This Cummins fault code 488 document is a diagnostic procedure for an ISB6.7 CM2150 intake manifold temperature fault. It explains the circuit, fault conditions, ECM response, likely charge-air causes, and the INSITE™ check used before repair decisions.
Official Cummins fault code 488 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); references also include ISB CM2100 and CM2150, ISBe and ISDe CM2150, QSB3.3, ISC and ISL CM2150, and ISLe CM2150 service manuals. |
| System/Group | DTCs; intake manifold 1 pressure/temperature sensor; intake manifold air temperature |
| Publication no. | Not stated in this file. Referenced bulletins include 4021578, 4021597, 4021540, 4021569, and 4021630. |
| 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
- FAULT CODE 488
- 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) engines in the DTC group shown by the library record. The sampled pages also direct technicians to related Cummins service manual symptom trees for ISB CM2100 and CM2150, ISBe and ISDe CM2150, QSB3.3, ISC and ISL CM2150, and ISLe CM2150 engines when the INSITE™ temperature value matches a known value or mechanical gauge. For manufacturer information, visit Cummins official website.
Who needs this Cummins fault code 488 manual
Workshop owners, diesel mechanics, and diagnostic technicians need this Cummins fault code 488 manual when an amber lamp and SPN 105 FMI 16 indicate intake manifold air temperature above the engine protection warning limit. The procedure helps separate a sensor reading issue from real high charge-air temperature conditions before replacing the intake manifold temperature sensor.
The circuit description states that the ECM supplies 5 volts to the intake manifold temperature signal circuit and monitors voltage changes caused by thermistor resistance. Cold air produces high resistance and high signal voltage; warm air produces low resistance and low signal voltage. The fault becomes active when the ECM detects intake manifold temperature above a calibratible limit, reduces torque output, and returns maximum torque after temperature drops below the clearing limit.
Shop Talk lists possible causes such as plugged charge air cooler fins, restricted airflow through the charge air cooler, an undersized charge air cooler, and high turbocharger compressor outlet temperature. It also instructs technicians to verify the ECM calibration and check QuickServe® Online calibration revision history before recalibration if needed. Full PDF available in the DiagTechPro manuals library, free account required to download.
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