Page 2057 of 3189

TROUBLE DIAGNOSIS
ATC-77
C
D
E
F
G
H
I
K
L
MA
B
AT C
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 to ATC-138,
"Compressor Clutch" .
2. Go to AT C - 4 3 , "
FUNCTION CONFIRMATION PROCEDURE" and perform self-diagnosis
STEP-4. Confirm that magnet clutch operation is usual.
NG >> Disconnect A/C relay. And GO TO 2.
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 to EL-11, "POWER SUPPLY ROUTING" .
●If OK, check for open circuit in wiring harness. Repair or replace as necessary.
●If NG, replace fuse and check wiring harness for short circuit. Repair or replace as necessary.
4.CHECK A/C RELAY AFTER DISCONNECTING IT
Refer to ATC-85, "
A/C Relay" .
OK or NG
OK >> Reconnect A/C relay. And GO TO 5.
NG >> 1. Replace A/C relay.
2. Go to AT C - 4 3 , "
FUNCTION CONFIRMATION PROCEDURE" and perform self-diagnosis
STEP-4. Confirm that magnet clutch operation is usual.
Terminal
Vo lta g e (+)
(-)
Compressor
connectorTe r m i n a l N o .
(Wire color)
E25 1 (L/R) Ground Battery voltage
RJIA0295E
Terminal
Continuity (+) (-)
A/C relay con-
nectorTerminal No.
(Wire color)Compressor
connectorTerminal No.
(Wire color)
E9 3 (L/R) E25 1 (L/R) Yes
RJIA0793E
Terminal
Vo l ta g e (+)
(-)
A/C relay con-
nectorTerminal No.
(Wire color)
E9 1 (L/Y)
Ground Battery voltage
E9 5 (L/Y)
RJIA0794E
Page 2058 of 3189

ATC-78
TROUBLE DIAGNOSIS
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 to ATC-100, "
Ambient Sensor Circuit" .
OK or NG
OK >>●With gasoline engine: GO TO 7.
●With diesel engine: GO TO 8.
NG >> Repair or replace the malfunctioning part(s).
7. CHECK REFRIGERANT PRESSURE SENSOR (WITH GASOLINE ENGINE)
Refer to AT C - 8 5 , "
Refrigerant Pressure Sensor (With Gasoline Engine)" .
OK or NG
OK >> GO TO 8.
NG >> Repair or replace the malfunctioning part(s).
8. CHECK COMPRESSOR FEED BACK SIGNAL
OK or NG
OK >> GO TO 9.
NG >> GO TO 16.
Terminal
Continuity (+) (-)
A/C relay
connectorTerminal No.
(Wire color)Smart
entrance con-
trol unit con-
nectorTerminal No.
(Wire color)
E9 2 (L) M195 41 (L) Yes
RJIA0795E
Terminal
Condition Voltage (+)
(-)
Auto amp.
connectorTerminal No.
(Wire color)
M204 18 (BR/W) GroundA/C SW: ON Approx. 0V
A/C SW: ON
(When refriger-
ant pressure sen-
sor connector is
disconnected)Approx. 5V
RJIA0796E
Page 2059 of 3189

TROUBLE DIAGNOSIS
ATC-79
C
D
E
F
G
H
I
K
L
MA
B
AT C
9.CHECK FAN ON SIGNAL
OK or NG
OK >> GO TO 10.
NG >>
●If the voltage is approx. 5V when the blower fan is
ON: Replace the auto amp.
●If the voltage is approx. 0V when the blower fan is OFF: GO TO 17.
10.CHECK COMPRESSOR ON SIGNAL
OK or NG
OK >> GO TO 11.
NG >>
●If the voltage is approx. 5V when the A/C switch is
ON: Replace the auto amp.
●If the voltage is approx. 0V when the A/C switch is OFF.
–With gasoline engine: GO TO 18.
–With diesel engine: GO TO 13.
11 . CHECK MULTIPLEX COMMUNICATION CIRCUIT
Refer to ATC-109, "
Multiplex Communication Circuit" .
OK or NG
OK >> GO TO 12.
NG >> Repair harness or connector.
12.CHECK CAN CIRCUIT
Refer to CAN communication. EL-509, "CAN COMMUNICATION".
OK or NG
OK >> INSPECTION END.
NG >> Repair or replace malfunctioning part(s).
Terminal
Condition Voltage (+)
(-)
Auto amp.
connectorTerminal No.
(Wire color)
M205 29 (LG/B) GroundBlower fan: ON Approx. 0V
Blower fan: OFF Approx. 5V
RJIA0797E
Terminal
Condition Voltage (+)
(-)
Auto amp.
connectorTerminal No.
(Wire color)
M205 22 (L/R) GroundA/C SW: ON Approx. 0V
A/C SW: OFF Approx. 5V
RJIA0798E
Page 2060 of 3189

