SPN 729 FMI 7 is the Detroit DD Series diagnostic sheet that explains a problem with the grid heater on EPA07 engines. This fault reports a problem with the intake grid heater. The sheet first has the technician confirm the grid heater positive and negative battery cables are secure at both ends, then disconnect the grid heater harness connector and measure voltage between pins 1 and 4 with the ignition ON. Further steps check pins 1, 2 and 3 against ground and trace any faulty wire back to pins 79, 95, 92 and 41 of the Motor Control Module (MCM). This DiagTechPro library page outlines what the 2 pages PDF contains before you download it.
SPN 729 FMI 7 document details
| Brand | Detroit |
|---|---|
| Model coverage | Detroit DD Series (EPA 2007–Current) |
| System / group | Intake grid heater |
| Fault code (SPN / FMI) | 729 / 7 |
| Fault type | A problem with the grid heater |
| 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 7 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. A note warns that the pin 2 measurement must be taken within 30 seconds of key ON before the voltage drops to about 9 volts, so the sheet suits technicians timing the EPA07 grid heater test correctly.
The complete 2 pages PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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