1999 NISSAN PICK-UP Repair Manual

Noise
TROUBLE DIAGNOSIS PROCEDURE FOR NOISE
SYMPTOM:
lNoise
Inspection flow
*1: HA-69 in D22 Service
Manual, Publication No.
SM8E-0D22E0E*2: HA-71 in D22 Service
Manual, Publication No.
SM8E-0D22E0E*3: HA-57 in D22 Service
Manual, Publication No.
SM8E-0D22E0E
*4: HA-2041
RHA539H
TROUBLE DIAGNOSESAUTO
HA-2077

Self-diagnosis
TROUBLE DIAGNOSIS PROCEDURE FOR SELF-DIAGNOSIS
SYMPTOM:
lSelf-diagnosis cannot be performed.
Inspection flow
*1: HA-2046
*2: HA-2081
*3: HA-2083*4: HA-2085
*5: HA-2087
*6: HA-2055*7: HA-2041
*8: HA-2040
SHA352F
TROUBLE DIAGNOSESAUTO
HA-2078

Memory Function
TROUBLE DIAGNOSIS PROCEDURE FOR MEMORY FUNCTION
SYMPTOM:
lMemory function does not operate.
Inspection flow
*1: HA-2046 *2: HA-2041 *3: HA-2035
SHA027F
TROUBLE DIAGNOSESAUTO
HA-2079

Ambient Sensor
COMPONENT DESCRIPTION
The ambient sensor is attached in front of the driver's side con-
denser. It detects ambient temperature and converts it into a
resistance value which is then input into the auto amplifier.
AMBIENT TEMPERATURE INPUT PROCESS
The automatic amplifier includes a ªprocessing circuitº for the
ambient sensor input. However, when the temperature detected
by the ambient sensor increases quickly, the processing circuit
retards the auto amp. function. It only allows the auto amp. to
recognize an ambient temperature increase of 0.33ÉC per 100
seconds.
As an example, consider stopping for a cup of coffee after high
speed driving. Although the actual ambient temperature has not
changed, the temperature detected by the ambient sensor will
increase. This is because the heat from the engine compartment
can radiate to the front grille area, location of the ambient sen-
sor.
RHA036H
TROUBLE DIAGNOSESAUTO
HA-2080

DIAGNOSTIC PROCEDURE
SYMPTOM: Ambient sensor circuit is open or shorted.
(
orA/C LEDis indicated on auto amp. as a result of
conducting Self-diagnosis STEP 2.)
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.
V2and body
ground?
Yes
cNo
Disconnect auto amp. har-
ness connector.
Note
Check circuit continuity
between ambient sensor
harness terminal No.
V2
and auto amp. harness
terminal No.
V9.
OK
Disconnect auto amp. harness connector.
Replace auto amp.
Note
Check circuit continuity between ambient
sensor harness terminal No.
V1and auto
amp. harness terminal No.
V24.
OK
CHECK AMBIENT SENSOR.
(Refer to HA-2082.)
OK
cNG
Replace ambient sensor.
Replace auto amp.
Note:
If the result is NG or No after checking circuit continuity, repair harness
or connector.
RHA051GC
RHA499H
RHA500H
RHA501H
.
..
.
.
.
TROUBLE DIAGNOSESAUTO
Ambient Sensor (Cont'd)
HA-2081

COMPONENT INSPECTION
Ambient sensor
After disconnecting ambient sensor harness connector, measure
resistance between terminals
V1andV2at sensor harness side,
using the table below.
Temperature ÉC (ÉF) Resistance kW
þ20 (þ4) 9.98
þ10 (14) 5.57
0 (32) 3.26
10 (50) 1.98
20 (68) 1.25
25 (77) 1.00
30 (86) 0.81
40 (104) 0.54
In-vehicle Sensor
COMPONENT DESCRIPTION
The in-vehicle sensor is located on instrument lower panel. It
converts variations in temperature of compartment air drawn
from the aspirator. It is then input into the auto amplifier.
SHA353F
RHA502H
TROUBLE DIAGNOSESAUTO
Ambient Sensor (Cont'd)
HA-2082

DIAGNOSTIC PROCEDURE
SYMPTOM: In-vehicle sensor circuit is open or shorted.
(
orA/C LEDis indicated on auto amp. as a result of
conducting Self-diagnosis STEP 2.)
CHECK IN-VEHICLE SENSOR CIRCUIT
BETWEEN IN-VEHICLE SENSOR AND
AUTO AMP.
Disconnect in-vehicle sensor harness
connector.
Do approx. 5 volts exist between in-ve-
hicle sensor harness terminal No.
V1and
body ground?
Yes
cNo
Disconnect auto amp. har-
ness connector.
Note
Check circuit continuity
between in-vehicle sensor
harness terminal No.
V1
and auto amp. harness
terminal No.
V8.
OK
Disconnect auto amp. harness connector.
Replace auto amp.
Note
Check circuit continuity between in-ve-
hicle sensor harness terminal No.
V2and
auto amp. harness terminal No.
V24.
OK
CHECK IN-VEHICLE SENSOR.
(Refer to HA-2084.)
OK
cNG
Replace in-vehicle sensor.
Replace auto amp.
Note:
If the result is NG or No after checking circuit continuity, repair harness
or connector.
RHA056GE
RHA504H
RHA505H
RHA506H
.
..
.
.
.
TROUBLE DIAGNOSESAUTO
In-vehicle Sensor (Cont'd)
HA-2083

COMPONENT INSPECTION
In-vehicle sensor
After disconnecting in-vehicle sensor harness connector, mea-
sure resistance between terminals
V1andV2at sensor harness
side, using the table below.
Temperature ÉC (ÉF) Resistance kW
0 (32) 6.0
5 (41) 4.95
10 (50) 3.99
15 (59) 3.24
20 (68) 2.65
25 (77) 2.19
30 (86) 1.81
35 (95) 1.51
40 (104) 1.27
Aspirator Motor
COMPONENT DESCRIPTION
The aspirator motor is located in front of the heater unit. The
aspirator motor continuously draws compartment air into the in-
vehicle sensor while the ignition switch is ON.
Check that smoke is properly sucked into in-vehicle sensor when
a lighted cigarette is moved close to the sensor.
Sunload Sensor
COMPONENT DESCRIPTION
The sunload sensor is located on the center defroster grille. It
detects sunload entering through the windshield by means of a
photo diode and converts it into a current value which is then
input to the auto amplifier.
RHA503H
RHA019H
RHA021H
TROUBLE DIAGNOSESAUTO
In-vehicle Sensor (Cont'd)
HA-2084