2005 INFINITI QX4 ignition

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
ACS-43
[ICC]
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DTC 74 LASER BEAM OFF CNTREKS00BM8
1. DIAGNOSTIC CHECK
1. Adjust laser beam aiming. Refer to ACS-12, "
LASER BEAM AIMING ADJUSTMENT" . Erase DTC and
perform ICC system running test. Refer to ACS-9, "
ICC System Running Test" .
2. Perform self-diagnosis of ICC system. Is DTC 74 LASER BEAM OFF CNTR indicated?
YES or NO
YES >>
Replace ICC sensor and adjust laser beam aiming. Refer to ACS-60, "ICC Sensor" .

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 >> Inspection end.
DTC 90 STOP LAMP RLY FIXEKS00BM9
1. CHECK ICC UNIT CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect and check ICC unit connector.
OK or NG
OK >> GO TO 2.
NG >>

Connector malfunction.

Erase DTC and perform ICC system running test. Refer to ACS-9, "ICC System Running Test"
. Then perform self-diagnosis of system.
2. CHECK STOP LAMP SWITCH AND ICC BRAKE SWITCH
With CONSULT-II
1. Connect ICC unit connector and turn ignition switch ON.
2. With data monitor, check that “STOP LAMP SW” and “BRAKE SW” operate normally.
OK or NG
OK >> GO TO 11.
NG >>

BRAKE SW: GO TO 3.

STOP LAMP SW: GO TO 8.
3. CHECK AND ADJUST ICC BRAKE SWITCH
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. Refer to ACS-9, "
ICC System
Running Test" . Then perform self-diagnosis of ICC system again.
4. CHECK ICC BRAKE SWITCH
Check ICC brake switch. Refer to ACS-59, "
ICC Brake Switch and Stop Lamp Switch" .
OK or NG
OK >> GO TO 5.
NG >> Replace ICC brake switch. Erase DTC and perform ICC system running test. Refer to ACS-9,
"ICC System Running Test" . Then perform self-diagnosis of ICC system again.

ACS-44
[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Revision: October 20052005 QX56
5. CHECK ICC BRAKE HOLD RELAY
Disconnect ICC brake hold relay, and check continuity between ICC
brake hold relay terminal 4 and terminal 3.
OK or NG
OK >> GO TO 6.
NG >> Replace ICC brake hold relay. Erase DTC and perform
ICC system running test. Refer to ACS-9, "
ICC System
Running Test" . Then perform self-diagnosis of ICC sys-
tem again.
6. CHECK HARNESS THROUGH ICC BRAKE HOLD RELAY, ICC BRAKE SWITCH, ICC UNIT
1. Disconnect ICC brake hold relay, ECM and ICC unit harness connectors.
2. Check continuity between ICC brake hold relay harness connec-
tor E134 terminal 4 (L) and ICC unit harness connector B17 ter-
minal 29 (BR/W).
3. Check continuity between ICC unit harness connector B17 ter-
minal 29 (BR/W) and ground.
OK or NG
OK >> GO TO 7.
NG >>

Repair harness between ICC brake hold relay and
ICC brake switch.

Repair harness between ICC brake switch and 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.
7. CHECK ICC BRAKE HOLD RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch ON.
2. Check voltage between ICC brake hold relay harness connector
E134 terminal 3 (R/B) and ground.
OK or NG
OK >> Replace ICC unit. Refer to ACS-60, "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.
NG >>

Check fuse or ICC brake hold relay power supply sys-
tem harness.

Erase DTC and perform ICC system running test. Refer to ACS-9, "ICC System Running Test"
. Then perform self-diagnosis of ICC system again. Continuity should exist.
SKIA6658E
Continuity should exist.
Continuity should not exist.
WKIA1929E
Battery voltage should exist
WKIA3618E

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
ACS-45
[ICC]
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ACS
Revision: October 20052005 QX56
8. CHECK STOP LAMP SWITCH
1. Turn ignition switch OFF.
2. Check stop lamp switch. Refer to ACS-59, "
ICC Brake Switch and Stop Lamp Switch" .
OK or NG
OK >> GO TO 9.
NG >> Replace stop lamp switch. Erase DTC and perform ICC system running test. Refer to ACS-9,
"ICC System Running Test" . Then perform self-diagnosis of ICC system again.
9. CHECK ICC BRAKE HOLD RELAY CIRCUIT
1. Disconnect stop lamp switch connector.
2. When brake pedal is not depressed, make sure that stop lamp does not illuminate.
OK or NG
OK >> Replace ICC unit. Refer to ACS-60, "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.
NG >> GO TO 10.
10. CHECK ICC BRAKE HOLD RELAY
1. Disconnect ICC brake hold relay.
2. Check continuity between ICC brake hold relay E134 terminal 7
and terminal 6.
OK or NG
OK >> Replace ICC unit. Refer to ACS-60, "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.
NG >> Replace ICC brake hold relay. Erase DTC and perform
ICC system running test. Refer to ACS-9, "
ICC System
Running Test" . Then perform self-diagnosis of ICC system again. Continuity should not exist.
SKIA6659E

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
ACS-47
[ICC]
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14. CHECK ICC BRAKE HOLD RELAY POWER SUPPLY CIRCUIT
Check voltage between ICC brake hold relay harness connector
E134 terminal 6 (R/Y) and ground.
OK or NG
OK >> GO TO 15.
NG >>

Check fuse or ICC brake hold relay power supply har-
ness.

