Cummins ISM code 689 is the DiagTechPro reference page for this Cummins diagnostic fault code 689 document, a 14-page PDF sourced from TruckFaultCodes.com (Copyright 2017) covering the lamp: amber engine crankshaft speed/position – data erratic, intermittent, or incorrect ism – condition. The electronic control module (ECM) provides a 5 VDC supply to the engine camshaft speed/position sensor on the sensor supply circuit. The ECM also provides a ground on the sensor return circuit. When the condition is detected the ECM logs the fault and illuminates the amber warning lamp.
Cummins ISM code 689 document details
| Brand | Cummins |
|---|---|
| Model coverage | Camshaft Engine Speed Sensor Circuit (ISM CM871, 2007-09) |
| System / Group | ISM CM871 (2007-09) / DTCs |
| Fault identifier | Code 689 (PID P190, SPN 190, FMI 2/2) |
| Warning lamp | Amber |
| Source | TruckFaultCodes.com |
| Year / Revision | Copyright 2017 |
| Pages | 14 |
| File size | 0.6 MB |
| Format | |
| Language | English |
Document table of contents
- Circuit Description
- Component Location
- Shop Talk
- Troubleshooting Steps
- Repair verification and clearing fault codes
Applicable truck models
This document applies to Cummins Camshaft Engine Speed Sensor Circuit electronic engines in the ISM CM871 (2007-09) family used in on-highway and vocational trucks. Both engine position sensors are located on the back side of the front gear housing above the fuel pump drive. The primary engine position sensor (Number 1) is located above the backup engine position sensor (Number 2). Verify the electronic control module (ECM) calibration is correct. If necessary, recalibrate the ECM. The troubleshooting section walks through connector and pin inspection, circuit measurements and step-by-step checks, then confirms code 689 is inactive before all fault codes are cleared. Verify engine calibration and coverage against the official Cummins engine support site before ordering parts.
Who needs this Cummins ISM code 689 manual
Any mechanic or workshop owner diagnosing ISM code 689 needs this PDF to follow the factory diagnostic steps in the correct order and avoid replacing parts that are still good. This fault is logged when the ECM does not receive a valid engine speed signal.
Related manuals library
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