Infiniti QX56 (Z62). Manual — part 548
EC-170
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
POWER SUPPLY AND GROUND CIRCUIT
Check the following.
• Loose or poor connection for each connector and harness
• Harness for open or short between ECM and IPDM E/R
>> Repair open circuit, short to ground or short to power in harness or connectors.
11.
CHECK 20 A FUSE
1.
Disconnect 20 A fuse (No. 43) from IPDM E/R.
2.
Check 20 A fuse.
Is the inspection result normal?
YES
>> GO TO 14.
NO
>> Replace 15 A fuse.
12.
CHECK ECM POWER SUPPLY CIRCUIT-VI
1.
Disconnect ECM harness connector.
2.
Disconnect IPDM E/R harness connector.
3.
Check the continuity between ECM harness connector and IPDM E/R harness connector.
4.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 14.
NO
>> GO TO 13.
13.
DETECT MALFUNCTIONING PART
Check the following.
• Loose or poor connection for each connector and harness
• Harness for open or short between ECM and IPDM E/R
>> Repair open circuit, short to ground or short to power in harness or connectors.
14.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
Is the inspection result normal?
YES
>> Replace IPDM E/R. Refer to
PCS-32, "Removal and Installation"
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
ECM
IPDM E/R
Continuity
Connector
Terminal
Connector
Terminal
E80
171
E14
35
Existed
172
U0101 CAN COMM CIRCUIT
EC-171
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
U0101 CAN COMM CIRCUIT
DTC Logic
INFOID:0000000006217764
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Turn ignition switch ON and wait at least 3 seconds.
2.
Check DTC.
Is DTC detected?
YES
>>
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006217765
Perform the trouble diagnosis for CAN communication system. Refer to
LAN-18, "Trouble Diagnosis Flow
.
DTC No.
Trouble diagnosis name
(Trouble diagnosis content)
DTC detecting condition
Possible cause
U0101
LOST COMM (TCM)
(Lost communication with TCM)
When ECM is not transmitting or receiving
CAN communication signal of OBD (emis-
sion related diagnosis) with TCM for 2 sec-
onds or more.
• CAN communication line betrween
TCM and ECM
(CAN communication line is open or
shorted)
EC-172
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
U1001 CAN COMM CIRCUIT
U1001 CAN COMM CIRCUIT
DTC Logic
INFOID:0000000006217768
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:0000000006217769
Perform the trouble diagnosis for CAN communication system. Refer to
LAN-18, "Trouble Diagnosis Flow
.
DTC No.
Trouble diagnosis name
(Trouble diagnosis content)
DTC detecting condition
Possible cause
U1001
CAN COMM CIRCUIT
(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)
U0113, U1003 CAN COMM CIRCUIT
EC-173
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
U0113, U1003 CAN COMM CIRCUIT
DTC Logic
INFOID:0000000006412037
DTC DETECTION LOGIC
NOTE:
If DTC U0113 or U1003 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 10 V or more 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
>> Proceed to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006412038
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.
• Harness for open or short between ECM and VVEL control module
• Loose or poor connection for each connector and harness
DTC No.
Trouble diagnosis name
(Trouble diagnosis content)
DTC detecting condition
Possible cause
U0113
CAN COMM CIRCUIT
(Lost communication with VVEL
control module)
When ECM is not transmitting or receiving
CAN communication signal of OBD (emis-
sion related diagnosis) with VVEL control
module for 2 seconds or more.
• Harness or connectors
(VVEL CAN communication line is
open or shorted)
• ECM
• VVEL control module
U1003
When ECM is not transmitting or receiving
CAN communication signal other than OBD
(emission related diagnosis) with VVEL
control module for 2 seconds or more.
ECM
VVEL control module
Continuity
Connector
Terminal
Connector
Terminal
E80
161
F56
24
Existed
166
11
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