Erase DTC and perform ICC system running test.
Refer to ACS-9, "
ICC System Running Test" . Then
perform self-diagnosis of ICC system again.
15. CHECK HARNESS BETWEEN ICC BRAKE HOLD RELAY AND ICC UNIT
1. Turn ignition switch OFF.
2. Disconnect ICC brake hold relay and ICC unit harness connec-
tors.
3. Check continuity between ICC brake hold relay harness connec-
tor E134 terminal 7 (R/G) and ICC unit harness connector B17
terminal 38 (R/G).
4. Check continuity between ICC unit harness connector B17 ter-
minal 38 (R/G) and ground.
OK or NG
OK >> GO TO 16.
NG >>

Repair harness between ICC brake hold relay and ICC unit or between ICC brake hold relay
and stop lamp switch.

Erase DTC and perform ICC system running test. Refer to ACS-9, "ICC System Running Test"
. Then perform self-diagnosis of ICC system again.
16. CHECK ICC BRAKE HOLD RELAY
With CONSULT-II
1. Connect ICC unit and ICC brake hold relay harness connectors.
2. Disconnect stop lamp switch connector.
3. Perform active test (STOP LAMP) with CONSULT-II, and make sure that stop lamps are illuminated.
OK or NG
OK >> GO TO 17.
NG >> Replace ICC brake hold relay. Erase DTC and perform ICC system running test. Refer to ACS-9,
"ICC System Running Test" . Then perform self-diagnosis of ICC system again. 6 - Ground Battery voltage should exist
WKIA1931E
7 - 38 Continuity should exist.
38 - Ground Continuity should not exist.
WKIA1932E

ACS-48
[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Revision: October 20052005 QX56
17. CHECK ICC UNIT STANDARD VOLTAGE
With CONSULT-II
1. Connect stop lamp switch connector.
2. While performing active test (STOP LAMP: STP LMP DRIVE
ON) with CONSULT-II, check voltage between ICC unit harness
connector B17 terminal 29 (BR/W) and ground.
OK or NG
OK >> Replace ICC unit. Refer to ACS-60, "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.
NG >> Replace stop lamp switch. 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 92 ECM CIRCUITEKS00BMA
1. DIAGNOSIS CHECK 1
With CONSULT-II
Perform self-diagnosis with CONSULT-II. Is “CAN COMM CIRCUIT” 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. DIAGNOSIS CHECK 2
With CONSULT-II
Perform ECM self-diagnosis with CONSULT-II. 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 >> Replace ICC unit. Refer to ACS-60, "
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 96 NP RANGEEKS00BMB
1. CHECK ICC UNIT CONNECTORS
1. Turn ignition switch OFF.
2. Disconnect ICC unit harness connectors and connect them securely again. Erase DTC, then perform self-
diagnosis 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 termi-
nals. If any malfunction is detected, repair 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. 29 - Ground Approx. 0V (during active test)
SKIA1200E

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
ACS-49
[ICC]
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2. CHECK NP RANGE SWITCH SIGNAL
With CONSULT-II
With data monitor, check that “NP RANGE SW” operates normally.
OK or NG
OK >> Perform TCM diagnosis. Refer to AT-85, "SELF-DIAGNOSTIC RESULT MODE" .
NG >> GO TO 3.
3. CHECK HARNESS BETWEEN ICC UNIT AND TCM
1. Turn ignition switch OFF.
2. Disconnect ICC unit harness connectors and A/T assembly har-
ness connector.
3. Check continuity between ICC unit harness connector B13 ter-
minal 7 (B/R) and A/T assembly harness connector F9 terminal
9 (B/R).
OK or NG
OK >> Replace ICC unit. Refer to ACS-60, "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.
NG >>

Repair harness between ICC unit and TCM.

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 97 AT CIRCUITEKS00BMC
1. CHECK A/T CIRCUIT
With CONSULT-II
With TCM diagnosis, check that shift operates normally. Refer to AT-104, "
DTC P0705 PARK/NEUTRAL
POSITION SWITCH" .
OK or NG
OK >> Replace ICC unit. Refer to ACS-60, "ICC Unit" . Erase DTC and perform self-diagnosis of ICC
system again.
NG >>

Perform TCM diagnosis.

