Infiniti Q45. Manual — part 13
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
ACS-45
[ICC]
C
D
E
F
G
H
I
J
L
M
A
B
ACS
DTC 20 CAN COMM CIRCUIT
NKS001KG
1.
CHECK CAN COMMUNICATION
With CONSULT-II
1.
Perform self-diagnosis.
2.
Print self-diagnostic result.
>> After printing self-diagnostic result, go to “CAN system”. Refer to
DTC 31 POWER SUPPLY CIR, DTC 34 POWER SUPPLY CIR 2
NKS001KH
1.
CHECK CONNECTOR FOR ICC UNIT
1.
Turn ignition switch OFF.
2.
Disconnect ICC unit 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.
2.
CHECK POWER SUPPLY CIRCUIT FOR ICC UNIT
1.
Turn ignition switch ON.
2.
Check voltage between ICC unit harness connector and ground.
OK or NG
OK
>> GO TO 3.
NG
>> 1. Repair ICC unit power supply harness or fuse.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system
again.
Terminals
Voltage (Approx.)
(+)
(
−
)
ICC unit connector
Terminal
B244
33
Ground
Battery voltage
42
SKIA1173E
ACS-46
[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
3.
CHECK GROUND CIRCUIT FOR ICC UNIT
1.
Turn ignition switch OFF.
2.
Disconnect ICC unit connector.
3.
Check continuity between ICC unit harness connector and
ground.
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 ICC unit ground harness.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system
again.
DTC 41 VHCL SPEED SE CIRC
NKS001KI
1.
PERFORM ICC UNIT SELF-DIAGNOSIS
1.
Perform self-diagnosis.
2.
Check if “DTC 43 ABS/TCS/VDC CIRC” or “DTC 20 CAN COMM CIRCUIT” other than “DTC 41 VHCL
SPEED SE CIRC” is indicated in self-diagnosis item in the display.
Is any indicated?
YES
>> 1. Repair or replace applicable item.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system
again.
NO
>> GO TO 2.
2.
CHECK AT VEHICLE SPEED SENSOR
With CONSULT-II
With “ICC” “DATA MONITOR”, check if “VHCL SPD AT” operates normally. Refer to
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. Perform “A/T” self-diagnosis.
2. After repairing or replacing applicable item, erase DTC and perform ICC system running test.
Then perform self-diagnosis of ICC system again.
ICC unit con-
nector
Terminal
Ground
Continuity
B243
19
Yes
20
B244
46
SKIA6650E
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
ACS-47
[ICC]
C
D
E
F
G
H
I
J
L
M
A
B
ACS
DTC 43 ABS/TCS/VDC CIRC
NKS001KJ
1.
PERFORM ICC UNIT SELF-DIAGNOSIS
With CONSULT-II
1.
Perform self-diagnosis.
2.
Check if “DTC 20 CAN COMM CIRCUIT” other than “DTC 43 ABS/TCS/VDC CIRC” is indicated in self-
diagnosis item in the display.
Is it indicated?
YES
>> 1. Repair or replace applicable item.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system
again.
NO
>> GO TO 2.
2.
PERFORM VDC/TCS/ABS CONTROL UNIT SELF-DIAGNOSIS
With CONSULT-II
1.
Perform self-diagnosis of VDC/TCS/ABS control unit. Refer to
.
2.
Check if malfunction is indicated.
Is malfunction indicated?
YES
>> 1. Repair or replace applicable item.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system
again.
NO
>> 1. Replace ICC unit.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system
again.
DTC 45 BRAKE SW/STOP L SW
NKS001KK
1.
CHECK CONNECTOR FOR ICC UNIT
1.
Turn ignition switch OFF.
2.
Disconnect ICC unit 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.
2.
CHECK STOP LAMP SWITCH AND ICC BRAKE SWITCH
With CONSULT-II
With “ICC” “DATA MONITOR”, check if “STOP LAMP SW” and “BRAKE SW” are operated normally. Refer to
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
>>
●
BRAKE SW: GO TO 3.
●
STOP LAMP SW: GO TO 5.
ACS-48
[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
3.
CHECK BRAKE SWITCH INSTALLATION AND ADJUSTMENT
Check ICC brake switch for proper installation, and adjust the switch if necessary. Refer to
OK or NG
OK
>> GO TO 4.
NG
>> After adjustment, erase DTC and perform ICC system running test. Then perform self-diagnosis
of ICC system again.
4.
CHECK ICC BRAKE SWITCH
Check ICC brake switch. Refer to
ACS-78, "ICC Brake Switch and Stop Lamp Switch"
.
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. Replace ICC brake switch.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system
again.
5.
CHECK STOP LAMP ILLUMINATION
Check stop lamp illumination.
OK or NG
OK
>> GO TO 6.
NG
>> 1. Check stop lamp circuit.
2. After repairing, erase DTC and perform ICC system running test. Then perform self-diagnosis
of ICC system again.
6.
CHECK ICC BRAKE HOLD RELAY
1.
Turn ignition switch OFF.
2.
Remove ICC brake hold relay.
3.
Check ICC brake hold relay. Refer to
ACS-78, "ICC BRAKE HOLD RELAY"
OK or NG
OK
>> GO TO 7.
NG
>> 1. Replace brake hold relay.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system
again.
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