This code 122 DTCs document is a troubleshooting procedure for the intake manifold pressure sensor circuit on ISB6.7 CM2350 engines. It explains the circuit description, fault setting conditions, ECM actions, connector checks, voltage tests, harness checks, ECM response checks, calibration review, and final fault clearing steps.
Official code 122 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2350 (2013-17) |
| System/Group | DTCs; intake manifold 1 pressure sensor circuit |
| Publication no. | Not shown in extract |
| Year/Revision | Unknown; copyright 2017 shown |
| Pages | 9 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault Code: 122
- PID: P102
- SPN: 102
- FMI: 3/3
- LAMP: Amber
- INTAKE MANIFOLD 1 PRESSURE SENSOR CIRCUIT – VOLTAGE ABOVE NORMAL OR SHORTED TO HIGH SOURCE
- CIRCUIT DESCRIPTION
- COMPONENT LOCATION
- REASON
- EFFECT
- 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
- TROUBLESHOOTING STEPS
- Step 1A) Check for sensor supply fault codes.
- Step 1B) Check for an inactive fault code.
- Step 2A) Inspect the intake manifold pressure sensor and connector pins.
- Step 2B) Check the circuit response.
- Step 2C) Check the sensor supply voltage and return circuit.
- Step 2D) Check the fault codes and verify sensor condition.
- Step 3A) Inspect the ECM and engine harness connector pins.
- Step 3A-1) Check the ECM response.
- Step 3A-2) Check for an active fault code.
- Step 3B) Inspect the ECM and engine harness connector pins.
- Step 3B-1) Check the sensor supply voltage and return circuit.
- Step 3B-2) Check for an active fault code.
- Step 4A) Check if an ECM calibration update is available.
- Step 4B) Disable the fault code.
Applicable truck models
This file applies to Cummins ISB6.7 CM2350 engines from the 2013-17 coverage group, specifically the DTC procedure for Fault Code 122 on the intake manifold 1 pressure/temperature sensor located in the air intake horn. The extract does not list truck makes or chassis models, so application should be confirmed by engine family, ECM platform, active fault code, and wiring diagram. For official engine information, visit Cummins.
Who needs this code 122 DTCs manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this procedure when the amber CHECK ENGINE lamp or MIL is active and the ECM reports high signal voltage above 4.75-VDC for more than 5 seconds. It supports checks for open return circuits, signal shorts to sensor supply or battery voltage, damaged connector pins, harness faults, a malfunctioning intake manifold pressure/temperature sensor, and ECM calibration status.
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