Infiniti I35 (A33). Manual — part 547
obstructing the sunlight does not cause any change in the A/C
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.
SHA715F
DIAGNOSTIC PROCEDURE
NHHA0223
SYMPTOM: Sunload sensor circuit is open or shorted. (
or
−
is indicated on the display as a result of conducting Self-
diagnosis STEP-2.)
1
CHECK SUNLOAD SENSOR CIRCUIT BETWEEN SUNLOAD SENSOR AND GROUND
Disconnect sunload sensor harness connector.
Do approx. 5 volts exist between sunload sensor harness connector M85 terminal No. 1 and ground?
RHA062GD
Yes or No
Yes
©
GO TO 2.
No
©
GO TO 4.
GI
MA
EM
LC
EC
FE
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Sunload Sensor Circuit (Cont’d)
HA-101
2
CHECK SUNLOAD SENSOR CIRCUIT BETWEEN SUNLOAD SENSOR AND AUTO AMP.
1. Disconnect auto amp. harness connector.
2. Check circuit continuity between sunload sensor harness connector M85 terminal No. 2 and auto amp. harness con-
nector M59 terminal No. 11.
RHA483GG
Continuity should exist.
If OK, check harness for short.
OK or NG
OK
©
GO TO 3.
NG
©
Repair harness or connector.
3
CHECK SUNLOAD SENSOR
Refer to HA-103.
OK or NG
OK
©
1. Replace auto amp.
2. Go to “FUNCTION CONFIRMATION PROCEDURE”, “Self-diagnosis”, HA-37 and per-
form self-diagnosis STEP-2.
Confirm that code No. 20 is displayed.
NG
©
1. Replace sunload sensor.
2. Go to “FUNCTION CONFIRMATION PROCEDURE”, “Self-diagnosis”, HA-37 and per-
form self-diagnosis STEP-2.
Confirm that code No. 20 is displayed.
TROUBLE DIAGNOSES
Sunload Sensor Circuit (Cont’d)
HA-102
4
CHECK SUNLOAD SENSOR CIRCUIT BETWEEN SUNLOAD SENSOR AND AUTO AMP.
1. Disconnect auto amp. harness connector.
2. Check circuit continuity between sunload sensor harness connector M85 terminal No. 1 and auto amp. harness con-
nector M59 terminal No. 12.
RHA484GE
Continuity should exist.
If OK, check harness for short.
OK or NG
OK
©
1. Replace auto amp.
2. Go to “FUNCTION CONFIRMATION PROCEDURE”, “Self-diagnosis”, HA-37 and per-
form self-diagnosis STEP-2.
Confirm that code No. 20 is displayed.
NG
©
Repair harness or connector.
RHA416H
COMPONENT INSPECTION
NHHA0224
Sunload Sensor
NHHA0224S01
Measure voltage between auto amp. terminal 12 and 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
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Sunload Sensor Circuit (Cont’d)
HA-103
SHA930E
RHA584E
Intake Sensor Circuit
COMPONENT DESCRIPTION
NHHA0225
Intake Sensor
NHHA0225S01
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
Sunload Sensor Circuit (Cont’d)
HA-104
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