Serial
Number
Content
Possible Reasons
4
Heater temperature sensor circuit open or short to
power supply or ground
1. Heater Temperature Sensor Malfunction
2. Heater temperature sensor is not installed correctly
3. Harness Malfunction
4. Control Module Malfunction
5
Ambient and sun light sensor circuit open or short to
power supply or ground
1. Ambient and Sun Light Sensor Malfunction
2. Harness Malfunction
3. Control Module Malfunction
6
Temperature control motor circuit open or short to
power supply or ground
1. Temperature Control Motor Malfunction
2. Throttle Control System Malfunction
3. Harness Malfunction
4. Control Module Malfunction
7
Mode motor circuit open or short to power supply or
ground
1. Mode Motor Malfunction
2. Throttle Control System Malfunction
3. Harness Malfunction
4. Control Module Malfunction
8
Inside and outside circulation motor locked or other
obstruction
1. Inside and Outside Circulation Motor Malfunction
2. Inside and Outside Circulation Air Duct Malfunction
3. Harness Malfunction
4. Control Module Malfunction
9
Blower circuit open or short to power supply or ground,
or speed adjust module abnormal
1. Blower Speed Control Module Malfunction
2. Blower Malfunction
3. Harness Malfunction
4. Control Module Malfunction
10
System voltage is too high or too low
1. Generator Malfunction
2. Control Module Malfunction
8.2.7.6 Air-conditioning Clutch Inoperative
Schematic:
Air-conditioning System Circuit Schematic
Diagnostic Steps:
Step 1
Check the air-conditioning system related DTC code.
(a)
Connect scan tool, read air-conditioning system related to
DTC codes.
8-24
Automatic Air-conditioning
Heating, Ventilation and A/C System
EC718/EC718RV EC715/EC715RV 10/2009
Summary of Contents for EC715 2009
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