This fault code 689 DTCs document is a troubleshooting manual for the engine crankshaft speed/position signal fault on CM2150 engines. It explains the circuit description, fault conditions, diagnostic steps, connector checks, voltage tests, air gap inspection, ECM calibration review, and fault clearing process for Code 689.pdf.
Official fault code 689 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISB, ISC, and ISL with CM2150 |
| System/Group | DTCs; Engine Crankshaft Speed/Position Circuit |
| Publication no. | Not shown |
| Year/Revision | Last Modified: 28-Jul-2010; overview page Last Modified: 20-Jul-2010 |
| Pages | 16 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 689 – Engine Crankshaft Speed/Position – Data Erratic, Intermittent, or Incorrect
- 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 the fault codes
- Guided Step 2 – Check the engine speed sensor and connector
- Guided Step 3 – Check the crankshaft position sensor circuit
- Guided Step 4 – Check ECM calibration and clear fault codes
Applicable truck models
This file applies to Cummins ISB6.7 CM2150 engines from the 2007-09 coverage group. The extract also names ISB, ISC, and ISL with CM2150 for the engine crankshaft speed/position circuit, where the crankshaft position sensor is located on the side of the front gear housing on the intake side of the engine. For official engine and service information, visit Cummins official website.
Who needs this fault code 689 DTCs manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this manual when the amber CHECK ENGINE light is active and INSITE™ reports SPN 190 FMI 2/2 for an erratic, intermittent, or incorrect crankshaft speed/position signal. It supports diagnosis of the 5 volt SUPPLY, SIGNAL, and RETURN circuits, damaged crankshaft position sensor conditions, ECM connector pins, and related engine harness faults.
The procedure starts by checking Fault Code 238 or 239 sensor supply faults, then confirms whether Fault Code 689 is active. It includes inspection for loose connectors, corroded pins, bent or broken pins, moisture, damaged connector seals, dirt, damaged locking tabs, and wire insulation damage. Electrical checks include a 4.75 to 5.25-VDC sensor supply test, resistance checks below 10 ohms for the signal circuit, pin-to-pin short checks, and measurement points at the sensor connector and ECM connector.
The later guided steps cover crankshaft position sensor removal, air gap and target wheel inspection, and verification with INSITE™ after the engine idles for 1 minute. The document lists an air gap range of 0.25 mm [0.009 in] to 2.25 mm [0.089 in] and target runout information from the extract. The repair path may lead to replacing the sensor, repairing or replacing the engine wiring harness, cleaning connector pins, shimming the sensor, replacing the target, or checking ECM Calibration Revision History on QuickServe™ Online.
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