Nissan Primera P11. Instruction — part 480
p
C
CHECK COIL SIDE CIRCUIT OF A/C
RELAY
Do approx.
12 volts
exist between ECM
harness terminal No.
p
23
and body
ground?
Yes
E
No
Disconnect A/C relay.
Disconnect ECM harness
connector.
Note
CHECK CIRCUIT CON-
TINUITY BETWEEN A/C
RELAY HARNESS TER-
MINAL NO.
p
1
AND
ECM HARNESS TERMI-
NAL NO.
p
23
.
Continuity should exist.
If OK, check harness for
short.
CHECK VOLTAGE FOR ECM.
Do approx.
12 volts
exist between ECM
harness terminal No.
p
44
and body
ground?
Yes
E
No
CHECK ECM. Refer to
EC section.
Disconnect ECM harness connector.
Disconnect refrigerant pressure sensor
harness connector.
Yes
Note
CHECK CIRCUIT CONTINUITY
BETWEEN ECM HARNESS TERMINAL
NO.
p
74
AND PRESSURE SENSOR
HARNESS TERMINAL NO.
p
2
.
Continuity should exist.
If OK, check harness for short.
CHECK PRESSURE SENSOR.
Refer to HA-80.
OK
E
NG
Replace pressure sensor.
p
D
(Go to next page.)
YHA281
ECM connector
YHA282
A/C relay
connector
ECM connector
NHA458
ECM connector
YHA273
ECM connector
Refrigerant pres-
sure sensor con-
nector
H
H
H
H
H
H
H
TROUBLE DIAGNOSES
AUTO
Diagnostic Procedure 10 (Cont’d)
HA-73
p
D
CHECK FOR A/C CONTROL PANEL
OPERATION.
Does approx.
0.5V
exist between A/C
control panel harness terminal No.
p
10
and body ground?
OK
E
NG
Replace A/C control
panel.
Note
Check circuit continuity between control
panel harness terminal No.
p
10
and
thermo control amp. No.
p
2
.
OK
Check ECM.
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
Diagnostic Procedure 11
SYMPTOM: Ambient sensor circuit is open or shorted.
CHECK AMBIENT SENSOR CIRCUIT
BETWEEN AMBIENT SENSOR AND
AUTO AMP.
Disconnect ambient sensor harness con-
nector.
Do approx.
5 volts
exist between ambient
sensor harness terminal No.
p
1
and body
ground?
OK
E
NG
Disconnect auto amp. har-
ness connector.
Note
Check circuit continuity
between auto amp. harness
terminal No.
p
8
and ambi-
ent sensor harness terminal
No.
p
1
, and between auto
amp. harness terminal No.
p
8
and body ground.
OK
Disconnect auto amp. harness connector.
Replace auto amp.
Note
Check circuit continuity between ambient
sensor harness terminal No.
p
2
and auto
amp. harness terminal No.
p
5
.
OK
CHECK AMBIENT SENSOR.
(Refer to HA-86.)
OK
E
NG
Replace ambient sensor.
Replace auto amp.
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
NHA453
A/C control panel
connector
YHA275
Thermo control
amp.
Control panel
connector
YHA283
Ambient sensor con-
nector
YHA284
Auto amp. connector
Ambient sensor
connector
YHA285
Auto amp. connector
Ambient sensor
connector
H
H
H
H
H
H
H
H
H
TROUBLE DIAGNOSES
AUTO
Diagnostic Procedure 10 (Cont’d)
HA-74
Diagnostic Procedure 12
SYMPTOM: In-vehicle sensor circuit is open or shorted.
CHECK IN-VEHICLE SENSOR CIR-
CUIT BETWEEN IN-VEHICLE SEN-
SOR AND AUTO AMP.
Disconnect in-vehicle sensor harness
connector.
Do approx.
5 volts
exist between in-
vehicle sensor harness terminal No.
p
1
and body ground?
OK
E
NG
Disconnect auto amp.
harness connector.
Disconnect auto amp. harness con-
nector.
Note
Check circuit continuity
between auto amp. har-
ness terminal No.
p
7
and in-vehicle sensor
harness terminal No.
p
1
, and between auto
amp. harness terminal
No.
p
7
and body
ground.
OK
Note
Check circuit continuity between in-
vehicle sensor harness terminal No.
p
2
and auto amp. harness terminal
No.
p
8
.
OK
Replace auto amp.
CHECK IN-VEHICLE SENSOR.
(Refer to HA-85.)
OK
E
NG
Replace in-vehicle sen-
sor.
Replace auto amp.
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
YHA286
In-vehicle sensor
connector
YHA287
Auto amp. connector
In-vehicle sensor
connector
YHA288
Auto amp. connector
In-vehicle sensor
connector
H
H
H
H
H
H
TROUBLE DIAGNOSES
AUTO
HA-75
Diagnostic Procedure 13
SYMPTOM: Sunload sensor circuit is open or shorted.
CHECK SUNLOAD SENSOR CIR-
CUIT BETWEEN SUNLOAD SENSOR
AND AUTO AMP.
Disconnect sunload sensor harness
connector.
Do approx.
5 volts
exist between sun-
load sensor harness terminal No.
p
1
and body ground?
OK
E
NG
Disconnect auto amp.
harness connector.
Note
Check circuit continuity
between auto amp. har-
ness terminal No.
p
6
and sunload sensor har-
ness terminal No.
p
1
and between auto amp.
harness terminal No.
p
6
and body ground.
OK
Disconnect auto amp. harness connec-
tor.
Replace auto amp.
Note
Check circuit continuity between sun-
load sensor harness terminal No.
p
2
and auto amp. harness terminal No.
p
5
.
OK
CHECK SUNLOAD SENSOR.
(Refer to HA-86.)
OK
E
NG
Replace sunload sensor.
Replace auto amp.
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
YHA289
Sunload sensor
connector
YHA290
Auto amp. connector
Sunload sensor
connector
YHA291
Auto amp. connector
Sunload sensor
connector
H
H
H
H
H
H
TROUBLE DIAGNOSES
AUTO
HA-76
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