Cummins fault code 686 is the Cummins ISX11.9 CM2250 diagnostic document for the turbocharger 1 speed sensor circuit, logged as SPN 103, FMI 2 with a amber lamp. There is no effect on performance because the ECM substitutes an estimated turbocharger speed while the fault is active. The turbocharger speed sensor is a variable reluctance sensor mounted in the turbocharger center housing; the code sets when the ECM detects an invalid or physically impossible speed signal. This DiagTechPro library page outlines what the official Cummins troubleshooting procedure contains before you download the full PDF.
Cummins fault code 686 document details
| Brand | Cummins |
| Model coverage | ISX11.9 CM2250 (2010-12), ISX12 CM2250 (2010-12) |
| System / Group | Turbocharger 1 Speed Circuit — DTCs |
| Fault code / SPN / FMI | 686 / SPN 103 / FMI 2 |
| PID / Lamp | P103 / Amber |
| Year / Revision | Last modified 11-Jun-2010 |
| Pages | 2 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- Overview and 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 and troubleshooting steps
Applicable truck models and engines
This Cummins DTC applies to ISX11.9 CM2250 (2010-12) and ISX12 CM2250 (2010-12) engines, and the shared circuit information also references the ISB6.7, ISC8.3, ISL9 and ISX15 CM2250 platforms. Always match the turbocharger speed sensor wiring against the OEM diagram before testing, and confirm the diagnosis with the Cummins INSITE electronic service tool. Full engine specifications are published on the official Cummins website.
Who needs this Cummins fault code 686 manual
Workshop technicians, fleet maintenance teams and owner-operators diagnosing a turbocharger speed sensor concern on ISX11.9 or ISX12 CM2250 engines use this document to read the CM2250 diagnostic conditions, the action the ECM takes, and the exact steps to clear the code.
The complete PDF (2 pages) is available in the DiagTechPro manuals library; a free account is required to download it. This reference copy helps technicians prepare parts and test steps before servicing the engine.
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