Infiniti FX35, FX50 (S51). Manual — part 800
U0113, U1003 CAN COMM CIRCUIT
EC-741
< DTC/CIRCUIT DIAGNOSIS >
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2.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E10, F10
• Harness for open or short between ECM and VVEL control module
>> Repair open circuit, short to ground or short to power in harness or connectors.
3.
CHECK INTERMITTENT INCIDENT
GI-36, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace.
4.
REPLACE VVEL CONTROL MODULE
1.
Replace VVEL control module.
2.
Perform
EC-579, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT (VVEL CONTROL
MODULE) : Special Repair Requirement"
.
>> GO TO 5.
5.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
1.
Reconnect all harness connectors disconnected.
2.
Turn ignition switch ON.
3.
Select “SELF DIAGNOSTIC RESULT” mode with CONSULT-III.
4.
Touch “ERASE”.
5.
Perform DTC Confirmation Procedure.
See
.
With GST
1.
Reconnect all harness connectors disconnected.
2.
Turn ignition switch ON.
3.
Select Service $04 with GST.
4.
Perform DTC Confirmation Procedure.
See
.
Is the DTC U0113 or U1003 displayed again?
YES
>> GO TO 6.
NO
>> INSPECTION END
6.
REPLACE ECM
1.
Replace ECM.
2.
EC-579, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT (ECM) : Special Repair
.
>> INSPECTION END
EC-742
< DTC/CIRCUIT DIAGNOSIS >
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U1001 CAN COMM CIRCUIT
U1001 CAN COMM CIRCUIT
Description
INFOID:0000000005237226
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, 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.
DTC Logic
INFOID:0000000005237227
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Turn ignition switch ON and wait at least 3 seconds.
2.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>>
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005237228
Go to
LAN-20, "Trouble Diagnosis Flow Chart"
.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
U1001
CAN communication line
When ECM is not transmitting or receiving CAN
communication signal other than OBD (emission
related diagnosis) for 2 seconds or more.
• Harness or connectors
(CAN communication line is open or
shorted)
U1024 CAN COMM CIRCUIT
EC-743
< DTC/CIRCUIT DIAGNOSIS >
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U1024 CAN COMM CIRCUIT
Description
INFOID:0000000005237229
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. ECM and
VVEL control module are connected with two communication lines (CAN H line and CAN L line) and transmit/
receive data. ECM shares information and links with the VVEL control module during operation.
DTC Logic
INFOID:0000000005237230
DTC DETECTION LOGIC
NOTE:
If DTC U1024 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607.
Refer to
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10 V at idle.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Turn ignition switch ON and wait at least 3 seconds.
2.
Check DTC.
Is DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005237231
1.
CHECK VVEL CAN COMMUNICATION CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Disconnect VVEL control module harness connector.
4.
Check the continuity between ECM harness connector and VVEL control module harness connector.
5.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
DETECT MALFUNCTIONING PART
Check the following.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
U1024
VVEL CAN communication
• When VVEL control module cannot transmitting
or receiving CAN communication signal with
ECM for 2 seconds or more.
• When detecting error during the initial diagnosis
of CAN controller of VVEL control module.
• Harness or connectors
(CAN communication line is open or
shorted)
• ECM
• VVEL control module
ECM
VVEL control module
Continuity
Connector
Terminal
Connector
Terminal
F111
89
E16
24
Existed
M160
93
11
EC-744
< DTC/CIRCUIT DIAGNOSIS >
[VK50VE]
U1024 CAN COMM CIRCUIT
• Harness connectors E10, F10
• Harness for open or short between ECM and VVEL control module
>> Repair open circuit, short to ground or short to power in harness or connectors.
3.
CHECK INTERMITTENT INCIDENT
GI-36, "Intermittent Incident"
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace.
4.
REPLACE VVEL CONTROL MODULE
1.
Replace VVEL control module.
2.
Perform
EC-579, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT (VVEL CONTROL
MODULE) : Special Repair Requirement"
.
>> GO TO 5.
5.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
1.
Reconnect all harness connectors disconnected.
2.
Turn ignition switch ON.
3.
Select “SELF DIAGNOSTIC RESULT” mode with CONSULT-III.
4.
Touch “ERASE”.
5.
Perform DTC Confirmation Procedure.
See
With GST
1.
Reconnect all harness connectors disconnected.
2.
Turn ignition switch ON.
3.
Select Service $04 with GST.
4.
Perform DTC Confirmation Procedure.
See
Is the DTC U1024 displayed again?
YES
>> GO TO 6.
NO >> INSPECTION
END
6.
REPLACE ECM
1.
Replace ECM.
2.
Go to
EC-579, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT (ECM) : Special Repair
.
>> INSPECTION END
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