Infiniti EX35. Manual - part 1284

SEC-32

< COMPONENT DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

U1000 CAN COMM CIRCUIT

COMPONENT DIAGNOSIS

U1000 CAN COMM CIRCUIT

BCM

BCM : Description

INFOID:0000000003586492

CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Modern
vehicle is equipped with many electronic control unit, and each control unit shares information and links with
other control units during operation (not independent). In CAN communication, control units are connected
with 2 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-27, "CAN Communication Signal Chart"

.

BCM : DTC Logic

INFOID:0000000003586493

DTC DETECTION LOGIC

BCM : Diagnosis Procedure

INFOID:0000000003586494

1.

PERFORM SELF DIAGNOSTIC

1.

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

2.

Check “Self Diagnostic Result”.

Is “U1000: CAN COMM CIRCUIT” displayed?

YES

>> Refer to 

LAN-18, "Trouble Diagnosis Flow Chart"

.

NO

>> Refer to 

GI-38, "Intermittent Incident"

.

IPDM E/R

IPDM E/R : Description

INFOID:0000000003586756

CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Modern
vehicle is equipped with many electronic control unit, and each control unit shares information and links with
other control units during operation (not independent). In CAN communication, control units are connected
with 2 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-27, "CAN Communication Signal Chart"

.

IPDM E/R : DTC Logic

INFOID:0000000003586757

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

DTC

CONSULT-III display 

description

DTC Detection Condition

Possible cause

U1000

CAN COMM CIRCUIT

When BCM cannot communicate CAN com-
munication signal continuously for 2 seconds 
or more.

CAN communication system

DTC

CONSULT-III display 

description

DTC Detection Condition

Possible cause

U1000

CAN COMM CIRCUIT

When IPDM E/R cannot communicate CAN 
communication signal continuously for 2 
seconds or more

CAN communication system

U1000 CAN COMM CIRCUIT

SEC-33

< COMPONENT DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

C

D

E

F

G

H

I

J

L

M

A

B

SEC

N

O

P

IPDM E/R : Diagnosis Procedure

INFOID:0000000003586758

1.

PERFORM SELF DIAGNOSTIC

1.

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

2.

Check “Self Diagnostic Result” of IPDM E/R.

Is “CAN COMM CIRCUIT” displayed?

YES

>> Refer to 

LAN-18, "Trouble Diagnosis Flow Chart"

.

NO

>> Refer to 

GI-38, "Intermittent Incident"

.

SEC-34

< COMPONENT DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

U1010 CONTROL UNIT (CAN)

U1010 CONTROL UNIT (CAN)

BCM

BCM : DTC Logic

INFOID:0000000003586495

DTC DETECTION LOGIC

BCM : Diagnosis Procedure

INFOID:0000000003586496

1.

REPLACE BCM

When DTC “U1010: CONTROL UNIT (CAN)” is detected, replace BCM.

>> Replace BCM. Refer to 

BCS-84, "Exploded View"

.

BCM : Special Repair Requirement

INFOID:0000000003586497

1.

REQUIRED WORK WHEN REPLACING BCM

Initialize control unit. Refer to CONSULT-III operation manual NATS-IVIS/NVIS.

>> Work end.

DTC

CONSULT-III display de-

scription

DTC Detection Condition

Possible cause

U1010

CONTROL UNIT (CAN)

BCM detected internal CAN communication circuit malfunction.

BCM

P1610 LOCK MODE

SEC-35

< COMPONENT DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

C

D

E

F

G

H

I

J

L

M

A

B

SEC

N

O

P

P1610 LOCK MODE

Description

INFOID:0000000003586498

When the starting operation is carried more than five times consecutively under the following conditions, NATS
will shift to the mode which prevents the engine from being started.
• Unregistered Intelligent Key is used.
• BCM or ECM is malfunctioning.

DTC Logic

INFOID:0000000003586499

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON.

2.

Check “Self diagnostic result” with CONSULT-III.

Is DTC detected?

YES

>> Go to 

SEC-35, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000003586500

1.

CHECK ENGINE START FUNCTION

1.

Perform the check for DTC except DTC P1610.

2.

Use CONSULT-III to erase DTC after fixing.

3.

Turn ignition switch OFF.

4.

Turn ignition switch ON when registered Intelligent Key insert into key slot and wait for 5 seconds.

5.

Return the ignition switch OFF and wait 5 seconds.

6.

Repeat steps 4 and 5 twice (total of 3 cycles).

7.

Check that engine can start when registered Intelligent Key insert into key slot.

>> INSPECTION END

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

P1610

LOCK MODE

When the starting operation is carried out 
five or more times consecutively under the 
following conditions.
• Unregistered Intelligent Key
• BCM or ECM is malfunctioning.

—