1999 NISSAN PRIMERA sensor

pA
Note
Check circuit continuity between LO relay
harness terminal No.
p5and body ground.
OK
CHECK LO RELAY AFTER DISCON-
NECTING IT.
ENG
Replace LO relay.
Diagnostic Procedure 3: Models with relay
type 1
SYMPTOM: Blower motor fan speed does not change when
fan speed is in AUTO. (Fan speed is fixed in
HIGH or MED.)
C/R*1Note
CHECK AUTO AMP. AND PTC.
Connect checking resistor.
(Refer to HA-51.)
Does blower motor fan speed change
when you move PTC from 18ÉC (64ÉF)
to 32ÉC (90ÉF)?
OK
ENG
CHECK PTC CIRCUIT
BETWEEN CONTROL
PANEL AND AUTO
AMP.
Disconnect control panel
and auto amp. harness
connectors.
Check circuit continuity
between control panel
harness terminal No.
p21and auto amp. har-
ness terminal No.
p4.
OK
CHECK SENSOR CIRCUIT.
Note
Check circuit continuity
between control panel
harness terminal No.
p25and auto amp. har-
ness terminal No.
p5.
OK
Reconnect control panel harness con-
nector.
FOK
CHECK A/C CONTROL
PANEL.
(Refer to HA-51.)
NG
Replace A/C Control
panel.
pA
(Go to next page.)
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
How to repair
Ambient sensor
circuitGo to Diagnostic
Procedure 11.
In-vehicle sensor
circuitGo to Diagnostic
Procedure 12.
YHA384
YHA262
Control panel
connectorAuto amp.
connector
YHA263
Auto amp.
connectorControl panel
connector
H
H
HH
H
H
H
TROUBLE DIAGNOSESAUTO
Diagnostic Procedure 2: Models with relay
type 2 (Cont'd)
HA-57

Diagnostic Procedure 3: Models with relay
type 2
SYMPTOM: Blower motor fan speed does not change when
fan speed is in AUTO. (Fan speed is fixed in
HIGH or MED.)
C/R*1Note
CHECK AUTO AMP. AND PTC.
Connect checking resistor.
(Refer to HA-51.)
Does blower motor fan speed change
when you move PTC from 18ÉC (64ÉF)
to 32ÉC (90ÉF)?
OK
ENG
CHECK PTC CIRCUIT
BETWEEN CONTROL
PANEL AND AUTO
AMP.
Disconnect control panel
and auto amp. harness
connectors.
Check circuit continuity
between control panel
harness terminal No.
p21and auto amp. har-
ness terminal No.
p4.
OK
CHECK SENSOR CIRCUIT.
Note
Check circuit continuity
between control panel
harness terminal No.
p25and auto amp. har-
ness terminal No.
p5.
OK
Reconnect control panel harness con-
nector.
FOK
CHECK A/C CONTROL
PANEL.
(Refer to HA-51.)
NG
Replace A/C Control
panel.
pA
(Go to next page.)
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
How to repair
Ambient sensor
circuitGo to Diagnostic
Procedure 11.
In-vehicle sensor
circuitGo to Diagnostic
Procedure 12.
YHA262
Control panel
connectorAuto amp.
connector
YHA263
Auto amp.
connectorControl panel
connector
HH
H
H
H
TROUBLE DIAGNOSESAUTO
HA-59

pA
CHECK IN-VEHICLE SENSOR AND
AMBIENT SENSOR.
(Refer to Control System Input Compo-
nents.) (HA-85, 86)
OK
ENG
Replace in-vehicle sen-
sor or ambient sensor.
CHECK SUNLOAD SENSOR.
Go toDiagnostic Procedure 13. (HA-
76)
OK
ENG
Replace sunload sensor
or auto amp.
CHECK AUTO AMP. OPERATION.
Do approx.0.5 voltsexist between
auto amp. harness terminal No.
p9
and body ground when A/C switch
is ON?
Do approx. 0 volts exist between
auto amp. harness terminal No.
p9
and body ground when A/C switch
is OFF?
OK
ENG
CHECK A/C CONTROL
PANEL OPERATION.
Do approx.0.5 volts
exist between A/C con-
trol panel connector ter-
minal No.
p29and body
ground when A/C switch
is ON?
OK NG
Replace
A/C con-
trol panel
Replace auto amp.
Note
Check circuit continuity
between A/C control
panel harness terminal
p29and Auto amp. har-
ness terminal
p9
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
RHA037H
CONNECT
Auto amp.
connectorM421
Auto amp.
connectorM421
H
H
HH
H
HH
TROUBLE DIAGNOSESAUTO
Diagnostic Procedure 6 (Cont'd)
HA-67

