Infiniti QX4. Electrical System (2003 year). Manual

Trouble Diagnosis - General Description

NBEL0467

WORK FLOW

NBEL0467S01

SKIA1227E

쐌

Reference 1··· Refer to “Self-Diagnostic Function” EL-315.

쐌

Reference 2··· Refer to “Diagnostic Trouble Code (DTC) Chart”
EL-320.

쐌

Reference 3··· Refer to “Symptom Chart” EL-360.

쐌

Reference 4··· Refer to “SELF-DIAGNOSIS BY CONSULT-II
WILL NOT RUN” EL-317/“SELF-DIAGNOSIS BY ICC SYS-
TEM DISPLAY WILL NOT RUN” EL-318.

IDX

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis - General Description

EL-309

CONSULT-II FUNCTION

NBEL0467S02

Description

NBEL0467S0201

CONSULT-II executes following functions by combining data
reception and command transmission via communication line from
ICC unit.

Test mode

Function

WORK SUPPORT

쐌

Monitors aiming direction to facilitate laser beam aiming operation.

쐌

Indicates causes of automatic cancellation of the ICC system.

SELF-DIAGNOSTIC
RESULTS

Displays malfunctioning system memorized in ICC unit.

DATA MONITOR

Displays real-time input/output data of ICC unit.

ACTIVE TEST

Enables operation check of electrical loads by sending driving signal to them.

ECU PART NUMBER

Displays part number of ICC unit.

Work Support

NBEL0467S0202

Work Item

Operation

Function

LASER BEAM ADJUST

Outputs laser beam, calculates dislocation of the beam, and indicates adjustment direction.

CAUSE OF AUTO-CANSEL

Indicates causes of automatic cancellation of the ICC system.

LASER BEAM ADJUST
For details, refer to “LASER BEAM AIMING ADJUSTMENT”
EL-286.
CAUSE OF AUTO-CANCEL
1.

Turn ignition switch OFF.

Connect CONSULT-II to data link connector.

Turn ignition switch ON.

Touch “START” on the display.

Touch “ICC” on the selection screen.

Touch “WORK SUPPORT” on the selection screen.

Touch “CAUSE OF AUTO-CANCEL” on the selection screen.

Cause of automatic cancellation screen will be shown.

CAUTION:

Last five cancel (system cancel) causes are displayed.

Display Item List

Cause of cancellation

Description

OPERATING WIPER

Windshield wipers were operated at HI or LO speed and the fastest position of intermit-
tent operation.

OPERATING ABS

ABS was operated.

OPE SW VOLT CIRC

Outside the standard control switch input voltage 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

Multiple control switches were pressed at the same time.

TIRE SLIP

Wheel slipped.

PKB SW ON

Parking brake is applied.

IGN LOW VOLT

Power supply voltage became low.

NO RECORD

—

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis - General Description (Cont’d)

EL-310

Self-diagnostic Results

NBEL0467S0205

For details, refer to “Diagnostic Trouble Code (DTC) Chart” EL-320.

Data Monitor

NBEL0467S0206

Turn ignition switch OFF.

Connect CONSULT-II to data link connector.

Turn ignition switch ON.

Touch “START” on the display.

Touch “ICC” on the selection screen.

Touch “DATA MONITOR” on the selection screen.

Touch any of “ECU INPUT SIGNALS”, “MAIN SIGNALS”,
“CAN DIAG SUPPORT MNTR”, and “SELECTION FROM
MENU” on selection screen.

Touch “SETTING”.

Display the data monitor.

10. If necessary, touch “PRINT” in turn, and print data.

Monitored Item

: Applicable

Monitored Item [unit]

MAIN SIG-

NALS

ECU INPUT

SIGNALS

CAN DIAG

SUPPORT

MNTR

SELEC-

TION

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 memorized in
ICC unit.

ENGINE RPM
[rpm]

Indicates engine speed calculated from
tachometer signal.

DISTANCE ADJ
[SHOR/MID/LONG]

Indicates set distance memorized in ICC
unit.

WIPERSW
[OFF/LOW/HIGH]

Indicates wiper [OFF/LOW/HIGH] status.

MAIN SW [ON/OFF]

Indicates [ON/OFF] status as judged from
control switch signal.

CANSEL 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.

RESUME/ACC SW
[ON/OFF]

Indicates [ON/OFF] status as judged from
control switch signal.

CRUISE OPE
[ON/OFF]

Indicates whether controlling 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.

IDX

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis - General Description (Cont’d)

EL-311

Monitored Item [unit]

MAIN SIG-

NALS

ECU INPUT

SIGNALS

CAN DIAG

SUPPORT

MNTR

SELEC-

TION

FROM
MENU

Description

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.

FULL SW
[ON/OFF]

Indicates [ON/OFF] status of Full switch.

BUZZER O/P
[ON/OFF]

Indicates [ON/OFF] status of ICC war out-
put.

ICC WARNING
[ON/OFF]

Indicates [ON/OFF] status of ICC system
warning lamp.

PRESS SENS
[bar]

Indicates brake fluid pressure value calcu-
lated from signal voltage of pressure sen-
sor.

THRTL SENSOR
[deg]

Indicates throttle angle calculated from sig-
nal voltage of throttle position sensor.

VACUUM PUMP
[msec]

Indicates vacuum pump driving pulse width

AIR VALVE
[msec]

Indicates air valve driving pulse width

STP LMP DRIVE
[ON/OFF]

Indicates [ON/OFF] status of brake hold
relay drive output.

GEAR
[1, 2, 3, 4, 5, 6]

Indicates AT gear position read shift sole-
noid A and shift solenoid B.

AT OD OFF
[ON/OFF]

Indicates [ON/OFF] status of OD cancel
output under control.

PWR SUP-VALVE
[ON/OFF]

Indicates [ON/OFF] status of power supply
relay to vacuum pump, air valve, and
release valve.

CRUISE SIGNAL
[ON/OFF]

Indicates whether controlling or not (ON
means “controlling”).

A SOL/V

Indicates [ON/OFF] status of shift solenoid
A signal

B SOL/V

Indicates [ON/OFF] status of shift solenoid
B signal

D RANGE SW
[ON/OFF]

Indicates [ON/OFF] status of “D” position
read by ICC unit.

CAN CIRC 1
[OK/UNKWN]

Indicates [OK/UNKWN] status of CAN com-
munication signal.

CAN CIRC 2
[OK/UNKWN]

UNKWN fixed display

CAN CIRC 3
[OK/UNKWN]

UNKWN fixed display

CAN CIRC 4
[OK/UNKWN]

UNKWN fixed display

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis - General Description (Cont’d)

EL-312

Monitored Item [unit]

MAIN SIG-

NALS

ECU INPUT

SIGNALS

CAN DIAG

SUPPORT

MNTR

SELEC-

TION

FROM
MENU

Description

CAN CIRC 5
[OK/UNKWN]

UNKWN fixed display

CAN CIRC 6
[OK/UNKWN]

UNKWN fixed display

CAN CIRC 7
[OK/UNKWN]

Indicates [OK/UNKWN] status of CAN com-
munication signal.

CAN CIRC 8
[OK/UNKWN]

Indicates [OK/UNKWN] status of CAN com-
munication signal.

CAN CIRC 9
[OK/UNKWN]

UNKWN fixed display

CAN CIRC 10
[OK/UNKWN]

Indicates [OK/UNKWN] status of CAN com-
munication signal.

CAN CIRC 11
[OK/UNKWN]

Indicates [OK/UNKWN] status of CAN com-
munication signal.

CAN CIRC 12
[OK/UNKWN]

UNKWN fixed display

CAN CIRC 13
[OK/UNKWN]

UNKWN fixed display

CAN CIRC 14
[OK/UNKWN]

UNKWN fixed display

CAN CIRC 15
[OK/UNKWN]

UNKWN fixed display

CAN COMM[OK/NG]

Indicates [OK/UNKWN] status of CAN com-
munication signal.

Active Test

NBEL0467S0207

CAUTION:

쐌

Do not perform the active test while driving.

쐌

Active test cannot be started while ICC system warning
indicator illuminates.

Turn ignition switch OFF.

Connect CONSULT-II to data link connector and start engine.

Touch “START”, “ICC”, and “ACTIVE TEST” on CONSULT-II
display in turn.

Touch necessary test item.

Touch “START”.

Active test screen will be shown.

SKIA1228E

ICC BUZZER 1

쐌

Touch “ON” and “OFF” to check that ICC warning chime oper-
ates as in the following chart.

BUZZER O/P

OFF

Buzzer sound

Beep

Not activated

IDX

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis - General Description (Cont’d)

EL-313

SKIA1229E

ICC WARNING LAMP

쐌

Touch “ON” and “OFF” to check that ICC warning lamp oper-
ates as in the following chart.

ICC WARNING LAMP

OFF

ICC system warning
lamp (Orange)

Lamp ON

Lamp OFF

SKIA1231E

METER LAMP

쐌

Start engine.

쐌

Touch “ON” and “OFF” to check that ICC system display oper-
ates as in the following chart.

Operation

OFF

ICC system display

Full illumination

OFF

SKIA1232E

STOP LAMP

쐌

Touch “ON” and “OFF” to check that stop lamp operates as in
the following chart.

STP LMP DRIVE

OFF

Stop lamp

Lamp ON

Lamp OFF

SKIA1233E

BOOSTER SOL/V 3

쐌

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

쐌

“START” is displayed 10 seconds after operation start. (Active
test is completed.)

PKIA0363J

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis - General Description (Cont’d)

EL-314

SELF-DIAGNOSTIC FUNCTION

NBEL0467S03

With CONSULT-II

NBEL0467S0301

Go to operation check after asking the customer for symptom
information. Refer to “ACTION TEST” EL-284.

Stop vehicle, turn ignition switch OFF, then connect CON-
SULT-II connector to data link connector.

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 have had malfunction. Repair or replace it. Refer to
“SELF-DIAGNOSIS BY CONSULT-II WILL NOT RUN” EL-317.
4.

Self-diagnostic result appears on screen. If “NO DTC ···” is
shown, check ICC warning lamp. If any malfunction is
indicated, GO TO step 5.

According to “Diagnostic Trouble Code (DTC) Chart” EL-320,
perform appropriate check, and repair or replace malfunction-
ing part as necessary.

Turn ignition switch OFF.

Start

engine

and

touch

“START”,

“ICC”,

“SELF-DIAG

RESULT”, and “ERASE” on CONSULT-II display in turn to
erase the memory.

CAUTION:

If the memory does not erase, go to 5.
8.

Perform ICC system running test (drive vehicle with ICC sys-
tem ON), and make sure that ICC warning lamp does not illu-
minate.

Without CONSULT-II

NBEL0467S0302

Go to operation check after asking the customer for symptom
information. Refer to “ACTION TEST” EL-284.

Stop the vehicle to start the self-diagnosis.

Turn ignition switch OFF.

SKIA1235E

Turn ignition switch ON, and within 5 to 10 seconds, press
ACCELERATE/RESUME switch 5 times. Then press COAST/
SET switch 5 times to start self-diagnosis.

CAUTION:

쐌

Do not start the engine.

쐌

Do not turn the ON/OFF switch ON.

쐌

When operation above is not completed within 5 to 10
seconds, start again from above go to 3.

쐌

If self-diagnosis mode cannot be start after several
attempts, the ICC unit may have had malfunction. Repair
or replace it. Refer to “SELF-DIAGNOSIS BY ICC SYSTEM
DISPLAY WILL NOT RUN” EL-318.

When self-diagnosis mode is started, DTCs are shown on set
vehicle speed indicator.

IDX

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis - General Description (Cont’d)

EL-315

SEL518Y

CAUTION:

쐌

DTCs will disappear after 5 minutes.

쐌

When more than one malfunctions are detected, a maxi-
mum of 3 code numbers can be stored; the latest malfunc-
tion will be displayed first.

Check “Diagnostic Trouble Code (DTC) Chart” EL-320, and
repair or replace if necessary.

After repair, erase DTCs stored in the ICC unit.

DTC 55 will be shown.

Turn ignition switch OFF to exit the diagnosis.

10. Perform ICC system running test (drive vehicle with ICC sys-

tem ON), and make sure that ICC warning lamp does not illu-
minate.

Self-Diagnostic Erasing Method
11. Stop the vehicle and turn the ignition switch OFF.
12. Turn ignition switch ON and start self-diagnosis.
13. During self-diagnosis mode, press CANSEL switch 5 times,

and DISTANCE switch 5 times in this order.

