Cummins ISM code 197 identifies a coolant Level – Data Valid But Below Normal Operational Range – Moderately Severe Level on the Cummins ISM CM871 (2007-09) engine, and this five-page PDF documents SPN 111 / FMI 1/18 (PID P111) in full. It sets out the fault description, component location, shop-talk notes, and a step-by-step troubleshooting tree so a technician can confirm and clear the code with a diagnostic tool.
Cummins ISM code 197 document details
| Brand | Cummins |
| Model coverage | ISM CM871 (2007-09) and ISX CM871 (2007-09) |
| System / Group | DTCs / Engine Coolant Level Sensor Circuit |
| PID / SPN / FMI | P111 / SPN 111 / FMI 1/18 |
| Warning lamp | Amber |
| Source | TruckFaultCodes.com fault-code library (© 2017) |
| Pages | 2 |
| File size | 0.2 MB |
| Format / Language | PDF / English |
Fault description and meaning
The coolant level sensor is a switch immersed in the radiator top tank that returns a different signal voltage when it is covered by coolant versus exposed. The ECM supplies 5 volts to the coolant level signal circuit and reads the resulting voltage. This document is filed under fault code 197, coolant Level – Data Valid But Below Normal Operational Range – Moderately Severe Level. The condition raises a amber warning lamp on the dash. Because the sensor shares supply and return wires in the engine harness with other sensors, the manual advises checking for multiple active faults before starting the 197 procedure.
Document table of contents
- Fault code information: PID P111, SPN 111, FMI 1/18, lamp amber
- Description
- Component location
- Shop Talk
- Troubleshooting steps (harness, connector, and ECM checks)
- Circuit-repair verification and code clearing
Applicable truck models
This procedure applies to Cummins ISM CM871 (2007-09) engines. The identical fault code and engine coolant level sensor circuit also appear in the parallel Cummins ISX CM871 (2007-09) listing. The troubleshooting steps inspect the engine coolant level sensor circuit connector pins, verify the 4.75 to 5.25 VDC supply across the sensor, and confirm the fault goes inactive with a diagnostic tool after any repair. Cummins publishes the authoritative service data for these engines on its official website.
Who needs this Cummins ISM code 197 manual
Fleet technicians and workshop owners diagnosing engine coolant level sensor circuit complaints on 2007-09 emissions-era Cummins engines need this sheet to work the fault methodically. It pairs with the wider Cummins ISM CM871 DTC set for full engine-harness coverage.
Related manuals library
The complete PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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