Diagnostic Procedure 7
SYMPTOM: Air mix door motor does not operate normally.
lPerform PRELIMINARY CHECK 2 before referring to the
following flow chart.
C/R*2Note
CHECK AUTO AMP. AND PTC.
Connect checking resistor.
(Refer to page HA-30.)
Does air outlet temperature change
when you move PTC from 20ÉC (68ÉF)
to 30ÉC (86ÉF)?
OK
ENG
CHECK PTC CIRCUIT
BETWEEN PTC AND
AUTO AMP.
Disconnect control panel
and auto amp. harness
connectors.
Check circuit continuity
between control panel
harness terminal No.
p21and auto amp. har-
ness terminal No.
p4.
OK
CHECK SENSOR CIRCUIT.
Note
Check circuit continuity
between control panel
harness terminal No.
p25and auto amp. har-
ness terminal No.
p5.
OK
CHECK PTC.
(Refer to HA-84.)
OK
ENG
Replace A/C control
panel.
CHECK FOR OUTPUT OF AUTO
AMP.
Connect checking resistor.
Do approx. 10.5 volts exist between air
mix door motor harness terminals No.
p4andp1when you move PTC
from 18ÉC (64ÉF) to 32ÉC (90ÉF) or
when you move PTC from 32ÉC (90ÉF)
to 18ÉC (64ÉF)?
OK
ENG
Disconnect auto amp.
and air mix door motor
harness connectors.
Note
Check circuit continuity
between auto amp. har-
ness terminal No.
p12
(p13) and air mix door
motor harness terminal
No.
p1(p4).
OK
Replace auto amp.
Replace air mix door motor.
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
How to repair
Ambient sensor
circuitGo to Diagnostic
Procedure 11.
In-vehicle sensor
circuitGo to Diagnostic
Procedure 12.
Air mix door
operationTerminal No.
Voltage
p1p4
Cold,Hot!@
Approx.
10.5V
Hot,Cold@
!
Stop Ð Ð0V
YHA262
Control panel
connectorAuto amp.
connector
YHA263
Auto amp.
connectorControl panel
connector
NHA303
Air mix door motor
connector
HH
H
H
H
H
H
TROUBLE DIAGNOSESAUTO
HA-68

pC
CHECK COIL SIDE CIRCUIT OF A/C
RELAY
Do approx.12 voltsexist between ECM
harness terminal No.
p23and body
ground?
Ye s
ENo
Disconnect A/C relay.
Disconnect ECM harness
connector.
Note
CHECK CIRCUIT CON-
TINUITY BETWEEN A/C
RELAY HARNESS TER-
MINAL NO.
p1AND
ECM HARNESS TERMI-
NAL NO.
p23.
Continuity should exist.
If OK, check harness for
short.
CHECK VOLTAGE FOR ECM.
Do approx.12 voltsexist between ECM
harness terminal No.
p44and body
ground?
Ye s
ENo
CHECK ECM. Refer to
EC section.
Disconnect ECM harness connector.
Disconnect refrigerant pressure sensor
harness connector.
Ye s
Note
CHECK CIRCUIT CONTINUITY
BETWEEN ECM HARNESS TERMINAL
NO.
p74AND PRESSURE SENSOR
HARNESS TERMINAL NO.
p2.
Continuity should exist.
If OK, check harness for short.
CHECK PRESSURE SENSOR.
Refer to HA-80.
OK
ENG
Replace pressure sensor.
pD
(Go to next page.)
YHA281
ECM connector
YHA282
A/C relay
connectorECM connector
NHA458
ECM connector
YHA273
ECM connector
Refrigerant pres-
sure sensor con-
nector
H
H
H
H
H
H
H
TROUBLE DIAGNOSESAUTO
Diagnostic Procedure 10 (Cont'd)
HA-73

pD
CHECK FOR A/C CONTROL PANEL
OPERATION.
Does approx.0.5Vexist between A/C
control panel harness terminal No.
p10
and body ground?
OK
ENG
Replace A/C control
panel.
Note
Check circuit continuity between control
panel harness terminal No.
p10and
thermo control amp. No.
p2.
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 voltsexist between ambient
sensor harness terminal No.
p1and body
ground?
OK
ENG
Disconnect auto amp. har-
ness connector.
Note
Check circuit continuity
between auto amp. harness
terminal No.
p8and ambi-
ent sensor harness terminal
No.
p1, and between auto
amp. harness terminal No.
p8and body ground.
OK
Disconnect auto amp. harness connector.
Replace auto amp.
Note
Check circuit continuity between ambient
sensor harness terminal No.
p2and auto
amp. harness terminal No.
p5.
OK
CHECK AMBIENT SENSOR.
(Refer to HA-86.)
OK
ENG
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
HH
H
H
H
TROUBLE DIAGNOSESAUTO
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 voltsexist between in-
vehicle sensor harness terminal No.
p1and body ground?
OK
ENG
Disconnect auto amp.
harness connector.
Disconnect auto amp. harness con-
nector.
Note
Check circuit continuity
between auto amp. har-
ness terminal No.
p7
and in-vehicle sensor
harness terminal No.
p1, and between auto
amp. harness terminal
No.
p7and body
ground.
OK
Note
Check circuit continuity between in-
vehicle sensor harness terminal No.
p2and auto amp. harness terminal
No.
p8.
OKReplace auto amp.
CHECK IN-VEHICLE SENSOR.
(Refer to HA-85.)
OK
ENG
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. connectorIn-vehicle sensor
connector
YHA288
Auto amp. connector In-vehicle sensor
connector
HH
HH
H
H
TROUBLE DIAGNOSESAUTO
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 voltsexist between sun-
load sensor harness terminal No.
p1
and body ground?
OK
ENG
Disconnect auto amp.
harness connector.
Note
Check circuit continuity
between auto amp. har-
ness terminal No.
p6
and sunload sensor har-
ness terminal No.
p1
and between auto amp.
harness terminal No.
p6and body ground.
OK
Disconnect auto amp. harness connec-
tor.
Replace auto amp.
Note
Check circuit continuity between sun-
load sensor harness terminal No.
p2
and auto amp. harness terminal No.
p5.
OK
CHECK SUNLOAD SENSOR.
(Refer to HA-86.)
OK
ENG
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. connectorSunload sensor
connector
H
HH
H
H
H
TROUBLE DIAGNOSESAUTO
HA-76