Infiniti F50. Manual — part 148
TROUBLE DIAGNOSIS
ATC-117
C
D
E
F
G
H
I
K
L
M
A
B
ATC
3.
CHECK INTAKE SENSOR
Refer to
.
OK or NG
OK
>> 1. Replace auto amp.
2. Go to self-diagnosis
ATC-54, "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-54, "FUNCTION CONFIRMATION PROCEDURE"
and perform self-
diagnosis STEP-2. Confirm that code No. 20 is displayed.
4.
CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND AUTO AMP.
1.
Turn ignition switch OFF.
2.
Disconnect auto amp. connector.
3.
Check continuity between intake sensor harness connector M90
terminal 32 (G/OR) and auto amp. harness connector M119 ter-
minal 1 (G/OR).
OK or NG
OK
>> 1. Replace auto amp.
2. Go to self-diagnosis
STEP-2. Confirm that code No. 20 is displayed.
NG
>> Repair harness or connector.
COMPONENT INSPECTION
Intake sensor
After disconnecting intake sensor harness connector, measure resis-
tance between terminals 32 and 36 at sensor harness side, using the
table below.
If NG, replace intake sensor.
32 – 1
: Continuity should exist.
RJIA0260E
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
RJIA1564E
ATC-118
TROUBLE DIAGNOSIS
Multiplex Communication Circuit
EJS0023R
DIAGNOSTIC PROCEDURE FOR MULTIPLEX COMMUNICATION CIRCUIT (FRONT CONTROL-
LER)
SYMPTOM:
●
A/C system does not come on.
●
A/C system cannot be controlled.
1.
CHECK FOR AUTO AMP. OUTPUT
1.
Turn ignition switch ON.
2.
Confirm multiplex communication signal using an oscilloscope.
OK or NG
OK
>> GO TO 2
NG
>> Replace auto amp.
Terminals
Voltage
(+)
(-)
Auto amp.
connector
Terminal No.
(wire color)
M119
9 (W)
Ground
20 (B)
RJIA1559E
RJIA0212E
HAK0363D
TROUBLE DIAGNOSIS
ATC-119
C
D
E
F
G
H
I
K
L
M
A
B
ATC
2.
CHECK CIRCUIT CONTINUITY BETWEEN AV AND NAVI CONTROL UNIT (AV CONTROL UNIT) AND
AUTO AMP.
1.
Turn ignition switch OFF.
2.
Disconnect AV and NAVI control unit (AV control unit) and auto amp. connector.
3.
Check continuity between AV and NAVI control unit harness connector B29 terminals 37(W), 39(B) or AV
control unit harness connector M77 terminals 44 (W), 45 (B) and auto amp. harness connector M119 ter-
minals 9 (W), 20 (B).
OK or NG
OK
>> GO TO 3.
NG
>> Repair harness or connector.
3.
CHECK FOR AUTO AMP. INPUT
1.
Reconnect AV and NAVI control unit (AV control unit) and auto
amp. connector.
2.
Turn ignition switch ON.
3.
Confirm multiplex communication signal using an oscilloscope.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 4.
Terminals
Continuity
AV control unit or
AV and NAVI
control unit con-
nector
Terminal No.
(Wire color)
Auto amp. con-
nector
Terminal No.
(Wire color)
AV control unit
M77
44 (W)
M119
9 (W)
Yes
M77
45 (B)
M119
20 (B)
AV and NAVI control unit
B29
37 (W)
M119
9 (W)
B29
39 (B)
M119
20 (B)
RJIA1312E
Terminals
Voltage
(+)
(-)
Auto amp.
connector
Terminal No.
(wire color)
M119
10 (R)
Ground
RJIA1560E
RJIA0213E
ATC-120
TROUBLE DIAGNOSIS
4.
CHECK CIRCUIT CONTINUITY BETWEEN AV AND NAVI CONTROL UNIT (AV CONTROL UNIT) AND
AUTO AMP.
1.
Turn ignition switch OFF.
2.
Disconnect AV and NAVI control unit (AV control unit) connector and auto amp. connector.
3.
Check continuity between AV and NAVI control unit harness connector B29 terminal 38 (R) or AV control
unit harness connector M77 terminal 43 (R) and auto amp. harness connector M119 terminal 10 (R).
OK or NG
OK
>> Replace auto amp.
NG
>> Repair harness or connector.
38 – 10
: Continuity should exist.
43 – 10
: Continuity should exist.
RJIA1313E
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