Infiniti F50. Manual - part 26

TROUBLE DIAGNOSIS FOR SYMPTOMS

ACS-97

[ICC]

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ACS

Symptom 4: The ICC System Is Not Cancelled When the Gear Is in Other Than 
`D'.

EKS003Q4

1. 

D RANGE SWITCH CHECK

 With CONSULT-II

1.

With data monitor, check that “D RANGE SW” operates normally. Refer to 

ACS-59, "DATA MONITOR"

 .

NG or OK

NG

>> GO TO 2.

OK

>> After replacing ICC unit, erase DTC. Perform ICC system running test, and then perform self-diag-

nosis of ICC system again.

2. 

CAN COMMUNICATION INSPECTION

 With CONSULT-II

1.

With CONSULT-II self-diagnosis, check that “CAN COMM CIRCUIT” item exists.

OK or NG

OK

>> Refer to 

ACS-70, "DTC 20 CAN COMM CIRCUIT"

 .

NG

>> GO TO 3.

3. 

D RANGE SWITCH CHECK

1.

With TCM data monitor, check that “D” position switch operates normally.

OK or NG

NG

>> After repairing or replacing malfunctioning part, erase DTC. Perform ICC system running test, and

then perform self-diagnosis of ICC system again.

OK

>> After replacing ICC unit, erase DTC. Perform ICC system running test, and then perform self-diag-

nosis of ICC system again.

Symptom 5: Chime Does Not Sound.

EKS003Q5

The chime may not sound occasionally in the following cases even if the distance from the vehicle ahead is
short:

●

When the speed difference from that of the vehicle ahead is small (both vehicles driving at similar speed).

●

When the vehicle ahead drives at faster speed (the actual distance is increasing).

●

When depressing the accelerator.

●

Chime does not sound when the vehicle is not driving.

●

Chime does not sound when the system does not detect any vehicle ahead. (Diagnose the conditions
under which the system is detecting the vehicle ahead and when the system is malfunctioning. If there is
any malfunction in detecting the vehicle ahead, check the system following the 

ACS-99, "Symptom 8: The

ICC System Frequently Cannot Detect the Vehicle Ahead/The Detection Zone Is Short."

 .

1. 

CHECK ICC WARNING CHIME

1.

With active test, check that ICC warning chime operates normally.

OK or NG

OK

>> Determine preceding vehicle detection status when malfunction occurred. If chime should have

sounded: after replacing ICC unit, erase DTC. Perform ICC system running test, and then perform
self-diagnosis of ICC system again.

NG

>> GO TO 2.

ACS-98

[ICC]

TROUBLE DIAGNOSIS FOR SYMPTOMS

2. 

CHECK ICC WARNING CHIME SIGNAL

1.

Check the voltage between the ICC warning chime harness con-
nector M37 terminals 1 (BR/W), 2 (Y) and ground.

OK or NG

OK

>> GO TO 4.

NG

>>

●

If terminal 1 is NG

: Check corresponding harness, connector, and fuse. After repairing, erase DTC. Perform.
After that, perform self-diagnosis of ICC system.

●

If terminal 2 is NG

: GO TO 3.

3. 

CHECK HARNESS BETWEEN ICC UNIT AND CHIME

1.

Turn ignition switch OFF.

2.

Disconnect connectors of ICC unit and ICC warning chime.

3.

Check for continuity between ICC unit harness connector B243
terminal 21 (Y) and ICC warning chime harness connector M37
terminal 2 (Y).

4.

Check for continuity between ICC unit harness connector B243
terminal 21 (Y) and ground.

OK or NG

NG

>> Check harness between ICC unit and ICC warning chime. After repairing, erase DTC. Perform

ICC system running test, and then perform self-diagnosis of ICC system again.

OK

>> GO TO 5.

4. 

CHECK CONNECTOR ICC WARNING CHIME

1.

Check chime terminals (chime side and harness side) for disconnection, bend, and other irregular condi-
tions.

OK or NG

OK

>> After replacing chime, erase DTC. Perform ICC system running test, and then perform self-diag-

nosis of ICC system again.

NG

>> After repairing terminal and connector, erase DTC. Perform driving check, and then perform self-

diagnosis of ICC system again.

5. 

CHECK CONNECTOR FOR ICC UNIT

1.

Check ICC unit terminals (ICC unit side and harness side) for disconnection, bend, and other irregular
conditions.

OK or NG

OK

>> GO TO 4.

NG

>> After repairing terminal and connector, erase DTC. Perform ICC system running test, and then

perform self-diagnosis of ICC system again.

1 - Ground

: Battery voltage (Approx. 12V) 
(Ignition switch ON   ON)

: Approx. 0V (Ignition switch ON   
OFF)

2 - Ground

: Battery voltage (Approx. 12V) 
(Chime output OFF)

: Approx. 0V (Chime output ON)

SKIA1281E

21 - 2

: Continuity should exist.

