Infiniti F50. Manual - part 20

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

ACS-73

[ICC]

C

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B

ACS

4. 

CHECK HARNESS BETWEEN ICC UNIT AND ECM

1.

Turn ignition switch OFF.

2.

Disconnect harness connectors of ICC unit and ECM.

3.

Check continuity between ICC unit harness connector B245 ter-
minal 69 (R/Y) and ECM harness connector F102 terminal 113
(R/Y).

4.

Check continuity between ICC unit harness connector B245 ter-
minal 69 (R/Y) and ground.

OK or NG

OK

>>

●

Check ECM.

●

After repair, erase DTC and perform ICC system running test. Then, perform self-diagnosis of
ICC system again.

NG

>>

●

Repair harness between ICC unit and ECM

●

After repair, erase DTC, and perform ICC system running test. Then perform self-diagnosis of
ICC system again.

5. 

DIAGNOSIS CHECK 1

 With CONSULT-II

●

Perform self-diagnosis. Is “CAN COMM CIRCUIT” indicated?

Yes or No

Yes

>> Repair or replace applicable item. Erase DTC and perform ICC system running test. Then perform

self-diagnosis of ICC system again.

No

>> GO TO 6.

6. 

DIAGNOSIS CHECK 2

 With CONSULT-II

●

Perform self-diagnosis of ECM with CONSULT-II. Is malfunction indicated?

Yes or No

Yes

>> Repair or replace applicable item. Erase DTC and perform ICC system running test. Then perform

self-diagnosis of ICC system again.

No

>> Replace ICC unit. Erase DTC and perform ICC system running test. Then perform self-diagnosis

of ICC system again.

DTC 43 ABS/TCS/VDC CIRC

EKS003PF

1. 

DIAGNOSIS CHECK 1

 With CONSULT-II

●

Perform self-diagnosis. Is “CAN COMM CIRCUIT” indicated?

Yes or No

Yes

>> Repair or replace applicable item. Erase DTC and perform ICC system running test. Then perform

self-diagnosis of ICC system again.

No

>> GO TO 2.

Continuity should exist.

Continuity should not exist.

SKIA1178E

ACS-74

[ICC]

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

2. 

DIAGNOSIS CHECK 2

 With CONSULT-II

●

Perform self-diagnosis of ABS/TCS/VDC control unit. Is malfunction indicated?

Yes or No

Yes

>> Repair or replace applicable item. Erase DTC and perform ICC system running test. Then perform

self-diagnosis of ICC system again.

No

>> Replace ICC unit. Erase DTC and perform ICC system running test. Then perform self-diagnosis

of ICC system again.

DTC 45 BRAKE SW/STOP L SW

EKS005QD

1. 

CHECK CONNECTOR FOR ICC UNIT

1.

Turn ignition switch OFF.

2.

Disconnect ICC unit connector, and connect it securely again. Then erase DTC. After that, perform self-
diagnosis of ICC system again.

OK or NG

OK

>>

●

Poor connector connection

●

Check connector. (Check connector housing for disconnected, loose, bent, and collapsed ter-
minals. If any malfunction is detected, repair applicable part.) After repair, erase DTC, and per-
form ICC system running test. Then perform self-diagnosis of ICC system again.

NG

>> GO TO 2.

2. 

CHECK STOP LAMP SWITCH AND ICC BRAKE SWITCH

 With CONSULT-II

●

With data monitor, check if “STOP LAMP SW” and “BRAKE SW” are operated normally. Refer to 

ACS-59,

"DATA MONITOR"

 . 

OK or NG

OK

>> Replace ICC unit. 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.

3. 

BRAKE SWITCH INSTALLATION AND ADJUSTMENT INSPECTION

●

Check brake switch for proper installation and adjust if necessary. Refer to 

BR-6, "BRAKE PEDAL"

  in BR.

OK or NG

NG

>> After adjustment, erase DTC and perform ICC system running test. Then perform self-diagnosis

of ICC system again.

OK

>> GO TO 4.

4. 

CHECK ICC BRAKE SWITCH

●

Check ICC brake switch. Refer to 

ACS-101, "ICC Brake Switch and Stop Lamp Switch"

 .

