This 8-page PDF is a Cummins 3716 fault code troubleshooting guide covering Fault Code 3716 — Engine Speed At Idle, Data Valid But Below Normal Operational Range, Moderately Severe Level — for ISX11.9 CM2250 and ISX15 CM2250 engines. It provides the circuit description, diagnostic conditions, step-by-step guided troubleshooting procedures, and ECM calibration verification instructions.
Official Cummins 3716 fault code document details
| Brand | Cummins |
| Model coverage | ISX11.9 CM2250, ISX15 CM2250 |
| System / Group | Diagnostic Trouble Codes (DTCs) — Engine Speed At Idle |
| Publication no. | Not specified |
| Year / Revision | Last Modified 11-Jun-2010 |
| Pages | 8 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview — Circuit Description, Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes (SPN 188, FMI 18)
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk — Possible Causes
- Associated Procedures — ECM Calibration Code (Procedure 019-032)
- Step 1: Check for Active Fault Codes (Steps 1A, 1B)
- Step 2: Check the Engine RPM (Steps 2A, 2B, 2C)
- Step 3: Check ECM Calibration and Clear Fault Codes (Steps 3A, 3B)
Applicable truck models
This document applies to vehicles equipped with the Cummins ISX11.9 CM2250 or ISX15 CM2250 electronic engine platform. Fault Code 3716 (SPN 188, FMI 18) triggers when the ECM detects engine speed 50 rpm below governed idle speed for 30 seconds. The amber CHECK ENGINE lamp and/or MIL illuminates after the diagnostic fails on two consecutive trips. The guide references related Fault Codes 689 and 778 for crankshaft and camshaft position sensor inspection, plus ECM Calibration Procedure 019-032 (Bulletin 4022250 for ISX15, Bulletin 2883445 for ISX11.9). Diagnostics require INSITE™ electronic service tool for reading fault codes, monitoring engine speed, and performing calibration updates. Possible root causes listed include fuel system malfunction, crankshaft or camshaft position sensor malfunction, and increased engine accessory load from alternators, refrigerant pumps, hydraulic pumps, or air compressors. For official Cummins technical resources, visit the Cummins corporate website.
Who needs this Cummins 3716 fault code manual
Diesel mechanics and workshop owners servicing trucks with ISX11.9 or ISX15 CM2250 engines will use this guide when Fault Code 3716 appears. It walks through each diagnostic step — from verifying the active fault and checking related fuel-system or sensor codes through inspecting accessory loads and confirming ECM calibration — ensuring a systematic repair path.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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