Detroit 12.7 DDEC 4 Interesting problem

Discussion in 'Trucks [ Eighteen Wheelers ]' started by eagle005, Feb 10, 2015.

  1. simonsocm

    simonsocm Light Load Member

    Aug 17, 2019
    Pretty sure OP had the sensor calibration in the ecm wrong.

    I'm having a similar issue with my coolant temp sensor currently and I'm really thinking it's a calibration issue.

    So far I've swapped the sensor and mechanical gauge and the engine harness. Nothing has changed. ECM always shows temperature at 12 degrees below actual.

    I also found this online that explains a bit.

    Going from a DDEC III to DDEC IV ECM? Do Yourself A Favor And Verify Your Temperature Sensor Readings - Diesel Control - Magazine - Movin' Out
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