Cummins ISM code 691 is the DiagTechPro reference page for this Cummins diagnostic fault code 691 document, a 6-page PDF sourced from TruckFaultCodes.com (Copyright 2017) covering the lamp: amber turbocharger 1 compressor inlet temperature sensor circuit – voltage above normal, or shorted to high source isx – condition. The compressor inlet air temperature sensor is a variable resistor sensor and is used to measure the temperature of the air entering the compressor inlet of the turbocharger. The electronic control module (ECM) supplies 5 VDC to the compressor inlet temperature signal circuit. When the condition is detected the ECM logs the fault and illuminates the amber warning lamp.
Cummins ISM code 691 document details
| Brand | Cummins |
|---|---|
| Model coverage | Turbocharger Compressor Inlet Temperature Sensor Circuit ISM – Turbocharger Compressor Inlet Temperature Sensor Circuit (ISM CM871, 2007-09) |
| System / Group | ISM CM871 (2007-09) / DTCs |
| Fault identifier | Code 691 (PID P351, SPN 1172, FMI 3/3) |
| Warning lamp | Amber |
| Source | TruckFaultCodes.com |
| Year / Revision | Copyright 2017 |
| Pages | 6 |
| File size | 0.3 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 Turbocharger Compressor Inlet Temperature Sensor Circuit ISM – Turbocharger Compressor Inlet Temperature Sensor Circuit electronic engines in the ISM CM871 (2007-09) family used in on-highway and vocational trucks. The turbocharger compressor inlet air temperature sensor is located in the compressor casing of the turbocharger. 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 691 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 691 manual
Any mechanic or workshop owner diagnosing ISM code 691 needs this PDF to follow the factory diagnostic steps in the correct order and avoid replacing parts that are still good. The turbocharger inlet air temperature sensor shares return wires in the engine harness with other sensors.
Related manuals library
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