CAUTION:

쐌

Press them within 10 seconds after pressing CANSEL
switch at first.

쐌

When operation is not completed within 10 seconds, start
again.

14. DTC 55 will be shown.

CAUTION:

DTCs of an existing malfunction will not be erased.
15. Turn ignition switch OFF to exit the diagnosis.
16. Perform ICC system running test (drive vehicle with ICC sys-

tem ON), and make sure that ICC system warning lamp
(orange) does not illuminate.

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis - General Description (Cont’d)

EL-316

Self-diagnosis by CONSULT-II Will Not Run

NBEL0467S0303

SKIA1238E

Possible Irregular Condition

Open or short lines

Trouble phenomenon

Malfunction causes

ICC unit power supply malfunction

No voltage supply from ignition switch

Ignition relay malfunctioned

Fuse blown

Harness open

Harness shorted

Ground cable not connected

Harness open

Harness shorted

CONSULT-II malfunction

Signal not transmitted to data link connec-
tor

Harness open

Harness shorted

CONSULT-II malfunction

ICC unit malfunction

CHECK CONSULT-II SYSTEM

쐌

Can CONSULT-II call other systems?

Yes or No

Yes

䊳

GO TO 2.

䊳

쐌

Check CONSULT-II body.

쐌

Check battery and harness.

CHECK POWER SUPPLY FOR ICC UNIT

쐌

Is ICC unit turned ON?

Yes or No

Yes

䊳

GO TO 3.

䊳

Check power supply system, and repair if necessary.

IDX

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis - General Description (Cont’d)

EL-317

CHECK HARNESS FOR DATA LINK CONNECTOR

쐌

Is continuity between ICC unit and data link connector normal?

Yes or No

Yes

䊳

GO TO 4.

䊳

Harness repair

SELF-DIAGNOSIS CHECK

쐌

Disconnect ICC unit connector, and check terminals for bend and looseness. Securely connect it again.

쐌

Enter self-diagnosis mode?

Yes or No

Yes

䊳

Inspection is completed.

䊳

ICC unit replacement

Self-diagnosis by ICC System Display Will Not Run.

NBEL0467S0304

SEL519Y

Possible Irregular Condition

Open or short lines

Trouble phenomenon

Malfunction 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 malfunction

Meter communication system malfunction

Signal not transmitted

Harness open

Harness shorted

Combination meter system malfunction

Indication not possible

Indicator malfunction

Indicator segments disappear.

ICC unit malfunction

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis - General Description (Cont’d)

EL-318

CHECK ICC SYSTEM DISPLAY

쐌

When ignition switch is ON, do all displays illuminate?

Yes or No

Yes

䊳

GO TO 2.

䊳

GO TO 5.

CHECK ICC STEERING SWITCH

쐌

Check ICC steering switch. EL-376, “Refer to ICC Steering Switch”.

OK or NG

䊳

GO TO 3.

䊳

Replace ICC steering.

CHECK HARNESS BETWEEN ICC UNIT AND ICC STEERING SWITCH

쐌

Check harness and spiral cable between ICC unit and ICC steering switch for open or short circuit.

OK or NG

䊳

GO TO 4.

䊳

Replace ICC steering.

CHECK SELF-DIAGNOSIS

쐌

Disconnect connector of ICC unit, and check terminals for bend and looseness. Securely connect it again.

쐌

Enter self-diagnosis mode?

Yes or No

Yes

䊳

Inspection is completed.

䊳

GO TO 5.

CHECK POWER SUPPLY FOR ICC UNIT

쐌

Check ICC unit power supply, and repair if necessary.

쐌

When ignition switch is ON, do all displays illuminate?

Yes or No

Yes

䊳

Perform self-diagnosis again.

䊳

GO TO 6.

CHECK CONNECTOR FOR ICC UNIT

쐌

Disconnect connector of ICC unit, and check terminals for bend and looseness. Securely connect it again.

쐌

When ignition switch is ON, do all displays illuminate?

Yes or No

Yes

䊳

Perform self-diagnosis again.

䊳

GO TO 7.

CHECK METER COMMUNICATION

쐌

Perform self-diagnosis with CONSULT-II, and check meter communication system for malfunction.

