Infiniti G37 Coupe. Manual - part 970

PCS

U1010 CONTROL UNIT (CAN)

PCS-49

< COMPONENT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

C

D

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B

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N

U1010 CONTROL UNIT (CAN)

DTC Logic

INFOID:0000000001675264

DTC DETECTION LOGIC

Diagnosis Procedure

INFOID:0000000001675265

1.

REPLACE BCM

When DTC [U1010] is detected, replace BCM.

>> Replace BCM.

Special Repair Requirement

INFOID:0000000001675266

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

PCS-50

< COMPONENT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

B2553 IGNITION RELAY

B2553 IGNITION RELAY

Description

INFOID:0000000001675267

BCM turns ON the following relays to ignition power supply to each ECU when the ignition switch is turned
ON.
• Ignition relay (inside fuse box)
• Ignition relay (inside IPDM E/R)
• Blower relay
BCM checks any ignition relay ON request for consistency with the actual ignition relay operation status.

DTC Logic

INFOID:0000000001675268

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON under the following conditions (start the engine), and wait for at least 2 seconds.

A/T models

-

A/T selector lever is in the P or N position

-

Do not depress brake pedal

M/T models

-

Do not depress clutch pedal

2.

Check “Self diagnostic result” with CONSULT-III. 

Is DTC detected?

YES

>> Go to 

PCS-50, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001675269

1.

CHECK DTC WITH IPDM E/R

Check “Self diagnostic result” with CONSULT-III. Refer to 

PCS-123, "DTC Index"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace malfunctioning parts.

2.

CHECK IGNITION RELAY FEEDBACK INPUT SIGNAL

1.

Turn ignition switch OFF.

2.

Disconnect BCM connector M123.

3.

Check voltage between BCM harness connector and ground under the following conditions.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B2553

IGNITION RELAY

BCM detects a difference of signal for 2 seconds or 
more between the following information. 
• Ignition relay (fuse block) ON/OFF operation
• Ignition relay (fuse block) feedback.

• Harness or connectors

(ignition relay feedback circuit is 
open or short)

• IPDM E/R

BCM

Ground

Condition

Voltage (V)

(Approx.)

Connector

Terminal

M123

123

Ground

Ignition switch

OFF

0

ON

Battery voltage

PCS

B2553 IGNITION RELAY

PCS-51

< COMPONENT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

C

D

E

F

G

H

I

J

K

L

B

A

O

P

N

3.

CHECK IGNITION RELAY FEEDBACK CIRCUIT

1.

Disconnect IPDM E/R connector E5.

2.

Check continuity between BCM harness connector and IPDM E/R harness connector.

3.

Check continuity between BCM harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector.

4.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-38, "Intermittent Incident"

.

>> INSPECTION END

BCM

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

M123

123

E5

19

Existed

BCM

Ground

Continuity

Connector

Terminal

M123

123

Ground

Not existed

PCS-52

< COMPONENT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

B260A IGNITION RELAY

B260A IGNITION RELAY

Description

INFOID:0000000001675270

BCM turns ON the following relays to ignition power supply to each ECU when the ignition switch is turned
ON.
• Ignition relay (inside fuse box)
• Ignition relay (inside IPDM E/R)
• Blower fan motor relay
BCM checks any ignition relay ON request for consistency with the actual ignition relay operation status.

DTC Logic

INFOID:0000000001675271

DTC DETECTION LOGIC

NOTE:
• If DTC B260A is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to

PCS-48, "DTC Logic"

.

• If DTC B260A is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to

PCS-49, "DTC Logic"

.

• If DTC B260A is displayed with DTC B261A, first perform the trouble diagnosis for DTC B261A. Refer to

SEC-97, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON under the following conditions, and wait for at least 2 seconds.

A/T models

-

A/T selector lever is in the P or N position

-

Do not depress brake pedal

M/T models

-

Do not depress clutch pedal

2.

Check “Self diagnostic result” with CONSULT-III. 

Is DTC detected?

YES

>> Go to 

PCS-52, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001675272

1.

CHECK DTC WITH IPDM E/R

Check “Self diagnostic result” with CONSULT-III. Refer to 

SEC-214, "DTC Index"

.

Is DTC detected?

YES

>> Repair or replace the malfunctioning parts.

NO

>> GO TO 2.

2.

CHECK IGNITION RELAY INPUT SIGNAL

1.

Turn ignition switch OFF.

2.

Disconnect BCM connector M121.

3.

Check voltage between BCM harness connector and ground.

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B260A

IGNITION RELAY

BCM detects a difference of signal for 2 second or 
more between the following information.
• Ignition relay (IPDM E/R) operation request
• Ignition relay feedback from IPDM E/R (CAN).

• Harness or connectors

(Ignition relay operation circuit is 
open or shorted.)

• IPDM E/R