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MANUAL A/C DIAGNOSIS TSB Revision HEATER, AIR CONDITIONING AND VENTILATION 55A-227 STEP 2. Using scan tool MB991958, check data list item 04: CAUTION To prevent damage to scan tool MB991958, always turn the valve. (3) Turn ON the engine and then turn ON the air conditioner switch. (4) Set scan tool MB991958 to the data reading mode for item 04: A/C pressure sensor. • Check that the refrigerant pressure matches the dis- played value on the scan tool. (5) Turn the ignition switch to the "LOCK" (OFF) position. YES : Go to Step 7. AC305412 AB MB991910 DATA LINK CONNECTOR MB991824 MB991827 |