Diagnostic Test

WARNING: This page is about a different car, the 2009 Dodge Caliber. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR DTC B1031-EVAPORATOR FIN TEMPERATURE SENSOR CIRCUIT LOW WITH EVAPORATOR TEMPERATURE SENSOR HARNESS CONNECTOR DISCONNECTED
1. Turn the ignition off.
2. Disconnect the Evaporator Temperature Sensor harness connector.
3. Turn the ignition on.
4. With the scan tool, erase DTCs.
5. Turn the ignition off, wait 10 seconds, and turn the ignition on.
6. With the scan tool, read DTCs.
  Does the scan tool display: B1031-EVAPORATOR FIN TEMPERATURE SENSOR CIRCUIT LOW?
  
  Yes
  - Go To 2
  No
  - Replace the Evaporator Temperature Sensor in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
CHECK (C21) EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

Fig 1: Checking Evaporator Temperature Sensor Signal Circuit For A Short To Ground
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Cluster (CCN) C3 harness connector.
3. Measure the resistance of the (C21) Evaporator Temperature Sensor Signal circuit between ground and the Cluster (CCN) C3 harness connector.
  Does the ohm meter read open circuit?
  
  Yes
  - Go To step 3
  No
  - Repair the (C21) Evaporator Temperature Sensor Signal circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
CHECK (C21) EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO (C121) SENSOR GROUND CIRCUIT

Fig 2: Checking Evaporator Temperature Sensor Signal Circuit For A Short To Sensor Ground Circuit
Courtesy of CHRYSLER LLC
1. Disconnect the Cluster (CCN) C4 harness connector.
2. Measure the resistance between the (C21) Evaporator Temperature Sensor Signal circuit in the Cluster (CCN) C4 harness connector and the (C121) Sensor Ground circuit in the Cluster (CCN) C3 harness connector.
  Does the ohm meter read open circuit?
  
  Yes
  - Replace the Cluster (CCN) in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
  No
  - Repair the (C21) Evaporator Temperature Sensor Signal circuit for a short to the (C121) Sensor Ground circuit.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .