Cummins ISX11.9 code 122 is the Cummins troubleshooting document for the Intake Manifold 1 Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source fault (PID P102, SPN 102, FMI 3/3). The intake manifold pressure sensor is fed a 5 volt supply and a return by the ECM, and its signal voltage rises with intake manifold pressure so the ECM can monitor boost across the engine load range. It sets an amber warning lamp and lists the exact conditions, causes, and step-by-step checks a technician follows.
Official document details
| Brand | Cummins |
|---|---|
| Model coverage | ISX11.9 CM2250, ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, and ISX15 CM2250 |
| System / Group | ISX11.9 CM2250 (2010-12) / DTCs |
| Fault identifiers | PID P102, SPN 102, FMI 3/3 |
| Warning lamp | Amber |
| Pages | 18 |
| Format | |
| Language | English |
Document table of contents
- Overview and circuit description
- Component location
- Conditions for running the diagnostics
- Conditions for setting the fault code
- Action taken when the fault code is active
- Conditions for clearing the fault code
- Shop Talk and possible causes
- Associated procedures and troubleshooting steps
Trucks covered by Cummins ISX11.9 code 122
This procedure applies to ISX11.9 CM2250, ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, and ISX15 CM2250. This is an official Cummins fault-code troubleshooting procedure, cleared and verified with the Cummins INSITE electronic service tool. It is set by an intake manifold pressure signal voltage above 4.75 VDC for more than 5 seconds, and typical effects include an engine power derate, a substituted default pressure value, and disabled diesel exhaust fluid dosing. For engine specifications and dealer support, see the official Cummins website.
Who needs this Cummins ISX11.9 code 122 manual
Heavy-truck technicians, fleet maintenance teams, and workshop owners diagnosing this fault use it to confirm the code before replacing parts. During diagnosis the sensor is mounted in the air intake horn, and the diagnostic runs continuously with the keyswitch in the ON position. The diagnostic runs continuously with the keyswitch in the ON position, and the repair is validated by returning the code to inactive status.
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