This Turbocharger Speed Sensor DTCs manual is a troubleshooting document for Fault Code 686 on CM2250 engine platforms. It explains the turbocharger 1 speed circuit, the erratic or incorrect signal condition, and the diagnostic checks used with INSITE™ electronic service tool. The file is supplied as Code 686.pdf for workshop reference.
Official Turbocharger Speed Sensor DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also references ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, and ISL8.9 CM2150 SN in associated procedures |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Turbocharger 1 Speed Circuit |
| Publication no. | Not stated in the extract; associated bulletin number for ISB6.7 CM2250 is 4022254 |
| Year/Revision | Year unknown; last modified dates shown: 11-Jun-2010 and 04-Jan-2011 |
| Pages | 16 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- 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
- Troubleshooting Steps
- Guided Step 1 – Check for an intermittent fault condition.
- Guided Step 2 – Check for a malfunctioning turbocharger speed sensor.
- Guided Step 3 – Check the engine harness.
- Guided Step 4 – Connect all components and determine if the fault code reoccurs.
- Guided Step 5 – Check ECM calibration and clear fault codes.
Applicable truck models
The document applies to Cummins engines using the Turbocharger 1 Speed Circuit, with the file group identifying ISB6.7 CM2250 and the associated procedure table listing ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, and ISL8.9 CM2150 SN. It covers Fault Code 686, PID P103, SPN 103, FMI 2, where the ECM detects a turbocharger speed signal that is invalid, erratic, intermittent, incorrect, or greater than a speed physically achievable by the turbocharger. For manufacturer information, visit Cummins official website.
Who needs this Turbocharger Speed Sensor DTCs manual
This Speed Sensor DTCs manual is for diesel mechanics, fleet technicians, and workshop owners diagnosing an amber CHECK ENGINE lamp caused by Fault Code 686. It supports inspection of the sensor connector, pigtail harness, engine harness, ECM connector pins, sensor resistance, shorts to ground, pin-to-pin shorts, ECM calibration status, and fault clearing with INSITE™.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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