The Cummins ISM code 1934 service document is a 2-page PDF fault-code sheet that covers the ECU Power Output Supply Voltage 2 fault (code 1934) on Cummins ISM CM871 engines. It sets out the SPN, FMI and warning-lamp data, a plain-language description of the EGR valve, 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 | 1934 (PID S211, SPN 3598, FMI 1/18) |
| Warning lamp | Amber |
| Source | TruckFaultCodes reference, Copyright © 2017 |
| Pages | 2 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- Description
- Shop Talk
- Component Location
- Troubleshooting Steps
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 EGR valve. 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 1934 troubleshooting steps
The exhaust gas recirculation (EGR) valve is a smart device and receives commands from the engine electronic control module (ECM) via the J1939 datalink. The EGR valve performs its datalink. The EGR valve is opened by a motor located on top of the EGR valve. The troubleshooting routine walks through key-on diagnostic-tool checks, inspection of the EGR valve, and verifying that the fault goes inactive after the repair. The sheet reports fault code 1934 with SPN 3598, FMI 1/18 and an amber lamp so the technician can confirm the right diagnostic tree.
Who needs this Cummins ISM code 1934 manual
Heavy-duty truck technicians and workshop owners diagnosing the EGR valve on Cummins ISM CM871 engines need this reference. It documents the fault code 1934 conditions, likely causes and the checks required to close the repair correctly the first time.
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