This Cummins ISB6.7 2973 document is a diagnostic procedure for Fault Code 2973, covering intake manifold 1 pressure data that is erratic, intermittent, or incorrect. It explains the ECM logic, sensor circuit behavior, possible causes, guided checks, and clearing steps for the amber CHECK ENGINE condition. The file is a compact 18-page PDF for technicians using INSITE™ electronic service tool and Cummins service procedures.
Official Cummins ISB6.7 2973 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISB, ISC, and ISL |
| System/Group | DTCs; Intake Manifold 1 Pressure/Temperature Sensor Circuit |
| Publication no. | Not shown in extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 18 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- FAULT CODE 2973
- 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 barometric pressure sensor.
- Guided Step 3 – Check the engine intake manifold pressure/temperature sensor and circuit.
- Guided Step 4 – Check the ECM and engine harness.
- Guided Step 5 – Check the air intake system for leaks.
- Guided Step 6 – Check the turbocharger speed sensor.
- Guided Step 7 – Check the exhaust and intake systems for restriction.
- Guided Step 8 – Check ECM calibration and clear fault codes.
Applicable truck models
This procedure applies to the Cummins ISB6.7 CM2150 (2007-09) coverage listed for the file, and the extract also identifies ISB, ISC, and ISL intake manifold 1 pressure/temperature sensor circuit diagnostics. It is written around ECM monitoring of the intake manifold pressure sensor, comparison with barometric pressure and turbocharger speed, and related checks for charge-air cooler leaks, intake restriction, exhaust restriction, turbocharger speed sensor resistance, ECM connector pins, and engine harness faults. For official engine and service information, visit Cummins official website.
Who needs this Cummins ISB6.7 2973 manual
This ISB fault code manual is intended for diesel mechanics, fleet technicians, and workshop owners diagnosing Fault Code 2973 with INSITE™ electronic service tool. It is useful when the ECM logs an intake manifold pressure signal that is too high, too low, not changing with operating conditions, or erratic at key ON.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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