Page 3489 of 4179

TROUBLE DIAGNOSIS
ATC-93
C
D
E
F
G
H
I
K
L
MA
B
AT C
12. CHECK CIRCUIT CONTINUITY BETWEEN ECM AND AUTO AMP. (QR ENGINE)
1. Turn ignition switch OFF.
2. Disconnect ECM connector and auto amp. connector.
3. Check continuity between ECM harness connector F43 terminal
110 (L/R) and auto amp. harness connector M52 terminal 4 (L/
R).
OK or NG
OK >> GO TO 13.
NG >> Repair harness or connector.
13. CHECK VOLTAGE FOR AUTO AMP. (COMPRESSOR ON SIGNAL)
Check voltage between auto amp. harness connector M52 terminal
4 (L/R) and ground.
OK or NG
OK >> Replace auto amp.
NG >> GO TO 17.
14. CHECK DUAL-PRESSURE SWITCH (YD ENGINE)
Refer to AT C - 9 5 , "
Dual-Pressure Switch (With Diesel Engine)" .
OK or NG
OK >> GO TO 15.
NG >> Replace the dual-pressure switch.
15. CHECK CIRCUIT CONTINUITY BETWEEN AUTO AMP. AND DUAL-PRESSURE SWITCH
1. Turn ignition switch OFF.
2. Disconnect the auto amp. connector.
3. Check continuity between auto amp. harness connector M52
terminal 4 (L/R) and dual-pressure switch harness connector
E40 terminal 2 (L/R).
OK or NG
OK >> GO TO 16.
NG >> Repair harness or connector.110 – 4 : Continuity should exist.
RJIA2838E
Terminals
Condition Voltage (+)
(-)
Auto amp.
connectorTerminal No.
(wire color)
M52 4 (L/R) GroundA/C SW: ON
(Blower motor
operates.)Approx. 0V
A/C SW: OFF Approx. 5V
RJIA2873E
4 – 2 : Continuity should exist.
RJIA0545E
Page 3490 of 4179

ATC-94
TROUBLE DIAGNOSIS
16. CHECK CIRCUIT CONTINUITY BETWEEN DUAL-PRESSURE SWITCH AND COMBINATION
METER
1. Disconnect the combination meter connector.
2. Check continuity between dual-pressure switch harness con-
nector E40 terminal 1 (PU/W) and combination meter harness
connector M44 terminal 7 (SB).
OK or NG
OK >> Check DI-22, "Trouble Diagnosis Chart for Symptom" in
DI.
NG >> Repair harness or connector.
17. CHECK REFRIGERANT PRESSURE SENSOR
Refer to EC-451, "
REFRIGERANT PRESSURE SENSOR" (WITH EUR-OBD) or EC-843, "REFRIGERANT
PRESSURE SENSOR" (WITHOUT EURO-OBD).
OK or NG
OK >> INSPECTION END.
NG >> Repair or replace the malfunctioning part(s).
COMPONENT INSPECTION
A/C Relay
Check continuity between terminal Nos. 3 and 5.
If NG, replace relay.
Refrigerant Pressure Sensor (With Gasoline Engine)
The refrigerant pressure sensor is attached to the liquid tank.1 – 7 : Continuity should exist.
SJIA0432E
Conditions Continuity
12V direct current supply between terminal Nos. 1
and 2Ye s
No current supply No
RHA638H
RJIA0690E
Page 3491 of 4179
TROUBLE DIAGNOSIS
ATC-95
C
D
E
F
G
H
I
K
L
MA
B
AT C
Dual-Pressure Switch (With Diesel Engine)
Thermal Protector (With diesel engine)
Check continuity between compressor harness terminal and field
coil.
RJIA2954E
Compressor: ON
kPa (bar, kg/cm2 , psi)Compressor: OFF
kPa (bar, kg/cm2 , psi)
Low-pressure side 186 (1.86, 1.9, 27) 177 (1.77, 1.8, 26)
High-pressure side 1,569 (15.7, 16, 228) 2,746 (27.5, 28, 398)
RJIA0691E
RHA671H
Page 3492 of 4179
ATC-96
TROUBLE DIAGNOSIS
Insufficient CoolingEJS004H2
SYMPTOM: Insufficient cooling
INSPECTION FLOW
*1ATC-65, "Operational Check".*2ATC-59, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 1.*3AT C - 5 9 , "
FUNCTION CONFIRMA-
TION PROCEDURE", see No. 5 to 7.
*4 QR engine; EM-13, "
Checking Drive
Belts" or YD engine; EM-131,
"Checking Drive Belts" .*5ATC-76, "
Air Mix Door Motor Circuit".*6ATC-100, "Test Reading (QR
Engine)" or ATC-101, "Test Reading
(YD Engine)" .
*7ATC-63, "
AUXILIARY MECHA-
NISM: TEMPERATURE SETTING
TRIMMER".*8ATC-59, "
FUNCTION CONFIRMA-
TION PROCEDURE", see No. 9.*9AT C - 6 9 , "
LAN System Circuit".
SJIA0408E
Page 3493 of 4179
TROUBLE DIAGNOSIS
ATC-97
C
D
E
F
G
H
I
K
L
MA
B
AT C
*10ATC-82, "Blower Motor Circuit".*11AT C - 8 8 , "Magnet Clutch Circuit". *12 QR engine; (WITH EURO-OBD) EC-
348, "System Description" .
QR engine; (WITHOUT EURO-OBD)
EC-700, "
System Description" .
YD engine; (WITH EURO-OBD) EC-
1011, "System Description" .
YD engine; (WITHOUT EURO-OBD)
EC-1320, "
System Description" .
*13ATC-98, "
PERFORMANCE TEST
DIAGNOSIS".
Page 3494 of 4179
ATC-98
TROUBLE DIAGNOSIS
PERFORMANCE TEST DIAGNOSIS
*1ATC-100, "PERFORMANCE
CHART".*2ATC-100, "
PERFORMANCE
CHART".*3ATC-102, "
TROUBLE DIAGNOSIS
FOR UNUSUAL PRESSURE".
*4ATC-76, "
Air Mix Door Motor Circuit".
RJIA1601E
Page 3495 of 4179
TROUBLE DIAGNOSIS
ATC-99
C
D
E
F
G
H
I
K
L
MA
B
AT C
*1ATC-146, "Removal and Installation
of Compressor Clutch".*2 AT C - 8 2 , "
Blower Motor Circuit" . *3 QR engine; EM-13, "Checking Drive
Belts" or YD engine; EM-131,
"Checking Drive Belts" .
RJIA3107E
Page 3496 of 4179

