Detroit fault code SPN 2798 FMI 4 is the TruckFaultCodes.com diagnostic sheet for the Injector Needle Control Valve Cylinder 4, 5, 6 Shorted to Ground condition on Detroit DD-series engines. This 4 pages reference lists the fault identification, monitored conditions where shown, and the step-by-step troubleshooting the technician follows in the shop.
Official document details
| Brand | Detroit |
|---|---|
| Model coverage | Detroit DD Series (EPA 2007-Current) |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Publication no. | Not printed; TruckFaultCodes.com reference |
| Year / Revision | 2017 |
| Pages | 4 |
| File size | 0.4 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification (SPN 2798 / FMI 4)
- Description and engine reaction
- Rear injector harness inspection
- Isolating injectors 4, 5 and 6
- MCM 120-pin connector check
SPN 2798 FMI 4 troubleshooting steps
The sheet monitors Injector Needle Control Valve Cylinder 4, 5, 6. Enabling conditions are engine speed at idle or higher. Typical duration is 2 seconds, the dash lamps are MIL and CEL, and the engine reaction is 25 percent derate.
The four-page routine disconnects the rear fuel injector harness 14-pin connector and inspects it for bent or spread pins and water or oil intrusion. Resistance between pin 1 on the rocker cover side and battery ground is measured, then injectors 4, 5 and 6 are disconnected one at a time to isolate the shorted injector, which is replaced. If no injector is at fault the under valve cover harness is replaced, and the MCM 120-pin connector is checked, with a short to ground between pin 19 and the harness repaired as required.
Applicable truck models
This sheet applies to Detroit DD-series diesel engines (the DD13, DD15 and DD16 family) built under the EPA 2007-Current emissions platform, in its EPA10 / GHG14 calibration. Engine and emissions specifications should always be confirmed against the vehicle build; full engine information is published on the Detroit Diesel official site.
Who needs this SPN 2798 FMI 4 manual
Technicians with a 25 percent derate and a rear-bank injector control valve short to ground use this sheet to isolate the failed cylinder from a harness or MCM fault. It is a quick bench reference rather than a full workshop manual, so the named removal steps still route back to Power Service Literature and, where escalation is needed, to the Detroit Customer Support Center.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download it.
Related manuals library
Sản phẩm liên quan cho hãng này
Cùng brand theo taxonomy hiện có trong catalog WooCommerce.
Detroit Diesel Reports 6.3
Detroit Reprogramming Station (DDRS) 7.11
DDDL Backdoor Password: A Comprehensive Guide
