ISM code 187 DTCs identifies a sensor Supply 2 Circuit – Voltage Below Normal or Shorted to Low Source on the Cummins ISM CM871 (2007-09) engine, and this five-page PDF documents SPN 3510 / FMI 4/4 (PID S211) 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.
ISM code 187 DTCs document details
| Brand | Cummins |
| Model coverage | ISM CM871 (2007-09) |
| System / Group | DTCs / Sensor Supply 2 Circuit |
| PID / SPN / FMI | S211 / SPN 3510 / FMI 4/4 |
| Warning lamp | Amber |
| Source | TruckFaultCodes.com fault-code library (© 2017) |
| Pages | 11 |
| File size | 0.2 MB |
| Format / Language | PDF / English |
Fault description and meaning
Sensor supply number 2 of the ECM provides a 5-VDC supply to the backup camshaft position sensor, the exhaust gas pressure sensor, the intake manifold pressure/temperature sensor, and the crankcase pressure sensor. Low voltage on this line can be caused by a short to ground in a supply line. This document is filed under fault code 187, sensor Supply 2 Circuit – Voltage Below Normal or Shorted to Low Source. 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 187 procedure.
Document table of contents
- Fault code information: PID S211, SPN 3510, FMI 4/4, 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, where this circuit is specific to the ISM electronic control module. The troubleshooting steps inspect the sensor supply 2 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 ISM code 187 DTCs manual
Fleet technicians and workshop owners diagnosing sensor supply 2 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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