ATC-100
TROUBLE DIAGNOSIS
PERFORMANCE CHART
Test Condition
Testing must be performed as follows:
Test Reading (QR Engine)
Recirculating-to-discharge Air Temperature Table
Ambient Air Temperature-to-operating Pressure Table
Vehicle location Indoors or in the shade (in a well-ventilated place)
Doors Closed
Door windows Open
Hood Open
TEMP. Max. COLD
Mode control dial
(Ventilation) set
Intake switch
(Recirculation) set
Fan (blower) speedMax. speed set
Engine speed Idle speed
Operate the air conditioning system for 10 minutes before taking measurements.
Inside air (Recirculating air) at blower assembly inlet
Discharge air temperature at center ventilator
°C (°F) Relative humidity
%Air temperature
°C (°F)
50 - 6025 (77) 10.0 - 11.6 (50 - 53)
30 (86) 13.9 - 16.2 (57 - 61)
35 (95) 17.8 - 21.4 (64 - 71)
60 - 7025 (77) 11.6 - 13.9 (53 - 57)
30 (86) 16.2 - 18.9 (61 - 66)
35 (95) 21.4 - 24.5 (71 - 76)
Ambient air
High-pressure (Discharge side)
kPa (bar, kg/cm
2 , psi)Low-pressure (Suction side)
kPa (bar, kg/cm2 , psi) Relative humidity
%Air temperature
°C (°F)
50 - 7030 (86)980 - 1,180
(9.8 - 11.8, 9.99 - 12.04, 142 - 171)230 - 270
(2.3 - 2.7, 2.35 - 2.75, 33 - 39)
35 (95)1,180 - 1,390
(11.8 - 13.9, 12.04 - 14.18, 171 - 202)260 - 310
(2.6 - 3.1, 2.65 - 3.16, 38 - 45)
40 (104)1,400 - 1,580
(14.0 - 15.8, 14.28 - 16.12, 203 - 229)300 - 350
(3.0 - 3.5, 3.06 - 3.57, 44 - 51)