open circuit states used when diagnosing a no-crank complaint.
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 | 5 |
| File size | 0.7 MB |
| Format | |
| Language | English |
Start Enable Relay 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
- Relay circuit states (normally open)
Applicable truck models covered
This definition covers Eaton Fuller Advantage and Fuller Advantage Heavy Duty automated transmissions on chassis that use a physical relay rather than J1939 crank enable messaging. The relay circuit is supplied and wired by the OEM through the 5-Way socket and 38-Way Vehicle Harness, so OEM schematics are required. Transmission data is published on the manufacturer’s official Eaton transmissions website.
Who needs this Start Enable Relay manual
Truck electricians diagnosing a no-crank complaint use this Enable Relay reference to confirm neutral logic, coil latching and OEM wiring before condemning the relay or the TECU. The four circuit-state diagrams show exactly when the relay should be open or closed for key-on and key-start, which makes it easier to judge a live reading against the intended behaviour.
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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