Page 617 of 3066
TROUBLE DIAGNOSIS
ATC-39
C
D
E
F
G
H
I
K
L
MA
B
AT C
TJWA0007E
Page 618 of 3066
ATC-40
TROUBLE DIAGNOSIS
TJWA0008E
Page 619 of 3066
TROUBLE DIAGNOSIS
ATC-41
C
D
E
F
G
H
I
K
L
MA
B
AT C
Auto Amp. Terminals and Reference ValueEJS001GW
Measure voltage between each terminal and body ground by follow-
ing AUTO AMP. INSPECTION TABLE.
PIN CONNECTOR TERMINAL LAYOUT
AUTO AMP. INSPECTION TABLE
RJIA0488E
RJIA0489E
TERMI-
NAL NO.ITEM CONDITIONVo l ta g e
(V)
1 Power supply for IGNIGN
ON- Approx. 12
2 Power supply for BATIGN
OFF- Approx. 12
3 GroundIGN
ONApprox. 0
4 Compressor ON signalIGN
ONCompressor: ON Approx. 0
Compressor: OFF Approx. 4.8
5Power supply for mode
door motor, air mix door
motor, intake door motorIGN
ON- Approx. 12
8 In-vehicle sensor - - -
9 Ambient sensor - - -
10 Sunload sensor - - -
11 Illumination groundIGN
ONLight switch: ON Approx. 0
12Power supply for illumina-
tionIGN
ONLight switch: ON Approx. 12
15 LAN signalIGN
ON-Approx. 0
HAK0652D
Page 620 of 3066

ATC-42
TROUBLE DIAGNOSIS
Self-diagnosis Function
EJS001GX
DESCRIPTION
The self-diagnostic system diagnoses sensors, door motors, blower motor, etc. by system line. Refer to appli-
cable sections (items) for details. Shifting from normal control to the self-diagnostic system is accomplished
by starting the engine (turning the ignition switch from OFF to ON) and pressing OFF switch for at least 5
seconds. The "OFF" switch must be pressed within 10 seconds after starting the engine (ignition switch is
turned ON). This system will be canceled by either pressing A/C switch or turning the ignition switch OFF.
Shifting from one step to another is accomplished by means of turning temperature dial, as required.
17Fan control amp. control
signalIGN
ONFan speed: 1st, 2nd, 3rd, 4th Approx. 2.5 - 3.5
Fan speed: 5th Approx. 9.0
18 Blower motor feed backIGN
ONFan speed: 1st Approx. 8.0
19 Fan ON signalIGN
ONBlower fan: ON Approx. 0
Blower fan: OFF Approx. 4.8
20 Power supply for ACCIGN
ON-Approx.12
21With gasoline engine:
Water temperature sensorIGN
ON-
With diesel engine:
Thermal transmitterIGN
ONWater temperature: 56°C Approx. 5.67 - 7.01
24 Sensor groundIGN
ON-Approx.0
25 Intake sensor - - -
30Compressor feed back sig-
nal (With gasoline engine)IGN
ON-Approx.0
Disconnect the refrigerant pressure sensor
connectorApprox. 5 TERMI-
NAL NO.ITEM CONDITIONVo ltag e
(V)
SKIA0056J
Page 621 of 3066
TROUBLE DIAGNOSIS
ATC-43
C
D
E
F
G
H
I
K
L
MA
B
AT C
Additionally shifting from STEP 5 to AUXILIARY MECHANISM is accomplished by means of pushing (fan)
UP switch.
PROCEDURE
1.SET IN SELF-DIAGNOSTIC MODE
1. Turn ignition switch ON.
2. Set in self-diagnostic mode as follows. Within 10 seconds after starting engine (ignition switch is turned
ON.), press OFF switch for at least 5 seconds.
>> GO TO 2.
RJIA0490E
Page 622 of 3066
ATC-44
TROUBLE DIAGNOSIS
2.STEP 1 - LEDS AND DISPLAY ARE CHECKED
Check LEDs illuminate and display screen.
Ye s o r N o
Yes >>GOTO3.
No >> Malfunctioning OFF switch or LEDs.
>> Replace A/C auto amp.
3.CHECK TO ADVANCE SELF-DIAGNOSIS STEP 2
1. Turn the temperature dial clockwise.
2. Advance to self-diagnosis STEP 2?
Ye s o r N o
Yes >>GOTO4.
No >> Malfunctioning temperature dial.
>> Replace A/C auto amp.
4.CHECK TO RETURN SELF-DIAGNOSIS STEP 1
1. Turn the temperature dial counterclockwise.
2. Return to self-diagnosis STEP 1?
Ye s o r N o
Yes >>GOTO5.
No >> Malfunctioning temperature dial.
>> Replace A/C auto amp.
5.STEP 2 - SENSOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT
1. Turn the temperature dial clockwise.
2. Does code No.20 appear on the display?
Ye s o r N o
Yes >>GOTO6.
No >> GO TO 13.
RJIA0491E
RHA970DB
Page 623 of 3066
TROUBLE DIAGNOSIS
ATC-45
C
D
E
F
G
H
I
K
L
MA
B
AT C
6.STEP 3 - MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED
1. Turn the temperature dial clockwise.
2. Does code No.30 appear on the display?
Ye s o r N o
Yes >>GOTO7.
No >> GO TO 14.
7.STEP 4 - OPERATION OF EACH ACTUATOR IS CHECKED
1. Turn the temperature dial clockwise.
2. Engine running.
3. Press DEF switch, code No. of each actuator test is indicated on
the display.
>> GO TO 8.
RHA869DD
RHA495A
Page 624 of 3066

ATC-46
TROUBLE DIAGNOSIS
8.CHECK ACTUATORS
Refer to the following chart and confirm discharge air flow, air tem-
perature, blower motor voltage and compressor operation.
Checks must be made visually, by listening to any noise, or by touching air outlets with your hand, etc. for
improper operation.
OK or NG
OK >> GO TO 9.
NG >>
lAir outlet does not change.
Go to Mode Door MotorAT C - 5 8
.
lIntake door does not change.
Go to Intake Door MotorAT C - 6 4
.
lBlower motor operation is malfunctioning.
Go to Blower MotorAT C - 6 7
.
lMagnet clutch does not engage.
Go to Magnet ClutchAT C - 7 3
.
lDischarge air temperature does not change.
Go to Air Mix Door MotorAT C - 6 1
.
9.STEP 5 - TEMPERATURE OF EACH SENSOR IS CHECKED
1. Turn the temperature dial clockwise.
2. Code No.51 appears on the display.
>> GO TO 10.
RJIA0492E
41 42 43 44 45 46
Mode door position VENT B/L B/L FOOT D/F DEF
Intake door position REC REC 20% FRE FRE FRE FRE
Air mix door position FULL COLD FULL COLD FULL HOT FULL HOT FULL HOT FULL HOT
Blower fan Approx. 4.5V Approx. 10.5V Approx. 8.5V Approx. 8.5V Approx. 8.5V Approx. 12V
Compressor ON ON OFF OFF ON ON
RHA359H