SPN 729 FMI 0 is the Detroit DD Series diagnostic sheet that explains grid heater permanently on on EPA07 engines. This fault reports that the intake grid heater is permanently on. The sheet has the technician disconnect the grid heater harness connector and the Motor Control Module (MCM) 120-pin connector, then measure the resistance between pin 1 of the grid heater harness and ground. A reading below 5 ohms indicates a short to ground back to pin 79 of the MCM, otherwise the grid heater is replaced. This DiagTechPro library page outlines what the 2 pages PDF contains before you download it.
SPN 729 FMI 0 document details
| Brand | Detroit |
|---|---|
| Model coverage | Detroit DD Series (EPA 2007–Current) |
| System / group | Intake grid heater |
| Fault code (SPN / FMI) | 729 / 0 |
| Fault type | Grid heater permanently on |
| Emissions platform | EPA07 |
| Source | TruckFaultCodes.com (Copyright © 2017) |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification (SPN and FMI reference)
- Fault description and affected circuit
- Step-by-step troubleshooting procedure
- Grid heater harness voltage and resistance checks
- Grid heater repair or replacement instructions
Applicable truck models and engines
This fault sheet applies to Detroit DD Series engines built to the EPA07 emissions platform. It is used with the Detroit diesel diagnostic tool, and with ServiceLink where module configuration must be confirmed. Detroit publishes these fault codes through TruckFaultCodes.com, and the same SPN can appear on more than one module, so confirm the reading before ordering parts. For engine coverage and official service literature, see the Detroit official support site.
Who needs the SPN 729 FMI 0 sheet
Fleet technicians and Detroit-certified workshops troubleshooting this Intake grid heater fault need this sheet to follow the correct checks instead of guessing at parts. Replacement points to “Removal of the EPA07 Grid Heater” in Power Service Literature, so the sheet fits shops working EPA07 intake-heater circuits.
The complete 2 pages PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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