Infiniti Q45 (FY33). Manual - part 92

SBR038EA

Diagnostic Procedure 5 (LAN SIGNAL 2: LAN
communication start procedures incomplete)

Code No. 85 of ABS/TCS control unit

Self-diagnostic item “LAN SIGNAL 2”
appears on display.

Is self-diagnosis for ECM able to start?

Yes

E

No

I

Repair or replace data
link connector for CON-
SULT-II-to-ECM harness
and connector.

I

Faulty ECM.
(Malfunction indicator
lamp remains “ON” dur-
ing operation or engine
does not operate at
speeds greater than
3,000 rpm.)

Does “ECM-ABSTCS COMM NG” (self-
diagnostic item) appear on display?

No

E

Yes

Check LAN circuit. Refer to
“LAN CIRCUIT CHECK”,
BR-84.

Is starter signal input to ECM?
Refer to “Start Signal”, “TROUBLE DIAG-
NOSES FOR NON-DETECTABLE ITEMS”
in EC section.

Yes

E

No

Repair or replace starter
switch system.

If other items appear on display, repair or
replace affected areas.

Repeat self-diagnostic procedures for
ABS/TCS control unit.

GI

MA

EM

LC

EC

FE

AT

PD

FA

RA

ST

RS

BT

HA

EL

IDX

TROUBLE DIAGNOSES FOR SELF-DIAGNOSTIC ITEMS

H

H

H

H

H

BR-85

SBR038EA

Diagnostic Procedure 6 (LAN CIRCUIT 1/LAN
CIRCUIT 2: LAN communication system failure)

Code No. 75 of ABS/TCS control unit

Self-diagnostic items “LAN CIRCUIT 1”
and “LAN CIRCUIT 2” appear on display.

I

Perform self-diagnostic procedures for
ECM.

I

Does “ECM-ABSTCS COMM NG” (self-
diagnostic item) appear on display?

No

E

Yes

Check LAN circuit.
Refer to LAN CIRCUIT
CHECK, BR-84.

Check ECM-to-battery power circuits, har-
nesses and connectors. Refer to “Main
Power Supply and Ground Circuit”,
“TROUBLE DIAGNOSIS FOR POWER
SUPPLY” in EC section.

OK

E

NG

Repair or replace affected
parts.

Repeat self-diagnostic procedures for
ABS/TCS control unit.

E

NG

Faulty ABS/TCS control
unit.

TROUBLE DIAGNOSES FOR SELF-DIAGNOSTIC ITEMS

H

H

H

BR-86

SBR369E

Diagnostic Procedure 7 (Wheel sensor or rotor)

Code No. 21, 22, 25, 26, 31, 32, 35, 36 of ABS/TCS
control unit

SBR370E

SBR651D

1. Disconnect connectors from ABS/TCS

control unit and wheel sensor of mal-
function code No. Check terminals for
damage or loose connections. Then
reconnect connectors.

2. Carry out self-diagnosis again.

Does warning lamp activate again?

Yes

E

No

Inspection end

WHEEL SENSOR ELECTRICAL CHECK

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

1. Disconnect ABS/TCS control unit con-

nector.

2. Check resistance between ABS/TCS

control unit connector

B103

terminals.

Code No. 25 or 26 (Front LH wheel)
Terminals

q

3

and

q

19

Code No. 21 or 22 (Front RH wheel)
Terminals

q

1

and

q

17

Code No. 31 or 32 (Rear LH wheel)
Terminals

q

4

and

q

20

Code No. 35 or 36 (Rear RH wheel)
Terminals

q

2

and

q

18

Resistance: 0.9 - 1.1 k

Ω

NG

E

OK

q

A

(See next page.)

CHECK WHEEL SENSOR.

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Check each sensor for resistance.
Resistance: 0.9 - 1.1 k

Ω

NG

E

OK

Check the following.

I

Harness connectors

B103

,

E45

,

F11

,

B112

I

Harness for open or
short between wheel
sensor connectors and
ABS/TCS control unit

If NG, repair harness or
connectors.

Replace wheel sensor.

GI

MA

EM

LC

EC

FE

AT

PD

FA

RA

ST

RS

BT

HA

EL

IDX

TROUBLE DIAGNOSES FOR SELF-DIAGNOSTIC ITEMS

H

H

H

BR-87

SBR763D

SBR778A

q

A

WHEEL SENSOR MECHANICAL CHECK

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Check for any foreign materials and clear-
ance between sensor and rotor.
Clearance:

Front

Make sure the sensor is installed
with minimum clearance.

Rear

0.34 - 0.89 mm
(0.0134 - 0.0350 in)

OK

E

NG

Clean sensor fixing portion,
reinstall or replace sensor.

Check sensor rotor for teeth damage.

OK

E

NG

Replace sensor rotor.

Check ABS/TCS control unit pin terminals
for damage or the connection of control
unit harness connector.
Reconnect ABS/TCS control unit harness
connector. Then retest.

TROUBLE DIAGNOSES FOR SELF-DIAGNOSTIC ITEMS

Diagnostic Procedure 7 (Wheel sensor or rotor)
(Cont’d)

H

H

H

BR-88