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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heater Systems >> Trouble Shooting >> Diagnostic System Check

Diagnostic System Check

  1. Did you review DIAGNOSTIC STARTING POINT ? If so, go to next step. If not, go to DIAGNOSTIC STARTING POINT .
  2. Install a scan tool. Does the scan tool power up? If so, go to next step. If not, see appropriate SELF DIAGNOSIS article in ENGINE PERFORMANCE.
  3. Turn the ignition on, with the engine off. Attempt to establish communication with the PCM. Does the scan tool communicate with the PCM? If so, go to next step. If not, see appropriate SELF DIAGNOSIS article in ENGINE PERFORMANCE.
  4. Select the PCM display DTCs function on the scan tool. Does the scan tool display any DTCs? If so, go to next step. If not, see SYMPTOM DIAGNOSIS .
  5. Does the scan tool display any DTCs which begin with a "U"? If so, see appropriate SELF DIAGNOSIS article in ENGINE PERFORMANCE. If not, go to next step.
  6. Does the scan tool display DTC P0530? If so, see DIAGNOSTIC TESTS under MANUAL A/C-HEATER SYSTEMS article. If the scan tool display any other DTCs, see appropriate SELF DIAGNOSIS article in ENGINE PERFORMANCE.
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