This fault code 122 DTCs document is a troubleshooting manual for the Intake Manifold 1 Pressure Sensor Circuit voltage above normal fault. It explains circuit operation, fault conditions, ECM response, connector inspections, sensor supply checks, and final code clearing steps for Cummins ISB, ISC, and ISL applications.
Official fault code 122 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB, ISC, and ISL; ISB6.7 CM2150 (2007-09) |
| System/Group | DTCs; Intake Manifold 1 Pressure Sensor |
| Publication no. | Not shown in extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 14 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 122
- 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 intake manifold pressure sensor and circuit
- Guided Step 3 – Check the ECM and engine harness
- Guided Step 4B – Clear the inactive fault codes
Applicable truck models
This file applies to Cummins ISB, ISC, and ISL engines using the Intake Manifold 1 Pressure Sensor diagnostic, with the library classification listing ISB6.7 CM2150 (2007-09). The procedure identifies the sensor location in the air intake horn and directs the technician to use engine diagrams, circuit diagrams, or wiring diagrams for connector pin identification. It does not list specific truck chassis models. For brand information, see the official Cummins website.
Who needs this fault code 122 DTCs manual
This manual is for diesel mechanics and workshop owners diagnosing an amber CHECK ENGINE lamp, high intake manifold pressure signal voltage, or possible derate caused by Fault Code 122. It is useful when using INSITE™ electronic service tool to check active and inactive faults, verify Fault Code 227, test 4.75 to 5.25 VDC supply voltage, inspect sensor and ECM connector pins, and decide whether harness repair or ECM authorization is required.
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