INFINITI QX56 2006 Factory Workshop Manual

ACS-28
[ICC]
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Revision: November 20092006 QX56
SELF-DIAGNOSTIC RESULTS
For details, refer to ACS-36, "Diagnostic Trouble Code (DTC) Chart" .
DATA MONITOR
Operation Procedure
1. Touch “DATA MONITOR ” on "SELECT DIAG MODE" screen.
2. Touch “ECU INPUT SIGNALS ”, “MAIN SIGNALS “, or “SELEC-
TION FROM MENU ” on "SELECT MONITOR ITEM" screen.
Monitored Item
×: Applicable
BCIA0031E
WDIA0084E
Monitored Item [unit] MAIN SIGNALS ECU
INPUT
SIGNALS SELECTION
FROM MENU Description
VHCL SPEED SE
[km/h] or [mph] ××× Indicates vehicle speed calculated from
wheel speed sensor signal.
SET VHCL SPD
[km/h] or [mph] ×× Indicates set vehicle speed stored in ICC
unit.
THRTL OPENING
[%] ×××
Indicates throttle angle calculated from sig-
nal voltage of throttle position sensor.
ENGINE RPM
[rpm] ××Indicates engine speed read by ICC unit via
CAN communication (ECM transmits
engine speed via CAN communication).
DISTANCE ADJ
[SHOR/MID/LONG] ×××
Indicates set distance stored in ICC unit.
WIPER SW
[OFF/LOW/HIGH] ××Indicates wiper [OFF/LOW/HIGH] status.
MAIN SW
[ON/OFF] ××× Indicates [ON/OFF] status as judged from
control switch signal.
SET/COAST SW
[ON/OFF] ×××
Indicates [ON/OFF] status as judged from
control switch signal.
CANCEL SW
[ON/OFF] ××× Indicates [ON/OFF] status as judged from
control switch signal.
RESUME/ACC SW
[ON/OFF] ××× Indicates [ON/OFF] status as judged from
control switch signal.
CRUISE OPE
[ON/OFF] ××
Indicates whether vehicle speed is being
controlled or not (ON means “
controlling”).

TROUBLE DIAGNOSIS — GENERAL DESCRIPTIONACS-29
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BRAKE SW
[ON/OFF]××× Indicates [ON/OFF] status as judged from
ICC brake switch signal.
STOP LAMP SW
[ON/OFF] ×××
Indicates [ON/OFF] status as judged from
stop lamp switch signal.
RELEASE SW NO
[ON/OFF] ××Indicates [ON/OFF] status as judged from
release switch signal.
ON when brake is depressed.
OFF when brake is not depressed.
RELEASE SW NC
[ON/OFF] ××Indicates [ON/OFF] status as judged from
release switch signal.
OFF when brake is depressed.
ON when brake is not depressed.
IDLE SW
[ON/OFF] ××Indicates [ON/OFF] status of idle switch
read by ICC unit via CAN communication
(ECM transmits ON/OFF status via CAN
communication).
GEAR
[1, 2, 3, 4, 5] ××Indicates A/T gear position read by ICC unit
via CAN communication (TCM transmits
gear position via CAN communication).
BUZZER O/P
[ON/OFF] ×Indicates [ON/OFF] status of ICC warning
output.
ICC WARNING ×NOTE:
This item is displayed but cannot be moni-
tored.
VHCL SPD AT
[km/h] or [mph] ×Indicates vehicle speed calculated from A/T
vehicle speed sensor by ICC unit via CAN
communication (TCM transmits A/T vehicle
speed sensor signal via CAN communica-
tion).
PRESS SENS
[bar] ××× Indicates brake fluid pressure value calcu-
lated from signal voltage of pressure sen-
sor.
PRESS SENS 2
[bar] ××NOTE:
This item is displayed but cannot be moni-
tored.
D RANGE SW
[ON/OFF] ××Indicates [ON/OFF] status of
“D ” position
read by ICC unit via CAN communication
(TCM transmits ON/OFF condition of “ D”
position via CAN communication).
A/T OD OFF
[ON/OFF] ×
Indicates [ON/OFF] status of OD cancel
output under control.
NP RANGE SW
[ON/OFF] ××Indicates PNP switch signal read by ICC
unit via CAN communication. (TCM trans-
mits PNP switch signal via CAN communi-
cation)
DISTANCE ×NOTE:
This item is displayed but cannot be moni-
tored.
RELATIVE SPD ×NOTE:
This item is displayed but cannot be moni-
tored.
STP LMP DRIVE
[ON/OFF] ×× Indicates [ON/OFF] status of brake hold
relay drive output.
Monitored Item [unit] MAIN SIGNALS
ECU
INPUT
SIGNALS SELECTION
FROM MENU Description

