Cummins ISM code 686 is the DiagTechPro reference page for this Cummins diagnostic fault code 686 document, a 7-page PDF sourced from TruckFaultCodes.com (Copyright 2017) covering the lamp: amber turbocharger 1 speed – data erratic, intermittent, or incorrect isx – condition. The turbocharger speed sensor is a variable reluctance speed sensor. It consists of a coil of wire and an iron core. When the condition is detected the ECM logs the fault and illuminates the amber warning lamp.
Cummins ISM code 686 document details
| Brand | Cummins |
|---|---|
| Model coverage | Turbocharger 1 Speed Circuit ISM – Turbocharger 1 Speed Circuit (ISM CM871, 2007-09) |
| System / Group | ISM CM871 (2007-09) / DTCs |
| Fault identifier | Code 686 (PID P103, SPN 103, FMI 2/2) |
| Warning lamp | Amber |
| Source | TruckFaultCodes.com |
| Year / Revision | Copyright 2017 |
| Pages | 7 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Circuit Description
- Component Location
- Shop Talk
- Troubleshooting Steps
- Repair verification and clearing fault codes
Applicable truck models
This document applies to Cummins Turbocharger 1 Speed Circuit ISM – Turbocharger 1 Speed Circuit electronic engines in the ISM CM871 (2007-09) family used in on-highway and vocational trucks. The turbocharger speed sensor is mounted in the center housing of the turbocharger. This fault code is logged when the ECM detects a turbocharger speed that is greater than the speed that is physically achievable by the turbocharger. Usually this indicates a faulty sensor or incorrect speed signals from the turbocharger speed sensor. The troubleshooting section walks through connector and pin inspection, circuit measurements and step-by-step checks, then confirms code 686 is inactive before all fault codes are cleared. Verify engine calibration and coverage against the official Cummins engine support site before ordering parts.
Who needs this Cummins ISM code 686 manual
Any mechanic or workshop owner diagnosing ISM code 686 needs this PDF to follow the factory diagnostic steps in the correct order and avoid replacing parts that are still good. This fault code is logged when the ECM detects a turbocharger speed that is greater than the speed that is physically achievable by the turbocharger.
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