Infiniti Q45. Manual — part 14
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
ACS-49
[ICC]
C
D
E
F
G
H
I
J
L
M
A
B
ACS
7.
CHECK ICC BRAKE HOLD RELAY CIRCUIT
1.
Disconnect ICC unit connector and stop lamp switch connector.
2.
Check continuity between ICC unit harness connector and ICC
brake hold relay harness connector.
3.
Check continuity between ICC unit harness connector and
ground.
OK or NG
OK
>> GO TO 8.
NG
>> 1. Repair harness between ICC unit and ICC brake hold relay.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system
again.
8.
CHECK STOP LAMP SWITCH CIRCUIT
Check continuity between ICC unit harness connector and stop lamp
switch harness connector.
OK or NG
OK
>> 1. Replace ICC unit.
2. Erase DTC and perform ICC system running test.
Then perform self-diagnosis of ICC system again.
NG
>> 1. Repair harness between ICC unit and stop lamp
switch.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system
again.
DTC 46 OPERATION SW CIRC
NKS001KL
1.
CHECK CONNECTOR FOR ECM
1.
Turn ignition switch OFF.
2.
Disconnect ECM connector, and connect it securely again.
3.
Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system again.
Is malfunction indicated?
YES
>> GO TO 2.
NO
>> Poor connector connection
1. Check connector. (Check connector housing for disconnected, loose, bent, and collapsed ter-
minals. If any malfunction is detected, repair applicable part.)
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system
again.
ICC unit connector
Terminal
ICC brake hold
relay connector
Terminal
Continuity
B244
38
E38
7
Yes
ICC unit connector
Terminal
Ground
Continuity
B244
38
No
PKIA9907E
ICC unit connector
Terminal
Stop lamp switch
connector
Terminal
Continuity
B244
38
M402
4
Yes
PKIA9911E
ACS-50
[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
2.
CHECK ICC STEERING SWITCH
Check ICC steering switch. Refer to
.
OK or NG
OK
>> GO TO 3.
NG
>> 1. Replace ICC steering switch.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system
again.
3.
CHECK HARNESS BETWEEN SPIRAL CABLE AND ECM
1.
Turn ignition switch OFF.
2.
Disconnect ECM connector and spiral cable connector.
3.
Check continuity between spiral cable harness connector and
ECM harness connector.
4.
Check continuity between spiral cable harness connector and
ground.
OK or NG
OK
>> GO TO 4.
NG
>> 1. Repair harness between spiral cable and ECM.
2. Erase DTC and perform ICC system running test.
Then perform self-diagnosis of ICC system again.
4.
CHECK COMBINATION SWITCH (SPIRAL CABLE)
Check continuity between spiral cable (on vehicle) and spiral cable
(on switch).
OK or NG
OK
>> GO TO 5.
NG
>> 1. Replace spiral cable.
2. Erase DTC and perform ICC system running test.
Then perform self-diagnosis of ICC system again.
Spiral cable
connector
Terminal
ECM connector
Terminal
Continuity
M53
31
F101
67
Yes
26
99
PKIA9822E
Spiral cable
connector
Terminal
Ground
Continuity
M53
31
No
26
PKIB1442E
Terminal
Terminal
Continuity
26
18
Yes
31
17
PKIA9823E
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
ACS-51
[ICC]
C
D
E
F
G
H
I
J
L
M
A
B
ACS
5.
CHECK HARNESS BETWEEN SPIRAL CABLE AND ICC STEERING SWITCH
1.
Check continuity between spiral cable harness connector and
ICC steering switch harness connector.
2.
Check continuity between spiral cable harness connector and
ground.
OK or NG
OK
>> 1. Perform ECM self-diagnosis.
2. After repairing or replacing applicable item, erase
DTC and perform ICC system running test. Then per-
form self-diagnosis of ICC system again.
NG
>> 1. Replace driver air bag module.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system
again.
DTC 61 PRESS SEN CIRCUIT
NKS001KM
1.
CHECK BRAKE PRESSURE SENSOR AND ICC UNIT CONNECTORS
1.
Turn ignition switch OFF.
2.
Disconnect brake pressure sensor connector and ICC unit connector, and connect them securely again.
3.
Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system again.
Is malfunction indicated?
YES
>> GO TO 2.
NO
>> Poor connector connection
1. Check connector. (Check connector housing for disconnected, loose, bent, and collapsed ter-
minals. If any malfunction is detected, repair applicable part.)
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system
again.
Spiral cable
connector
Terminal
ICC steering switch
connector
Terminal
Continuity
M441
18
M443
1
Yes
17
2
PKIA9955E
Spiral cable
connector
Terminal
Ground
Continuity
M441
18
No
17
PKIB1443E
ACS-52
[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
2.
CHECK HARNESS BETWEEN BRAKE PRESSURE SENSOR AND ICC UNIT
1.
Turn ignition switch OFF.
2.
Disconnect ICC unit connector and brake pressure sensor con-
nector.
3.
Check continuity between brake pressure sensor harness con-
nector and ICC unit harness connector.
4.
Check continuity between ICC unit harness connector and
ground.
OK or NG
OK
>> GO TO 3.
NG
>> 1. Repair harness between brake pressure sensor and
ICC unit.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system
again.
3.
CHECK POWER SUPPLY CIRCUIT FOR BRAKE PRESSURE SENSOR
1.
Connect ICC unit connector.
2.
Turn ignition switch ON.
3.
Check voltage between ICC unit connector terminals.
OK or NG
OK
>> 1. Replace brake pressure sensor. Refer to
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system
again.
NG
>> 1. Replace ICC unit.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system
again.
Brake pressure
sensor connector
Terminal
ICC unit
connector
Terminal
Continuity
E82
1
B243
24
Yes
2
17
3
8
ICC unit connector
Terminal
Ground
Continuity
B243
8
No
17
24
SKIA6652E
PKIB1444E
ICC unit connector
Terminal
Voltage (Approx.)
(+)
(
−
)
B243
8
24
5 V
SKIA6653E
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