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Manual System

  1. Connect scan tool. If scan tool powers up, go to next step. If scan tool does not power up, go to TEST A: SCAN TOOL DOES NOT POWER UP  under SYSTEMS TESTS.
  2. Turn ignition on, engine off. Attempt to establish communications with Powertrain Control Module (PCM). If scan tool communicates with PCM, go to next step. If scan tool does not communicate with PCM, go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
  3. Using scan tool, select DISPLAY DTCs function for PCM. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair air conditioning system by symptom. See appropriate MANUAL A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.
  4. If scan tool does not display DTCs beginning with "U", go to next step. If scan tool displays any DTCs beginning with "U", go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
  5. If scan tool displays any DTCs beginning with "P", perform appropriate test in accordance with DTC retrieved. See appropriate MANUAL A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING. If scan tool does not display any DTCs beginning with "P", repair air conditioning system by symptom. See appropriate MANUAL A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.
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