Infiniti FX35, FX50 (S51). Manual — part 735
IGNITION SIGNAL
EC-481
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Go to
2.
CHECK IGNITION COIL POWER SUPPLY CIRCUIT-II
1.
Turn ignition switch OFF.
2.
Disconnect condenser harness connector.
3.
Turn ignition switch ON.
4.
Check the voltage between condenser harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> GO TO 3.
3.
CHECK IGNITION COIL POWER SUPPLY CIRCUIT-III
1.
Turn ignition switch OFF.
2.
Disconnect IPDM E/R harness connector E7.
3.
Check the continuity between IPDM E/R harness connector and condenser harness connector.
4.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> Go to
NO
>> GO TO 4.
4.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E3, F1
• Harness for open or short between IPDM E/R and condenser
>> Repair open circuit, short to ground or short to power in harness or connectors.
5.
CHECK CONDENSER GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Check the continuity between condenser harness connector and ground.
3.
Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair open circuit or short to power in harness or connectors.
ECM
Voltage
Connector
+
–
Terminal
Terminal
M107
125
128
Battery voltage
Condenser
Ground
Voltage
Connector
Terminal
F8
1
Ground
Battery voltage
IPDM E/R
Condenser
Continuity
Connector
Terminal
Connector
Terminal
E7
53
F8
1
Existed
Condenser
Ground
Continuity
Connector
Terminal
F8
2
Ground
Existed
EC-482
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
IGNITION SIGNAL
6.
CHECK CONDENSER
EC-484, "Component Inspection (Condenser)"
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Replace condenser.
7.
CHECK IGNITION COIL POWER SUPPLY CIRCUIT-III
1.
Reconnect all harness connectors disconnected.
2.
Disconnect ignition coil harness connector.
3.
Turn ignition switch ON.
4.
Check the voltage between ignition coil harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> GO TO 8.
8.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connector F1
• Harness for open or short between ignition coil and harness connector F1
>> Repair or replace harness or connectors.
9.
CHECK IGNITION COIL GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Check the continuity between ignition coil harness connector and ground.
3.
Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> Repair open circuit or short to power in harness or connectors.
10.
CHECK IGNITION COIL OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Disconnect ECM harness connector.
2.
Check the continuity between ignition coil harness connector and ECM harness connector.
Ignition coil
Ground
Voltage
Cylinder
Connector
Terminal
1
F11
3
Ground
Battery voltage
2
F12
3
3
F13
3
4
F14
3
5
F15
3
6
F16
3
Ignition coil
Ground
Continuity
Cylinder
Connector
Terminal
1
F11
2
Ground
Existed
2
F12
2
3
F13
2
4
F14
2
5
F15
2
6
F16
2
IGNITION SIGNAL
EC-483
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
3.
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 F104, F105
• Harness for open or short between ignition coil and ECM
>> Repair open circuit, short to ground or short to power in harness or connectors.
12.
CHECK IGNITION COIL WITH POWER TRANSISTOR
EC-483, "Component Inspection (Ignition Coil with Power Transistor)"
.
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> Replace malfunctioning ignition coil with power transistor.
13.
CHECK INTERMITTENT INCIDENT
GI-36, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection (Ignition Coil with Power Transistor)
INFOID:0000000005237099
1.
CHECK IGNITION COIL WITH POWER TRANSISTOR-I
1.
Turn ignition switch OFF.
2.
Disconnect ignition coil harness connector.
3.
Check resistance between ignition coil terminals as follows.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace malfunctioning ignition coil with power transistor.
2.
CHECK IGNITION COIL WITH POWER TRANSISTOR-II
CAUTION:
Perform the following procedure in a place with no combustible objects and good ventilation.
1.
Turn ignition switch OFF.
2.
Reconnect all harness connectors disconnected.
Ignition coil
ECM
Continuity
Cylinder
Connector
Terminal
Connector
Terminal
1
F11
1
F101
20
Existed
2
F12
1
16
3
F13
1
12
4
F14
1
11
5
F15
1
15
6
F16
1
19
Terminals
Resistance [at 25
°
C (77
°
F)]
1 and 2
Except 0 or
∞Ω
1 and 3
Except 0
Ω
2 and 3
EC-484
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
IGNITION SIGNAL
3.
Remove fuel pump fuse (1) in IPDM E/R (2) to release fuel pres-
sure.
NOTE:
Do not use CONSULT-III to release fuel pressure, or fuel pres-
sure applies again during the following procedure.
4.
Start engine.
5.
After engine stalls, crank it 2 or 3 times to release all fuel pres-
sure.
6.
Turn ignition switch OFF.
7.
Remove all ignition coil harness connectors to avoid the electri-
cal discharge from the ignition coils.
8.
Remove ignition coil and spark plug of the cylinder to be
checked.
9.
Crank engine for 5 seconds or more to remove combustion gas in the cylinder.
10. Connect spark plug and harness connector to ignition coil.
11. Fix ignition coil using a rope etc. with gap of 13 - 17 mm (0.52 -
0.66 in) between the edge of the spark plug and grounded metal
portion as shown in the figure.
12. Crank engine for approximately 3 seconds, and check whether
spark is generated between the spark plug and the grounded
metal portion.
CAUTION:
• Never place to the spark plug and the ignition coil within
50 cm (19.7 in). Be careful not to get an electrical shock
while checking, because the electrical discharge voltage
becomes 20 kV or more.
• It might damage the ignition coil if the gap of more than 17 mm (0.66 in) is made.
NOTE:
When the gap is less than 13 mm (0.52 in), a spark might be generated even if the coil is malfunc-
tioning.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace malfunctioning ignition coil with power transistor.
Component Inspection (Condenser)
INFOID:0000000005237100
1.
CHECK CONDENSER
1.
Turn ignition switch OFF.
2.
Disconnect condenser harness connector.
3.
Check resistance between condenser terminals as follows.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace condenser.
Spark should be generated.
JMBIA1506ZZ
JMBIA0066GB
Terminals
Resistance
1 and 2
Above 1 M
Ω
[at 25
°
C (77
°
F)]
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