This Cummins fault code 123 document is a troubleshooting manual for the Intake Manifold 1 Pressure Sensor Circuit on CM2250 engines. It explains the circuit description, fault conditions, ECM actions, clearing conditions, and guided diagnostic checks for a voltage-below-normal or short-to-low-source fault. The file is a 19-page English PDF listed for Cummins ISB6.7 CM2250 service work.
Official Cummins fault code 123 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, with associated procedure references also listing ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, QSL9 CM2250, QSB6.7 CM2250, GX CM2250, ISF2.8 CM2220, ISF3.8 CM2220, ISB4.5, ISD4.5, ISD6.7, ISL8.9, ISM11, and ISZ13 |
| 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; troubleshooting revision shown as 01-Feb-2011 |
| Pages | 19 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 123
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Associated Procedures
- Guided Step 1 – Check the fault codes.
- Guided Step 2 – Check the intake manifold pressure sensor and circuit.
- Guided Step 3. Check the ECM and engine harness.
- Guided Step 4. Check ECM calibration and clear fault codes.
Applicable truck models
This document applies to Cummins engines and ECM families listed in the file, especially ISB6.7 CM2250 for the DTC group. The extract also names ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, QSL9 CM2250, QSB6.7 CM2250, and other Cummins platforms in the associated procedures table, so technicians should confirm the engine model, ECM code, and service bulletin reference before using the steps. The fault concerns the intake manifold pressure sensor located in the air intake horn, the 5 volt supply, sensor return, and signal circuit monitored by the ECM. For official product and service information, visit Cummins.
Who needs this Cummins fault code 123 manual
Workshop owners, diesel mechanics, and fleet technicians need this Cummins fault code 123 manual when an amber CHECK ENGINE lamp or MIL is linked to SPN 102 FMI 4/4. It is useful when diagnosing low signal voltage, open circuits, shorts to ground, damaged connector pins, ECM connector issues, engine harness faults, or calibration checks with INSITE™ electronic service tool.
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