ECU INFINITI QX56 2004 Factory Service Manual

-1QUICK REFERENCE INDEX AGENERAL INFORMATIONGIGeneral InformationBENGINEEMEngine MechanicalLUEngine Lubrication SystemCOEngine Cooling SystemECEngine Control SystemFLFuel SystemEXExhaust SystemACCAccelerator Control SystemCTRANSMISSION/
TRANSAXLEATAutomatic TransmissionDDRIVELINE/AXLETFTransferPRPropeller ShaftFFDFront Final DriveRFDRear Final DriveFAXFront AxleRAXRear AxleESUSPENSIONFSUFront SuspensionRSURear SuspensionWTRoad Wheels & TiresFBRAKESBRBrake SystemPBParking Brake SystemBRCBrake Control SystemGSTEERINGPSPower Steering SystemHRESTRAINTSSBSeat BeltsSRSSupplemental Restraint System (SRS)IBODYBLBody, Lock & Security SystemGWGlasses, Window System & MirrorsRFRoofEIExterior & InteriorIPInstrument PanelSESeatAPAdjustable PedalsJAIR CONDITIONERATCAutomatic Air ConditionerKELECTRICALSCStarting & Charging SystemLTLighting SystemDIDriver Information SystemWWWiper, Washer & HornBCSBody Control SystemLANLAN SystemAVAudio Visual, Navigation & Telephone SystemACSAuto Cruise Control SystemPGPower Supply, Ground & Circuit ElementsLMAINTENANCEMAMaintenanceMINDEXIDXAlphabetical IndexEdition: February 2004
Revision: August 2007BDACEFGHIJKLM

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ACS-27
[ICC]
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CONSULT-II Function (ICC)EKS007PH
CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
CONSULT-II OPERATION
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carries out CAN communication.
1. Turn ignition switch OFF.
2. Connect CONSULT-II and CONSULT-II CONVERTER to data
link connector.
3. Turn ignition switch ON.
4. Touch “START (NISSAN BASED VHCL)”.
5. Touch “ICC” on the "SELECT SYSTEM" screen.
If “ICC” is not indicated, go to GI-39, "
CONSULT-II Data Link
Connector (DLC) Circuit" .
ICC diagnostic mode Description
WORK SUPPORTSupports inspections and adjustments. Commands are transmitted to the ICC unit for setting the sta-
tus suitable for required operation, input/output signals are received from the ICC unit and received
data is displayed.
SELF-DIAG RESULTS Displays ICC unit self-diagnosis results.
DATA MONITOR Displays ICC unit input/output data in real-time.
CAN DIAG SUPPORT MNTR The results of transmit/receive diagnosis of CAN communication can be read.
ACTIVE TEST Operation of electrical loads can be checked by sending driving signal to them.
ECU PART NUMBER ICC unit part number can be read.
BBIA0369E
BCIA0029E
WKIA1750E

ACS-28
[ICC]
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Revision: August 20072004 QX56
6. Touch “WORK SUPPORT”, “SELF-DIAG RESULTS”, “DATA
MONITOR”, "CAN DIAG SUPPORT MNTR", “ACTIVE TEST” or
“ECU PART NUMBER” on selection screen.
WORK SUPPORT
Work Item
Cause of Auto-Cancel
1. Touch “WORK SUPPORT” on the "SELECT DIAG MODE"
screen.
2. Touch “CAUSE OF AUTO-CANCEL” on the "SELECT WORK
ITEM screen.
3. Cause of automatic cancellation screen will be shown.
4. The last five causes of automatic cancellation of ICC system will
be displayed.
Possible Causes of "Auto-Cancel"
Laser Beam Adjust
For details, refer to ACS-12, "LASER BEAM AIMING ADJUSTMENT" .
SELF-DIAGNOSTIC RESULTS
For details, refer to ACS-36, "Diagnostic Trouble Code (DTC) Chart" .
WKIA2041E
Operation Function
CAUSE OF AUTO-CANCEL Indicates causes of automatic cancellation of the ICC system.
LASER BEAM ADJUST Outputs laser beam, calculates dislocation of the beam, and indicates adjustment direction.
SKIA6191E
Cause of cancellation Description
OPERATING WIPER Windshield wipers were operated at HI or LO speed operation.
OPERATING ABS ABS function was operated.
OPERATING TCS TCS function was operated.
OPERATING VDC VDC function was operated.
OPE SW VOLT CIRC Voltage outside the standard was detected.
LASER SUN BEAM Intense light such as sunlight entered ICC sensor light sensing part.
LASER TEMP Temperature around ICC sensor became low.
OP SW DOUBLE TOUCH ICC steering switches were pressed at the same time.
VDC/TCS OFF SW VDC OFF switch was pressed.
WHEEL SPD UNMATCH Wheel speed became different from AT vehicle speed.
TIRE SLIP Wheel slipped.
PKB SW ON Parking brake is applied.
IGN LOW VOLT Power supply voltage became low.
NO RECORD —

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
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DATA MONITOR
Operation Procedure
1. Touch “DATA MONITOR” on the "SELECT DIAG MODE"
screen.
2. Touch “ECU INPUT SIGNALS”, “MAIN SIGNALS“, or “SELEC-
TION FROM MENU” on "SELECT MONITOR ITEM" screen.
Monitored Item
×: Applicable
WDIA0084E
Monitored Item [unit] MAIN SIGNALSECU
INPUT
SIGNALSSELECTION
FROM MENUDescription
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 signal volt-
age 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 con-
trolled or not (ON means “controlling”).
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).

