This Cummins 2374 troubleshooting manual is a diagnostic document for Fault Code 2374 on Cummins CM2250 engines. It covers the exhaust gas pressure sensor circuit, low signal voltage logic, INSITE™ checks, harness inspection, ECM connector tests, and repair validation. The file is Code 2374.pdf, supplied as a 17-page English PDF for workshop use.
Official Cummins 2374 troubleshooting manual document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, plus associated CM2250 engine models listed in the procedure table |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Exhaust Gas Pressure Sensor Circuit |
| Publication no. | 4022254 for ISB6.7 CM2250; other bulletin numbers are listed for related engine models |
| Year/Revision | Last Modified: 11-Jun-2010; troubleshooting section Last Modified: 28-Dec-2010 |
| Pages | 17 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- 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 1 – Check the fault codes.
- Guided Step 2 – Check the exhaust gas pressure sensor and circuit.
- Guided Step 3B – Inspect the ECM and engine harness connector pins.
- ECM Calibration
Applicable truck models
This document applies to Cummins engines and ECM families named in the extract, including ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250, GX CM2250, and ISL8.9 CM2150 SN where listed in the associated procedures. The diagnostic is for Fault Code 2374, PID P131, SPN 1209, FMI 4/4, described as Exhaust Gas Pressure Sensor Circuit – Voltage Below Normal or Shorted to Low Source. The sensor is located above the front section of the exhaust manifold and is plumbed into the exhaust manifold. Official manufacturer information is available from Cummins.
Who needs this Cummins 2374 troubleshooting manual
Diesel mechanics, fleet technicians, and workshop owners need this procedure when an amber CHECK ENGINE lamp or MIL is linked to low exhaust gas pressure sensor signal voltage. It helps confirm whether the cause is a sensor supply fault, inactive code history, connector damage, engine wiring harness issue, ECM connector issue, calibration concern, or ECM replacement authorization path.
The procedure explains that the ECM provides a 5 volt supply and sensor return, while the signal voltage changes with exhaust manifold pressure. The fault sets when the ECM detects exhaust gas pressure signal voltage below 0.25-VDC for more than 8 seconds. When active, the ECM uses a default exhaust gas pressure value, disables diesel exhaust fluid injection into the aftertreatment system, disables active and stationary regeneration of the diesel particulate filter, closes the EGR valve, and can reduce engine torque after extended operation. The troubleshooting flow uses INSITE™ electronic service tool, key switch ON/OFF conditions, jumper checks between SUPPLY and SIGNAL pins, 4.75 to 5.25-VDC measurements, connector inspection, and final clearing validation after idle operation.
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