Infiniti Q45. Manual - part 12

TROUBLE DIAGNOSIS - GENERAL DESCRIPTION

ACS-41

[ICC]

C

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ACS

3. 

CHECK HARNESS BETWEEN ECM AND ICC STEERING SWITCH

1.

Turn ignition switch OFF.

2.

Disconnect ECM connector, and check terminals for bend and
looseness. 

3.

Check continuity between ECM harness connector terminals.

4.

Check continuity between ECM harness connector and ground.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4. 

4. 

CHECK ICC STEERING SWITCH

Check ICC steering switch. Refer to 

ACS-77, "ICC Steering Switch"

 .

OK or NG

OK

>> 1. Repair or replace harness between ECM and ICC steering switch.

2. Perform self-diagnosis mode for ICC system.

NG

>> 1. Replace ICC steering switch.

2. Perform self-diagnosis mode for ICC system.

5. 

CHECK SELF-DIAGNOSIS

1.

Connect ECM connector.

2.

Turn ignition switch ON.

3.

Perform self-diagnosis mode for ICC system.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 6.

6. 

CHECK CONNECTOR FOR ICC UNIT

1.

Turn ignition switch OFF.

2.

Disconnect ICC unit connector, and check terminals for bend and looseness. 

3.

Connect ICC unit connector.

4.

Turn ignition switch ON.

5.

Check if all displays illuminate.

Do all displays illuminate?

YES

>> Perform self-diagnosis again.

NO

>> GO TO 7.

ECM connector

Terminal

Condition

Resistance 

(Approx.)

F101

67

99

When MAIN switch pressed

0 

Ω

When MAIN switch released

5.5 k

Ω

PKIB8377E

ECM connector

Terminal

Ground

Continuity

F101

67

No

99

PKIB8378E

ACS-42

[ICC]

TROUBLE DIAGNOSIS - GENERAL DESCRIPTION

7. 

CHECK POWER SUPPLY CIRCUIT FOR ICC UNIT

Check voltage between ICC unit harness connector and ground.

OK or NG

OK

>> GO TO 8.

NG

>> Repair ICC unit power supply harness.

8. 

CHECK GROUND CIRCUIT FOR ICC UNIT

1.

Turn ignition switch OFF.

2.

Disconnect ICC unit connector.

3.

Check continuity between ICC unit harness connector and
ground.

OK or NG

OK

>> GO TO 9.

NG

>> Repair ICC unit ground harness.

9. 

CHECK DISPLAYS

1.

Connect ICC unit connector.

2.

Turn ignition switch ON.

3.

Check if all displays illuminate.

Do all displays illuminate?

YES

>> Perform self-diagnosis again.

NO

>> GO TO 10.

10. 

CHECK CAN COMMUNICATION

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

OK or NG

OK

>> Replace combination meter.

NG

>> CAN communication inspection. Refer to 

ACS-45, "DTC 20 CAN COMM CIRCUIT"

 .

Terminals

Voltage (Approx.)

(+)

(

−

)

ICC unit connector

Terminal

B244

33

Ground

Battery voltage

42

SKIA1173E

ICC unit connector

Terminal

Ground

Continuity

B243

19

Yes

20

B244

46

SKIA6650E

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

ACS-43

[ICC]

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TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

PFP:00000

Diagnostic Trouble Code (DTC) Chart

NKS001KE

×

: Applicable

DTC 

No.

CONSULT-II 

screen terms

ICC 

system 

warning 

lamp

Fail-safe

Malfunctions detected where...

Refer-

ence 
page

Vehicle-

to-

vehicle 

distance 

control 

mode

Conven-

tional 
(fixed 

speed) 

cruise 

control 

mode

Brake 
assist 

(with 

preview 

function)

11

CONTROL UNIT

×

×

×

×

●

ICC unit internal malfunction.

ACS-44

20

CAN COMM CIRCUIT

×

×

×

×

●

ICC unit detected CAN communi-
cation malfunction.

ACS-45

31

POWER SUPPLY CIR

×

×

×

×

●

ICC unit power supply voltage is 
excessively low (less than 8 V).

