This Fault Code 29 troubleshooting page from the Eaton Fuller Advantage Heavy Duty service set guides a technician through the fault isolation procedure for the Remote Throttle Enable Relay circuit. Published as TRTS0980, it mixes harness inspection with voltage and continuity checks at the relay socket.
Official document details
| Brand | Eaton |
| Model coverage | Fuller Advantage Heavy Duty (and Fuller Advantage) automated transmissions |
| System / Group | Fuller Advantage Heavy Duty / DTCs |
| Publication no. | TRTS0980 |
| Year / Revision | 2016.06.20 (© 2016 Eaton) |
| Pages | 3 |
| File size | 0.27 MB |
| Format | |
| Language | English |
Document table of contents
- Step A — Check for Active or Inactive fault codes
- Step B — Product Diagnostic (PD) Mode intermittent check
- Step C — Inspect relay wiring and socket condition
- Step D — Verify power supply to the relay
- Step E — Verify continuity between TECU and relay
- Step V — Verify repair
Applicable truck models
The procedure applies to Eaton Fuller Advantage Heavy Duty transmissions where the Remote Throttle Relay wiring is OEM proprietary, so the manual repeatedly refers the technician to OEM guidelines and schematics. Transmission product data is published on the Eaton Vehicle Group official website.
Fault Code 29 troubleshooting workflow
The technician wiggles the Vehicle Harness between the TECU and Remote Throttle Relay in PD Mode, measures relay socket voltage across Pin 86 and Pin 85 (within 1.5 V of battery voltage) and checks continuity from 38-Way Connector Pin 24 to socket Pin 85 (0–0.3 ohms). Results point to OEM wiring repair, relay replacement or a TECU replacement.
Who needs this Fault Code 29 troubleshooting manual
Heavy-duty technicians use this sheet to test the Remote Throttle Enable circuit with defined pin values, then coordinate OEM-proprietary wiring repairs and verify the fix in ServiceRanger before returning the truck.
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