This SPN 3598 FMI 4 document is a Detroit DD Series fault-code procedure for the proportional valve bank 2 circuit failed low condition across all model years. It covers the resistance-to-ground checks that isolate a short in the bank 2 supply.
Official document details
| Brand | Detroit |
| Model coverage | Detroit DD Series (EPA 2007-Current) |
| System / group | DD Series / DTCs |
| SPN | 3598 |
| FMI | 4 |
| Condition | proportional valve bank 2 circuit failed low |
| Emissions level | all model years |
| Source | Detroit Power Service Literature |
| Pages | 3 |
| File size | 0.3 MB |
| Format | |
| Language | English |
SPN 3598 FMI 4 troubleshooting steps
The routine removes the rear valve cover fuel injector harness, then measures resistance to ground at the harness, the Exhaust Gas Recirculation valve actuator, the fuel cutoff valve, and the electronic dosing valve. A short below five ohms at each point directs you to repair the specific harness segment, replace the EGR valve on DD13, DD15 or DD16 engines, or replace the hydrocarbon doser block assembly per Power Service Literature.
- Fault description: proportional valve bank 2 circuit failed low
- Steps 1 to 3 – Rear valve cover harness resistance to ground
- Steps 4 to 5 – EGR valve actuator resistance check
- Steps 6 to 9 – MCM connector and fuel cutoff valve checks
- Steps 10 to 11 – Electronic dosing valve and doser block
Applicable truck models
This fault code applies to Detroit DD Series diesel engines — the DD13, DD15 and DD16 — of all model years, using a Motor Control Module. EGR valve and doser block removal reference Detroit Power Service Literature; verify the procedure for your engine on the official Detroit Diesel website.
Who needs this SPN 3598 FMI 4 manual
Diesel technicians and workshop owners tracing a bank 2 short on a Detroit engine use this document to walk each connector in turn and confirm whether the harness, the EGR valve, or the doser block is at fault before ordering parts.
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