ATC-80
TROUBLE DIAGNOSIS
13. CHECK CIRCUIT CONTINUITY BETWEEN DUAL-PRESSURE SWITCH AND AUTO AMP. (WITH
DIESEL ENGINE)
Disconnect dual-pressure switch connector and auto amp. connec-
tor.
OK or NG
OK >> GO TO 14.
NG >> Repair harness or connector.
14. CHECK DUAL-PRESSURE SWITCH CIRCUIT (WITH DIESEL ENGINE)
Refer to AT C - 8 5 , "
Dual-Pressure Switch (With Diesel Engine)" .
OK or NG
OK >> GO TO 15.
NG >> Repair or replace malfunctioning part(s).
15. CHECK CIRCUIT CONTINUITY BETWEEN DUAL-PRESSURE SWITCH AND COMBINATION
METER (WITH DIESEL ENGINE)
Disconnect combination meter connector.
OK or NG
OK >> GO TO 14.
NG >> Repair harness or connector.
16. CHECK CIRCUIT CONTINUITY BETWEEN COMBINATION METER AND AUTO AMP.
Disconnect combination meter connector and auto amp. connector.
OK or NG
OK >> GO TO 11.
NG >> Repair harness or connector.
Terminal
Continuity (+) (-)
Dual–pres-
sure switch
connectorTe r m i n a l N o .
(Wire color)Auto amp.
connectorTerminal No.
(Wire color)
E51 1 (L/R) M205 22 (L/R) Yes
RJIA1699E
Terminal
Continuity (+) (-)
Dual-pres-
sure switch
connectorTe r m i n a l N o .
(Wire color)Combination
meter connec-
torTerminal No.
(Wire color)
E51 2 (P/U) M171 39 (PU) Yes
RJIA1700E
Terminal
Continuity (+) (-)
Combination
meter connec-
torTe r m i n a l N o .
(Wire color)Auto amp.
connectorTerminal No.
(Wire color)
M171 58 (BR/W) M204 18 (BR/W) Yes
RJIA1701E
Page 2061 of 3189
TROUBLE DIAGNOSIS
ATC-81
C
D
E
F
G
H
I
K
L
MA
B
AT C
17.CHECK CIRCUIT CONTINUITY BETWEEN COMBINATION METER AND AUTO AMP.
Disconnect combination meter connector and auto amp. connector.
OK or NG
OK >> GO TO 11.
NG >> Repair harness or connector.
18.CHECK CIRCUIT CONTINUITY BETWEEN COMBINATION METER AND AUTO AMP. (WITH GASO-
LINE ENGINE)
Disconnect combination meter connector and auto amp. connector.
OK or NG
OK >> GO TO 11.
NG >> Repair harness or connector.
DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH (YD ENGINE WITHOUT COMMON RAIL)
SYMPTOM: Magnet clutch does not engage when A/C switch is ON.
Terminal
Continuity (+) (-)
Combination
meter connec-
torTerminal No.
(Wire color)Auto amp.
connectorTerminal No.
(Wire color)
M171 45 (LG/B) M205 29 (LG/B) Yes
RJIA1702E
Terminal
Continuity (+) (-)
Combination
meter connec-
torTerminal No.
(Wire color)Auto amp.
connectorTerminal No.
(Wire color)
M171 39 (L/R) M205 22 (L/R) Yes
RJIA1703E
RJIA1704E
Page 2062 of 3189

