TROUBLESHOOTING
Contents
1. 2002 ECHO RM884U Author Date 1461 AC 15 AIR CONDITIONING TROUBLESHOOTING Symptom Suspect Area See page ECU IG Fuse RDI Fuse Fan No 1 relay Water temperature switch Fan motor A C amplifier Engine and ECT ECU Wire harness No condenser fan operation ONOOR WD Fan No 2 relay Pressure switch No condenser fan speed change Condenser fan resistor A C amplifier Wire harness Two way flow heater GAUGE Fuse HTR Fuse Heater main relay No blower operation Blower motor Blower resistor Blower speed control switch Wire harness ECU IG Fuse Air inlet servomotor No air inlet control Heater switch Heater control assembly PTC amplifier Wire harness A C Fuse Micro switch for MAX WARM Micro switch for FOOT FOOT DEF Heater switch Heater control assembly PTC amplifier Air inlet servomotor Wire harness Air inlet door does not operate on the two way flow position when perform in these conditions e Air inlet selector FRESH e Blower switch ON e Temperature control selector MAX WARM e Mode selector FOOT or FOOT DEF PTC heater Symptom Suspect Area See page A C Fuse Micro switch for MAX WARM Micro switch for FOOT FOOT DEF Heater switch Heater control assembly PTC heater Heater radiator PTC amplifier Air inlet servomotor Wire harness PTC heater does not operate when perfo2. AC 14 AIR CONDITIONING _ _ TROUBLESHOOTING TROUBLESHOOTING PROBLEM SYMPTOMS TABLE Use the table below to help you find the cause of the problem The numbers indicate the priority of the likely cause of the problem Check each part in order If necessary replace these parts Standard 4 HTR Fuse 5 Heater main relay 6 Blower motor 7 Blower resistor 8 Blower speed control switch 9 Wire harness Noait i fral 1 Engine coolant volume o air temperature contro P 2 Heater control assembly AC 78 1 Refrigerant volume 2 A C Fuse 3 Magnetic clutch relay 4 Magnetic clutch 5 Compressor 6 Pressure switch 7 A C switch 8 A C amplifier 9 Thermistor 10 Wire harness AC27Y 03 No blower operation No compressor operation Refrigerant volume Refrigerant pressure Drive belt Magnetic clutch Compressor Pressure switch Thermistor A C switch 9 A C amplifier 10 Heater control assembly 11 Wire harness No cool air comes out 2 3 4 5 6 7 8 Refrigerant volume Drive belt Magnetic clutch Compressor Condenser Expansion valve Evaporator Refrigerant lines Pressure switch 10 A C amplifier 11 Heater control assembly A C amplifier AC 75 No engine idle up when A C switch ON Engine and ECT ECU 3 Wire harness No air inlet control Heater control assembly AC 78 No mode control Heater control assembly AC 78 Insufficient cooling OAN DA RWDY
3. rm in these conditions e Engine coolant temp 60 C 140 F or below e Engine speed 650 rpm or above e Temperature control selector MAX COOL 2 3 4 5 6 7 8 2002 ECHO RM884U Author Date 1462
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