This exhaust pressure fault DTCs document is a diagnostic troubleshooting procedure for Fault Code 2554, Exhaust Gas Pressure – Data Erratic, Intermittent, or Incorrect. It explains the sensor circuit, fault conditions, guided tests, repair checks, ECM calibration review, and final fault-code clearing steps for Cummins CM2150 applications.
Official exhaust pressure fault DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB, ISC, and ISL; file group lists ISB6.7 CM2150 (2007-09) |
| System/Group | ISB6.7 CM2150 (2007-09) / DTCs; Exhaust Gas Pressure Circuit |
| Publication no. | Not shown in extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 13 |
| 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 for sensor circuit fault codes.
- Guided Step 2 – Check the exhaust gas pressure sensor and circuit.
- Guided Step 3 – Check the ECM and engine harness.
- Guided Step 4 – Check the exhaust gas pressure sensor tube.
- Guided Step 5A – Verify the repair.
- Guided Step 6 – Check ECM calibration and clear fault codes
Applicable truck models
This file applies to Cummins ISB, ISC, and ISL engines using the exhaust gas pressure sensor circuit described in the procedure, with the document group identifying ISB6.7 CM2150 (2007-09) DTC coverage. The component location states that the exhaust gas pressure sensor is above the front section of the exhaust manifold and is plumbed into the exhaust manifold. For official brand information, visit Cummins official website.
Who needs this exhaust pressure fault DTCs manual
This manual is for diesel mechanics, fleet technicians, and workshop owners diagnosing Fault Code 2554 with INSITE™ electronic service tool readings, connector inspections, circuit response tests, and sensor tube checks. It is also useful when verifying whether an ECM calibration update is listed in QuickServe™ Online for this fault code.
The procedure states that Fault Code 2554 is set when the ECM sees the exhaust pressure reading higher or lower than other absolute pressure sensors at key on with the engine not running, or lower than a calibratible value during normal engine operation. The action taken is amber CHECK ENGINE light illumination and use of a default exhaust gas pressure value. Possible causes listed include a stuck in-range exhaust gas pressure sensor reading, high resistance in the exhaust gas pressure sensor signal or return lines, and plugging or restriction in the exhaust gas pressure sensor tube.
The guided checks reference Fault Codes 2373 and 2374, sensor connector pin inspection, ECM connector inspection, jumper-wire circuit response checks, engine harness repair, and exhaust gas pressure sensor replacement when indicated. The repair verification uses INSITE™ Data Monitor/Logger and checks whether Exhaust Gas Pressure is within ±25.4 mm-Hg [±1 in-Hg] of local ambient air pressure. For exhaust pressure fault DTCs troubleshooting, the final step is to operate the engine under the listed clearing conditions, confirm the fault is inactive, and return to earlier steps or contact a Cummins® Authorized Repair Location if the procedure has already been completed and rechecked.
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