Diagnostic Test

CHECK IF DTC IS ACTIVE
1. Ignition on, engine not running.
2. With the scan tool, read HVAC DTCs.
  Is this DTC active?
  
  Yes
  - Go To 2
  No
  - Go To 7
CHECK IF THE IN-CAR TEMPERATURE SENSOR IS PROPERLY CONNECTED
1. Turn the ignition off to the lock position.
2. Check the connector to the In-Car Temperature Sensor for proper connection and the terminals for damage or corrosion.
  Is the In-Car Temperature Sensor connector properly connected and terminals undamaged or corroded?
  
  Yes
  - Go To 3
  No
  - Repair connector and terminals as necessary.
  - Perform the HVAC VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (C36) IN-CAR TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

Fig 1: Checking In-Car Temperature Sensor Signal Circuit For A Short To Voltage
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off to the lock position.
2. Disconnect the A/C Heater Control C1 harness connector.
3. Disconnect the In-Car Temperature Sensor harness connector.
4. Ignition on, engine not running.
5. Measure the voltage of the (C36) In-Car Temperature Sensor Signal circuit.
  Is there any voltage present?
  
  Yes
  - Repair the In-Car Temperature Sensor Signal circuit for a short to voltage.
  - Perform the HVAC VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 4
CHECK THE (C36) IN-CAR TEMPERATURE SENSOR SIGNAL CIRCUIT FOR AN OPEN

Fig 2: Checking In-Car Temperature Sensor Signal Circuit For An Open
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off to the lock position.
2. Measure the resistance of the (C36) In-Car Temperature Sensor Signal circuit between the A/C Heater Control C1 harness connector and the In-Car Temperature Sensor harness connector.
  Is the resistance above 1.0 Ohm?
  
  Yes
  - Repair the In-Car Temperature Sensor Signal circuit for an open.
  - Perform the HVAC VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 5
CHECK THE (C121) SENSOR GROUND CIRCUIT FOR AN OPEN

Fig 3: Checking Sensor Ground Circuit For An Open
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance of the (C121) Sensor Ground circuit between the A/C Heater Control C1 harness connector and the In-Car Temperature Sensor harness connector.
  Is the resistance above 1.0 Ohm?
  
  Yes
  - Repair the (C121) Sensor Ground circuit for an open.
  - Perform the HVAC VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 6
CHECK THE IN-CAR TEMPERATURE SENSOR

Fig 4: Checking The In-Car Temperature Sensor
Courtesy of CHRYSLER GROUP, LLC
1. Remove the In-Car Temperature Sensor. Refer to SENSOR, TEMPERATURE, IN-CAR, REMOVAL .
2. Measure the resistance of the In-Car Temperature Sensor and compare the resistance to the In-Car Temperature Sensor Resistance Chart in the Service Information. Refer to SENSOR, TEMPERATURE, IN-CAR, DIAGNOSIS AND TESTING .
  Is the In-Car Temperature Sensor within the specified limits of In-Car Temperature Sensor Resistance Chart?
  
  Yes
  - Replace and program the A/C Heater Control in accordance with the Service Information. Refer to CONTROL, A/C AND HEATER, REMOVAL .
  - Perform the HVAC VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Replace the In-Car Temperature Sensor in accordance to the Service Information. Refer to SENSOR, TEMPERATURE, IN-CAR, INSTALLATION .
  - Perform the HVAC VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE WIRING AND CONNECTORS
1. The conditions necessary to set the DTC are not present at this time.
2. With the scan tool, check the Environmental Data to help identify the conditions in which the DTC was set.
3. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
4. Wiggle the wiring and connectors while checking for shorted and open circuits.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the HVAC VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Test complete.