Infiniti F50. Manual — part 21

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

ACS-77

[ICC]

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ACS

DTC 61 PRESS SEN CIRCUIT

EKS005QF

1.

CHECK CONNECTOR BRAKE PRESSURE SENSOR AND ICC UNIT

1.

Turn ignition switch OFF.

2.

Disconnect connectors of brake pressure sensor and ICC unit, and connect them 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 HARNESS BETWEEN BRAKE PRESSURE SENSOR AND ICC UNIT

1.

Turn ignition switch OFF.

2.

Disconnect connectors of ICC unit and brake pressure sensor.

3.

Check continuity between ICC unit harness connector B243 ter-
minal 8 (P/U), 17 (B/Y), 24 (OR) and brake pressure sensor har-
ness connector E82 terminal 3 (P/U), 2 (B/Y), 1 (OR).

OK or NG

NG

>>

●

Repair harness between brake pressure sensor and
ICC unit

●

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

OK

>> GO TO 3.

3.

CHECK POWER SUPPLY CIRCUIT FOR BRAKE PRESSURE SENSOR

1.

Connect ICC unit.

2.

Turn ignition switch ON.

3.

Check voltage between ICC unit harness connector B243 termi-
nal 8 (P/U) and 24 (OR).

OK or NG

NG

>> Replace ICC unit. Clear DTC and perform driving check.

Then perform self-diagnosis of ICC system again.

OK

>>

●

Brake pressure sensor malfunction

●

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

DTC 62 BOOSTER SOL/V CIRCUIT

EKS003PJ

1.

CHECK SOLENOID/RELEASE SWITCH AND ICC UNIT CHECK CONNECTOR

1.

Turn ignition switch OFF.

2.

Disconnect connectors of brake booster solenoid/release and ICC unit, and connect them 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.

8 - 3, 17 - 2, 24 - 1

Continuity should exist.

SKIA1591E

8 (+) - 24 (–)

Approx. 5V

SKIA1268E

ACS-78

[ICC]

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

2.

CHECK HARNESS BETWEEN SOLENOID/RELEASE SWITCH AND ICC UNIT

1.

Turn ignition switch OFF.

2.

Disconnect ICC unit connector and brake booster solenoid
release switch connector.

3.

Check continuity between ICC unit harness connector B243 ter-
minal 10 (W/R), 12 (B/R) and brake booster harness connector
E81 terminal 4 (W/R), 6 (B/R).

OK or NG

NG

>>

●

Repair harness between brake booster solenoid/
release switch and ICC unit

●

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

OK

>> GO TO 3.

3.

CHECK BOOSTER SOLENOID

●

Check booster solenoid. Refer to

ACS-101, "Booster Solenoid"

.

OK or NG

NG

>>

●

Replace Booster solenoid

●

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

OK

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

of ICC system again.

DTC 63 RELEASE SW CIRCUIT

EKS003PK

1.

CHECK SOLENOID/RELEASE SWITCH AND ICC UNIT CHECK CONNECTOR

1.

Turn ignition switch OFF.

2.

Disconnect brake booster solenoid/release switch connector and ICC unit connector, and connect them
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.

10 - 4, 12 - 6

Continuity should exist.

SKIA1269E

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

ACS-79

[ICC]

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ACS

2.

CHECK HARNESS SOLENOID/RELEASE SWITCH AND ICC UNIT

1.

Turn ignition switch OFF.

2.

Disconnect brake booster solenoid/release switch connector
and ICC unit connector.

3.

Check continuity between ICC unit harness connector B243 ter-
minal 6 (L), 15 (P), 22 (R/B) and Brake booster harness connec-
tor E81 terminal 1 (L), 3 (P), 2 (R/B).

OK or NG

NG

>>

●

Repair harness between brake booster solenoid/
release switch and ICC unit

●

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

OK

>> GO TO 3.

3.

CHECK RELEASE SWITCH POWER SUPPLY CIRCUIT

●

Check voltage between ICC unit harness connector B243 termi-
nal 6 (L) and ground.

OK or NG

NG

>> Replace ICC unit. Erase DTC and perform ICC system

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

OK

>> GO TO 4.

4.

CHECK RELEASE SWITCH

●

Check release switch. Refer to

ACS-102, "Release Switch"

.

OK or NG

NG

>>

●

Release switch malfunction

●

Replace booster. Erase DTC and perform ICC system running test. Then perform self-diagno-
sis of ICC system again.

OK

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

of ICC system again.

DTC 65 PRESSURE CONTROL

EKS003PL

1.

OPERATION CHECK

●

Check foot brake pedal operates normally.

OK or NG

NG

>>

●

Check brake circuit.

●

After repair, Erase DTC, and perform active test (BOOSTER SOL/V3) with CONSULT-II. Then
perform self-diagnosis of ICC system again.

OK

>> GO TO 2.

6 - 1, 15 - 3, 22 - 2

Continuity should exist.

SKIA1183E

Approx. 10V

SKIA1184E

ACS-80

[ICC]

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

2.

CHECK BOOSTER SOLENOID

●

Check booster solenoid. Refer to

ACS-101, "Booster Solenoid"

.

OK or NG

NG

>>

●

Solenoid malfunction

●

Replace booster. Erase DTC and perform ICC system running test. Then perform self-diagno-
sis of ICC system again.

OK

>> GO TO 3.

3.

CHECK HARNESS BETWEEN SOLENOID/RELEASE SWITCH AND ICC UNIT

1.

Turn ignition switch OFF.

2.

Disconnect ICC unit connector and brake booster solenoid/
release switch connector.

3.

Check continuity between ICC unit harness connector B243 ter-
minal 10 (W/R), 12 (B/R) and brake booster solenoid/release
harness connector E81 terminal 4 (W/R), 6 (B/R).

OK or NG

NG

>>

●

Repair harness between brake booster solenoid/
release switch and ICC unit

●

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

OK

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

of ICC system again.

DTC 74 LASER BEAM OFF CNTR

EKS003PM

1.

DIAGNOSTIC CHECK

1.

Adjust laser beam aiming. Then erase DTC, and perform ICC system running test.

2.

After that, 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.

●

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

No

>> Inspection is completed.

DTC 81 POWER SUPPLY VALVE

EKS003PN

1.

CHECK ICC UNIT REFERENCE SIGNAL

1.

Start the engine.

2.

Turn ON/OFF switch ON.

3.

Check voltage between ICC unit harness connector B245 termi-
nal 57 (R) and ground.

OK or NG

NG

>> GO TO 2.

OK

>> GO TO 3.

10 - 4, 12 - 6

Continuity should exist.

SKIA1269E

Approx. 0V

SKIA1186E