Infiniti M45 (Y34). Manual - part 19

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

ACS-69

[ICC]

C

D

E

F

G

H

I

J

L

M

A

B

ACS

63

RELEASE SW CIRCUIT

×

×

×

×

●

Release switch harness is open 
or shorted.

●

Release switch malfunction

●

Release switch input circuit mal-
function

ACS-78

65

PRESSURE CONTROL

×

×

×

×

●

Booster malfunction

ACS-79

74

LASER BEAM OFF CNTR

×

×

×

●

Laser beam of ICC sensor is off 
the aiming point.

ACS-80

81

POWER SUPPLY VALVE
[HI VOLTAGE]

×

×

×

●

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

●

Power supply wire to release 
valve is shorted to power supply.

ACS-80

82

VACUUM PUMP
[HI VOLTAGE]

×

×

×

●

Vacuum pump drive circuit in ICC 
unit.

ICC unit 

malfunc-

tion

83

VACUUM PUMP
[LOW VOLTAGE]

×

×

×

●

Vacuum pump drive circuit in ICC 
unit is irregular condition.

●

Vacuum pump control line is 
shorted to ground.

ACS-81

84

AIR VALVE
[HI VOLTAGE]

×

×

×

●

Air valve drive circuit in ICC unit 
is irregular condition.

ICC unit 

malfunc-

tion

85

AIR VALVE
[LOW VOLTAGE]

×

×

×

●

Air valve drive circuit in ICC unit 
is irregular condition.

●

Air valve control line is shorted to 
ground.

ACS-82

86

RELEASE VALVE
[HI VOLTAGE]

×

×

×

●

Release valve drive circuit in ICC 
unit is irregular condition.

ICC unit 

malfunc-

tion

87

RELEASE VALVE
[LOW VOLTAGE]

×

×

×

●

Release valve drive circuit in ICC 
unit is irregular condition.

●

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

●

Release valve control line is 
shorted.

●

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

ACS-82

90

STOP LAMP RLY FIX

×

×

×

×

●

Normally open terminal of stop 
lamp relay is stuck.

ACS-83

92

ECM CIRCUIT

×

×

×

×

●

ECM malfunction

●

Throttle position sensor malfunc-
tion

●

ICC unit malfunction

ACS-88

97

AT CIRCUIT

×

×

×

●

TCM malfunction

ACS-88

DTC 

No.

CONSULT-II screen terms

ICC 

system 

warn-

ing 

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)

ACS-70

[ICC]

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

DTC 11 CONTROL UNIT

AKS002QE

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

of ICC system again.

DTC 20 CAN COMM CIRCUIT

AKS002QF

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-21, "CAN Communication

Unit"

 .

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

AKS002QG

1. 

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

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.

98

GEAR POSITION

×

×

×

●

TCM malfunction

●

AT turbine revolution sensor mal-
function

●

AT vehicle speed sensor mal-
function

ACS-88

102

RADAR STAIN

×

×

×

●

ICC sensor body window has 
contamination.

ACS-89

103

LASER SENSOR FAIL

×

×

×

●

ICC sensor internal malfunction

ACS-90

104

LASER AIMING INCMP

×

×

×

●

Laser beam aiming of ICC sensor 
is not adjusted.

ACS-90

107

LASER COMM FAIL

×

×

×

●

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

ACS-90

109

LASER HIGH TEMP

×

×

×

●

Temperature around ICC sensor 
is excessively high.

ACS-91

DTC 

No.

CONSULT-II screen terms

ICC 

system 

warn-

ing 

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)

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

ACS-71

[ICC]

C

D

E

F

G

H

I

J

L

M

A

B

ACS

2. 

CHECK POWER SUPPLY CIRCUIT FOR ICC UNIT

1.

Turn ignition switch ON.

2.

Check voltage between ICC unit harness connector B244 termi-
nal 33 (W/G), 42 (W/G) 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.

3. 

CHECK GROUND CIRCUIT FOR ICC UNIT

1.

Turn ignition switch OFF.

2.

Disconnect ICC unit connector.

3.

Check continuity between ICC unit harness connector B243 ter-
minal 19 (B), 20 (B), B244 terminal 46 (B) and ground.

OK or NG

OK

>> After replacing ICC unit, erase DTC, and perform ICC

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

NG

>>

●

Repair ICC unit ground harness.

●

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

DTC 41 VHCL SPEED SE CIRC

AKS002QH

1. 

ICC UNIT SELF-DIAGNOSIS CHECK

1.

Perform self-diagnosis. Is “DTC 43 ABS/TCS/VDC CIRC” or “DTC 20 CAN COMM CIRCUIT” indicated in
self-diagnosis item 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

>> GO TO 2

2. 

CHECK AT VEHICLE SPEED SENSOR

 With CONSULT-II

●

With data monitor, check “VHCL SPD AT”operate normally. Refer to 

ACS-60, "DATA MONITOR"

 .

OK or NG

OK

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

of ICC system again.

NG

>>

●

Check TCM.

●

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

Battery voltage should exist. (more than 8V)

SKIA1173E

Continuity should exist.

SKIA1174E

ACS-72

[ICC]

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

DTC 42 THRTL POS SEN CIRC

AKS002QI

1. 

CHECK CONNECTOR FOR 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

OK

>>

●

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

NG

>> GO TO 2.

2. 

CHECK THROTTLE POSITION SENSOR AND IDLE SWITCH

 With CONSULT-II

●

With data monitor, check that “THRTL SENSOR” and “IDLE SW” switches operate normally. Refer to

ACS-60, "DATA MONITOR"

 .

OK or NG

OK

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

of ICC system again.

NG

>> GO TO 3.

3. 

CHECK THROTTLE POSITION SIGNAL FOR ICC UNIT

●

Check voltage between ICC unit harness connector B245 termi-
nal 69 (R/Y) and 68 (B).

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4. 

CHECK HARNESS BETWEEN ICC UNIT AND ECM

1.

Turn ignition switch OFF.

2.

Disconnect connectors of ICC unit and ECM.

3.

Check continuity between ICC unit harness connector B245 ter-
minal 69 (R/Y) and ECM harness connector F102 terminal 113
(R/Y).

4.

Check continuity between ICC unit harness connector B245 ter-
minal 69 (R/Y) and ground.

OK or NG

OK

>>

●

Check ECM.

●

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

NG

>>

●

Repair harness between ICC unit and ECM

●

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

Approx 0.5V (Throttle full closed)

Approx 4.0V (Throttle full open)

SKIA1177E

Continuity should exist.

Continuity should not exist.

SKIA1178E