Infiniti M35/M45 Y50. Manual — part 140
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TROUBLE DIAGNOSIS
ATC-111
C
D
E
F
G
H
I
K
L
M
A
B
ATC
Memory Function
NJS000GZ
SYMPTOM: Memory function does not operate.
INSPECTION FLOW
*1
ATC-67, "Power Supply and Ground
Circuit for Auto Amp."
*2
*3
ATC-57, "FUNCTION CONFIRMA-
TION PROCEDURE"
RJIA4086E
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ATC-112
TROUBLE DIAGNOSIS
Ambient Sensor Circuit
NJS000H0
COMPONENT DESCRIPTION
Ambient Sensor
The ambient sensor is attached on the radiator core support (left
side). It detects ambient temperature and converts it into a resis-
tance value which is then input into the unified meter and A/C amp.
AMBIENT TEMPERATURE INPUT PROCESS
The unified meter and A/C amp. includes a processing circuit for the ambient sensor input. However, when the
temperature detected by the ambient sensor increases quickly, the processing circuit retards the unified meter
and A/C amp. function. It only allows the unified meter and A/C amp. to recognize an ambient temperature
increase of 0.33
°
C (0.6
°
F) per 100 seconds.
As an example, consider stopping for a few minutes after high speed driving. Although the actual ambient tem-
perature 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 bumper area, location of the ambient sensor.
DIAGNOSIS PROCEDURE FOR AMBIENT SENSOR
SYMPTOM: Ambient sensor circuit is open or shorted. (21 or
−
21 is
indicated on unified meter and A/C amp. as a result of performing
self-diagnosis STEP-2.)
1.
CHECK VOLTAGE BETWEEN AMBIENT SENSOR AND GROUND
1.
Disconnect ambient sensor connector.
2.
Turn ignition switch ON.
3.
Check voltage between ambient sensor harness connector E62
terminal 1 and ground.
OK or NG
OK
>> GO TO 2.
NG
>> GO TO 4.
RJIA4087E
RJIA4088E
1 – Ground
: Approx. 5 V
RJIA2017E
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TROUBLE DIAGNOSIS
ATC-113
C
D
E
F
G
H
I
K
L
M
A
B
ATC
2.
CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT SENSOR AND UNIFIED METER AND A/C AMP.
1.
Turn ignition switch OFF.
2.
Disconnect unified meter and A/C amp. connector.
3.
Check continuity between ambient sensor harness connector
E62 terminal 2 and unified meter and A/C amp. harness connec-
tor M65 terminal 61.
OK or NG
OK
>> GO TO 3.
NG
>> Repair harness or connector.
3.
CHECK AMBIENT SENSOR
Refer to
OK or NG
OK
>> 1. Replace unified meter and A/C amp.
2. Go to self-diagnosis
ATC-57, "FUNCTION CONFIRMATION PROCEDURE"
and perform self-
diagnosis STEP-2. Confirm that code No. 20 is displayed.
NG
>> 1. Replace ambient sensor.
2. Go to self-diagnosis
ATC-57, "FUNCTION CONFIRMATION PROCEDURE"
and perform self-
diagnosis STEP-2. Confirm that code No. 20 is displayed.
4.
CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT SENSOR AND UNIFIED METER AND A/C AMP.
1.
Turn ignition switch OFF.
2.
Disconnect unified meter and A/C amp. connector.
3.
Check continuity between ambient sensor harness connector
E62 terminal 1 and unified meter and A/C amp. harness connec-
tor M65 terminal 45.
4.
Check continuity between ambient sensor harness connector
E62 terminal 1 and ground.
OK or NG
OK
>> 1. Replace unified meter and A/C amp.
2. Go to self-diagnosis
ATC-57, "FUNCTION CONFIRMATION PROCEDURE"
and perform self-
diagnosis STEP-2. Confirm that code No. 20 is displayed.
NG
>> Repair harness or connector.
2 – 61
: Continuity should exist.
RJIA4089E
1 – 45
: Continuity should exist.
1 – Ground
: Continuity should not exist.
RJIA4090E
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ATC-114
TROUBLE DIAGNOSIS
COMPONENT INSPECTION
Ambient Sensor
After disconnecting ambient sensor connector E62, measure resis-
tance between terminals 1 and 2 at sensor side. Refer to the table
below.
If NG, replace ambient sensor.
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
RJIA4091E
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