This fault code 686 DTCs document is a troubleshooting PDF for the turbocharger speed circuit on CM2150 engines. It explains the fault reason, ECM response, diagnostic conditions, and guided checks for the turbocharger speed sensor, engine harness, ECM connectors, and related electrical faults.
Official fault code 686 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISB, ISC, and ISL with CM2150 |
| System/Group | DTCs; Turbocharger 1 Speed Circuit |
| Publication no. | Not shown in extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 15 |
| 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 intermittent fault condition.
- Guided Step 2 – Check for a failed turbocharger speed sensor.
- Guided Step 3 – Check the engine harness.
- Guided Step 4A – Operate the engine at idle and high idle to check for fault activation.
- Guided Step 5A – Disable the fault code.
- Guided Step 5B – Clear the inactive fault codes.
Applicable truck models
This file applies to Cummins ISB6.7 CM2150 (2007-09) diagnostic coverage in the DTC group. The extract also identifies the system as ISB, ISC, and ISL with CM2150 – Turbocharger 1 Speed Circuit, where Fault Code 686 is set when the ECM detects an invalid turbocharger speed signal above the maximum calibration limit. The component location notes place the turbocharger speed sensor in the center housing of the turbocharger. For official manufacturer information, visit Cummins official website.
Who needs this fault code 686 DTCs manual
Workshop owners, diesel mechanics, and fleet technicians need this manual when diagnosing an amber CHECK ENGINE light linked to Turbocharger 1 Speed – Data Erratic, Intermittent, or Incorrect. It is most useful when checking sensor resistance between 600 and 1600 ohms, verifying greater than 100k ohms to ground, inspecting connector pins, using INSITE™ electronic service tool, and deciding whether to repair the engine harness or replace the turbocharger speed sensor.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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