Erase DTC and perform self-diagnosis of ICC system again.
DTC 98 GEAR POSITIONEKS00BMD
1. DIAGNOSTIC CHECK
With CONSULT-II
Is “DTC 43 VDC/TCS/ABS CIRC” or “DTC 41 VHCL SPEED SE CIRC” indicated in self-diagnosis display
item?
YES or NO
YES >> Repair or replace as necessary. Erase DTC and perform self-diagnosis of ICC system again.
NO >> GO TO 2.
2. CHECK VEHICLE SPEED SIGNAL
With CONSULT-II
With data monitor, check that “VHCL SPEED SE” is normal.
OK or NG
OK >> GO TO 3.
NG >> Replace ICC unit. Refer to ACS-60, "
ICC Unit" . Erase DTC and perform self-diagnosis of ICC
system again.
7 - 9 Continuity should exist.
SKIA5982E

ACS-54
[ICC]
TROUBLE DIAGNOSIS FOR SYMPTOMS
Revision: October 20052005 QX56
Symptom 1: ON/OFF Switch Does Not Switch ON*1 , ON/OFF Switch Does Not
Switch OFF
*2EKS00BMK
NOTE:

*1: The ICC system display in the combination meter does not illuminate.

*2: The ICC system display in the combination meter remains powered.
1. CHECK ON/OFF SWITCH
With CONSULT-II

With "DATA MONITOR" on the CONSULT-II, check that ON/OFF switch operates normally.
OK or NG
OK >> GO TO 2.
NG >> GO TO 3.
2. CHECK ICC UNIT CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect ICC unit harness connectors.
3. Check connector housing for disconnected, loose, bent, and collapsed terminals.
OK or NG
OK >> GO TO 3.
NG >>

Poor connector connection.

Repair ICC unit connector. Erase DTC and perform ICC system running test. Refer to ACS-9,
"ICC System Running Test" . Then perform self-diagnosis of ICC system again.
3. DIAGNOSIS CHECK
With CONSULT-II

Perform self-diagnosis with CONSULT-II. Is “CAN COMM CIRCUIT” indicated?
YES or NO
YES >> Refer to ACS-38, "DTC 20 CAN COMM CIRCUIT" .
NO >> Refer to ACS-41, "
DTC 46 OPERATION SW CIRC" .
Symptom 2: The ICC System Cannot Be Set (ON/OFF Switch Turns On/Off)EKS00BML
The ICC cannot be set in the following cases.

When the vehicle speed is not in range of approx. 40 km/h (25 MPH) to 144 km/h (89 MPH).

When the selector lever is in "N".

While the brake is in operation.

When the windshield wipers are operating.
1. CHECK CAUSE OF AUTOMATIC CANCELLATION
With CONSULT-II
1. With “CAUSE OF AUTO-CANCEL” in "WORK SUPPORT" on CONSULT-II, check if any cause of cancel-
lation exists.
OK or NG
OK >>
Cancel with appropriate cause.

For causes A, B, or C, go to specified diagnosis.
A: “OPE SW VOLT CIRC” : Refer to ACS-41, "
DTC 46 OPERATION SW CIRC" .
B: “VHCL SPD UNMATCH” : Refer to ACS-39, "
DTC 41 VHCL SPEED SE CIRC" .
C: “IGN LOW VOLT” : Refer to ACS-38, "
DTC 31 POWER SUPPLY CIR1, DTC 34
POWER SUPPLY CIR2" .
NG >> GO TO 2.

TROUBLE DIAGNOSIS FOR SYMPTOMS
ACS-57
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Revision: October 20052005 QX56
2. CAN COMMUNICATION INSPECTION
With CONSULT-II
1. With CONSULT-II self-diagnosis, check “CAN COMM CIRCUIT”.
OK or NG
OK >> Refer to ACS-38, "DTC 20 CAN COMM CIRCUIT" .
NG >> Replace combination meter. Refer to IP-13, "
Combination Meter" . Erase DTC and perform ICC
system running test. Refer to ACS-9, "
ICC System Running Test" . Then perform self-diagnosis of
ICC system again.
Symptom 6: Driving Force Is HuntingEKS00BMP
1. CHECK ECM
1. Perform self-diagnosis of ECM.
OK or NG
OK >> Refer to ACS-57, "Symptom 7: The ICC System Frequently Cannot Detect the Vehicle Ahead/The
Detection Zone is Short" .
NG >> Repair 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.
Symptom 7: The ICC System Frequently Cannot Detect the Vehicle Ahead/The
Detection Zone is Short
EKS00BMQ
The detection function may become unstable in the following cases:

When the reflector of the vehicle ahead is small or not clean enough to reflect the laser.

When driving a road with extremely sharp corners.

When the laser 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. Refer to ACS-9, "
ICC System Running Test" .
NG >> GO TO 2.
2. CHECK FUNCTION
1. After performing laser beam aiming adjustment, perform ICC system running test. Refer to ACS-9, "
ICC
System Running Test" . Check that preceding vehicle detection performance has been improved.
OK or NG
OK >> Inspection End.
NG >>

Replace ICC sensor and perform laser beam aiming adjustment. Refer to ACS-60, "ICC Sen-
sor" .

Perform ICC system running test. Refer to ACS-9, "ICC System Running Test" . Then perform
self-diagnosis of ICC system again.
Symptom 8: The System Does Not Detect the Vehicle Ahead at AllEKS00BMR
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 combination meter. Refer to DI-17, "
How to Proceed With Trouble Diagnosis" .