Infiniti G20 (P11). Manual — part 441
RHA073HB
ELECTRICAL COMPONENT INSPECTION
NCHA0042
Ambient Sensor
NCHA0042S01
After disconnecting ambient sensor harness connector, measure
resistance between terminals 2 and 1 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 ambient sensor.
RHA074H
In-vehicle Sensor Circuit
COMPONENT DESCRIPTION
NCHA0043
In-vehicle sensor
NCHA0043S01
The in-vehicle sensor is located on instrument lower panel. It con-
verts variations in temperature of compartment air drawn from the
aspirator into a resistance value. It is then input into the auto
amplifier.
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
AUTO
Ambient Sensor Circuit (Cont’d)
HA-95
RHA636F
RHA482A
Aspirator
NCHA0043S02
The aspirator is located in front of heater unit. It produces vacuum
pressure due to air discharged from the heater unit, continuously
taking compartment air in the aspirator.
RHA056GB
DIAGNOSTIC PROCEDURE
NCHA0044
SYMPTOM: In-vehicle sensor circuit is open or shorted. (
or
−
is indicated on auto amp. as a result of conducting Self-
diagnosis STEP 2.)
1
CHECK IN-VEHICLE SENSOR CIRCUIT BETWEEN IN-VEHICLE SENSOR AND BODY GROUND
Disconnect in-vehicle sensor harness connector.
Do approx. 5 volts exist between in-vehicle sensor harness terminal No. 1 and body ground?
RHA075H
Yes or No
Yes
©
GO TO 2.
No
©
GO TO 4.
TROUBLE DIAGNOSES
AUTO
In-vehicle Sensor Circuit (Cont’d)
HA-96
2
CHECK IN-VEHICLE SENSOR CIRCUIT BETWEEN IN-VEHICLE SENSOR AND AUTO AMP. (LCU)
1. Disconnect auto amp. (LCU) harness connector.
2. Check circuit continuity between in-vehicle sensor harness terminal No. 2 and auto amp. (LCU) harness terminal No.
11.
Continuity should exist.
RHA478GB
OK or NG
OK
©
GO TO 3.
NG
©
Repair harness or connector.
3
CHECK IN-VEHICLE SENSOR
Refer to HA-98.
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
©
1. Replace in-vehicle 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.
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-97
4
CHECK IN-VEHICLE SENSOR CIRCUIT BETWEEN AMBIENT SENSOR AND AUTO AMP. (LCU)
1. Disconnect auto amp. (LCU) harness connector.
2. Check circuit continuity between in-vehicle sensor harness terminal No. 1 and auto amp. (LCU) harness terminal No. 3.
Continuity should exist.
RHA479GB
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
©
Repair harness or connector.
RHA076HB
ELECTRICAL COMPONENT INSPECTION
NCHA0045
In-vehicle Sensor
NCHA0045S01
After disconnecting in-vehicle 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
TROUBLE DIAGNOSES
AUTO
In-vehicle Sensor Circuit (Cont’d)
HA-98
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