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TROUBLE DIAGNOSIS ATC-95 C D E F G H I K L M A B ATC Low-pressure Side Sometimes Becomes Negative Low-pressure Side Becomes Negative DIAGNOSIS PROCEDURE FOR INSUFFICIENT COOLING SYMPTOM: Insufficient cooling 1. CHECK POWER SUPPLY FOR ECV (ELECTRONIC CONTROL VALVE) 1. Disconnect compressor (ECV) connector. 2. Turn ignition switch ON. 3. Check voltage between compressor (ECV) harness connector OK or NG OK >> GO TO 2. NG >> Check power supply circuit and 10A fuse [No. 12 located in the fuse block (J/B)]. Refer to ● If fuse is OK, check harness for open circuit. Repair or replace if necessary. ● If fuse is NG, check harness for short circuit and replace fuse. Gauge indication Refrigerant cycle Probable cause Corrective action Low-pressure side sometimes ● Air conditioning system ● The system constantly func- Refrigerant does not dis- ↓ Moisture is frozen at expan- ↓ Water is mixed with refriger- ● Drain water from refrigerant ● Replace liquid tank. AC354A Gauge indication Refrigerant cycle Probable cause Corrective action Low-pressure side becomes nega- Liquid tank or front/rear side of High-pressure side is closed ↓ Expansion valve or liquid tank Leave the system at rest until ● If water is the cause, initially ● If due to foreign particles, ● If either of the above meth- ● Replace liquid tank. ● Check lubricant for contami- AC362A 3 – Ground : Battery voltage RJIA1553E |