MTC Air Conditioner - Power Supply and Ground Circuit for Front Air Control; Inspection Flow

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MTC-54

TROUBLE DIAGNOSIS

Revision: January 2005 2004 Quest

Power Supply and Ground Circuit for Front Air Control EJS001SH

SYMPTOM: A/C system does not come on.

INSPECTION FLOW

*1 MTC-54, "Power Supply and Ground

Circuit for Front Air Control"

*2 MTC-52, "Operational Check".

WJIA1027E

Main Page

Default Chapter1
- Table of Contents1
Precautions5
- Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER5
- Precautions for Working with HFC-134A (R-134A)5
- Contaminated Refrigerant5
- General Refrigerant Precautions6
- Precautions for Leak Detection Dye6
- A/C Identification Label7
- Precautions for Refrigerant Connection7
  - Features of New Type Refrigerant Connection7
  - O-Ring and Refrigerant Connection8
- Precautions for Servicing Compressor11
- Precautions for Service Equipment11
- Wiring Diagrams and Trouble Diagnosis13
Preparation14
- Special Service Tools14
- HFC-134A (R-134A) Service Tools and Equipment14
- Commercial Service Tools16
Refrigeration System18
- Refrigerant Cycle18
  - Refrigerant Flow18
- Refrigerant System Protection18
  - Refrigerant Pressure Sensor18
  - Pressure Relief Valve19
- Component Layout20
  - Front Refrigeration System20
  - Rear Refrigeration System21
Lubricant22
- Maintenance of Lubricant Quantity in Compressor22
  - Checking and Adjusting22
Air Conditioner Control24
- Description24
- Operation24
- Description of Control System26
- Control Operation26
- Discharge Air Flow28
  - Front28
  - Rear28
- System Description29
  - Switches and Their Control Function29
- CAN Communication System Description30
Trouble Diagnosis31
- CONSULT-II Function (BCM)31
  - Consult-II Basic Operation31
  - Data Monitor32
- How to Perform Trouble Diagnosis for Quick and Accurate Repair33
- Work Flow33
- Symptom Table33
- Component Parts and Harness Connector Location35
- Schematic38
- Wiring Diagram -A/C,M39
- Front Air Control Terminals and Reference Value48
  - Pin Connector Terminal Layout48
  - Terminals and Reference Value for Front Air Control48
- A/C System Self-Diagnosis Function50
  - Description50
- Operational Check52
- Power Supply and Ground Circuit for Front Air Control54
- Mode Door Motor Circuit57
- Air MIX Door Motor Circuit61
- Intake Door Motor Circuit67
- Defroster Door Motor Circuit70
- Front Blower Motor Circuit72
Control Unit116
- Removal and Installation116
  - Front Air Control116
  - Rear Air Control116
Ambient Sensor117
- Removal and Installation117
Intake Sensor118
- Removal and Installation118
  - Removal118
  - Installation118
Blower Motor119
- Removal and Installation119
  - Front Blower Motor119
  - Rear Blower Motor120
In-Cabin Microfilter121
- Removal and Installation121
Heater & Cooling Unit Assembly122
- Components122
- Removal and Installation123
  - Front Heater and Cooling Unit Assembly123
  - Rear Heater and Cooling Unit Assembly124
Heater Core125
- Components125
- Removal and Installation126
  - Front Heater Core126
  - Rear Heater Core127
Heater Pump128
- Removal and Installation128
  - Removal128
  - Installation128
Defroster Door Motor129
- Removal and Installation129
  - Removal129
  - Installation129
Intake Door Motor130
- Components130
- Removal and Installation131
  - Driver Side131
  - Passenger Side132
Mode Door Motor133
- Removal and Installation133
  - Removal133
  - Installation134
Air MIX Door Motor135
- Components135
- Removal and Installation135
  - Air MIX Door Motor (Front)135
  - Air MIX Door Motor (Rear)136
Front Blower Motor Resistor137
- Removal and Installation137
  - Removal137
  - Installation137
Rear Blower Motor Resistor138
- Removal and Installation138
  - Removal138
  - Installation138
Ducts and Grilles139
- Components139
- Removal and Installation142
Refrigerant Lines144
- HFC-134A (R-134A) Service Procedure144
  - Setting of Service Tools and Equipment144
- Components146
- Removal and Installation for Compressor148
  - Removal148
  - Installation148
- Removal and Installation for Compressor Clutch149
- Removal and Installation for Low-Pressure Flexible Hose152
  - Removal152
  - Installation152
- Removal and Installation for High-Pressure Flexible Hose152
- Removal and Installation for High-Pressure Pipe153
  - Removal153
  - Installation153
- Removal and Installation for High/Low-Pressure Pipe153
- Removal and Installation for Refrigerant Pressure Sensor153
- Removal and Installation for Condenser154
  - Removal154
  - Installation154
- Removal and Installation for Front Evaporator155
  - Removal155
  - Installation156
- Removal and Installation for Rear Evaporator157
  - Removal157
  - Installation158
- Removal and Installation for Front Expansion Valve158
  - Removal158
- Removal and Installation for Rear Expansion Valve158
- Checking for Refrigerant Leaks159
- Checking System for Leaks Using the Fluorescent Dye Leak Detector159
- Dye Injection159
- Electronic Refrigerant Leak Detector160
Service Data and Specifications (Sds)163
- Compressor163
- Lubricant163
- Refrigerant163
- Engine Idling Speed163
- Belt Tension163

MTC Air Conditioner - Power Supply and Ground Circuit for Front Air Control; Inspection Flow

Table of Contents