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MANUAL A/C DIAGNOSIS TSB Revision HEATER, AIR CONDITIONING AND VENTILATION 55A-123 . TECHNICAL DESCRIPTION (COMMENT) . TROUBLESHOOTING HINTS • Improper amount of refrigerant • Malfunction of the air thermo sensor • Malfunction of the ambient air temperature sen- sor • Malfunction of the A/C pressure sensor • Malfunction of the A/C compressor clutch relay • Malfunction of the A/C refrigerant temperature switch • Malfunction of the air conditioning compressor clutch • Malfunction of the A/C-ECU • Malfunction of the PCM • Damaged harness wires or connectors DIAGNOSIS Required Special Tools: • MB991223: Harness Set • MB991958: Scan Tool (MUT-III Sub Assembly) • MB991824: Vehicle Communication Interface (V.C.I.) • MB991827: MUT-III USB Cable • MB991910: MUT-III Main Harness A (Vehicles with CAN communication system) STEP 1. Check the defogger and outside/inside air control motor work normally? A/C-ECU power supply system STEP 2. Check the blower motor operation. YES : Go to Step 3. and motor do not turn STEP 3. Check the A/C compressor. Check the A/C compressor for compressor oil leaks. YES : Replace the A/C compressor or the expansion valve. AC305415 CONNECTORS: C-214, C-215 JUNCTION BLOCK C-215 C-214 BB |