fault code 234 DTCs is documented on this DiagTechPro library page for Cummins ISM CM871 (2007-09) engines, where it flags a Engine Crankshaft Speed/Position – Data Valid But Above Normal Operational Range – Most Severe Level condition (PID P190, SPN 190, FMI 0/0, Red lamp). This 3-page PDF reproduces the manufacturer description, shop talk, component location and step-by-step troubleshooting so technicians can confirm and clear the code.
fault code 234 DTCs overview
Cummins defines this code as “ENGINE CRANKSHAFT SPEED/POSITION – DATA VALID BUT ABOVE NORMAL OPERATIONAL RANGE – MOST SEVERE LEVEL” on the Camshaft Position Sensor and Engine Speed Sensor Circuit. The crankshaft position and camshaft position sensors are hall effect type sensors. The electronic control module (ECM) provides a 5-volt supply to the position sensor and a return circuit. As the teeth on the crankshaft speed ring or the dimples in the back of the camshaft gear move past the position sensor, a signal is generated on the position sensor signal circuit. The ECM interprets this signal and converts it to an engine speed.
According to the shop talk notes, possible causes include:
- External fuel sources drawn into the intake air passage.
- Reverse powering (motoring) of the engine.
- Tampering of the engine speed/position sensors.
Official document details
| Brand | Cummins |
| Model coverage | Cummins ISM CM871 (2007-09); Cummins ISX CM871 (2007-09) |
| System / Group | Camshaft Position Sensor and Engine Speed Sensor Circuit — ISM CM871 fault codes |
| Fault code | 234 (SPN 190, FMI 0/0) |
| Source | TruckFaultCodes.com Cummins fault code reference (© 2017) |
| Pages | 3 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification (PID, SPN, FMI, lamp)
- Description
- Shop Talk
- Component Location
- Troubleshooting Steps
Applicable truck models and engines
This document applies to Cummins ISM CM871 (2007-09); Cummins ISX CM871 (2007-09) equipped diesel engines that log Fault Code 234. Always confirm engine calibration and use a Cummins diagnostic tool such as INSITE to read live data before starting repairs. Full specifications are published on the Cummins official website.
Who needs this fault code 234 DTCs manual
Heavy-duty truck technicians, fleet workshops and owner-operators diagnosing an electronic control module warning on ISM CM871 engines will use this sheet to verify the fault before parts are replaced.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
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