Infiniti QX56 (Z62). Manual — part 951

MWI-58

< BASIC INSPECTION >

DIAGNOSIS AND REPAIR WORKFLOW (METER SYSTEM)

• Check the symptom based on the information obtained from the customer.
• Check that any other malfunctions are present.

>> GO TO 3.

3.

CHECK ON BOARD DIAGNOSIS OPERATION

Check that the on board diagnosis function operates. Refer to

MWI-29, "On Board Diagnosis Function"

.

Does the on board diagnosis function operate normally?

YES

>> GO TO 4.

NO

>> GO TO 6.

4.

CHECK CONSULT-III SELF-DIAGNOSIS RESULTS

Connect CONSULT-III and perform self-diagnosis. Refer to

MWI-30, "CONSULT-III Function"

.

Are self-diagnosis results normal?

YES

>> GO TO 5.

NO

>> GO TO 8.

5.

NARROW DOWN THE MALFUNCTIONING PARTS BY SYMPTOM DIAGNOSIS

Perform symptom diagnosis and narrow down the malfunctioning parts.

>> GO TO 8.

6.

CHECK COMBINATION METER POWER SUPPLY AND GROUND CIRCUITS

Check combination meter power supply and ground circuits. Refer to

MWI-64, "COMBINATION METER :

Diagnosis Procedure"

.

Is inspection result OK?

YES

>> GO TO 7.

NO

>> GO TO 8.

7.

REPLACE COMBINATION METER

Replace combination meter.

>> GO TO 9.

8.

REPAIR OR REPLACE MALFUNCTIONING PARTS

Repair or replace the malfunctioning parts.
NOTE:
If DTC is displayed, erase DTC after repair or replace malfunctioning parts.

>> GO TO 9.

9.

FINAL CHECK

Check that the combination meter operates normally.

Do they operate normally?

YES

>> INSPECTION END

NO

>> GO TO 1.

MWI

U1000 CAN COMM CIRCUIT

MWI-59

< DTC/CIRCUIT DIAGNOSIS >

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DTC/CIRCUIT DIAGNOSIS

U1000 CAN COMM CIRCUIT

Description

INFOID:0000000006221728

CAN (Controller Area Network) is a serial communication system for real time application. It is an on-vehicle
multiplex communication system with high data communication speed and excellent error detectability. Many
electronic control units are equipped onto vehicles, and each control unit shares information and links with
other control units during operation (not independent). In CAN communication, control units are connected
with two communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with
less wiring. Each control unit transmits/receives data but selectively reads required data only.
CAN Communication Signal Chart. Refer to

LAN-28, "CAN COMMUNICATION SYSTEM : CAN Communica-

tion Signal Chart"

.

DTC Logic

INFOID:0000000006221729

DTC DETECTION LOGIC

Diagnosis Procedure

INFOID:0000000006221730

1.

PERFORM SELF DIAGNOSTIC

1.

Turn ignition switch ON and wait for 2 seconds or more.

2.

Check “Self Diagnostic Result” of “METER/M&A”.

Is “CAN COMM CIRCUIT” displayed?

YES

>> Refer to

LAN-18, "Trouble Diagnosis Flow Chart"

.

NO

>> Refer to

GI-40, "Intermittent Incident"

.

DTC

Display contents of

CONSULT-III

Diagnostic item is detected when...

Probable malfunction location

U1000

CAN COMM CIRCUIT

When combination meter is not transmitting or
receiving CAN communication signal for 2
seconds or more.

CAN communication system

MWI-60

< DTC/CIRCUIT DIAGNOSIS >

U1010 CONTROL UNIT (CAN)

U1010 CONTROL UNIT (CAN)

Description

INFOID:0000000006221731

Initial diagnosis of combination meter.

DTC Logic

INFOID:0000000006221732

DTC DETECTION LOGIC

Diagnosis Procedure

INFOID:0000000006221733

1.

REPLACE COMBINATION METER

When DTC “U1010” is detected, replace combination meter.

>> INSPECTION END

DTC

Display contents of CON-

SULT-III

Diagnostic item is detected when...

Probable malfunction location

U1010

CONTROL UNIT (CAN)

When detecting error during the initial diagno-
sis of the CAN controller of combination
meter.

Combination meter

MWI

B2205 VEHICLE SPEED

MWI-61

< DTC/CIRCUIT DIAGNOSIS >

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B2205 VEHICLE SPEED

Description

INFOID:0000000006221734

Vehicle speed signal is transmitted from ABS actuator and electric unit (control unit) via CAN communication
to combination meter.

DTC Logic

INFOID:0000000006221735

DTC DETECTION LOGIC

Diagnosis Procedure

INFOID:0000000006221736

1.

PERFORM SELF-DIAGNOSIS OF ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

Perform “Self Diagnostic Result” of ABS actuator and electric unit (control unit), and repair or replace malfunc-
tioning parts.

>> Refer to

BRC-51, "DTC Index"

.

DTC

Display contents of

CONSULT-III

Diagnostic item is detected when...

Probable malfunction location

B2205

VEHICLE SPEED

An abnormal vehicle speed signal is input
from ABS actuator and electric unit (control
unit) for 2 seconds or more

• Wheel sensor
• ABS actuator and electric unit (control unit)