Cummins ISL9 1669 2wire is a 5-page Cummins diagnostic procedure for ISL9 CM2350 (2013-17). The extract identifies Fault Code 1669, SPN 1761, FMI 3 and describes the reported condition as AFTERTREATMENT DIESEL EXHAUST FLUID TANK LEVEL SENSOR CIRCUIT – VOLTAGE ABOVE NORMAL OR SHORTED TO HIGH SOURCE Aftertreatment Diesel Exhaust Fluid Tank Level Sensor Circuit. This PDF is a workshop reference for confirming the recorded fault before repair decisions are made.
Official Cummins ISL9 1669 2wire document details
| Brand | Cummins |
| Model coverage | ISL9 CM2350 (2013-17) |
| System / Group | Engine diagnostics |
| Publication no. | Fault Code 1669 |
| Year / Revision | Not stated in extract |
| Pages | 5 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Circuit description
- Component location
- Fault-code reason and effect
- Diagnostic conditions
- Troubleshooting steps
- Fault-code clearing
Applicable truck models
This document is filed for ISL9 CM2350 (2013-17). Confirm the installed engine, ECM application, and vehicle configuration before applying the procedure. It concerns Fault Code 1669; keep the displayed fault status and document identification with the job record. Where the document directs use of a diagnostic tool, wiring information, or manufacturer data, those supporting materials are part of a complete diagnosis. Consult Cummins official support for current product information.
Who needs this Cummins ISL9 1669 2wire manual
Technicians investigating Fault Code 1669 can use this ISL9 1669 2wire reference to review the stated circuit or system, identify the conditions noted in the extract, and follow the documented checks in sequence. The procedure keeps Fault Code 1669, SPN 1761, FMI 3 associated with the specific diagnostic event.
Use this reference as a document guide, not as a substitute for measuring the vehicle. Record the code state, configuration, diagnostic-tool result, and inspections performed. Compare each result with the criteria printed in the PDF. If the procedure calls for a connector, sensor, circuit, or ECM check, identify the applicable component on the vehicle before action. This keeps the repair record tied to the source document and actual fault event.
Read the complete ISL9 1669 2wire procedure before replacing parts. After the listed checks are complete, verify the repair and clear the fault only as specified. The full PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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