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TROUBLE DIAGNOSIS
ATC-75
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AT C
4.CHECK PBR REFERENCE VOLTAGE CIRCUIT BETWEEN AIR MIX DOOR (PASSENGER) AND
FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect the front air control connector.
3. Check continuity between air mix door motor (passenger) har-
ness connector M100 terminal 1 and front air control harness
connector M60 terminal 23.
OK or NG
OK >> Replace front air control. Refer toAT C - 11 6 , "REMOVAL"
.
NG >> Repair or replace harness as necessary.
5.CHECK PBR GROUND REFERENCE CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect the front air control connector.
3. Check continuity between air mix door motor (passenger) har-
ness connector M100 terminal 3 and front air control harness
connector M60 terminal 26.
OK or NG
OK >> GO TO 6.
NG >> Repair or replace harness as necessary.1 - 23 Continuity should exist.
MJIB0061E
3 - 26 Continuity should exist.
MJIB0062E
Page 410 of 3171
ATC-76
TROUBLE DIAGNOSIS
6.CHECK PBR FEEDBACK SIGNAL
1. Reconnect the front air control connector and air mix door motor
(passenger) connector.
2. Turn ignition switch ON.
3. Check voltage between front air control harness connector M61
terminal 36 and ground.
4. Rotate passenger temperature control dial through complete
range.
OK or NG
OK >> Replace front air control. Refer toAT C - 11 6 , "REMOVAL"
.
NG >> GO TO 7.
7.CHECK PBR FEEDBACK CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect the air mix door motor (passenger) connector and
front air control connector.
3. Check continuity between air mix door motor (passenger) har-
ness connector M100 terminal 2 and front air control harness
connector M61 terminal 36.
OK or NG
OK >> Replace air mix door motor (passenger). Refer toAT C -
131, "AIR MIX DOOR MOTOR (PASSENGER)".
NG >> Repair or replace harness as necessary.36 - Ground : Approx. 0 - 5V
WJIA1249E
2 - 36 : Continuity should exist.
MJIB0063E
Page 411 of 3171
TROUBLE DIAGNOSIS
ATC-77
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AT C
Intake Door Motor CircuitEJS006BM
SYMPTOM:
lIntake door does not change.
lIntake door motor does not operate normally.
INSPECTION FLOW
*1ATC-57, "Operational Check".*2ATC-55, "A/C System Self-diagno-
sis Function".*3ATC-56, "
SELF-DIAGNOSIS CODE
CHART".
MJIB0347E
Page 412 of 3171
ATC-78
TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
Component Parts
Intake door control system components are:
lFront air control
lIntake door motor
lIn-vehicle sensor
lAmbient sensor
lOptical sensor
lIntake sensor
System Operation
The intake door control determines the intake door position based on the position of the recirculation switch.
When the recirculation switch is depressed the intake door motor rotates closing off the fresh air inlet and
recirculating the cabin air. If the recirculation switch is depressed again, the intake door motor rotates in the
opposite direction, again allowing fresh air into the cabin.
In the AUTO mode, the front air control determines the intake door position based on the ambient tempera-
ture, the intake air temperature and the in-vehicle temperature. When the DEFROST, or OFF switches are
pushed or A/C switch is OFF, the front air control sets the intake door at the fresh position.
Intake Door Control Specification
WJIA0551E
WJIA0436E
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TROUBLE DIAGNOSIS
ATC-79
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COMPONENT DESCRIPTION
Intake door motor
The intake door motor is attached to the intake unit. It rotates so that
air is drawn from inlets set by the front air control. Motor rotation is
conveyed to a lever which activates the intake door.
NOTE:
This illustration is for LHD models. The layout for RHD models is
symmetrically opposite.
DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR
1.CHECK RESULT FROM FRONT AIR CONTROL SELF-DIAGNOSIS
Self-diagnosis code 82 is present. Refer toAT C - 5 5 , "
A/C System Self-diagnosis Function".
