The Cummins ISM code 1942 service document is a 4-page PDF fault-code sheet that covers the Crankcase Pressure fault (code 1942) on Cummins ISM CM871 engines. It sets out the SPN, FMI and warning-lamp data, a plain-language description of the crankcase pressure sensor, and the step-by-step checks a technician follows to confirm, repair and clear the fault.
Official document details
| Brand | Cummins |
| Model coverage | ISM CM871 (2007-09) / DTCs; ISX CM871 (2007-09) / DTCs |
| System / group | ISM CM871 (2007-09) / DTCs |
| Fault code | 1942 (PID P101, SPN 101, FMI 2) |
| Warning lamp | Amber |
| Source | TruckFaultCodes reference, Copyright © 2017 |
| Pages | 4 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Description
- Shop Talk
- Component Location
- Troubleshooting Steps
- Circuit Diagram
Applicable truck models
This fault-code sheet applies to Cummins ISM CM871 (2007-09) engines and, where noted in the document, the related ISX CM871 platform used in on-highway trucks fitted with the crankcase pressure sensor. Verify that the ECM calibration matches the engine before starting diagnosis. Current engine specifications and service policy are published on the Cummins official website.
Cummins ISM code 1942 troubleshooting steps
The crankcase pressure sensor is used to monitor the pressure inside the crankcase. The electronic control module (ECM) supplies the crankcase pressure sensor a 5 volt reference voltage. When the crankcase pressure is low, the sensor signal voltage is low. When the crankcase pressure is high, the sensor signal voltage is near the 5 volt reference voltage. The troubleshooting routine walks through key-on diagnostic-tool checks, inspection of the crankcase pressure sensor, and verifying that the fault goes inactive after the repair. The sheet reports fault code 1942 with SPN 101, FMI 2 and an amber lamp so the technician can confirm the right diagnostic tree.
Who needs this Cummins ISM code 1942 manual
Heavy-duty truck technicians and workshop owners diagnosing the crankcase pressure sensor on Cummins ISM CM871 engines need this reference. It documents the fault code 1942 conditions, likely causes and the checks required to close the repair correctly the first time.
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