This Detroit intake pressure low reference documents fault code SPN 102/FMI 18 (Intake Manifold Pressure Too Low) for Detroit DD13, DD15 and DD16 engines. It reproduces the original TruckFaultCodes.com fault tree, from the first check through the final repair, so the code can be confirmed and worked in the exact order the factory intended. Each step lists the measured value or check and the pass or fail branch that follows, matching the layout used in the source document.
Detroit intake pressure low troubleshooting overview
This seven-page GHG14 tree diagnoses under-boost. After comparing inlet-manifold to barometric pressure and checking the charge-air cooler, it branches by turbo type through the wastegate solenoid and the EGR delta-P sensor, valve, cooler and pull rod. It adds turbocharger and axial-power-turbine inspections, DOC and DPF pressure-sensor voltage checks and a test MCM2.1 with a loaded highway verification cycle. Follow the checks in sequence and verify the repair before clearing the code and releasing the vehicle.
Official document details
| Brand | Detroit |
| Model coverage | Detroit DD13, DD15 and DD16 engines |
| System / group | DTCs — intake manifold pressure, wastegate, EGR and aftertreatment |
| Fault code | SPN 102/FMI 18 |
| Source publication | TruckFaultCodes.com (© 2017) |
| Pages | 7 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification — SPN 102/FMI 18
- Enabling-condition table (1130–1810 rpm, torque, throttle, temperatures)
- Inlet-manifold versus barometric pressure comparison
- Air-intake and charge-air-cooler leak or restriction checks
- Wastegate and EGR branch (AT versus TC engines)
- DOC and DPF pressure-sensor voltages and MCM2.1 test
Applicable truck models
It applies to Detroit DD13, DD15 and DD16 engines on the GHG14 platform, including AT and TC turbocharger configurations. Always cross-check the reading against any companion codes before condemning a component. For the official product and service literature, visit the Detroit Diesel website.
Who needs this Detroit intake pressure low manual
Technicians working a low-boost code who need the full charge-air, EGR and aftertreatment branch in order. It is written for shop use as a quick, printable reference to keep beside a diesel diagnostic tool during the job.
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