ACS-30
[ICC]
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Revision: August 20072004 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.
GEAR
[1, 2, 3, 4, 5]××Indicates AT 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 monitored.
VHCL SPD AT
[km/h] or [mph]
×Indicates vehicle speed calculated from AT vehicle
speed sensor by ICC unit via CAN communication
(TCM transmits AT vehicle speed sensor signal via
CAN communication).
PRESS SENS
[bar]×××Indicates brake fluid pressure value calculated
from signal voltage of pressure sensor.
PRESS SENS 2
[bar]××NOTE:
This item is displayed but cannot be monitored.
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 commu-
nication).
AT 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 transmits PNP switch
signal via CAN communication)
DISTANCE×NOTE:
This item is displayed but cannot be monitored.
RELATIVE SPD×NOTE:
This item is displayed but cannot be monitored.
STP LMP DRIVE
[ON/OFF]××Indicates [ON/OFF] status of brake hold relay drive
output. Monitored Item [unit] MAIN SIGNALSECU
INPUT
SIGNALSSELECTION
FROM MENUDescription
SKIA6195E

ACS-34
[ICC]
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Revision: August 20072004 QX56
SELF-DIAGNOSIS BY ICC SYSTEM DISPLAY WILL NOT RUN
Self Diagnosis Will Not Run
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.
WKIA1985E
Component Failure Specific causes
ICC unit power supply malfunction No voltage supply from ignition switch Fuse blown
Harness open
Harness shorted
Ground cable not connected Harness open
Harness shorted
ICC steering switch malfunction No signal transmitted Harness 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 stan-
dard
Combination meter system malfunction Indication not possible Indicator malfunction
Indicator segments disappear
ICC unit malfunction Internal malfunction ICC unit

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ACS-35
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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 ICC unit connectors, 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.
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" .

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
ACS-37
[ICC]
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DTC 11 CONTROL UNITEKS007X3
1. DIAGNOSTIC CHECK
1. Are any items other than “DTC 11 CONTROL UNIT” indicated on self-diagnosis display?
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. Refer to ACS-59, "
ICC Unit" . Erase DTC and perform ICC system running
test. Then perform self-diagnosis of ICC system again.
DTC 12 VDC CONTROL UNITEKS008DH
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 applicable item. Erase DTC and perform ICC system running test. Then per-
form 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 connectors of ICC unit and ABS actuator and electric unit (control unit), and connect them
securely again. Then 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 col-
lapsed terminals. 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.
NG >> GO TO 3.
98 GEAR POSITION××

TCM malfunction

AT turbine revolution sensor mal-
function

AT 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 termsICC sys-
tem
warning
lampFail-safe
Malfunctions detected where...Refer-
ence
page Vehicle-
to-vehi-
cle dis-
tance
control
modeConven-
tional
(fixed
speed)
cruise
control
modeBrake
assist
(with pre-
view
function)

ACS-38
[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Revision: August 20072004 QX56
3. CHECK HARNESS BETWEEN ICC UNIT AND ABS ACTUATOR AND ELECTRIC UNIT (CONTROL
UNIT)
1. Turn ignition switch OFF.
2. Disconnect connectors of ICC unit and ABS actuator and elec-
tric unit (control unit).
3. Check continuity between ICC unit harness connector B13 ter-
minal 10 (V/R) and ABS actuator and electric unit (control unit)
connector E125 terminal 7 (V/R).
OK or NG
OK >> Replace ICC unit. Refer to ACS-59, "ICC Unit" . Erase
DTC and perform ICC system running test. Then per-
form self-diagnosis of ICC system again.
NG >>

Repair harness between ICC unit and ABS actuator and electric unit (control unit).

After repair, erase DTC and perform ICC system running test. Then, perform self-diagnosis of
ICC system again.
DTC 20 CAN COMM CIRCUITEKS007X4
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 LAN-3, "
Precautions When
Using CONSULT-II" .
DTC 31 POWER SUPPLY CIR 1, DTC 34 POWER SUPPLY CIR 2EKS007X5
1. CHECK ICC UNIT CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect ICC unit connector and connect it securely again. Then erase DTC. Then perform self-diagno-
sis of ICC system again.
OK or NG
OK >> GO TO 2.
NG >>

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 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 B17 termi-
nal 33 (R/B), 42 (R/B) and ground.
OK or NG
OK >> GO TO 3.
NG >>

Repair ICC unit power supply harness.

After repair, erase DTC and perform ICC system run-
ning test. Then, perform self-diagnosis of ICC system
again. Continuity should exist.
WKIA2042E
Battery voltage should exist.
SKIA11 73 E

ACS-40
[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Revision: August 20072004 QX56
DTC 45 BRAKE SW/STOP L SWEKS007X8
1. CHECK CONNECTORS FOR ICC UNIT
1. Turn ignition switch OFF.
2. Disconnect ICC unit connectors, and connect them securely again. Then erase DTC. Then, perform self-
diagnosis of ICC system again.
OK or NG
OK >>
Poor connector connection.

Check connectors. (Check connectors housing for disconnected, loose, bent, and collapsed
terminals. 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.
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 operating normally.
OK or NG
OK >> Replace ICC unit. Refer to ACS-59, "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. ICC BRAKE SWITCH INSTALLATION AND ADJUSTMENT INSPECTION

Check ICC brake switch for proper installation and adjust if necessary. Refer to BR-6, "BRAKE PEDAL" .
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-58, "ICC Brake Switch and Stop Lamp Switch" .
OK or NG
OK >> Replace ICC unit. Refer to ACS-59, "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.
5. CHECK STOP LAMP ILLUMINATION

Check stop lamp illumination.
OK or NG
OK >> GO TO 6.
NG >>

Check stop lamp circuit.

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