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Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
HVAC SYSTEM TEST - DIAGNOSTIC PROCEDURE

TEST ACTION
1 Turn the ignition on.
With the DRBIII(R), attempt to communicate with the Powertrain Control Module (PCM).
With the DRBIII(R), attempt to communicate with the Central Timer Module (CTM).
Was the DRBIII(R) able to communicate with the PCM and the CTM?
  1. Yes --> Go To 2
  2. No --> Refer to the COMMUNICATION  category and perform the appropriate symptom.

    Perform BODY VERIFICATION TEST - VER 1  .
2 With the DRBIII(R), read Powertrain Computer DTCs.
Are any HVAC related DTCs present?
  1. Yes --> Refer to POWERTRAIN DIAGNOSTIC PROCEDURES for the related symptom(s).

    Perform BODY VERIFICATION TEST - VER 1  .

  2. No --> Go To 3
3 With the DRBIII(R), read Central Timer Module (CTM) DTCs.
Are any DTCs present?
  1. Yes --> Refer to the appropriate category for the related symptom(s).

    Perform BODY VERIFICATION TEST - VER 1  .

  2. No --> Go To 4
4
CAUTION: The evaporator temperature must be above 18.3°C (65°F) and the work area ambient temperature must be above 21.1°C (70°F) to test A/C system operation.
NOTE: Active DTCs must be resolved before diagnosing stored DTCs.
NOTE: Anytime a DTC becomes active, or a Cooldown Test fault message, Actuator Circuit Test fault message, or Door Recalibration fault message is displayed, proceed directly to the conclusion question.
Start the engine.Turn the mode select control to the panel position.Verify that the blower motor operates correctly in all speeds. Diagnose and repair all blower motor related faults before proceeding with this test.For vehicles equipped with A/C, turn the blower control to the high speed position.
NOTE: Before actuating the AC Cooldown Test, verify that the A/C compressor is not running. If the compressor is running, turn the A/C off and allow the evaporator to warm up before proceeding with the test.
With the DRBIII(R) in HVAC, System Tests, actuate the AC Cooldown Test (vehicles with A/C only). Allow one minute for test to complete.Turn the blower control to the low speed position.Turn the blend control to the full cold position.Monitor the DRBIII(R) for active HVAC DTCs while performing the following test steps.If equipped, press the A/C on/off switch on, wait 30 seconds, and then press it off.If equipped, press the EBL switch on, wait 30 seconds, and then press it off. Slowly turn the blend control from full cold to full hot, wait 30 seconds, and then turn it back to full cold.Turn the mode select control to every door position. Leave it in each position for approximately 30 seconds.With the DRBIII(R) in HVAC, System Tests, actuate the Actuator Circuit Test.With the DRBIII(R) in HVAC, System Tests, actuate the HVAC Door Recalibration Test.Does the DRBIII(R) display any HVAC DTCs or System Test fault messages?
  1. Yes --> Return to the symptom list and choose the symptom(s).

    Perform BODY VERIFICATION TEST - VER 1  .

  2. No --> Go To 5
5 With the DRBIII(R), read PCM DTCs.
Are any HVAC related DTCs present?
  1. Yes --> Refer to POWERTRAIN DIAGNOSTIC PROCEDURES for the related symptom(s).

    Perform BODY VERIFICATION TEST - VER 1  .

  2. No --> Recheck the climate control system performance.

    Perform BODY VERIFICATION TEST - VER 1  .
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