Page 649 of 3066

TROUBLE DIAGNOSIS
ATC-71
C
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E
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MA
B
AT C
1.CHECK POWER SUPPLY FOR BLOWER MOTOR
Disconnect blower motor harness connector.
OK or NG
OK >> GO TO 2.
NG >> Check power supply circuit and 15A fuses (Nos. 19 and
24, located in the fuse block). Refer toPG-3, "
BATTERY
POWER SUPPLY—IGNITION SW. IN ANY POSITION".
lIf OK, check for open circuit in wiring harness. Repair or replace as necessary.
lIf NG, replace fuse and check wiring harness for short circuit. Repair or replace as necessary.
2.CHECK FAN FEED BACK CIRCUIT
Disconnect auto amp. harness connector.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
3.CHECKBLOWERMOTOR
Refer to COMPONENT INSPECTION.
OK or NG
OK >> GO TO 4.
NG >> Replace blower motor.
4.CHECK POWER SUPPLY FOR FAN CONTROL AMP.
1. Reconnect blower motor connector and auto amp. connector.
2. Disconnect fan control amp. harness connector.
OK or NG
OK >> GO TO 5.
NG >> Repair harness or connector.
Te r m i n a l s
Vo l ta g e (+)
(-)
ConnectorTerminal (Wire
color)
M65 1 (L/W) Ground Approx. 12V
RJIA0524E
Te r m i n a l s
Vo l ta g e (+)
(-)
ConnectorTerminal (Wire
color)
M52 20 (L/W) Ground Approx. 12V
RJIA0525E
Terminals
Voltage (+)
(-)
COnnectorTerminal (Wire
color)
M67 3 (R) Ground Approx. 12V
RJIA0526E
Page 650 of 3066
ATC-72
TROUBLE DIAGNOSIS
5.CHECK BODY GROUND CIRCUIT FOR FAN CONTROL AMP.
OK or NG
OK >> GO TO 6.
NG >> Repair harness or connector.
6.CHECK FOR AUTO AMP. OUTPUT
Reconnect the fan control amp. harness connector.
OK or NG
OK >> GO TO 9.
NG >>
lIf the voltage is less than 2.5V: GO TO 7.
lIf the voltage is more than 9.0V: GO TO 8.
7.CHECK CIRCUIT CONTINUITY BETWEEN AUTO AMP. AND FAN CONTROL AMP.
Disconnect the auto amp. harness connector and fan control amp.
harness connector.
OK or NG
OK >> Replace fan control amp.
NG >> Repair harness or connector.
Te r m i n a l s
Continuity (+)
(-)
ConnectorTerminal (Wire
color)
M67 1 (B) Ground Yes
RJIA0527E
Te r m i n a l
Condition Voltage (+)
(-)
ConnectorTerminal
(Wire color)
M67 2 (L/Y) GroundFan speed: 1 -
4Approx. 2.5 -
3.5
Fan speed: 5 Approx. 9.0
RJIA0528E
Te r m i n a l s
Continuity Auto amp. Fan control amp.
ConnectorTerminal
(Wire color)ConnectorTe r m i n a l
(Wire color)
M52 17 (L/Y) M67 2 (L/Y) Yes
RJIA0529E
Page 651 of 3066
TROUBLE DIAGNOSIS
ATC-73
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AT C
8.CHECK FAN CONTROL AMP.
Disconnect the fan control amp. harness connector.
OK or NG
OK >> GO TO 9.
NG >> Replace fan control amp.
9.CHECK CIRCUIT CONTINUITY BETWEEN AUTO AMP. AND FAN CONTROL AMP.
OK or NG
OK >> Replace auto amp.
NG >> Repair harness or connector.
COMPONENT INSPECTION
Blower Motor
Confirm smooth rotation of the blower motor.
lEnsure that there are no foreign particles inside the intake unit.
Magnet Clutch CircuitEJS001H5
SYMPTOM: Magnet clutch does not engage.
