This document is a Cummins turbocharger fault troubleshooting manual for Fault Code 687 on CM2150 engines. It explains the turbocharger speed sensor circuit, the conditions that set the amber CHECK ENGINE light, and the guided tests used to isolate the cause.
Official Cummins turbocharger fault document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB, ISC, and ISL with CM2150; ISB6.7 CM2150 (2007-09) |
| System/Group | DTCs; Turbocharger 1 Speed Circuit |
| Publication no. | Not shown in extract |
| Year/Revision | Last Modified: 20-Jul-2010; 07-Oct-2010 |
| Pages | 17 |
| 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 barometric pressure or intake manifold pressure sensor faults.
- Guided Step 2 – Check for an intermittent fault condition.
- Guided Step 3 – Check for a damaged turbocharger speed sensor.
- Guided Step 4 – Check the engine harness.
- Guided Step 5 – Check the alternator.
- Guided Step 6 – Check the ECM.
- Guided Step 7 – Clear the fault codes.
Applicable truck models
This file applies to Cummins ISB, ISC, and ISL engines with CM2150 control, with file indexing for ISB6.7 CM2150 (2007-09). The extract identifies Fault Code 687, PID P103, SPN 103, and FMI 1/18 for Turbocharger 1 Speed – Data Valid but Below Normal Operational Range – Moderately Severe Level. The diagnostic runs continuously when the engine is running, and the ECM detects low turbocharger speed when turbocharger speed is below 600 rpm for more than 1 second while engine speed is greater than 1200 rpm. For official manufacturer information, visit Cummins official website.
Who needs this Cummins turbocharger fault manual
Workshop owners, diesel mechanics, and fleet technicians need this Cummins turbocharger fault manual when diagnosing low turbocharger speed complaints, amber CHECK ENGINE events, or active Fault Code 687 on CM2150-equipped engines. The procedure supports checks with INSITE™ electronic service tool, multimeter resistance testing, connector inspection, harness continuity checks, alternator interference checks, ECM verification, and inactive fault clearing.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
Related manuals library
Sản phẩm liên quan cho hãng này
Cùng brand theo taxonomy hiện có trong catalog WooCommerce.
Cummins Calterm Version 5.16 – Advanced ECM Control and Precision Tuning for Cummins Engines
Cummins INSITE 9.3 – The Essential Diagnostic Tool for Cummins Engines
Cummins InCal CE – The Calibration and Configuration Tool for Cummins Engines