OK or NG

䊳

Replace combination meter.

䊳

Meter communication inspection. Refer to “DTC 48 METER CIRCUIT” EL-336.

IDX

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis - General Description (Cont’d)

EL-319

Trouble Diagnosis For Self-diagnostic Items

NBEL0468

DIAGNOSTIC TROUBLE CODE (DTC) CHART

NBEL0468S01

:Applicable

DTC No.

CONSULT-II screen terms

ICC system

warning lamp

Fail-safe

Malfunctions detected where...

Refer-

ence
page

CONTROL UNIT

쐌

ICC unit internal malfunction

EL-322

CAN COMM CIRCUIT

쐌

ICC unit detected CAN commu-
nication malfunction.

EL-322

POWER SUPPLY CIR1

쐌

ICC unit power supply voltage is
excessively low.

EL-324

POWER SUPPLY CIR2

쐌

ICC unit power supply voltage is
excessively high.

EL-324

VHCL SPEED SE CIRC

쐌

Vehicle speed sensor signal har-
ness is open or shorted

쐌

Combination meter malfunction

EL-325

THRTL POS SEN CIRC

쐌

Throttle position sensor and
throttle position switch harness
is open or shorted.

쐌

Throttle position sensor input is
HI or fixed to LO.

쐌

Throttle position switch is ON or
stuck to OFF.

EL-327

ABS/TCS/VDC CIRC

쐌

ABS system malfunction

쐌

ABS operation signal harness is
opened.

EL-331

BRAKE SW/ STOP L SW

쐌

Brake and stop lamp switch har-
ness is open or shorted.

쐌

Brake and stop lamp switch is
ON or stuck to OFF.

쐌

Brake and stop lamp switch is
stuck to ON.

EL-333

OPERATION SW CIRC

쐌

ICC steering switch harness or
spiral cable is open or shorted.

쐌

ICC steering switch malfunction

EL-335

METER CIRCUIT

쐌

Combination meter communica-
tion harness is open or shorted.

쐌

Combination meter malfunction

쐌

ICC unit malfunction

EL-336

PRESS SEN CIRCUIT

쐌

Brake pressure sensor harness
is open or shorted.

쐌

Brake pressure sensor malfunc-
tion

쐌

Brake pressure sensor input cir-
cuit malfunction

EL-338

BOOSTER SOL/V CIRCUIT

쐌

Solenoid harness is open or
shorted.

쐌

Solenoid is open.

쐌

Solenoid drive circuit malfunc-
tion

EL-340

RELEASE SW CIRCUIT

쐌

Release switch harness is open
or shorted.

쐌

Release switch malfunction

쐌

Release switch input circuit mal-
function

EL-341

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis For Self-diagnostic Items

EL-320

DTC No.

CONSULT-II screen terms

ICC system

warning lamp

Fail-safe

Malfunctions detected where...

Refer-

ence
page

PRESSURE CONTROL

쐌

Booster malfunction

EL-343

LASER BEAM OFF CNTR

Laser beam of ICC sensor is off
the aiming point.

EL-344

POWER SUPPLY VALVE
[HI VOLTAGE]

쐌

Power supply relay to vacuum
pump, air valve, and release
valve in ICC unit is stuck closed.

쐌

Power supply wire to release
valve is shorted to power sup-
ply.

EL-344

POWER SUPPLY VALVE
[HI VOLTAGE]

쐌

Vacuum pump drive circuit in
ICC unit.

ICC unit

malfunc-

tion

POWER SUPPLY VALVE
[LOW VOLTAGE]

쐌

Vacuum pump drive circuit in
ICC unit is irregular condition.

쐌

Vacuum pump control line is
shorted to ground.

EL-346

AIR VALVE
[HI VOLTAGE]

쐌

Air valve drive circuit in ICC unit
is irregular condition.

ICC unit

malfunc-

tion

AIR VALVE
[LOW VOLTAGE]

쐌

Air valve drive circuit in ICC unit
is irregular condition.

쐌

Air valve control line is shorted
to ground.

EL-347

RELEASE VALVE
[HI VOLTAGE]

쐌

Release valve drive circuit in
ICC unit is irregular condition.

