This Cummins ISB6.7 155 document is a 4-page troubleshooting PDF for Fault Code 155 on ISB6.7 CM2350 engines. It explains the intake manifold 1 temperature circuit, the RED lamp condition, the engine protection response, and the checks used to confirm whether the sensor reading is valid.
Official Cummins ISB6.7 155 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2350 (2013-17) |
| System/Group | DTCs; Intake Manifold 1 Temperature |
| Publication no. | Not shown in extract |
| Year/Revision | Unknown; copyright 2017 shown in document extract |
| Pages | 4 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- Fault Code: 155
- PID: P105
- SPN: 105
- FMI: 0/0
- Lamp: RED
- Intake Manifold 1 Temperature – Data Valid but Above Normal Operational Range – Most Severe Level
- 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) Monitor intake manifold air temperature reading.
- Step 2A) Check if an ECM calibration update is available.
- Step 2B) Disable the fault code.
Applicable truck models
This file applies to Cummins ISB6.7 CM2350 engines in the 2013-17 coverage group, specifically for DTC troubleshooting of Fault Code 155. The document identifies the intake manifold 1 pressure/temperature sensor location as the air intake horn and states that the ECM supplies 5 volts to the intake manifold temperature signal circuit while monitoring sensor resistance changes. For official engine and service information, visit Cummins official website.
Who needs this Cummins ISB6.7 155 manual
Workshop owners, diesel technicians, and fleet maintenance staff use this Cummins ISB6.7 155 manual when a diagnostic tool reports SPN 105 FMI 0/0 with a red STOP ENGINE lamp. It is most useful when confirming whether high charge-air temperature, restricted air flow through the charge-air cooler, an undersized charge-air cooler, high turbocharger compressor outlet temperature, or a faulty intake manifold air temperature sensor is involved.
The troubleshooting flow starts with the keyswitch ON and the diagnostic tool connected. The technician monitors the intake manifold air temperature value and compares the diagnostic reading against a mechanical gauge or known value. If the value correlates, the document directs the user to the Intake Manifold Air Temperature Above Specification symptom tree in the appropriate service manual. If it does not correlate, the intake manifold air temperature sensor is replaced before moving to the next check.
The later procedure checks whether an ECM calibration update is available by comparing the ECM code and revision number with the ECM Calibration Revision History. The final validation uses the stated clearing conditions: perform a key cycle, start the engine, let it idle for 1 minute, and confirm that the fault code status changes to INACTIVE after the diagnostic runs and passes. The full PDF is available in the DiagTechPro manuals library, free account required to download.
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