Te r m i n a l s
Continuity
Connector Terminal Connector Terminal
M672M671 Yes
RJIA0530E
Te r m i n a l s
Continuity Auto amp. Fan control amp.
ConnectorTerminal
(Wire color)ConnectorTe r m i n a l
(Wire color)
M52 18 (R) M67 3 (R) Yes
RJIA0531E
RJIA0532E
Page 652 of 3066
ATC-74
TROUBLE DIAGNOSIS
INSPECTION FLOW
SYSTEM DESCRIPTION
Auto amplifier controls compressor operation by ambient temperature and signal from ECM.
*1 Self-diagnosisAT C - 4 2, see No.1. *6 Self-diagnosisAT C -4 2, see No. 14. *11 Operational checkAT C -5 1
*2 Ambient sensor circuitAT C - 9 3*7 Magnet clutch circuitAT C -7 3*12 Symptom tableAT C - 3 0
*3 In-vehicle sensor circuitAT C - 9 5*8 Trouble diagnoses for abnormal pres-
sureAT C -8 6*13 Intake sensor circuitATC-101
*4 Sunload sensor circuitAT C - 9 8*9 Operational checkAT C - 5 1
*5 Air mix door motor circuitAT C - 6 1*10 Self-diagnosisAT C -4 2,seeNo.7.
RJIA0533E
Page 653 of 3066
TROUBLE DIAGNOSIS
ATC-75
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AT C
Low Temperature Protection Control (With Gasoline Engine)
Auto amplifier will turn the compressor ON or OFF as determined by
a signal detected by ambient sensor.
When ambient temperatures are greater than -2°C(28°F), the com-
pressor turns ON. The compressor turns OFF when ambient temper-
atures are less than -5°C(23°F).
Evaporator Freeze Protection Control (With Diesel Engine)
Auto amplifier will turn the compressor ON or OFF as determined by
a signal detected by intake sensor.
When intake temperatures are greater than 4°C(39°F), the com-
pressor turns ON. The compressor turns OFF when intake tempera-
tures are less than 2.5°C (36.5°F).
DIAGNOSTIC PROCEDURE
SYMPTOM: Magnet clutch does not engage when A/C switch is ON.
RHA094GB
RJIA0534E
RJIA0535E
Page 654 of 3066

ATC-76
TROUBLE DIAGNOSIS
1.CHECK POWER SUPPLY FOR COMPRESSOR
Disconnect compressor harness connector.
OK or NG
OK >> Check magnet clutch coil.
1. If NG, replace magnet clutch. Refer toATC-129,
"Removal and Installation for Compressor Clutch".
2. Go to self-diagnosis step-by-step procedureAT C - 4 3
and perform self-diagnosis STEP-4.Con-
firm that magnet clutch operation is normal.
NG >>DisconnectA/Crelay.AndGOTO2.
2.CHECK CIRCUIT CONTINUITY BETWEEN A/C RELAY AND COMPRESSOR
OK or NG
OK >> Check harness for short. And GO TO 3.
NG >> Repair harness or connector.
3.CHECK POWER SUPPLY FOR A/C RELAY
Disconnect A/C relay.
OK or NG
OK >> GO TO 4.
NG >> Check power supply circuit and 10A (No.15) fuse at fuse
block. Refer toPG-3, "
BATTERY POWER SUPPLY—IGNITION SW. IN ANY POSITION".
lIf OK, check for open circuit in wiring harness. Repair or replace as necessary.
lIf NG, replace fuse and check wiring harness for short circuit. Repair or replace as necessary.
Te r m i n a l s
Vo l ta g e (+)
(-)
ConnectorTerminal (Wire
color
E34 1 (L/R) Ground Battery voltage
RJIA0295E
Te r m i n a l s
Continuity A/C relay Compressor
ConnectorTe r m i n a l
(Wire color)ConnectorTe r m i n a l
(Wire color)
E5 5 (L/R) E34 1 (L/R) Yes
RJIA0536E
Te r m i n a l s
Vo l ta g e (+)
(-)
ConnectorTerminal (Wire
color)
E5 1 (BR/Y)
Ground Battery voltage
E5 3 (BR/Y)
RJIA0537E
Page 655 of 3066

TROUBLE DIAGNOSIS
ATC-77
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AT C
4.CHECK A/C RELAY AFTER DISCONNECTING IT
Refer toAT C - 8 0 , "
A/C Relay".