ICC unit

malfunc-

tion

RELEASE VALVE
[LOW VOLTAGE]

쐌

Release valve drive circuit in
ICC unit is irregular condition.

쐌

Power supply relay to vacuum
pump, air valve, and release
valve in ICC unit is stuck to
OFF.

쐌

Release valve control line is
shorted.

쐌

Power supply line to vacuum
pump, air valve, and release
valve is open.

EL-348

STOP LAMP RLY FIX

쐌

Normally open terminal of stop
lamp relay is stuck.

EL-349

102

RADAR STAIN

쐌

ICC sensor body window has
contamination.

EL-358

103

LASER SENSOR FAIL

쐌

ICC sensor internal malfunction

EL-359

104

LASER AIMING INCMP

쐌

Laser beam aiming of ICC sen-
sor is not adjusted.

EL-359

107

LASER COMM FAIL

쐌

CAN data received by ICC sen-
sor is strange (from ICC unit).

EL-359

109

LASER HIGH TEMP

쐌

Temperature around ICC sensor
is excessively high.

EL-359

IDX

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis For Self-diagnostic Items (Cont’d)

EL-321

DTC 11 CONTROL UNIT

NBEL0468S02

DIAGNOSTIC CHECK

1. Are any items other than “DTC 11 CONTROL UNIT” indicated on self-diagnosis display?

Yes or No

Yes

䊳

Repair or replace applicable item. Erase DTC and perform ICC system running test.
Then perform self-diagnosis of ICC system again.

䊳

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

DTC 20 CAN COMM CIRCUIT

NBEL0468S03

CHECK CAN COMMUNICATION

With CONSULT-II

1. Perform self-diagnosis.
2. Print self-diagnostic result.
3. Check “CAN DIAG SUPPORT MNTR” on data monitor.
CAN DIAG SUPPORT MNTR

MTBL1226

OK or NG

䊳

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

䊳

CAN COMM: NG

Replace ICC unit

CAN CIRC1: UNKWN

Replace ICC unit

CAN CIRC7: UNKWN

Replace ICC unit or ICC sensor

CAN CIRC8: UNKWN

Replace ICC unit or ICC sensor

CAN CIRC10: UNKWN

Replace ICC unit or ICC sensor

CAN CIRC11: UNKWN

Replace ICC sensor

When indicated CAN COMM: NG and CAN CIRC7 to 11 UNKWN (All) GO TO 2.

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis For Self-diagnostic Items (Cont’d)

EL-322

CHECK HARNESS FOR OPEN CIRCUIT 1

1. Disconnect ICC sensor connector.
2. Check resistance between ICC sensor harness connector E140 terminals 3 (P/B) and 6 (LG/B).

SEL541Y

Approx. 54 - 66

Ω

OK or NG

䊳

쐌

Replace ICC sensor.

쐌

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

䊳

GO TO 3.

CHECK HARNESS FOR OPEN CIRCUIT 2

1. Connect ICC sensor connector.
2. Disconnect ICC unit connector.
3. Check resistance between ICC unit harness connector B158 terminals 5 (B/P) and 14 (OR).

SEL542Y

Approx. 108 - 132

Ω

OK or NG

䊳

쐌

Replace ICC unit.

쐌

After replacing ICC unit, erase DTC, and perform ICC system running test. Then, per-
form self-diagnosis of ICC system again.

䊳

쐌

Check ICC resistor harness and connector between ICC unit and ICC sensor.

쐌

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

IDX

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis For Self-diagnostic Items (Cont’d)

EL-323

DTC 31 POWER SUPPLY CIR 1, DTC 34 POWER
SUPPLY CIR 2

NBEL0468S04

CHECK CONNECTOR 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

䊳

GO TO 2.

䊳

쐌

Poor connector connection

쐌

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

CHECK POWER SUPPLY CIRCUIT FOR ICC UNIT

1. Turn ignition switch ON.
2. Check voltage between ICC unit harness connector B159 terminal 33 (W/G), 42 (W/G) and ground.

SKIA1173E

Battery voltage should exist.

OK or NG

䊳

GO TO 3.

䊳

쐌

Repair ICC unit power supply harness.

쐌

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

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Trouble Diagnosis For Self-diagnostic Items (Cont’d)

EL-324

Infiniti QX4. Electrical System (2003 year). Manual - part 20