Infiniti F50. Manual — part 141
TROUBLE DIAGNOSIS
ATC-89
C
D
E
F
G
H
I
K
L
M
A
B
ATC
5.
CHECK COIL SIDE CIRCUIT OF A/C RELAY
1.
Turn ignition switch OFF.
2.
Reconnect A/C relay.
3.
Turn ignition switch ON.
4.
Check voltage between ECM harness connector F101 terminal
24 (G/W) and ground.
OK or NG
OK
>> GO TO 7.
NG
>> GO TO 6.
6.
CHECK CIRCUIT CONTINUITY BETWEEN ECM AND A/C RELAY
1.
Turn ignition switch OFF.
2.
Disconnect A/C relay and ECM connector.
3.
Check continuity between ECM harness connector F101 termi-
nal 24 (G/W) and A/C relay harness connector E3-2 terminal
1(L/Y).
OK or NG
OK
>> Replace A/C relay.
NG
>> Repair harness or connector.
7.
CHECK VOLTAGE FOR COMBINATION METER (FAN ON SIGNAL)
1.
Turn ignition switch ON.
2.
Check voltage between auto amp. harness connector M120 ter-
minal 29 (SB) and ground.
OK or NG
OK
>> GO TO 8.
NG
>> GO TO 11.
24 – Ground
: Battery voltage
RJIA0298E
24 – 1
: Continuity should exist.
RJIA0299E
Terminals
Condition
Voltage
(+)
(-)
Auto amp.
connector
Terminal No.
(Wire color)
M120
29 (SB)
Ground
Blower fan: ON
Approx. 0V
Blower fan: OFF
Approx. 5V
RJIA0300E
ATC-90
TROUBLE DIAGNOSIS
8.
CHECK VOLTAGE FOR COMBINATION METER (COMPRESSOR ON SIGNAL)
Check voltage between auto amp. harness connector M120 terminal
22 (Y) and ground.
OK or NG
OK
>> GO TO 9.
NG
>> GO TO 12.
9.
CHECK VOLTAGE FOR COMBINATION METER (COMPRESSOR FEED BACK SIGNAL)
1.
Start engine and AUTO switch ON.
2.
Check voltage between auto amp. harness connector M119 ter-
minal 18 (OR) and ground.
OK or NG
OK
>> GO TO 10.
NG
>> GO TO 13.
10.
CHECK REFRIGERANT PRESSURE SENSOR CIRCUIT
Refer to
EC-672, "REFRIGERANT PRESSURE SENSOR"
OK or NG
OK
>> INSPECTION END
NG
>> Repair or replace the malfunctioning part(s).
11.
CHECK CIRCUIT CONTINUITY BETWEEN COMBINATION METER AND AUTO AMP.
1.
Turn ignition switch OFF.
2.
Disconnect combination meter and auto amp. connector.
3.
Check continuity between combination meter harness connector
M42 terminal 35 (SB) and auto amp. harness connector M120
terminal 29 (SB).
OK or NG
OK
>> Replace auto amp.
NG
>> Repair harness or connector.
Terminals
Condition
Voltage
(+)
(-)
Auto amp.
connector
Terminal No.
(Wire color)
M120
22 (Y)
Ground
AUTO SW: ON
Approx. 0V
AUTO SW: OFF
Approx. 5V
RJIA0301E
Terminals
Condition
Voltage
(+)
(-)
Auto amp.
connector
Terminal No.
(Wire color)
M119
18 (OR)
Ground
AUTO SW: ON
Approx. 0V
AUTO SW: ON
(When refrigerant
pressure sensor
connector is dis-
connected)
Approx. 5V
RJIA0302E
35 – 29
: Continuity should exist.
RJIA0303E
TROUBLE DIAGNOSIS
ATC-91
C
D
E
F
G
H
I
K
L
M
A
B
ATC
12.
CHECK CIRCUIT CONTINUITY BETWEEN COMBINATION METER AND AUTO AMP.
1.
Turn ignition switch OFF.
2.
Disconnect combination meter and auto amp. connector.
3.
Check continuity between combination meter harness connector
M42 terminal 34 (Y) and auto amp. harness connector M120 ter-
minal 22 (Y).
OK or NG
OK
>> Replace auto amp.
NG
>> Repair harness or connector.
13.
CHECK CIRCUIT CONTINUITY BETWEEN COMBINATION METER AND AUTO AMP.
1.
Turn ignition switch OFF.
2.
Disconnect combination meter and auto amp. connector.
3.
Check continuity between combination meter harness connector
M42 terminal 24 (OR) and auto amp. harness connector M119
terminal 18 (OR).
OK or NG
OK
>> Check combination meter.
NG
>> Repair harness or connector.
COMPONENT INSPECTION
A/C Relay
Check continuity between terminal Nos. 3 and 5.
If NG, replace relay.
Refrigerant Pressure Sensor
The refrigerant pressure sensor is attached to the condenser.
34 – 22
: Continuity should exist.
RJIA0304E
24 – 18
: Continuity should exist.
RJIA0305E
Conditions
Continuity
12V direct current supply between terminal Nos. 1
and 2
Yes
No current supply
No
SEF090M
RJIA1301E
ATC-92
TROUBLE DIAGNOSIS
Insufficient Cooling
EJS000JU
SYMPTOM: Insufficient cooling
INSPECTION FLOW
*1
ATC-54, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No.1.
*2
ATC-74, "Air Mix Door Motor Circuit"
. *3
*4
ATC-61, "AUXILIARY MECHANISM:
TEMPERATURE SETTING TRIM-
MER"
*5
ATC-54, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 14.
*6
*7
ATC-81, "Blower Motor Circuit"
.
*8
ATC-86, "Magnet Clutch Circuit"
.
*9
ATC-93, "PERFORMANCE TEST
DIAGNOSES"
*10
.
*11
ATC-54, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No.5 to 7.
*12
ATC-5, "CONTAMINATED REFRIG-
ERANT"
*13
*14
RJIA1594E
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