Infiniti G35 (V35) Sedan. Manual — part 998
PCS-46
< COMPONENT DIAGNOSIS >
[POWER DISTRIBUTION SYSTEM]
U1000 CAN COMM CIRCUIT
COMPONENT DIAGNOSIS
U1000 CAN COMM CIRCUIT
Description
INFOID:0000000000964208
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-28, "CAN Communication Signal Chart"
DTC Logic
INFOID:0000000000964209
DTC DETECTION LOGIC
Diagnosis Procedure
INFOID:0000000000964210
1.
PERFORM SELF DIAGNOSTIC
1.
Turn ignition switch ON and wait for 2 second or more.
2.
Check “Self Diagnostic Result”.
Is “CAN COMM CIRCUIT” displayed?
YES
>> Refer to
LAN-18, "Trouble Diagnosis Flow Chart"
NO
>> Refer to
GI-39, "Intermittent Incident"
.
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 sec-
onds or more.
In CAN communication system, any item (or items)
of the following listed below is malfunctioning.
• Transmission
• Receiving (ECM)
• Receiving (VDC/TCS/ABS)
• Receiving (METER/M&A)
• Receiving (TCM)
• Receiving (MULTI AV)
• Receiving (IPDM E/R)
PCS
U1010 CONTROL UNIT (CAN)
PCS-47
< COMPONENT DIAGNOSIS >
[POWER DISTRIBUTION SYSTEM]
C
D
E
F
G
H
I
J
K
L
B
A
O
P
N
U1010 CONTROL UNIT (CAN)
DTC Logic
INFOID:0000000000964211
DTC DETECTION LOGIC
Diagnosis Procedure
INFOID:0000000000964212
1.
REPLACE BCM
When DTC [U1010] is detected, replace BCM.
>> Replace BCM.
Special Repair Requirement
INFOID:0000000000964213
1.
REQUIRED WORK WHEN REPLACING BCM
Initialize IVIS by CONSULT-III. For the details of initialization 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-48
< COMPONENT DIAGNOSIS >
[POWER DISTRIBUTION SYSTEM]
B2553 IGNITION RELAY
B2553 IGNITION RELAY
Description
INFOID:0000000000964214
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:0000000000964215
DTC DETECTION 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 selector lever is in the P or N position.
-
Release brake pedal.
2.
Check “Self diagnostic result” with CONSULT-III.
Is DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000000964216
1.
CHECK DTC WITH IPDM E/R
Check “Self diagnostic result” with CONSULT-III. Refer to
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace.
2.
CHECK IGNITION RELAY FEEDBACK INPUT SIGNAL
1.
Turn ignition switch OFF.
2.
Disconnect BCM harness connector M123.
3.
Check voltage between BCM harness connector and ground under the following conditions.
Is the inspection result normal?
YES
>> Replace BCM? IPDM E/R?
NO
>> GO TO 3.
3.
CHECK IGNITION RELAY FEEDBACK CIRCUIT
1.
Disconnect IPDM E/R harness connector E5.
2.
Check continuity between BCM harness connector and IPDM E/R harness connector.
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]
Connector
Terminal
M123
123
Ground
Ignition switch
OFF
0
NO
Battery voltage
PCS
B2553 IGNITION RELAY
PCS-49
< COMPONENT DIAGNOSIS >
[POWER DISTRIBUTION SYSTEM]
C
D
E
F
G
H
I
J
K
L
B
A
O
P
N
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
GI-39, "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
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