This Cummins fault 122 document is a troubleshooting manual for the intake manifold 1 pressure sensor circuit on CM2250 engines. It explains the circuit description, fault logic, effects, clearing conditions, and guided diagnostic steps for a voltage above normal or shorted-to-high-source condition.
Official Cummins fault 122 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, with associated CM2250 and other listed Cummins engine models |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Intake Manifold 1 Pressure Sensor Circuit |
| Publication no. | 4022254 for ISB6.7 CM2250 in the associated procedures table |
| Year/Revision | Last modified 11-Jun-2010 and 30-Dec-2010; file year unknown |
| Pages | 18 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 122 – Intake Manifold 1 Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Associated Procedures
- Troubleshooting Steps
- Guided Step 2B – Check the circuit response
- Guided Step 3A-1 – Check the ECM response
- Step 3B-1 – Check the sensor supply voltage and return circuit
- Guided Step 4B – Disable the fault code
Applicable truck models
The file is listed for Cummins ISB6.7 CM2250 DTC service information and also references ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, QSL9 CM2250, and QSB6.7 CM2250 in the associated procedures. The tables also list related ECM, calibration, engine wiring harness, and intake manifold pressure/temperature sensor procedures for several Cummins families, including ISF2.8 CM2220, ISF3.8 CM2220, ISB4.5, ISD4.5, ISD6.7 CM2150 SN, ISL8.9 CM2150 SN, ISM11 CM876 SN, and ISZ13 or ISX13 CM2150 as shown in the extract. For current manufacturer support, see Cummins official website.
Who needs this Cummins fault 122 manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this Cummins fault 122 manual when an amber CHECK ENGINE light, MIL, derate, disabled DEF injection, disabled regeneration, or EGR closure is linked to SPN 102 FMI 3/3. The procedure is useful before replacing parts because it directs checks for multiple faults, sensor supply faults, inactive faults, connector damage, harness shorts, ECM connector issues, calibration level, and INSITE™ clearing validation.
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