This Cummins ISB fault 1666 document is a troubleshooting PDF for the aftertreatment exhaust gas temperature 1 circuit on CM2150 engines. It explains Fault Code 1666, SPN 3241 FMI 3/3, where high signal voltage is detected at the catalyst inlet temperature sensor circuit. The file is intended for diagnostic work where active diesel particulate filter regeneration is disabled and the amber CHECK ENGINE lamp is active.
Official Cummins ISB fault 1666 document details
| Brand | Cummins |
| Model coverage | ISB, ISC, and ISL with CM2150; file group lists ISB6.7 CM2150 (2007-09) |
| System/Group | Aftertreatment Temperature Sensors / DTCs |
| Publication no. | Not shown in extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 14 |
| 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 the fault codes.
- Guided Step 2 – Check the aftertreatment diesel oxidation catalyst inlet temperature sensor and circuit.
- Guided Step 3 – Check the ECM and OEM harness.
- Guided Step 4 – Clear the fault code.
Applicable truck models
This manual applies to Cummins ISB, ISC, and ISL engines with CM2150 electronic control, with the library group identifying ISB6.7 CM2150 (2007-09). The procedure covers the aftertreatment diesel oxidation catalyst inlet temperature sensor, also identified as aftertreatment exhaust gas temperature 1, located at the inlet of the aftertreatment catalyst. For engine service information and official support, visit Cummins official website.
Who needs this Cummins ISB fault 1666 manual
Workshop owners, diesel technicians, and fleet mechanics need this Cummins ISB fault 1666 manual when diagnosing a voltage above normal or shorted-to-high-source condition in the aftertreatment temperature sensor circuit. The steps use INSITE™ electronic service tool checks, connector inspection, jumper wire circuit response testing, and multimeter resistance measurements on the OEM harness.
The troubleshooting path directs the mechanic to inspect sensor and ECM connector pins for loose connectors, corrosion, bent or broken pins, pushed back or expanded pins, moisture, missing seals, dirt, damaged shells, insulation damage, and locking tab damage. It also covers open RETURN circuit checks, open SIGNAL circuit checks, pin-to-pin short circuit checks greater than 100k ohms, and harness resistance checks less than 10 ohms. Repair outcomes include cleaning connector pins, repairing or replacing the OEM Wiring Harness, replacing the aftertreatment exhaust gas temperature sensor where applicable, verifying inactive Fault Code 1666, and clearing inactive fault codes with INSITE™.
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