Infiniti G20 (P11). Manual — part 442
Temperature °C (°F)
Resistance k
Ω
35 (95)
1.51
40 (104)
1.27
45 (113)
1.07
If NG, replace in-vehicle sensor.
RHA077H
Sunload Sensor Circuit
COMPONENT DESCRIPTION
NCHA0046
The sunload sensor is located on the right defroster grille. It detects
sunload entering through windshield by means of a photo diode.
The sensor converts the sunload into a current value which is then
input into the auto amplifier.
SUNLOAD INPUT PROCESS
NCHA0047
The auto amp. also includes a processing circuit which “average”
the variations in detected sunload over a period of time. This pre-
vents drastic swings in the ATC system operation due to small or
quick variations in detected sunload.
For example, consider driving along a road bordered by an occa-
sional group of large trees. The sunload detected by the sunload
sensor will vary whenever the trees obstruct the sunlight. The pro-
cessing circuit averages the detected sunload over a period of
time, so that the (insignificant) effect of the trees momentarily
obstructing the sunlight does not cause any change in the ATC
system operation. On the other hand, shortly after entering a long
tunnel, the system will recognize the change in sunload, and the
system will react accordingly.
RHA061GA
DIAGNOSTIC PROCEDURE
NCHA0048
SYMPTOM: Sunload sensor circuit is open or shorted. (
or
−
is indicated on auto amp. as a result of conducting Self-
diagnosis STEP 2.)
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
AUTO
In-vehicle Sensor Circuit (Cont’d)
HA-99
1
CHECK SUNLOAD SENSOR CIRCUIT BETWEEN SUNLOAD SENSOR AND BODY GROUND
Disconnect sunload sensor harness connector.
Do approx. 5 volts exist between sunload sensor harness terminal No. 1 and body ground?
RHA062GC
Yes or No
Yes
©
GO TO 2.
No
©
GO TO 4.
2
CHECK SUNLOAD SENSOR CIRCUIT BETWEEN SUNLOAD SENSOR AND AUTO AMP. (LCU)
1. Disconnect auto amp. (LCU) harness connector.
2. Check circuit continuity between sunload sensor harness terminal No. 2 and auto amp. (LCU) harness terminal No. 11.
Continuity should exist.
RHA483GB
OK or NG
OK
©
GO TO 3.
NG
©
Repair harness or connector.
3
CHECK SUNLOAD SENSOR.
Refer to HA-101.
OK or NG
OK
©
1. Replace auto amp. (LCU).
2. Go to self-diagnosis step-by-step procedure (HA-32) and perform self-diagnosis
STEP-2.
Confirm that code No. 20 is displayed.
NG
©
1. Replace sunload sensor.
2. Go to self-diagnosis step-by-step procedure (HA-32) and perform self-diagnosis
STEP-2.
Confirm that code No. 20 is displayed.
TROUBLE DIAGNOSES
AUTO
Sunload Sensor Circuit (Cont’d)
HA-100
4
CHECK SUNLOAD SENSOR CIRCUIT BETWEEN SUNLOAD SENSOR AND AUTO AMP. (LCU)
1. Disconnect auto amp. (LCU) harness connector.
2. Check circuit continuity between sunload sensor harness terminal No. 1 and auto amp. (LCU) harness terminal No. 12.
Continuity should exist.
RHA484GB
OK or NG
OK
©
1. Replace auto amp.
2. Go to self-diagnosis step-by-step procedure (HA-32) and perform self-diagnosis
STEP-2.
Confirm that code No. 20 is displayed.
NG
©
Repair harness or connector.
RHA078HB
ELECTRICAL COMPONENT INSPECTION
NCHA0049
Sunload Sensor
NCHA0049S01
Measure voltage between auto amp. terminal 12 and body ground.
If NG, replace sunload sensor.
I
When checking sunload sensor, select a place where sun
shines directly on it.
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
AUTO
Sunload Sensor Circuit (Cont’d)
HA-101
SHA930E
RHA079H
Intake Sensor Circuit
COMPONENT DESCRIPTION
NCHA0105
Intake Sensor
NCHA0105S01
The intake sensor is located on the cooling unit. It converts tem-
perature of air after it passes through the evaporator into a resis-
tance value which is then input to the auto amp.
After disconnecting intake sensor harness connector, measure
resistance between terminals 1 and 2 at sensor harness side, using
the table below.
Temperature °C (°F)
Resistance k
Ω
−15 (5)
12.73
−10 (14)
9.92
−5 (23)
7.80
0 (32)
6.19
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
45 (113)
1.07
If NG, replace intake sensor.
TROUBLE DIAGNOSES
AUTO
Sunload Sensor Circuit (Cont’d)
HA-102
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