This SPN 3598 FMI 3 document is a Detroit DD Series fault-code procedure for the proportional valve bank 2 circuit failed high condition across all model years. It sets out the voltage checks made at the Motor Control Module.
Official document details
| Brand | Detroit |
| Model coverage | Detroit DD Series (EPA 2007-Current) |
| System / group | DD Series / DTCs |
| SPN | 3598 |
| FMI | 3 |
| Condition | proportional valve bank 2 circuit failed high |
| Emissions level | all model years |
| Source | Detroit Power Service Literature |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
SPN 3598 FMI 3 troubleshooting steps
With the MCM 120-pin connector disconnected and the ignition on, you measure voltage at pin 62 and then pin 64 against ground. Voltage above 11.5 volts at pin 62 points to a short to power from the rear engine brake solenoid, while voltage at pin 64 points to a short from the electronic dosing valve. If no voltage is present at either pin, the Motor Control Module is replaced.
- Fault description: proportional valve bank 2 circuit failed high
- Monitored parameter and verification data
- Steps 1 to 3 – Disconnect MCM, ignition on, pin 62 voltage
- Step 4 – Voltage at MCM pin 64
- Replace the Motor Control Module if no voltage
Applicable truck models
This fault code applies to Detroit DD Series diesel engines of all model years that use a Motor Control Module and rear engine brake and dosing valve circuits. The removal step references Detroit Power Service Literature; confirm the pinout on the official Detroit Diesel website.
Who needs this SPN 3598 FMI 3 manual
Diesel technicians and workshop owners who find bank 2 pulled high on a Detroit engine use this sheet to check for a short to power from the brake or dosing valve circuits before condemning the Motor Control Module.
The full PDF is available in the DiagTechPro manuals library, where a free account is required to download.
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