ATC-82
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 to ATC-138,
"Compressor Clutch" .
2. Go to AT C - 4 3 , "
FUNCTION CONFIRMATION PROCEDURE" and perform self-diagnosis
STEP-4. Confirm that magnet clutch operation is usual.
NG >> Disconnect A/C relay. And GO TO 2.
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 to EL-11, "POWER SUPPLY ROUTING".
●If OK, check for open circuit in wiring harness. Repair or replace as necessary.
●If NG, replace fuse and check wiring harness for short circuit. Repair or replace as necessary.
4. CHECK A/C RELAY AFTER DISCONNECTING IT
Refer to AT C - 8 5 , "
A/C Relay" .
OK or NG
OK >> Reconnect A/C relay. And GO TO 5.
NG >> 1. Replace A/C relay.
2. Go to AT C - 4 3 , "
FUNCTION CONFIRMATION PROCEDURE" and perform self-diagnosis
STEP-4. Confirm that magnet clutch operation is usual.
Te r m i n a l
Voltag e (+)
(-)
Compressor
connectorTerminal No.
(Wire color)
E25 1 (L/R) Ground Battery voltage
RJIA0295E
Terminal
Continuity (+) (-)
A/C relay con-
nectorTerminal No.
(Wire color)Compressor
connectorTe r m i n a l N o .
(Wire color)
E9 3 (L/R) E25 1 (L/R) Yes
RJIA0793E
Te r m i n a l
Voltage (+)
(-)
A/C relay con-
nectorTerminal No.
(Wire color)
E9 1 (L/Y)
Ground Battery voltage
E9 5 (L/Y)
RJIA0794E
Page 2063 of 3189

TROUBLE DIAGNOSIS
ATC-83
C
D
E
F
G
H
I
K
L
MA
B
AT C
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 to ATC-100, "
Ambient Sensor Circuit" .
OK or NG
OK >> GO TO 7.
NG >> Repair or replace the malfunctioning part(s).
7.CHECK COMPRESSOR FEED BACK SIGNAL
OK or NG
OK >> GO TO 9.
NG >> GO TO 13.
8.CHECK COMPRESSOR ON SIGNAL
OK or NG
OK >> GO TO 9.
NG >>
●If the voltage is approx. 5V when the A/C switch is
ON: Replace the auto amp.
●If the voltage is approx. 0V when the A/C switch is OFF: GO TO 10.
Terminal
Continuity (+) (-)
A/C relay
connectorTerminal No.
(Wire color)ECM connec-
torTerminal No.
(Wire color)
E9 2 (L) F58 204 (L) Yes
RJIA1705E
Terminal
Condition Voltage (+)
(-)
Auto amp.
connectorTe r m i n a l N o .
(Wire color)
M75 18 (BR/W) GroundA/C SW: ON Approx. 0V
A/C SW: OFF Approx. 5V
RJIA0796E
Terminal
Condition Voltage (+)
(-)
Auto amp.
connectorTerminal No.
(Wire color)
M205 22 (L/R) GroundA/C SW: ON Approx. 0V
A/C SW: OFF Approx. 5V
RJIA0798E
Page 2064 of 3189

ATC-84
TROUBLE DIAGNOSIS
9. CHECK MULTIPLEX COMMUNICATION CIRCUIT
Refer to ATC-109, "
Multiplex Communication Circuit" .
OK or NG
OK >> INSPECTION END
NG >> Repair harness or connector.
10. CHECK CIRCUIT CONTINUITY BETWEEN DUAL-PRESSURE SWITCH AND AUTO AMP.
Disconnect dual-pressure switch connector and auto amp. connec-
tor.
OK or NG
OK >> GO TO 11.
NG >> Repair harness or connector.
11 . CHECK DUAL-PRESSURE SWITCH CIRCUIT
Refer to AT C - 8 5 , "
Dual-Pressure Switch (With Diesel Engine)" .
OK or NG
OK >> GO TO 12.
NG >> Repair or replace malfunctioning part(s).
12. CHECK CIRCUIT CONTINUITY BETWEEN DUAL-PRESSURE SWITCH AND ECM
Disconnect ECM connector.
OK or NG
OK >> GO TO 9.
NG >> Repair harness or connector.
13. CHECK CIRCUIT CONTINUITY BETWEEN COMPRESSOR AND AUTO AMP.
Disconnect compressor connector and auto amp. connector.
OK or NG
OK >> INSPECTION END
NG >> Repair harness or connector.
Terminal
Continuity (+) (-)
Dual-pres-
sure switch
connectorTe r m i n a l N o .
(Wire color)Auto amp.
connectorTerminal No.
(Wire color)
E51 1 (L/R) M205 22 (L/R) Yes
RJIA1699E
Terminal
Continuity (+) (-)
Dual-pres-
sure switch
connectorTe r m i n a l N o .
(Wire color)ECM connec-
torTerminal No.
(Wire color)
E51 2 (R/L) F60 403 (R/L) Yes
RJIA1706E
Terminal
Continuity (+) (-)
Compressor
connectorTe r m i n a l N o .
(Wire color)Auto amp.
connectorTerminal No.
(Wire color)
E25 1 (L/R) M75 18 (BR/W) Yes
RJIA1707E