This code 155 DTCs document is a 4-page diagnostic PDF for an intake manifold temperature fault on ISB6.7 CM2150 engines. It explains the circuit, fault conditions, ECM response, likely causes, and the guided check using INSITE™ electronic service tool.
Official code 155 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09) |
| System/Group | DTCs; Intake Manifold 1 Pressure/Temperature Sensor Circuit |
| Publication no. | Not stated |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 4 |
| File size | 0.2 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 – Monitor intake manifold temperature.
- Guided Step 1A – Use INSITE™ electronic service tool to monitor intake manifold temperature.
Applicable truck models
This file applies to Cummins ISB6.7 CM2150 (2007-09) engine diagnostics. The extract also references service manual support for ISB CM2100 and CM2150, ISBe and ISDe CM2150, B3.3 and QSB3.3 Series Engines, ISC and ISL Engines CM2150, and ISLe CM2150 when following the related intake manifold air temperature symptom tree. For manufacturer information, visit Cummins official website.
Who needs this code 155 DTCs manual
Workshop owners, diesel mechanics, and diagnostic technicians need this file when a truck reports Fault Code: 155, PID: P105, SPN: 105, FMI: 0/0 with a red STOP ENGINE lamp. The procedure helps confirm whether the intake manifold temperature reading matches a known value or a mechanical gauge before replacing the intake manifold pressure/temperature sensor.
The document states that the intake manifold temperature sensor is a variable resistor sensor supplied with 5 volts by the ECM. The ECM uses voltage changes from sensor resistance to determine intake manifold temperature, and the fault sets when intake manifold air temperature is above the engine protection critical limit. When active, the ECM illuminates the red STOP ENGINE light, reduces engine torque, decreases maximum operating speed, and may shut the engine down if Engine Protection Shutdown is enabled. Shop Talk lists possible causes, including restricted air flow through the charge air cooler, an undersized charge air cooler, high turbocharger compressor outlet temperature, and blocked cooling water intake on marine engines.
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