ACS-30
[ICC]
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Revision: November 20092006 QX56
ACTIVE TEST
CAUTION:
Do not perform the active test while driving. Active test cannot be started while ICC system warning
indicator is illuminated.
Active Test
1. Touch “ACTIVE TEST” on "SELECT DIAG MODE" screen.
2. Touch any of “ICC BUZZER 1”, “METER LAMP ”, “STOP LAMP”
and “BOOSTER SOL/V 3 ” on "SELECT TEST ITEM" screen.
3. Touch “START”.
4. Active test screen will be shown.
ICC BUZZER 1

To u c h “ON” and “OFF” to check that ICC warning chime oper-
ates as in the following chart.
BCIA0031E
SKIA6195E
ICC BUZZER 1 ONOFF
Buzzer sound BeepNot activated
SKIA1228E

TROUBLE DIAGNOSIS — GENERAL DESCRIPTIONACS-31
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METER LAMP

Start engine.

Touch “ON” and “OFF” to check that ICC system displays operate as required.

The following ICC lamps will illuminate at the same time,
CRUISE (orange), CRUISE (green), SET and ICC digital dis-
play.
STOP LAMP

Touch “ON” and “OFF” to check that the stop lamps operate as
in the following chart.
BOOSTER SOL/V 3

Touch any of “MODE 1”, “MODE 2”, “MODE 3” to check that fol-
lowing operation condition is caused by operating monitor and
brake pedal.

“START ” is displayed 10 seconds after operation start. (Active
test is completed.)
Self-Diagnostic FunctionEKS00BLY
WITH CONSULT-II
1. Go to operation check after asking the customer for symptom information. Refer to ACS-9, "ACTION
TEST" .
2. Stop vehicle, turn ignition switch OFF, then connect CONSULT-II and CONSULT-II CONVERTER to data link connector.
METER LAMP ONOFF
All ICC system dis-
plays Full illumination
OFF
SKIA1231E
STOP LAMP ONOFF
Stop lamp Lamp ONLamp OFF
SKIA1232E
SKIA1233E
PKIA0363J

ACS-32
[ICC]
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Revision: November 20092006 QX56
3. With engine started, touch “START”, “ICC ”, “SELF-DIAG RESULTS ” on CONSULT-II screen in this order.
CAUTION:
If “ICC” cannot be shown after several attempts, the ICC unit may be malfunctioning and should
be replaced. Refer to ACS-59, "
ICC Unit" .
4. Self-diagnostic result appears on screen. If “NO DTC ···” is shown, check ICC warning lamp. If any mal-
function is indicated, GO TO step 5.
5. Refer to ACS-36, "
Diagnostic Trouble Code (DTC) Chart" , perform appropriate check, and repair or
replace malfunctioning part as necessary.
6. Turn ignition switch OFF.
7. Start engine and touch “START ”, “ICC ”, “SELF-DIAG RESULTS ”, and “ERASE ” on CONSULT-II.
CAUTION:
DTC of an existing malfunction will not erase. If the memory does not erase, GO TO step 5.
8. Perform ICC system running test (drive vehicle with ICC system ON), and make sure that ICC warning lamp does not illuminate.
WITHOUT CONSULT-II
1. Go to operation check after asking the customer for symptom information. Refer to ACS-9, "ACTION
TEST" .
2. Stop the vehicle to start the self-diagnosis.
3. Turn ignition switch OFF.
4. Turn ignition switch ON, and wait 5 seconds. Press ACCEL/RES switch 5 times, and then press COAST/SET switch 5 times all
within 5 seconds to start self-diagnosis.
CAUTION:

Do not start the engine.

Do not press the ICC ON/OFF switch ON.

When operation above is not completed within the 5 to 10
second window, DTC will not be displayed.

