Infiniti G37 Coupe. Manual — part 490
POWER SUPPLY AND GROUND CIRCUIT
EC-141
< COMPONENT DIAGNOSIS >
[VQ37VHR]
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6.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors F103, M116
• Harness for open or short between ECM and ground
>> Repair open circuit or short to power in harness or connectors.
7.
CHECK ECM POWER SUPPLY CIRCUIT-II
1.
Reconnect ECM harness connector.
2.
Turn ignition switch ON.
3.
Check the voltage between IPDM E/R harness connector and ground.
Is the inspection result normal?
YES
>> Go to
NO
>> GO TO 8.
8.
CHECK ECM POWER SUPPLY CIRCUIT-III
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Check the voltage between ECM harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 15.
NO-1
>> Battery voltage does not exist: GO TO 9.
NO-2
>> Battery voltage exists for more than a few seconds: GO TO 12.
9.
CHECK ECM POWER SUPPLY CIRCUIT-IV
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Check the voltage between ECM harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> GO TO 12.
10.
CHECK ECM POWER SUPPLY CIRCUIT-V
1.
Disconnect ECM harness connector.
2.
Disconnect IPDM E/R harness connector E7.
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.
IPDM E/R
Ground
Voltage
Connector
Terminal
E7
53
Ground
Battery voltage
ECM
Ground
Voltage
Connector
Terminal
M107
125
Ground
After turning ignition switch OFF, battery volt-
age will exist for a few seconds, then drop ap-
proximately 0V.
ECM
Ground
Voltage
Connector
Terminal
F101
24
Ground
Battery voltage
ECM
IPDM E/R
Continuity
Connector
Terminal
Connector
Terminal
M107
125
E7
49
Existed
EC-142
< COMPONENT DIAGNOSIS >
[VQ37VHR]
POWER SUPPLY AND GROUND CIRCUIT
Is the inspection result normal?
YES
>> GO TO 18.
NO
>> GO TO 11.
11.
DETECT MALFUNCTIONING PART
Check the following.
• Harness or connectors E106, M6
• Harness for open or short between ECM and IPDM E/R
>> Repair open circuit or short to ground or short to power in harness or connectors.
12.
CHECK ECM POWER SUPPLY CIRCUIT-VI
1.
Disconnect ECM harness connector.
2.
Disconnect IPDM E/R harness connector E7.
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.
• Harness or connectors E3, F1
• Harness connectors F104, F105
• Harness for open or short between ECM and IPDM E/R
>> Repair open circuit or short to ground or short to power in harness or connectors.
14.
CHECK 15A FUSE
1.
Disconnect 15A fuse (No. 50) from IPDM E/R.
2.
Check 15A fuse.
Is the inspection result normal?
YES
>> GO TO 18.
NO
>> Replace 15A fuse.
15.
CHECK GROUND CONNECTION-II
Check ground connection M95. Refer to Ground Inspection in
Is the inspection result normal?
YES
>> GO TO 16.
NO
>> Repair or replace ground connection.
16.
CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-II
1.
Disconnect ECM harness connector.
2.
Check the continuity between ECM harness connector and ground.
ECM
IPDM E/R
Continuity
Connector
Terminal
Connector
Terminal
F101
24
E7
69
Existed
POWER SUPPLY AND GROUND CIRCUIT
EC-143
< COMPONENT DIAGNOSIS >
[VQ37VHR]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
3.
Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 18.
NO
>> GO TO 17.
17.
DETECT MALFUNCTIONING PART
Check the following.
• Harness or connectors F103, M116
• Harness for open or short between ECM and ground
>> Repair open circuit or short to power in harness or connectors.
18.
CHECK INTERMITTENT INCIDENT
GI-38, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Replace IPDM E/R.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
ECM
Ground
Continuity
Connector
Terminal
F101
8
Ground
Existed
M107
123
124
127
128
EC-144
< COMPONENT DIAGNOSIS >
[VQ37VHR]
U0113, U1003 CAN COMM CIRCUIT
U0113, U1003 CAN COMM CIRCUIT
Description
INFOID:0000000001736729
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:0000000001736730
DTC DETECTION LOGIC
NOTE:
If DTC U0113 or U1003 is displayed with DTC U1011, first perform the trouble diagnosis for DTC U1011.
Refer to
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10V 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:0000000001736732
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 power.
Is the inspection result normal?
YES
>> GO TO 2.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
U0113
Lost communication with VVEL control
module
CAN communication signal of OBD
(emission related diagnosis) is not re-
ceived VVEL control module and ECM
for 2 seconds or more .
• Harness or connectors
(VVEL CAN communication line is
open or shorted)
• ECM
• VVEL control module
U1003
CAN communication signal other than
OBD (emission related diagnosis) is
not received between VVEL control
module and ECM for 2 seconds or
more .
ECM
VVEL control module
Continuity
Connector
Terminal
Connector
Terminal
F102
54
E15
24
Existed
55
11
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