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DATA ERROR on AUX Temp (Auxiliary Temperature) and Settings on Caterpillar ET Software

AUX Temp (Auxiliary Temperature)
AUX Temp Sensor is optional equipment, with CAT P/N 370-3830.
-Additional installed for the Zone 2 Area or Hazardous Location,
-Installed on Explosion Protection Engine Kit (such as “Pyroban”) at Exhaust Manifold.

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Troubleshoot AUX Temp – DATA ERROR
Check/measuring the resistance of AUX Temp Sensor (2-cables), Std: approx. 40K ohms.
If measured:
-“0 ohm” it means Shorted (damaged), with Error SPN 441 – FMI 4 (1836-4)
-“M ohm” (no resistance) it means Open (damaged), with Error SPN 441 – FMI 3 (1836-3)

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-Replace with new AUX Temp Sensor, done.

Setting “High Auxiliary Temperature” – Warning/ Shutdown Message
1. Connect Cat ET 3 Software, click on menu “Service” then “Monitoring System”.
Read More: How to Connecting Caterpillar ET Software to the ECM

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2. Click on “High Auxiliary Temperature”, and set on Trip Point (Deg F) tab.

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3. When actual reading on AUX Temp sensor reached the Trip Point (Deg F), will displays Error Code: SPN 441 – FMI 15 (E445). To disabled, set on “State” tab from “On” to “Off”.

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Disabled (NO DATA) – Auxiliary Temperature Sensor Installation Status
1. Click on “Service” and “Configuration Tool”

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2. Expand All, and click on “Auxiliary Temperature Sensor Installation Status”

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3. Change “Current Value” from “Installed” to “Not Installed” and click “OK”, then click “Yes”.

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4. Need to restart the power supply to unit, after change has been made.

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