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Testing Preparation & Diagnostics

WARNING: This page is about a different car, the 2006 Dodge Sprinter. However, it is still accessible from the selected car via links, so may be relevant.

Set the necessary system functions accordingly so that all of the following prerequisites are met prior to performing diagnostic tests on the ATC system:

  1. Connect the DRBIII® to the DLC.
  2. Place the shift lever in park.
  3. Start the engine.
  4. Set the blower to high speed.
  5. Set the temperature selector to full cold.
  6. Press air conditioning switch on.
  7. With the DRBIII® in Sensors, verify that the:
    1. ambient temperature is above 59°F (15°C).
    2. refrigerant pressure is between 29 and 348 PSI (2 and 24 bar).
    3. evaporator temperature is above 36.5°F (2.5°C).
    4. coolant temperature is above 158°F (70°C).

When all of the prerequisites have been met, use the DRBIII® to record and erase all stored ATC DTCs, and then select System Tests, and run the ATC Function Test. When complete, check to see if any active DTCs are present. If so, refer to the symptom list in the HEATING & A/C  category for the diagnostic procedure(s). If there are no DTCs present, yet the performance seems less than ideal, use the DRBIII® to look at all sensor values and the status of the various inputs and outputs to see if there is a deficiency detected that has not fully shut down the system. For additional information, refer to SENSOR VALUES  and INPUT/OUTPUT STATUS  under Diagnostic Tips and to CHARTS AND GRAPHS  for evaporator temperature sensor and air outlet temperature sensor resistance to temperature specifications charts. Also, confirm that the water cycle valve is functioning. Remember that the valve is normally open. The pulse width signal will offer insight into the valve's operation. The lower the percentage number, the more open the valve becomes. Confirm that the valve is responding to the signal from the ATC. If functioning correctly, verify mode and blend door operation. If okay, the diagnosis then becomes purely refrigerant system related. Attach the appropriate gauges and diagnose the refrigeration system. Refer to the appropriate Service Information for refrigerant system diagnostic procedures.

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