21 - Ground

: Continuity should not 
exist.

SKIA1282E

TROUBLE DIAGNOSIS FOR SYMPTOMS

ACS-99

[ICC]

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ACS

Symptom 6: Chime Does Not Stop.

EKS003Q6

1. 

CHECK ICC WARNING CHIME SIGNAL

1.

Check voltage between ICC warning chime harness connector
M37 terminal 2 (Y) and ground.

NOTE:
With active test, turn ON and OFF chime output.

OK or NG

OK

>> After replacing chime, erase DTC. Perform ICC system

running test, and then perform self-diagnosis of ICC
system again.

NG

>> GO TO 2.

2. 

CHECK GROUND CIRCUIT FOR ICC WARNING CHIME

1.

Turn ignition switch OFF.

2.

Disconnect ICC warning chime and ICC unit connector.

3.

Check for continuity between ICC warning chime harness con-
nector M37 terminal 2 (Y) and ground.

OK or NG

OK

>> After replacing chime, erase DTC. Perform ICC system

running test, and then perform self-diagnosis of ICC
system again.

NG

>> Repair harness between ICC unit and chime. After

repairing, erase DTC. Perform ICC system running test, and then perform self-diagnosis of ICC
system again.

Symptom 7: Driving Force Is Hunting.

EKS003Q7

1. 

CHECK ASCD ACTUATOR

1.

Check ASCD actuator. Refer to 

ACS-102, "ASCD Actuator"

 .

OK or NG

NG

>> After repairing applicable parts, erase DTC. Perform ICC system running test, and then perform

self-diagnosis of ICC system again.

OK

>>

ACS-99, "Symptom 8: The ICC System Frequently Cannot Detect the Vehicle Ahead/The Detec-
tion Zone Is Short."

Refer to

Symptom 8: The ICC System Frequently Cannot Detect the Vehicle Ahead/The 
Detection Zone Is Short.

EKS003Q8

The detection function may become unstable in the following cases:

●

When the reflector of the vehicle ahead is deficient/ not clean enough to reflect the radar.

●

When driving a road with extremely sharp corners.

●

When the radar cannot detect the reflector of the vehicle ahead as the vehicle ahead is passing a hill or
passing the peak.

1. 

VISUAL CHECK

1.

Check ICC sensor body window for contamination and foreign materials.

OK or NG

OK

>> If any contamination or foreign materials are found, remove them. Then perform ICC system run-

ning test.

NG

>> GO TO 2.

2 - Ground:

Battery voltage (Approx. 12V) 
(Chime output OFF: Approx. 0V)

SKIA1283E

Continuity should not exist.

SKIA1284E

ACS-100

[ICC]

TROUBLE DIAGNOSIS FOR SYMPTOMS

2. 

OPERATION CHECK

1.

After adjusting ICC sensor beam aiming, perform ICC system running test. Check that preceding vehicle
detection performance has been improved.

OK or NG

OK

>> Inspection is completed.

NG

>>

●

Replace ICC sensor, and perform laser ICC system running test beam aiming adjustment.

●

After performing above, erase DTC. Perform ICC system running test, and then perform self-
diagnosis of ICC system again.

Symptom 9: The System Does Not Detect the Vehicle Ahead at All.

EKS003Q9

1. 

VISUAL CHECK

1.

With ignition switch turned ON (engine not started), check that all indicator lamps in ICC system display
are continuously lit. (Check for a missing segment in preceding vehicle detection display.) 

OK or NG

OK

>> GO TO 2.

NG

>> Check for combination meter. Refer to

DI-26, "ICC System Display Does Not Illuminate"

  in DI.

2. 

 VISUAL CHECK

●

Check ICC sensor body window for contamination and foreign materials.

OK or NG

OK

>> If any contamination or foreign materials are found, remove them. Perform ICC system running

test.

NG

>> GO TO 4.

3. 

VISUAL CHECK

●

Check ICC sensor body window for cracks and scratches.

OK or NG

OK

>>

●

Replace ICC sensor, and perform laser beam aiming adjustment.

●

After performing above, erase DTC. Perform ICC system running test, and then perform self-
diagnosis of ICC system again.

NG

>> GO TO 4.

4. 

ADJUST ICC SENSOR

1.

After adjusting ICC sensor beam aiming, perform ICC system running test. Check that preceding vehicle
detection performance has been improved.

OK or NG

OK

>> Inspection is completed.

NG

>>

●

Replace ICC sensor, and perform laser ICC system running test beam aiming adjustment.

●

After performing above, erase DTC. Perform ICC system running test, and then perform self-
diagnosis of ICC system again.