1/4/2021

Fault Code 3531 and 3532 With Updated Engine Control Module (ECM) Calibration Code

Technical Service Bulletin
Technical Service Bulletin: TSB200235
Released Date: 04-Dec-2020
Fault Code 3531 and 3532 With Updated Engine Control Module (ECM) Calibration Code

Fault Code 3531 and 3532 With Updated Engine Control Module
(ECM) Calibration Code
Warranty Statement
The information in this document has no effect on present warranty coverage or repair practices, nor does it authorize TRP or
Campaign actions.

Contents
Product Affected
ISL G CM2180
ISX12 G CM2180 EJ
Issue
Unexpected fault codes log after engine control module (ECM) calibration code update.
Symptom:
After updating the engine ECM calibration code, Fault Code 3531 and/or Fault Code 3532 come active.
Root Cause:
The optional Ambient Temperature Shutdown Override feature has been added to the engine ECM calibration. In certain ECM
calibrations this feature may be enabled by default, causing engines without the appropriate hardware or configurable parameter
settings to log a fault code.
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1/4/2021

Fault Code 3531 and 3532 With Updated Engine Control Module (ECM) Calibration Code

Verification
Confirm that a J1939 datalink connected ambient air temperature sensor is not installed.
Use the recommended Cummins® electronic service tool or equivalent to verify that the Ambient Temperature Override subfeature of the Idle Shutdown section of Features and Parameters shows “Enable”.
Resolution
Use the recommended Cummins® electronic service tool or equivalent to change the following in Features and Parameters:
In the Idle Shutdown section, set Ambient Temperature Override to Disable
In the J1939 Controls section, set OEM Ambient Air Temperature Sensor to Disable
Reason for Change
The Ambient Temperature Override feature has been added. Engines not equipped by the OEM with a datalink connected Ambient
Air Temperature Sensor will log fault codes if the Ambient Temperature Override feature is enabled.
Service Instructions
If Fault Code 3531 or 3532 come active after installation of a calibration update, first verify whether the vehicle has an OEM installed
Ambient Air Temperature Sensor or not. If no sensor exists, use the recommended Cummins® electronic service tool or equivalent to
set the Ambient Temperature Override feature and OEM Ambient Air Temperature Sensor parameters to Disable.
If the sensor is installed, or if the parameters are already disabled, troubleshoot the fault codes.
Publications Affected
Table 1, Publications Affected
Manual Type
Fault Code
Troubleshooting
Manual
Fault Code
Troubleshooting
Manual

Engine
ISX12 G CM2180
EJ

ISX12 G CM2180
EJ

Bulletin Number

Procedure Title

Procedure

Section

4310680

Ambient Air
Temperature
Abnormal Update
Rate

FC3531

TF

4310680

Ambient Air
Temperature –
Received Network
Data in Error

FC3532

TF

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Fault Code 3531 and 3532 With Updated Engine Control Module (ECM) Calibration Code

Document History
Date
2020-12-3

Details
Module Created

Last Modified: 04-Dec-2020

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