This Fault Code 687 DTCs document is a troubleshooting manual for the turbocharger 1 speed circuit on CM2250 engines. It explains the fault logic, sensor circuit description, diagnostic conditions, repair validation, and guided electrical checks using INSITE™ electronic service tool.
Official Fault Code 687 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also lists ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, QSL9 CM2250, QSB6.7 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; associated bulletin numbers include 4022254, 4022257, 4022250, 2883445, 4022256, 4022255, and 4022190 |
| Year/Revision | Unknown; last modified 11-Jun-2010 and 18-Jan-2011 |
| Pages | 19 |
| 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 1A – Read the fault codes with INSITE™ electronic service tool
- Guided Step 2A – Operate the engine and confirm that the turbocharger speed fault becomes active
- Guided Step 3 – Check for a malfunction in the turbocharger speed sensor
- Guided Step 4 – Check the engine harness
- Guided Step 6 – Check the ECM
Applicable truck models
This file applies to Cummins CM2250 engine diagnostics where Fault Code: 687, PID: P103, SPN: 103, FMI: 18 is used for Turbocharger 1 Speed – Data Valid But Below Normal Operating Range – Moderately Severe Level. The extract identifies the turbocharger speed sensor as a variable reluctance speed sensor mounted in the center housing of the turbocharger, with checks for sensor resistance, connector pins, engine harness continuity, short circuits to ground, alternator influence, ECM calibration, and ECM operation. See the engine maker at Cummins official website.
Who needs this Fault Code 687 DTCs manual
Workshop owners, fleet technicians, and diesel mechanics need this manual when an amber CHECK ENGINE lamp or MIL is linked to low detected turbocharger speed and possible engine power derate. It is useful for confirming active and inactive status, checking related Fault Codes 122, 123, 221, or 222, and validating repair by running the engine at at least 1200 RPM for 1 minute.
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