This 9-page PDF is a complete Cummins ISB6.7 154 154 troubleshooting procedure covering the intake manifold 1 temperature sensor circuit when voltage is below normal or shorted to a low source. The document provides circuit description, fault conditions, engine effects, and a structured step-by-step diagnostic flowchart for identifying and repairing the root cause on CM2350-equipped engines.
Official Cummins ISB6.7 154 154 document details
| Brand | Cummins |
| Model coverage | ISB6.7 CM2350 (2013–2017) |
| System/Group | Diagnostic Trouble Codes (DTCs) — Intake Manifold Temperature Sensor Circuit |
| Publication no. | Not specified |
| Year/Revision | 2017 |
| Pages | 9 |
| File size | 0.4 MB |
| Format | |
| Language | English |
Document table of contents
- Circuit Description
- Component Location
- Reason
- Effect
- 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
- Troubleshooting Steps (Steps 1A through 4B)
Applicable truck models
This procedure applies to all trucks and equipment powered by the Cummins ISB6.7 engine with the CM2350 electronic control module, model years 2013 through 2017. The ISB6.7 CM2350 is commonly found in medium-duty commercial vehicles, school buses, and motorhomes. The fault code is identified as SPN 105, FMI 4, PID P105. When active, the ECM illuminates the amber CHECK ENGINE lamp, disables diesel exhaust fluid injection, disables active and stationary diesel particulate filter regeneration, disables EGR valve operation, and may reduce engine torque over extended operation. The diagnostic runs continuously with the keyswitch ON or the engine running, and the fault sets when signal voltage drops below 0.41 VDC for more than 10 seconds. For official Cummins service resources, visit Cummins official website.
Who needs this Cummins ISB6.7 154 154 manual
Diesel mechanics, fleet maintenance technicians, and workshop owners servicing medium-duty Cummins-powered trucks will use this document to diagnose a low-voltage condition on the intake manifold temperature sensor signal circuit. The step-by-step flowchart guides technicians through connector inspection, circuit response checks, pin-to-pin and pin-to-ground resistance measurements (100k ohm threshold), sensor replacement verification, and ECM calibration review.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
Related manuals library
Related library topics: Cummins ISB6.7 fault code; intake manifold temperature sensor; diesel particulate filter regeneration; Cummins; CM2350 diagnostic trouble code; SPN 105 FMI 4; voltage below normal; shorted to low source.
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