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MANUAL A/C DIAGNOSIS TSB Revision HEATER, AIR CONDITIONING AND VENTILATION 55A-99 STEP 1. Using scan tool MB991958, diagnose the CAN bus CAUTION To prevent damage to scan tool (MUT-III), always turn the 1. Connect scan tool MB991958 to the data link connector. Q: Is the CAN bus line found to be normal? YES : Go to Step 2. precautions on how to repair the can bus lines STEP 2. Recheck for diagnostic trouble code. Check again if the DTC is set. 1. Connect scan tool MB991958 to the data link connector Q: Is the check result satisfactory? YES : There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to .) NO : Replace the A/C-ECU. On completion, check that the DTC is not reset. AC305412 AB MB991910 DATA LINK CONNECTOR MB991824 MB991827 AC305412 AB MB991910 DATA LINK CONNECTOR MB991824 MB991827 |