Page 3929 of 4555
TROUBLE DIAGNOSIS
MTC-5
C
D
E
F
G
H
I
K
L
MA
B
MTC
Discharge Air FlowEJS001HF
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Page 3930 of 4555
MTC-6
TROUBLE DIAGNOSIS
Wiring Diagram —HEATER—EJS001FD
TJWA0076E
Page 3931 of 4555

TROUBLE DIAGNOSIS
MTC-7
C
D
E
F
G
H
I
K
L
MA
B
MTC
Operational CheckEJS001FE
The purpose of the operational check is to confirm that the system operates properly.
CHECKING BLOWER
1. Turn fan switch to 1st-speed. Blower should operate on low
speed.
2. Then turn fan switch to 2nd-speed, and continue checking
blower speed until all speeds are checked.
3. Leave blower on Max. speed.
If NG, go to trouble diagnosis procedure for MTC-15, "
Blower Motor
Circuit" .
If OK, continue with the check.
CHECKING DISCHARGE AIR
1. Turn mode control dial to each position.
2. Confirm that discharge air comes out according to the air distri-
bution table. Refer to MTC-5, "
Discharge Air Flow" .
If NG, go to trouble diagnosis procedure for MTC-9, "
Mode Door" .
If OK, continue the check.
CHECKING RECIRCULATION
1. Press REC switch. Recirculation indicator should eliminate.
2. Press REC switch again. Recirculation indicator should not illu-
minate.
3. Listen for intake door position change (you should hear blower
sound change slightly).
If NG, go to trouble diagnosis procedure for MTC-11, "
Intake Door
Motor Circuit" .
If OK, continue the check.Conditions :Engine running at usual operating temperature
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Page 3932 of 4555
MTC-8
TROUBLE DIAGNOSIS
CHECKING TEMPERATURE DECREASE
1. Turn temperature control dial to full cold position.
2. Check for cold air at discharge air outlets.
If NG, go to trouble diagnosis procedure for MTC-10, "
Air Mix Door"
If OK, continue the check.
CHECKING TEMPERATURE INCREASE
1. Turn temperature control dial to full hot position.
2. Check for hot air at discharge air outlets.
If NG, go to trouble diagnosis procedure for MTC-19, "
Insufficient
Heating" .
If all operational check are OK (symptom cannot be duplicated), go
to Incident Simulation Tests in GI-23, "
How to Perform Efficient Diag-
nosis for an Electrical Incident" and perform tests as outlined to sim-
ulate driving conditions environment. If symptom appears, refer to
MTC-3, "
SYMPTOM TABLE" and perform applicable trouble diagno-
sis procedures.
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Page 3933 of 4555
TROUBLE DIAGNOSIS
MTC-9
C
D
E
F
G
H
I
K
L
MA
B
MTC
Mode DoorEJS001FF
SYMPTOM: Air outlet does not change.
INSPECTION FLOW
*1MTC-5, "Discharge Air Flow".*2MTC-7, "Operational Check".*3MTC-31, "MODE DOOR".
*4MTC-3, "
SYMPTOM TABLE".
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Page 3934 of 4555
MTC-10
TROUBLE DIAGNOSIS
Air Mix DoorEJS001FG
SYMPTOM: Air mix door does not change.
INSPECTION FLOW
*1MTC-32, "AIR MIX DOOR".*2MTC-3, "SYMPTOM TABLE".*3MTC-7, "Operational Check".
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Page 3935 of 4555
TROUBLE DIAGNOSIS
MTC-11
C
D
E
F
G
H
I
K
L
MA
B
MTC
Intake Door Motor CircuitEJS004HC
SYMPTOM:
Intake door does not change.
Intake door motor does not operate normally.
INSPECTION FLOW
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 heater control panel. Motor rotation
is conveyed to a lever which activates the intake door.
*1MTC-11, "Intake Door Motor Circuit".*2MTC-7, "Operational Check".*3MTC-3, "SYMPTOM TABLE".
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Page 3936 of 4555

MTC-12
TROUBLE DIAGNOSIS
DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR
SYMPTOM: Intake door does not operate normally.
1. CHECK POWER SUPPLY FOR HEATER CONTROL PANEL
1. Disconnect heater control panel connector.
2. Turn ignition switch ON.
3. Check voltage between heater control panel harness connector
M55 terminal 1 (BR/Y) and ground.
OK or NG
OK >> GO TO 2.
NG >> Check power supply circuit and 10 A fuse [No. 15,
located in the fuse block (J/B)]. Refer to PG-79, "
FUSE
BLOCK - JUNCTION BOX (J/B)" .
If OK, check harness for open circuit. Repair or replace if necessary.
If NG, replace fuse and check harness for short circuit. Repair or replace if necessary.
2. CHECK GROUND CIRCUIT FOR HEATER CONTROL PANEL
1. Turn ignition switch OFF.
2. Check continuity between heater control panel harness connec-
tor M55 terminal 5 (B) and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
3. CHECK RECIRCULATION SWITCH CIRCUIT
1. Press REC (recirculation) switch.
2. Check continuity between heater control panel harness connec-
tor M55 terminal 1 (BR/Y) and 5 (B).
OK or NG
OK >> GO TO 4.
NG >> Replace heater control panel.
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1 – Ground : Battery voltage
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5 – Ground : Continuity should exist.
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1 (−) – 5 (+) : Continuity should exist.
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