Nissan GT-R (R35) · Service Manual
ENGINE
ENGINE › ENGINE CONTROL SYSTEM › COMPONENT DIAGNOSIS
POWER SUPPLY AND GROUND CIRCUIT
VR38
1.CHECK GROUND CONNECTION-I
Turn ignition switch OFF.
Check ground connection M95. Refer to Ground Inspection in
Circuit Inspection
.
Is the inspection result normal?
YES
>>
GO TO 2
.
NO
>>
Repair or replace ground connection.
2.CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-I
Disconnect ECM harness connector.
Check the continuity between ECM harness connector and ground.
ECM
Ground
Continuity
Connector
Terminal
F101
6
Ground
Existed
F102
54
M107
124
128
Also check harness for short to power.
Is the inspection result normal?
YES
>>
GO TO 4
.
NO
>>
GO TO 3
.
3.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.
4.CHECK ECM POWER SUPPLY CIRCUIT-I
Reconnect ECM harness connector.
Turn ignition switch ON.
Check the voltage between ECM harness connector and ground.
ECM
Voltage
Connector
+
–
Terminal
Terminal
M107
106
128
Battery voltage
Is the inspection result normal?
YES
>>
GO TO 6
.
NO
>>
GO TO 5
.
5.DETECT MALFUNCTIONING PART
Check the following.
Harness connectors E106, M6
IPDM E/R harness connector E7
10A fuse (No. 44)
Harness for open or short between ECM and fuse
>>
Repair open circuit, short to ground or short to power in harness or connectors.
6.CHECK ECM POWER SUPPLY CIRCUIT-III
Turn ignition switch OFF and wait at least 10 seconds.
Check the voltage between ECM harness connector terminals as follows.
ECM
Voltage
Connector
+
–
Terminal
Terminal
M107
121
128
After turning ignition switch OFF, battery voltage will exist for a few seconds, then drop to approximately 0 V.
122
Is the inspection result normal?
YES
>>
GO TO 7
.
NO
>>
GO TO 9
.
7.CHECK ECM POWER SUPPLY CIRCUIT-II
Turn ignition switch ON.
Check the voltage between IPDM E/R harness connector and ground.
IPDM E/R
Ground
Voltage
Connector
Terminal
E7
53
Ground
Battery voltage
Is the inspection result normal?
YES
>>
GO TO 8
.
NO
>>
Replace IPDM E/R.
8.CHECK INTERMITTENT INCIDENT
Refer to
Circuit Inspection
.
>>
INSPECTION END
9.CHECK ECM POWER SUPPLY CIRCUIT-IV
Turn ignition switch OFF and wait at least 10 seconds.
Check the voltage between ECM harness connector terminals as follows.
ECM
Voltage
Connector
+
–
Terminal
Terminal
M107
105
128
Battery voltage
Is the inspection result normal?
YES
>>
GO TO 13
.
NO
>>
GO TO 10
.
10.CHECK ECM POWER SUPPLY CIRCUIT-VI
Disconnect ECM harness connector.
Disconnect IPDM E/R harness connector.
Check the continuity between ECM harness connector and IPDM E/R harness connector.
ECM
IPDM E/R
Continuity
Connector
Terminal
Connector
Terminal
M107
105
E7
69
Existed
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>>
GO TO 12
.
NO
>>
GO TO 11
.
11.DETECT MALFUNCTIONING PART
Check the following.
Harness connectors E106, M6
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.
12.CHECK 15A FUSE
Disconnect 15A fuse (No. 50) from IPDM E/R.
Check 15A fuse.
Is the inspection result normal?
YES
>>
GO TO 15
.
NO
>>
Replace 15A fuse.
13.CHECK ECM POWER SUPPLY CIRCUIT-V
Disconnect ECM harness connector.
Disconnect IPDM E/R harness connector.
Check the continuity between ECM harness connector and IPDM E/R harness connector.
ECM
IPDM E/R
Continuity
Connector
Terminal
Connector
Terminal
M107
121
E7
49
Existed
122
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>>
GO TO 15
.
NO
>>
GO TO 14
.
14.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, short to ground or short to power in harness or connectors.
15.CHECK INTERMITTENT INCIDENT
Refer to
Intermittent Incident
.
Is the inspection result normal?
YES
>>
Replace IPDM E/R.
NO
>>
Repair open circuit, short to ground or short to power in harness or connectors.