YES or NO
YES >> GO TO 2.
NO >> Replace front air control. Refer toAT C - 11 6 , "
REMOVAL".
2.CHECK POWER SUPPLY CIRCUIT FOR INTAKE DOOR MOTOR
1. Turn ignition switch OFF.
2. Disconnect front air control connector and intake door motor
connector.
3. Check continuity between front air control harness connector
M60 terminal 5 and intake door motor harness connector M86
terminal 6 and between front air control harness connector M60
terminal 4 and intake door motor harness connector M86 termi-
nal 1.
OK or NG
OK >> Replace intake door motor. Refer toATC-129, "INTAKE
DOOR MOTOR".
NG >> Repair or replace harness as necessary.
MJIB0165E
5 - 6 Continuity should exist.
4 - 1 Continuity should exist.
MJIB0208E
Page 414 of 3171
ATC-80
TROUBLE DIAGNOSIS
Blower Motor Circuit
EJS006BN
SYMPTOM:
lBlower motor operation is malfunctioning.
lBlower motor operation is malfunctioning under cold starting conditions.
INSPECTION FLOW
*1AT C - 5 7 , "Operational Check".*2ATC-55, "A/C System Self-diagnosis
Function".*3AT C - 5 6 , "
SELF-DIAGNOSIS CODE
CHART".
*4AT C - 8 2 , "
DIAGNOSTIC PROCE-
DURE FOR BLOWER MOTOR".
MJIB0331E
Page 415 of 3171

TROUBLE DIAGNOSIS
ATC-81
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SYSTEM DESCRIPTION
Component Parts
Blower speed control system components are:
lFront air control
lIn-vehicle sensor
lAmbient sensor
lOptical sensor
lIntake sensor
System Operation
Automatic Mode
In the automatic mode, the blower motor speed is calculated by the front air control and variable blower control
based on input from the in-vehicle sensor, optical sensor, intake sensor and ambient sensor, and potentio tem-
perature control (PTC).
When the air flow is increased, the blower motor speed is adjusted gradually. to prevent a sudden increase in
air flow.
In addition to manual air flow control and the usual automatic air flow control, starting air flow control, low
water temperature starting control and high passenger compartment temperature starting control are avail-
able.
Starting Blower Speed Control
Start up from cold soak condition (Automatic mode).
In a cold start up condition where the engine coolant temperature is below 50°C(122°F), the blower will not
operate at blower speed 1 for a short period of time (up to 210 seconds). The exact start delay time varies
depending on the ambient and engine coolant temperatures.
In the most extreme case (very low ambient temperature) the blower starting delay will be 210 seconds as
described above. After the coolant temperature reaches 50°C(122°F), or the 210 seconds has elapsed, the
blower speed will increase to the objective blower speed.
Start up from usual operating or hot soak condition (Automatic mode).
The blower will begin operation momentarily after the AUTO switch is pushed. The blower speed will gradually
rise to the objective speed over a time period of 3 seconds or less (actual time depends on the objective
blower speed).
WJIA1252E
Page 416 of 3171
ATC-82
TROUBLE DIAGNOSIS
Blower Speed Compensation - Sunload
When the in-vehicle temperature and the set temperature are very close, the blower will be operating at low
speed. The speed will vary depending on the sunload. During conditions of low or no sunload, the blower
operates at low speed. During high sunload conditions, the front air control causes the blower speed to
increase.
Blower Speed Control Specification
COMPONENT DESCRIPTION
Variable Blower Control
The variable blower control is located on the cooling unit. The vari-
able blower control receives a gate voltage from the front air control
to steplessly maintain the blower motor voltage in the 0 to 5 volt
range (approx.).
NOTE:
This illustration is for LHD models. The layout for RHD models is
symmetrically opposite.
DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR
SYMPTOM: Blower motor operation is malfunctioning under starting
blower speed control.
WJIA0441E
MJIB0166E
MJIB0064E