This fault code 187 DTCs document is a troubleshooting procedure for Sensor Supply 2 Circuit voltage below normal or shorted to low source. It explains the fault reason, affected 5 VDC sensor supply circuit, diagnostic conditions, engine derate effect, guided checks, and repair validation with INSITE™ electronic service tool.
Official fault code 187 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; associated coverage shown for ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, ISX15 CM2250, GX CM2250, QSL9 CM2250, and QSB6.7 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs |
| Publication no. | 4022254 for ISB6.7 CM2250; associated tables also list 4022257, 4022250, 2883445, 4022256, and 4022255 |
| Year/Revision | Year unknown; sections show Last Modified: 11-Jun-2010 and 30-Dec-2010 |
| Pages | 23 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- FAULT CODE 187 – Sensor Supply 2 Circuit – Voltage Below Normal or Shorted to Low Source
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Associated Procedures
- Guided Step 1 – Check the fault codes
- Guided Step 2 – Check the sensors and circuits connected to the sensor number 2 supply and return
- Guided Step 3 – Check the ECM
- Guided Step 4B – Disable the fault code
Applicable truck models
The procedure applies to Cummins CM2250 engine applications named in the document, including ISB6.7 CM2250 and related associated-procedure coverage for ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, ISX15 CM2250, GX CM2250, QSL9 CM2250, and QSB6.7 CM2250. The affected circuit supplies 5 VDC from the ECM to sensors such as the camshaft position sensor, intake manifold pressure/temperature sensor, crankcase pressure sensor, engine oil pressure sensor if equipped, turbocharger compressor intake pressure/temperature sensor if equipped, and barometric pressure sensor if equipped. For manufacturer information, visit Cummins official website.
Who needs this fault code 187 DTCs manual
Workshop technicians, diesel mechanics, and fleet repair managers need this code 187 DTCs manual when an amber CHECK ENGINE lamp or MIL is linked to Sensor Supply 2 Circuit low voltage. It supports connector inspection, circuit response checks, ECM inspection, calibration review, and final fault-code clearing steps.
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