Infiniti Q45. Manual — part 16
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
ACS-57
[ICC]
C
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ACS
2.
CHECK STOP LAMP SWITCH AND ICC BRAKE SWITCH
With CONSULT-II
With “ICC” “DATA MONITOR”, check that “STOP LAMP SW” and “BRAKE SW” operate normally. Refer to
OK or NG
OK
>> GO TO 12.
NG
>>
●
BRAKE SW: GO TO 3.
●
STOP LAMP SW: GO TO 9.
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 AND STOP LAMP SWITCH
Check ICC brake switch and stop lamp switch. Refer to
ACS-78, "ICC Brake Switch and Stop Lamp Switch"
.
OK or NG
OK
>> GO TO 5.
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 ICC BRAKE HOLD RELAY
1.
Turn ignition switch OFF.
2.
Disconnect ICC brake hold relay.
3.
Check ICC brake hold relay. Refer to
ACS-78, "ICC BRAKE HOLD RELAY"
OK or NG
OK
>> GO TO 6.
NG
>> 1. Replace ICC brake hold relay.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system
again.
ACS-58
[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
6.
CHECK HARNESS BETWEEN ICC BRAKE HOLD RELAY AND ICC BRAKE SWITCH
1.
Disconnect ICC brake switch connector and ICC unit connector.
2.
Check continuity between ICC brake hold relay harness connec-
tor and ICC brake switch harness connector.
3.
Check continuity between ICC brake hold relay harness connec-
tor and ground.
OK or NG
OK
>> GO TO 7.
NG
>> 1. Repair harness between ICC brake hold relay and ICC brake switch.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system
again.
7.
CHECK HARNESS BETWEEN ICC UNIT AND ICC BRAKE HOLD RELAY
1.
Check continuity between ICC unit harness connector and ICC
brake hold relay harness connector.
2.
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.
ICC brake hold
relay connector
Terminal
ICC brake switch
connector
Terminal
Continuity
E38
3
M404
1
Yes
ICC brake hold
relay connector
Terminal
Ground
Continuity
E38
3
No
PKIA9909E
ICC unit connector
Terminal
ICC brake hold relay
connector
Terminal
Continuity
B244
47
E38
1
Yes
ICC unit connector
Terminal
Ground
Continuity
B244
47
No
SKIA1272E
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
ACS-59
[ICC]
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ACS
8.
CHECK ICC BRAKE HOLD RELAY POWER SUPPLY CIRCUIT
1.
Turn ignition switch ON.
2.
Check voltage between ICC brake hold relay 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 or replace harness or fuse.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system
again.
9.
CHECK BRAKE LAMP ILLUMINATION
1.
Turn ignition switch OFF.
2.
Disconnect ICC brake hold relay connector.
3.
Check stop lamp circuit.
OK or NG
OK
>> GO TO 10.
NG
>> After repairing, erase DTC and perform ICC system running test. Then perform self-diagnosis of
ICC system again.
10.
CHECK ICC BRAKE HOLD RELAY CIRCUIT
1.
Connect ICC brake hold relay connector.
2.
Disconnect stop lamp switch connector.
3.
When brake pedal is not depressed, make sure that stop lamp does not illuminate.
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
>> GO TO 11.
11.
CHECK ICC BRAKE HOLD RELAY
1.
Disconnect ICC brake hold relay.
2.
Check ICC brake hold relay. Refer to
ACS-78, "ICC BRAKE HOLD RELAY"
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 hold relay.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system
again.
Terminals
Voltage (Approx.)
(+)
(
−
)
ICC brake hold
relay connector
Terminal
E38
4
Ground
Battery voltage
SKIA1194E
ACS-60
[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
12.
CHECK HARNESS BETWEEN ICC UNIT AND ICC BRAKE HOLD RELAY
1.
Turn ignition switch OFF.
2.
Disconnect ICC unit connector and ICC brake hold relay.
3.
Check continuity between ICC unit harness connector and ICC
brake hold relay harness connector.
4.
Check continuity between ICC unit harness connector and
ground.
OK or NG
OK
>> GO TO 13.
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.
13.
CHECK ICC BRAKE HOLD RELAY GROUND CIRCUIT
Check continuity between ICC brake hold relay harness connector
and ground.
OK or NG
OK
>> GO TO 14.
NG
>> 1. Repair harness between ICC brake hold relay and
ground.
2. Erase DTC and perform ICC system running test.
Then perform self-diagnosis of ICC system again.
14.
CHECK ICC BRAKE HOLD RELAY
Check ICC brake hold relay. Refer to
ACS-78, "ICC BRAKE HOLD RELAY"
OK or NG
OK
>> GO TO 15.
NG
>> 1. Replace ICC brake hold relay.
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
47
E38
1
Yes
ICC unit connector
Terminal
Ground
Continuity
B244
47
No
SKIA6660E
ICC brake hold
relay connector
Terminal
Ground
Continuity
E38
2
Yes
SKIA6661E
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