OK or NG

OK

>> Replace ICC unit. Erase DTC and perform ICC system running test. Then perform self-diagnosis

of ICC system again.

NG

>> Replace ICC brake switch. Erase  DTC and perform ICC system running test. Then perform self-

diagnosis of ICC system again.

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

ACS-75

[ICC]

C

D

E

F

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ACS

5. 

CHECK STOP LAMP ILLUMINATION

●

Check stop lamp illumination.

OK or NG

NG

>>

●

Check stop lamp circuit.

●

After repair, erase DTC and perform ICC system running test. Then, perform self-diagnosis of
ICC system again.

OK

>> GO TO 6.

6. 

CHECK ICC BRAKE HOLD RELAY

1.

Turn ignition switch OFF.

2.

Check continuity between ICC brake hold relay.

OK or NG

NG

>> Replace brake hold relay. Erase DTC and perform ICC

system running test. Then perform self-diagnosis of ICC
system again.

OK

>> GO TO 7.

7. 

CHECK ICC BRAKE HOLD RELAY CIRCUIT

1.

Disconnect connectors of ICC unit and ICC brake hold relay.

2.

Check continuity between ICC unit harness connector B244 ter-
minal 38 (R/W) and ICC brake hold relay harness connector E38
terminal 7 (R/W).

3.

Check continuity between ICC unit harness connector B244 ter-
minal 38 (R/W) and stop lamp switch harness connector M402
terminal 2 (R/W).

OK or NG

NG

>>

●

Repair harness between ICC unit and ICC brake hold
relay.

●

After repair, erase DTC and perform ICC system running test. Then, perform self-diagnosis of
ICC system again.

OK

>> Replace ICC unit. Erase DTC and perform ICC system running test. Then perform self-diagnosis

of ICC system again.

DTC 46 OPERATION SW CIRC

EKS005QE

1. 

CHECK CONNECTORS ICC UNIT, COMBINATION SWITCH AND ICC STEERING SWITCH

●

Check ICC unit, combination switch and ICC steering switch terminals (ICC unit side, combination switch
side, switch side, and harness side) for looseness and bend.

OK or NG

NG

>> Check connector. (Check connector housing for disconnected, loose, bent, and collapsed termi-

nals. If any malfunction is detected, repair applicable part.) After repair, erase DTC, and perform
ICC system running test. Then perform self-diagnosis of ICC system again.

OK

>> GO TO 2.

6 - 7

Continuity should not exist.

3 - 4

Continuity should exist.

SKIA1180E

Continuity should exist.

Continuity should exist.

SKIA1274E

ACS-76

[ICC]

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

2. 

CHECK ICC STEERING SWITCH SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect connectors of ICC unit and spiral cable.

3.

Check continuity between ICC unit harness connector B245 ter-
minal 49 (B/Y), 58 (GY/L) and spiral cable (on vehicle) M53 ter-
minal 26 (G/OR), 31 (G).

4.

Check continuity between spiral cable (on vehicle) M53 terminal
26 (G/OR), 31 (G) and spiral cable (on switch) M441 terminal 18
(Y), 17 (G).

5.

Check continuity between spiral cable M441 terminal 18 (Y), 17
(G) and ICC steering switch harness connector M443 terminal 1
(Y), 2 (G).

OK or NG

NG

>>

●

Repair harness between ICC unit and spiral cable.

●

After repair, erase DTC and perform ICC system run-
ning test. Then, perform self-diagnosis of ICC system
again.

OK

>> GO TO 3.

3. 

CHECK ICC STEERING SWITCH

●

Check ICC steering switch, refer to 

ACS-101, "ICC Steering Switch"

 .

OK or NG

NG

>> Replace ICC steering switch. Erase DTC and perform ICC system running test. Then perform

self-diagnosis of ICC system again.

OK

>> Replace ICC unit. Erase DTC and perform ICC system running test. Then perform self-diagnosis

of ICC system again.

49 - 26, 58 - 31

Continuity should exist.

PKIA2218E

26 - 18, 31 - 17

Continuity should exist.

PKIA2216E

18 - 1, 17 - 2

Continuity should exist.

SKIA1266E