If self-diagnosis mode cannot be started after several
attempts, the ICC unit may be malfunctioning and should be
replaced. Refer to ACS-33, "
SELF-DIAGNOSIS BY ICC SYS-
TEM DISPLAY WILL NOT RUN" .
5. When self-diagnosis mode is started, DTCs are shown on set vehicle speed indicator.
CAUTION:

DTC will disappear after 5 minutes.
WKIA1921E
WKIA1922E

TROUBLE DIAGNOSIS — GENERAL DESCRIPTIONACS-33
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When multiple malfunctions are detected, a maximum of 3 code numbers can be stored; the lat-
est malfunction will be displayed first.
6. Check ACS-36, "
Diagnostic Trouble Code (DTC) Chart" , and repair or replace if necessary.
7. After repair, erase DTC stored in the ICC unit. Refer to ACS-33, "
Self-Diagnostic Erasing Method"
8. DTC 55 will be shown.
9. Turn ignition switch OFF to exit the diagnosis.
10. Perform ICC system running test (drive vehicle with ICC system ON), and make sure that ICC warning
lamp does not illuminate.
Self-Diagnostic Erasing Method
1. Stop the vehicle and turn the ignition switch OFF.
2. Turn ignition switch ON and start self-diagnosis.
3. During self-diagnosis mode, press CANCEL switch 5 times, and DISTANCE switch 5 times within a 10second time period.
CAUTION:

Switch inputs must be received within a 10 second time period.

When operation is not completed within 10 seconds start again from step 1.
4. DTC 55 will be shown. CAUTION:
DTC of an existing malfunction will not be erased.
5. Turn ignition switch OFF to exit the diagnosis.
6. Perform ICC system running test (drive vehicle with ICC system ON), and make sure that ICC system warning lamp (orange) does not illuminate.
SELF-DIAGNOSIS BY ICC SYSTEM DISPLAY WILL NOT RUN
Self Diagnosis Will Not Run
WKIA1985E
Component Possible Cause Specific causes
ICC unit power supply malfunction No voltage supply from ignition switchFuse blown
Harness open
Harness shorted
Ground cable not connected Harness open
Harness shorted
ICC steering switch malfunction No signal transmittedHarness open
Harness shorted
Spiral cable open
Spiral cable shorted
Switch or ECM malfunction
CAN communication system malfunction Signal not transmitted Harness open
Harness shorted
CAN communication outside the standard

ACS-34
[ICC]
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Revision: November 20092006 QX56
1. CHECK ICC SYSTEM DISPLAY
When ignition switch is ON, do all displays illuminate?
YES or NO
YES >> GO TO 2.
NO >> GO TO 5.
2. CHECK SELF-DIAGNOSIS

Disconnect ECM connectors, and check for damaged, bent or loose terminals. Securely connect them
again.

Can self-diagnosis for ICC system be performed?
YES or NO
YES >> Inspection End.
NO >> GO TO 3.
3. CHECK ICC STEERING SWITCH
Check ICC steering switch. Refer to ACS-58, "
ICC Steering Switch" .
OK or NG
OK >> GO TO 4.
NG >> Replace ICC steering switch. Refer to ACS-59, "
ICC Steering Switch" .
4. CHECK HARNESS BETWEEN ECM AND ICC STEERING SWITCH
Check harness and spiral cable between ECM and ICC steering switch for open or short circuit.
OK or NG
OK >> GO TO 6
NG >> Repair or replace harness or spiral cable between ECM and ICC steering switch.
5. CHECK POWER SUPPLY FOR ICC UNIT

Check ICC unit power supply, and repair if necessary.

When ignition switch is ON, do all displays illuminate?
YES or NO
YES >> Perform self-diagnosis again.
NO >> GO TO 6.
6. CHECK CONNECTOR FOR ICC UNIT

Disconnect connectors ICC unit, and check terminals for bends and looseness. Securely connect them
again.

When ignition switch is ON, do all displays illuminate?
YES or NO
YES >> Perform self-diagnosis again.
NO >> GO TO 7.
Combination meter system malfunction Indication not possible Indicator malfunction
Indicator segments disappear
ICC unit malfunction Internal malfunction ICC unit Component Possible Cause Specific causes

TROUBLE DIAGNOSIS — GENERAL DESCRIPTIONACS-35
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7. CHECK CAN COMMUNICATION
Perform self-diagnosis with CONSULT-II, and check CAN communication system for malfunction.
OK or NG
OK >> Replace combination meter. Refer to IP-13, "COMBINATION METER" .
NG >> CAN communication inspection. Refer to ACS-38, "
DTC 20 CAN COMM CIRCUIT" .

