Infiniti M35/M45 Y50. Manual — part 142
TROUBLE DIAGNOSIS
ATC-119
C
D
E
F
G
H
I
K
L
M
A
B
ATC
2.
CHECK CIRCUIT CONTINUITY BETWEEN SUNLOAD 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 sunload sensor harness connector
M87 terminal 2 and unified meter and A/C amp. harness con-
nector M65 terminal 62.
OK or NG
OK
>> GO TO 3.
NG
>> Repair harness or connector.
3.
CHECK SUNLOAD SENSOR
1.
Reconnect sunload sensor connector and unified meter and A/C amp. connector.
2.
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 sunload 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 SUNLOAD 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 sunload sensor harness connector
M87 terminal 1 and unified meter and A/C amp. harness con-
nector M65 terminal 46.
4.
Check continuity between sunload sensor harness connector
M87 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 – 62
: Continuity should exist.
RJIA4100E
1 – 46
: Continuity should exist.
1 – Ground
: Continuity should not exist.
RJIA4101E
ATC-120
TROUBLE DIAGNOSIS
COMPONENT INSPECTION
Sunload Sensor
Measure voltage between unified meter and A/C amp. harness con-
nector M65 terminal 46 and ground.
●
When checking sunload sensor, select a place where sunshine directly on it.
If NG, replace sunload sensor.
RJIA4102E
SHA930E
TROUBLE DIAGNOSIS
ATC-121
C
D
E
F
G
H
I
K
L
M
A
B
ATC
Intake Sensor Circuit
NJS000H3
COMPONENT DESCRIPTION
Intake Sensor
The intake sensor is located on the heater & cooling unit assembly. It
converts temperature of air after it passes through the evaporator
into a resistance value which is then input to the unified meter and A/
C amp.
DIAGNOSIS PROCEDURE FOR INTAKE SENSOR
SYMPTOM: Intake sensor circuit is open or shorted. (24 or
−
24 is
indicated on unified meter and A/C amp. as a result of performing
self-diagnosis STEP-2.)
1.
CHECK VOLTAGE BETWEEN INTAKE SENSOR AND GROUND
1.
Disconnect intake sensor connector.
2.
Turn ignition switch ON.
3.
Check voltage between intake sensor harness connector M82
terminal 1 and ground.
OK or NG
OK
>> GO TO 2.
NG
>> GO TO 4.
2.
CHECK CIRCUIT CONTINUITY BETWEEN INTAKE 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 intake sensor harness connector M82
terminal 2 and unified meter and A/C amp. harness connector
M65 terminal 59.
OK or NG
OK
>> GO TO 3.
NG
>> Repair harness or connector.
RJIA4103E
RJIA4104E
1 – Ground
: Approx. 5 V
RJIA4215E
2 – 59
: Continuity should exist.
RJIA4106E
ATC-122
TROUBLE DIAGNOSIS
3.
CHECK INTAKE 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 intake 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 INTAKE 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 intake sensor harness connector M82
terminal 1 and unified meter and A/C amp. harness connector
M65 terminal 43.
4.
Check continuity between intake sensor harness connector M82
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.
COMPONENT INSPECTION
Intake Sensor
After disconnecting intake sensor connector M82, measure resis-
tance between terminals 1 and 2 at sensor side. Refer to the table
below.
If NG, replace intake sensor.
1 – 43
: Continuity should exist.
1 – Ground
: Continuity should not exist.
RJIA4105E
Temperature
°
C (
°
F)
Resistance k
Ω
−
15 (5)
12.34
−
10 (14)
9.62
−
5 (23)
7.56
0 (32)
6.00
5 (41)
4.80
10 (50)
3.87
15 (59)
3.15
20 (68)
2.57
25 (77)
2.12
30 (86)
1.76
35 (95)
1.47
40 (104)
1.23
45 (113)
1.04
RJIA4107E
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