Cummins ISM code 556 is the DiagTechPro reference page for this Cummins diagnostic fault code 556 document, a 2-page PDF sourced from TruckFaultCodes.com (Copyright 2017) covering the lamp: red crankcase pressure – data valid but above normal operational range – most severe level isx – condition. The pressure inside the crankcase is measured by the crankcase pressure sensor. When the crankcase pressure sensor determines that the crankcase pressure is higher than normal, this fault code is logged. When the condition is detected the ECM logs the fault and illuminates the red warning lamp.
Cummins ISM code 556 document details
| Brand | Cummins |
|---|---|
| Model coverage | Crankcase Pressure Sensor Circuit ISM – Crankcase Pressure Sensor Circuit (ISM CM871, 2007-09) |
| System / Group | ISM CM871 (2007-09) / DTCs |
| Fault identifier | Code 556 (PID P101, SPN 101, FMI 0/0) |
| Warning lamp | Red |
| Source | TruckFaultCodes.com |
| Year / Revision | Copyright 2017 |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Circuit Description
- Component Location
- Shop Talk
- Troubleshooting Steps
- Repair verification and clearing fault codes
Applicable truck models
This document applies to Cummins Crankcase Pressure Sensor Circuit ISM – Crankcase Pressure Sensor Circuit electronic engines in the ISM CM871 (2007-09) family used in on-highway and vocational trucks. The crankcase pressure sensor is located in the crankcase filter. The crankcase filter is located on the fuel system side of the engine. Verify the electronic control module (ECM) calibration is correct. If necessary, calibrate the ECM. The troubleshooting section walks through connector and pin inspection, circuit measurements and step-by-step checks, then confirms code 556 is inactive before all fault codes are cleared. Verify engine calibration and coverage against the official Cummins engine support site before ordering parts.
Who needs this Cummins ISM code 556 manual
Any mechanic or workshop owner diagnosing ISM code 556 needs this PDF to follow the factory diagnostic steps in the correct order and avoid replacing parts that are still good. Possible causes of this fault code include: – Crankcase filter needs to be replaced.
Related manuals library
The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
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