SPN 520231 FMI 13 is the Detroit Diesel fault-code service sheet that documents a fuel mass signal that is not available over the CAN network. It is a concise powertrain-CAN communication check for a missing broadcast value. This DiagTechPro library page summarizes what the 1-page PDF contains so a technician can confirm it is the right document before downloading.
Official document details
| Brand | Detroit (Detroit Diesel) |
|---|---|
| Model coverage | DD Series (EPA 2007-Current); Series 60 DDEC VI (EPA 2007) |
| System / group | EPA10 diagnostic trouble codes |
| Suspect Parameter Number | 520231 |
| Failure Mode Identifier | 13 |
| Source | TruckFaultCodes.com, © 2017 |
| Pages | 1 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault description: fuel mass signal over CAN
- Step 1: recent ACM/MCM/CPC reprogramming
- Steps 2-4: power-down and re-check sequence
- Escalation: SPN 625/FMI 9 powertrain-CAN
SPN 520231 FMI 13 diagnostic summary
The document opens by asking whether the ACM, MCM or CPC has been recently reprogrammed, in which case clearing the codes and confirming they stay inactive releases the vehicle. If not, the technician turns the ignition off, disconnects the diesel diagnostic tool, and waits five minutes for all modules to power down, then cycles the ignition on and reconnects. Should the fault codes still be active, the sheet refers the technician to the full SPN 625/FMI 9 procedure for further powertrain-CAN troubleshooting.
Applicable Detroit truck models
This fault-code sheet applies to Detroit DD Series engines certified to EPA 2007 and later emissions standards, and it is cross-listed under the Detroit Series 60 (DDEC VI, EPA 2007) diagnostic set. For full engine specifications and support details, see the official Detroit website.
Who needs this 520231 FMI 13 manual
Detroit diesel technicians tracing a fuelling or torque limitation caused by missing broadcast data use this sheet to eliminate a reprogramming artifact before a deeper CAN diagnosis.
The complete PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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