MTC Air Conditioner - How to Perform Trouble Diagnosis for Quick and Accurate Repair

TROUBLE DIAGNOSIS
MTC-33
C
D
E
F
G
H
I
K
L
M
A
B
MTC
Revision: January 2005 2004 Quest
How to Perform Trouble Diagnosis for Quick and Accurate Repair EJS001SA
WORK FLOW
SYMPTOM TABLE
*1 MTC-52, "Operational Check"
SHA900E
Symptom Reference Page
A/C system does not come on. Go to Trouble Diagnosis Procedure for A/C System.
MTC-54, "
Power
Supply and
Ground Circuit for
Front Air Control"
A/C system display is malfunctioning. Go to "Navigation System", or "Integrated Display System".
AV-118, "
NAVIGA-
TION SYSTEM"
(With Navi.) AV-
89, "INTE-
GRATED DIS-
PLAY SYSTEM"
(Without Navi.)
A/C system cannot be controlled. Go to Self-diagnosis Function.
MTC-50, "
A/C
System Self-diag-
nosis Function"
Air outlet does not change.
Go to Trouble Diagnosis Procedure for Mode Door Motor.
MTC-57, "Mode
Door Motor Cir-
cuit"
Mode door motor is malfunctioning.
Discharge air temperature does not change.
Go to Trouble Diagnosis Procedure for Air Mix Door Motor.
MTC-61, "
Air Mix
Door Motor Cir-
cuit"
Air mix door motor is malfunctioning.
Intake door does not change.
Go to Trouble Diagnosis Procedure for Intake Door Motor.
MTC-67, "
Intake
Door Motor Cir-
cuit"
Intake door motor is malfunctioning.
Defroster door motor is malfunctioning. Go to Trouble Diagnosis Procedure for Defroster Door Motor.
MTC-70,
"Defroster Door
Motor Circuit"
Front blower motor operation is malfunction-
ing.
Go to Trouble Diagnosis Procedure for Front Blower Motor.
MTC-72, "
Front
Blower Motor Cir-
cuit"
Rear blower motor operation is malfunction-
ing.
Go to Trouble Diagnosis Procedure for Rear Blower Motor.
MTC-80, "
Rear
Blower Motor Cir-
cuit"
Rear discharge air temperature and/or air
outlet does not change.
Go to Trouble Diagnosis Procedure for Rear Air Control circuit.
MTC-91, "Rear Air
Control Circuit"
Magnet clutch does not engage. Go to Trouble Diagnosis Procedure for Magnet Clutch.
MTC-94, "
Magnet
Clutch Circuit"
Insufficient cooling Go to Trouble Diagnosis Procedure for Insufficient Cooling.
MTC-100, "
Insuffi-
cient Cooling"
Insufficient heating Go to Trouble Diagnosis Procedure for Insufficient Heating.
MTC-108, "
Insuffi-
cient Heating"