SPN 654: injector cylinder 4
Fault in the injector or its wiring on cylinder 4. Type another SPN and FMI to check it.
Fault in the injector or its wiring on cylinder 4.
- Check the injector harness plug at the valve cover.
- Run a cylinder cutout test.
- Measure the injector coil resistance.
Paste the whole line if you like: "SPN 3251 FMI 0", "3251/0" or Deere's "003251.00". Plain-words guidance; the service manual wins.
What SPN 654 means
Fault in the injector or its wiring on cylinder 4.
How urgent it is
Fix it today. Fix it this shift or today. Left alone it tends to become a derate.
What to check first
- Check the injector harness plug at the valve cover.
- Run a cylinder cutout test.
- Measure the injector coil resistance.
Plain-words guidance for a foreman, not a repair procedure. Makers add their own codes and steps; the machine's service manual wins.
Other FMIs for SPN 654
| Code | What failed | Urgency |
|---|---|---|
| SPN 654 FMI 5 | current low or open circuit | Fix it today |
| SPN 654 FMI 6 | current high or grounded | Fix it today |
Next time, Dozer catches the code when it fires.
Plug a CAN logger into the machine's J1939 port, or connect the telematics you have. When a code fires, Dozer opens a repair ticket with the meaning, how urgent it is and what to check.
- The code, the machine and its hours on one ticket
- Severity sorted: keep working, plan a stop, or stop now
- The mechanic gets the checklist before they drive out
- Repeat codes on the same machine get flagged
LIVE EX-04 · SPN 3251 FMI 0 · plan a stop today Photo is an AI-generated stand-in, not a customer site.
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Questions crews ask
What does SPN 654 mean?
Fault in the injector or its wiring on cylinder 4.
Can I keep running with SPN 654?
Fix it today. Finish what's safe to finish, then fix it this shift. Ignoring it usually turns into a derate or a bigger repair. If the machine derates or the stop lamp is on, stop.
What should I check first for SPN 654?
Check the injector harness plug at the valve cover. Run a cylinder cutout test. Measure the injector coil resistance.
How do I clear SPN 654?
Fix the cause first. Most codes go inactive by themselves once the condition is gone and the engine has run a key cycle or two. Clearing it with a service tool without a fix only hides it until it comes back.
Which machines show SPN 654?
Any diesel that speaks SAE J1939: excavators, dozers, loaders, haul trucks, generators and on-road trucks with Cat, Cummins, Deere, Komatsu, Volvo, Kubota, Perkins and other engines. The SPN means the same thing on all of them; the fix steps can differ, so check the service manual.
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