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AUTO A/C DIAGNOSIS HEATER, AIR CONDITIONING AND VENTILATION 55-88 STEP 21. Check the A/C pressure sensor operation. valve. (2) Disconnect the A/C pressure sensor connector and connect special tool test harness MB991658 as shown in the (3) Turn ON the engine and then turn ON the air conditioner switch. (4) At this time, check to see that the voltage of A/C pressure sensor terminal No. 2 reflects the specifications of the NOTE: The allowance shall be defined as ±5%. Q: Is the A/C pressure sensor operating properly? YES : Go to Step 22. conditioning works normally. STEP 22. Check the refrigerant level. Q: Is the refrigerant level correct? YES : Go to Step 23. Service ). Check that the air conditioning works normally. STEP 23. Replace the A/C-ECU. Q: Does the A/C operate normally? YES : The procedure is complete. the air conditioning works normally. AC305034 A/C PRESSURE SENSOR AD AC307368 A/C MB991658 AB HARNESS SIDE AC208297AB REFRIGERANT PRESSURE (MPa) OUTPUT VOLTAGE (V) 0 1 2 3 5 1 2 3 |