ACS-45

34

POWER SUPPLY CIR2

×

×

×

×

●

ICC unit power supply voltage is 
excessively high (more than 19 V).

ACS-45

41

VHCL SPEED SE CIRC

×

×

×

×

●

Wheel sensor malfunction.

●

VDC/TCS/ABS control unit mal-
function.

●

AT vehicle speed sensor malfunc-
tion.

●

TCM malfunction.

ACS-46

43

ABS/TCS/VDC CIRC

×

×

×

×

●

VDC/TCS/ABS system malfunc-
tion.

ACS-47

45

BRAKE SW/STOP L SW

×

×

×

×

●

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

●

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

●

Brake and stop lamp switch is 
stuck to ON.

ACS-47

46

OPERATION SW CIRC

×

×

×

●

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

●

ICC steering switch malfunction.

ACS-49

55

NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.

●

No malfunction item has been 
detected. 

—

61

PRESS SEN CIRCUIT

×

×

×

●

Brake pressure sensor harness is 
open or shorted.

●

Brake pressure sensor malfunc-
tion.

●

Brake pressure sensor input circuit 
malfunction.

ACS-51

62

BOOSTER SOL/V CIRCUIT

×

×

×

●

Solenoid harness is open or 
shorted.

●

Solenoid is open.

●

Solenoid drive circuit malfunction.

ACS-53

63

RELEASE SW CIRCUIT

×

×

×

×

●

Release switch harness is open or 
shorted.

●

Release switch malfunction.

●

Release switch input circuit mal-
function.

ACS-54

65

PRESSURE CONTROL

×

×

×

●

Booster malfunction.

ACS-55

ACS-44

[ICC]

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

DTC 11 CONTROL UNIT

NKS001KF

1. 

PERFORM ICC UNIT SELF-DIAGNOSIS

1.

Perform self-diagnosis.

2.

Check if any item other than “DTC 11 CONTROL UNIT” is indicated on self-diagnosis display.

Is any indicated?

YES

>> 1. Repair or replace applicable item.

2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system

again.

NO

>> 1. Replace ICC unit.

2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system

again.

74

LASER BEAM OFF CNTR

×

×

×

●

Laser beam of ICC sensor is off 
the aiming point.

ACS-56

90

STOP LAMP RLY FIX

×

×

×

●

Normally open terminal of stop 
lamp relay is stuck.

ACS-56

92

ECM CIRCUIT

×

×

×

×

●

ECM malfunction.

●

Accelerator pedal position sensor 
malfunction.

●

ICC unit malfunction.

ACS-62

96

NP RANGE

×

×

×

●

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

●

Park/neutral position switch mal-
function. 

●

TCM malfunction.

ACS-63

97 AT 

CIRCUIT

×

×

×

●

TCM malfunction.

ACS-65

98

GEAR POSITION

×

×

×

●

TCM malfunction.

●

AT turbine revolution sensor mal-
function.

●

AT vehicle speed sensor malfunc-
tion.

ACS-65

102

RADAR STAIN

×

×

×

●

ICC sensor body window has con-
tamination.

ACS-66

103

LASER SENSOR FAIL

×

×

×

●

ICC sensor internal malfunction.

ACS-66

104

LASER AIMING INCMP

×

×

×

●

Laser beam aiming of ICC sensor 
is not adjusted.

ACS-67

107

LASER COMM FAIL

×

×

×

●

CAN data received by ICC sensor 
is strange (from ICC unit, combi-
nation meter or ECM).

ACS-67

109

LASER HIGH TEMP

×

×

×

●

Temperature around ICC sensor is 
excessively high.

ACS-67

DTC 

No.

CONSULT-II 

screen terms

ICC 

system 

warning 

lamp

Fail-safe

Malfunctions detected where...

Refer-

ence 
page

Vehicle-

to-

vehicle 

distance 

control 

mode

Conven-

tional 
(fixed 

speed) 

cruise 

control 

mode

Brake 
assist 

(with 

preview 

function)