ACS-36
[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Revision: November 20092006 QX56
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMSPFP:00000
Diagnostic Trouble Code (DTC) ChartEKS00BLZ
×:Applicable
DTC No. CONSULT-II screen terms ICC sys-
tem
warning
lamp Fail-safe
Malfunctions detected where... Refer-
ence
page
Ve h ic le -
to-vehi-cle dis-
tance
control mode Conven-
tional
(fixed
speed) cruise
control mode Brake
assist
(with pre- view
function)
11 CONTROL UNIT ××××

ICC unit internal malfunctionACS-37
12 VDC CONTROL UNIT ××××

VDC malfunction

Brake booster signal harness is
open or shortedACS-37
20 CAN COMM CIRCUIT
××××
ICC unit detected CAN communi-
cation malfunctionACS-38
31 POWER SUPPLY CIR1
××××
ICC unit power supply voltage is
excessively low (less than 8V)ACS-38
34 POWER SUPPLY CIR2
××××
ICC unit power supply voltage is
excessively high.ACS-38
41 VHCL SPEED SE CIRC
××××

Wheel sensor malfunction

ABS actuator and electric unit
(control unit) malfunction

A/T vehicle speed sensor mal-
function

TCM malfunctionACS-39
43 VDC/TCS/ABS CIRC
××××
VDC/TCS/ABS system malfunc-
tionACS-39
45 BRAKE SW/ STOP L SW
××××

ICC brake switch or stop lamp
switch harness is open or shorted

ICC brake switch or stop lamp
switch is stuck to OFF

ICC brake switch or stop lamp
switch is stuck to ONACS-40
46 OPERATION SW CIRC
×××

ICC steering switch harness or
spiral cable is open or shorted

ICC steering switch malfunctionACS-41
74 LASER BEAM OFF CNTR
×××
Laser beam of ICC sensor is off
the aiming point ACS-42
90 STOP LAMP RLY FIX
×××
Normally open terminal of stop
lamp relay is stuck ACS-43
92 ECM CIRCUIT
××××

ECM malfunction

Accelerator pedal position sensor
malfunction

ICC unit malfunctionACS-47
96 NP RANGE
×××

Park/neutral position switch har-
ness is open or shorted

Park/neutral position switch mal-
function

TCM malfunctionACS-48
97 AT CIRCUIT
×××
TCM malfunctionACS-48

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMSACS-37
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NOTE: DTC 55 will display when no malfunction is detected.
DTC 11 CONTROL UNITEKS00BM0
1. DIAGNOSTIC CHECK
Are any items other than “DTC 11 CONTROL UNIT ” indicated on self-diagnosis display?
YES or NO
YES >> Repair or replace as necessary. Erase DTC and perform ICC system running test. Refer to ACS-
9, "ICC System Running Test" . Then perform self-diagnosis of ICC system again.
NO >> Replace ICC unit. Refer to ACS-59, "
ICC Unit" . Erase DTC and perform ICC system running test.
Refer to ACS-9, "
ICC System Running Test" . Then perform self-diagnosis of ICC system again.
DTC 12 VDC CONTROL UNITEKS00BM1
1. DIAGNOSIS CHECK
With CONSULT-II
Perform self-diagnosis of ABS actuator and electric unit (control unit). Is malfunction indicated?
YES or NO
YES >> Repair or replace as necessary. Erase DTC and perform ICC system running test. Refer to ACS-
9, "ICC System Running Test" . Then perform self-diagnosis of ICC system again.
NO >> GO TO 2.
2. CHECK CONNECTOR ICC UNIT AND ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
1. Turn ignition switch OFF.
2. Disconnect ICC unit, and ABS actuator and electric unit (control unit) connectors, and connect them securely again. Erase DTC, then perform self-diagnosis of ICC system again.
OK or NG
OK >> Poor connector connection. Check connector housing for disconnected, loose, bent and collapsed terminals. If any malfunction is detected, repair as necessary. Erase DTC and perform ICC sys-
tem running test. Refer to ACS-9, "
ICC System Running Test" . Then perform self-diagnosis of
ICC system again.
NG >> GO TO 3.
98 GEAR POSITION ×××

TCM malfunction

A/T turbine revolution sensor
malfunction

A/T vehicle speed sensor mal-
functionACS-49
102 LASER STAIN
×× ×
ICC sensor body window has
contaminationACS-49
103 LASER SENSOR FAIL
×× ×
ICC sensor internal malfunctionACS-50
104 LASER AIMING INCMP ×× ×
Laser beam aiming of ICC sensor
is not adjustedACS-50
107 LASER COMM FAIL
×× ×

CAN data received by ICC sen-
sor is strange (from ICC unit,
combination meter or ECM)ACS-51
109 LASER HIGH TEMP
×× ×
Temperature around ICC sensor
is excessively highACS-51
DTC
No. CONSULT-II screen terms ICC sys-
tem
warning lamp Fail-safe
Malfunctions detected where... Refer-
ence
page
Vehicle-
to-vehi-cle dis- tance
control mode Conven-
tional
(fixed
speed) cruise
control
mode Brake
assist
(with pre- view
function)