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Home >> Chrysler >> 2009 >> 300 Signature Series >> Repair and Diagnosis >> External Pages >> Different car >> Section 248 ((HVAC Systems - Electrical Diagnostics)) >> HVAC - Electrical Diagnostics >> DTC Troubleshooting >> B1031-Evaporator Fin Temperature Sensor Circuit Low (ATC) >> 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 DTC B1031-EVAPORATOR FIN TEMPERATURE SENSOR CIRCUIT LOW WITH EVAPORATOR TEMPERATURE SENSOR HARNESS CONNECTOR DISCONNECTED 
    Fig 1: Checking Evaporator Temperature Sensor Circuit
    GC0013834Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the Evaporator Temperature Sensor harness connector.

    Turn the ignition on.

    With the scan tool, erase HVAC DTCs.

    Turn the ignition off, wait 10 seconds, and turn the ignition on.

    With the scan tool, read HVAC DTCs.

    Does the scan tool display: B1031-EVAPORATOR FIN TEMPERATURE SENSOR CIRCUIT LOW? 

    Yes 

    1. Go To  2.

    No 

    1. Replace the Evaporator Temperature Sensor in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  2. CHECK (C21) EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    Fig 2: Checking Evaporator Temperature Sensor Signal Circuit
    GC0013865Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the A/C Heater Control C2 harness connector.

    Measure the resistance of the (C21) Evaporator Temperature Sensor Signal circuit between ground and the A/C Heater Control C2 harness connector.

    Is the resistance below 10k ohms? 

    Yes 

    1. Repair the (C21) Evaporator Temperature Sensor Signal circuit for a short to ground.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Go To  3.
  3. CHECK (C21) EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO (C121) SENSOR GROUND CIRCUIT 
    Fig 3: Measuring Resistance Between Evaporator Temperature Sensor Signal Circuit & Ground Circuit
    GC0013866Courtesy of CHRYSLER LLC

    Measure the resistance between the (C21) Evaporator Temperature Sensor Signal circuit and the (C121) Sensor Ground circuit in the A/C Heater Control C2 harness connector.

    Is the resistance below 10k ohms? 

    Yes 

    1. Repair the (C21) Evaporator Temperature Sensor Signal circuit for a short to the (C121) Sensor Ground circuit.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Replace the A/C Heater Control in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
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