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Home >> Chrysler >> 2009 >> 300 Signature Series >> Repair and Diagnosis >> External Pages >> Different car >> Section 272 (Nag1 Automatic Transmission - Electrical Diagnostics) >> Nag1 - Electrical Diagnostics >> DTC Troubleshooting >> U0424-Implausible Data Received From HVAC Control Module >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2008 Dodge Magnum, 2008 Dodge Charger, and 2008 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR FCM CAN BUS DTCS 

    With the scan tool, read FCM DTCs.

    Are there any FCM CAN BUS DTCs present? 

    Yes 

    1. Refer to ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS article and perform the appropriate symptom.
    2. Perform NAG1 TRANSMISSION VERIFICATION TEST .

    No 

    1. Go To  2.
  2. CHECK IF HVAC DTCS ARE PRESENT 

    With the scan tool, read HVAC DTCs.

    Are there any HVAC DTCs present? 

    Yes 

    1. Refer to HVAC - ELECTRICAL DIAGNOSTICS and perform the appropriate symptom.
    2. Perform NAG1 TRANSMISSION VERIFICATION TEST .

    No 

    1. Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the TCM per the Service Information. Refer to DESCRIPTION .
    2. Perform NAG1 TRANSMISSION VERIFICATION TEST .
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