This code 691 DTCs document is a troubleshooting PDF for the turbocharger 1 compressor intake temperature circuit. It explains the voltage-above-normal or short-to-high-source condition, related ECM actions, sensor checks, harness tests, and clearing steps used with INSITE™.
Official code 691 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also references ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, ISX15 CM2250, QSL9 CM2250, QSB6.7 CM2250, ISF2.8 CM2220, ISF3.8 CM2220, ISL8.9 CM2150, ISZ13 CM2150, and GX CM2250 in associated procedures. |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs |
| Publication no. | 4022254 for ISB6.7 CM2250 associated procedures |
| Year/Revision | Last Modified: 20-Jan-2011; summary section Last Modified: 11-Jun-2010 |
| Pages | 17 |
| File size | 0.2 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 Fault Code 691
- Guided Step 1 – Check the fault codes.
- Guided Step 2 – Check the turbocharger compressor intake air temperature sensor.
- Guided Step 3 – Check the ECM and engine harness.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
The file applies to Cummins electronic engine platforms listed in the procedure table, with primary coverage shown for ISB6.7 CM2250 fault code diagnostics. It describes the turbocharger compressor intake air temperature sensor circuit used on ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, and ISX15 CM2250, and notes that some engines use a combination ambient air pressure/temperature sensor in the OEM intake air plumbing instead. For manufacturer information, visit Cummins official website.
Who needs this code 691 DTCs manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this code 691 DTCs manual when an amber CHECK ENGINE light or MIL is linked to SPN 1172 FMI 3. The procedure supports checks for open return circuits, open signal circuits, shorts to voltage, damaged sensor conditions, ECM connector pin issues, engine harness faults, ECM response, and ECM calibration updates.
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