OK or NG
OK >>ReconnectA/Crelay.AndGOTO5.
NG >> 1. replace A/C relay.
2. Go to self-diagnosis step-by-step procedure:ATC-43, "
PROCEDURE"and perform self-diag-
nosis STEP-4.Confirm that magnet clutch operation is normal.
5.CHECK COIL SIDE CIRCUIT OF A/C RELAY
OK or NG
OK >> GO TO 6.
NG >> Repair harness or connector.
6.CHECK AMBIENT SENSOR
Refer toAT C - 9 3 , "
Ambient Sensor Circuit".
OK or NG
OK >>lWith gasoline engine: GO TO 7.
lWith diesel engine: GO TO 14.
NG >> Repair or replace the malfunctioning part(s).
7.CHECK REFRIGERANT PRESSURE SENSOR (QR ENGINE)
Refer toAT C - 8 0 , "
Refrigerant Pressure Sensor (With gasoline engine)".
OK or NG
OK >> GO TO 8.
NG >> Repair or replace the malfunctioning part(s).
8.CHECK VOLTAGE FOR AUTO AMP. (COMPRESSOR ON SIGNAL)
OK or NG
OK >> GO TO 9.
NG >>
lIf the voltage is approx. 4.8V when the A/C switch is
ON: Replace the auto amp.
lIf the voltage is approx. 0V when the A/C switch is OFF: GO TO 12.
Engine modelsTe r m i n a l s
Vo l ta g e (+)
(-)
ConnectorTe r m i n a l
(Wire color)
With gasoline
engineF43 26 (L)
Ground Battery voltage
With diesel
engineF34 D11 (I)
RJIA0538E
Te r m i n a l s
Condition Voltage
(+) (-)
ConnectorTerminal (Wire
color)
GroundA/C SW: ON Approx. 0V
M52 4 (L/R) A/C SW: OFF Approx. 4.8V
RJIA0539E
Page 656 of 3066

ATC-78
TROUBLE DIAGNOSIS
9.CHECK VOLTAGE FOR AUTO AMP. (COMPRESSOR FEED BACK SIGNAL)
OK or NG
OK >> GO TO 10.
NG >> GO TO 13.
10.CHECK VOLTAGE FOR AUTO AMP. (FAN ON SIGNAL)
OK or NG
OK >> Replace auto amp.
NG >>
lIf the voltage is approx. 4.8 V when the blower fan is
ON: Replace the auto amp.
lIf the voltage is approx. 0 V when the blower fan is OFF: GO TO 11.
11 .CHECK CIRCUIT CONTINUITY BETWEEN ECM AND AUTO AMP.
Disconnect ECM connector and auto amp. connector.
OK or NG
OK >> INSPECTION END.
NG >> Repair harness or connector.
Te r m i n a l s
Condition Voltage (+)
(-)
ConnectorTe r m i n a l
(Wire color)
M53 30 (PU) GroundA/C SW: ON Approx. 0V
A/C SW: ON
(Disconnect
refrigerant pres-
sure sensor con-
nector)Approx. 4.8V
RJIA0540E
Te r m i n a l s
Condition Voltage (+)
(-)
ConnectorTe r m i n a l
(Wire color)
M52 19 (LG/B) GroundBlower fan: ON Approx. 0V
Blower fan: OFF Approx. 4.8V
RJIA0541E
terminals
Continuity ECM Auto amp.
ConnectorTerminal (Wire
coor)ConnectorTerminal (Wire
color)
F43 55 (LG/B) M52 19 (LG/B) Yes
RJIA0542E