Cummins fault code 1843 is the official Cummins troubleshooting manual for the Crankcase Pressure Circuit fault on ISX11.9 CM2250 engines. This 16-page PDF documents SPN 101, FMI 3, and the amber-lamp response, and it walks through the circuit description, the guided diagnostic steps, and the exact conditions for setting and clearing the code. The ECM supplies 5 volts to the crankcase pressure sensor and provides a ground on the sensor return circuit. The sensor signal voltage changes with crankcase pressure, letting the ECM monitor engine condition.
Official document details
| Brand | Cummins |
| Model coverage | ISX11.9 CM2250 and ISX12 CM2250 (2010–2012) |
| System / Group | Diagnostic Trouble Codes (DTCs) — Crankcase Pressure Circuit |
| Fault code | 1843 (SPN 101, FMI 3) |
| Fault description | Crankcase Pressure Circuit — Voltage Above Normal or Shorted to High Source |
| Warning lamp | Amber |
| Reference | Cummins INSITE service tool; Procedure 019-032 (ECM Calibration Code) |
| Pages | 16 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Cummins fault code 1843 table of contents
- Overview and circuit description
- Component location
- Conditions for running the diagnostics
- Conditions for setting fault code 1843
- Action taken when the fault code is active
- Conditions for clearing the fault code
- Shop Talk service notes
- Guided troubleshooting steps and associated procedures
Applicable truck models and engines
This document applies to Cummins ISX11.9 CM2250 and ISX12 CM2250 engines from the 2010–2012 range fitted in heavy-duty on-highway trucks. The SPN 101 / FMI 3 definition and the guided steps follow the same fault-code logic Cummins publishes for its CM2250 platform, so always confirm the ECM calibration on the vehicle against the current revision using the Cummins INSITE electronic service tool. Verify engine coverage on the Cummins official website before ordering parts.
Who needs this Cummins fault code 1843 manual
Any technician or workshop owner diagnosing Cummins fault code 1843 on an ISX11.9 CM2250 engine needs this procedure to work through the fault correctly. A high-source reading usually indicates an open return or a signal shorted to the 5-volt supply, and the guided steps isolate which pin is at fault. The manual ends with the associated-procedures table and the “Reset All Faults” clearing steps so the repair can be validated.
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