This fault code 691 DTCs document is a troubleshooting PDF for a high-voltage turbocharger compressor inlet air temperature sensor circuit fault. It explains the fault reason, engine response, component notes, diagnostic conditions, and guided checks using INSITE™ electronic service tool. The file is suited to workshop diagnosis of Code 691 on the engine family shown in the extract.
Official fault code 691 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); also references ISC and ISL with CM2150 for the turbocharger compressor inlet temperature sensor circuit |
| System/Group | DTCs; Turbocharger 1 Compressor Inlet Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source |
| Publication no. | Not shown in extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 16 |
| 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 turbocharger compressor inlet air temperature sensor and circuit.
- Guided Step 3 – Check the ECM and engine harness.
- Guided Step 4B – Clear the inactive fault codes.
Applicable truck models
This document applies to Cummins ISB with CM2150 coverage in the ISB6.7 CM2150 (2007-09) DTC group. The extract also notes ISC and ISL with CM2150 for the turbocharger compressor inlet temperature sensor circuit, while ISB with CM2150 uses a combination ambient air temperature/pressure sensor located in the OEM intake air plumbing rather than a turbocharger compressor inlet temperature sensor. See the manufacturer at Cummins official website.
Who needs this fault code 691 DTCs manual
Workshop owners, diesel mechanics, and fleet technicians need this fault code 691 DTCs manual when an amber CHECK ENGINE light is active with SPN 1172 FMI 3/3 and an engine power derate. It supports sensor inspection, resistance measurement, ECM connector checks, open return or signal circuit diagnosis, and pin-to-pin short testing.
The procedure identifies possible causes such as an open return circuit in the harness, connectors, or sensor; an open signal circuit or short circuit to a voltage source; and a damaged sensor. It also tells technicians to verify ECM calibration, review QuickServe™ Online calibration revision history, and use Procedure 019-043, 019-360, 019-361, 019-362, 019-395, and 019-134 where applicable.
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