Infiniti G37 Coupe. Manual — part 579
ICC BRAKE SWITCH
EC-497
< COMPONENT DIAGNOSIS >
[VQ37VHR]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace ICC clutch switch.
Terminals
Condition
Continuity
1 and 2
Clutch pedal
Fully released
Existed
Slightly depressed
Not existed
EC-498
< COMPONENT DIAGNOSIS >
[VQ37VHR]
IGNITION SIGNAL
IGNITION SIGNAL
Description
INFOID:0000000001734326
The ignition signal from the ECM is sent to and amplified by the power transistor. The power transistor turns
ON and OFF the ignition coil primary circuit. This ON/OFF operation induces the proper high voltage in the coil
secondary circuit.
Component Function Check
INFOID:0000000001734327
1.
INSPECTION START
Turn ignition switch OFF, and restart engine.
Does the engine start?
YES-1 >> With CONSULT-III: GO TO 2.
YES-2 >> Without CONSULT-III: GO TO 3.
No
>> Go to
2.
CHECK IGNITION SIGNAL FUNCTION
With CONSULT-III
1.
Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT-III.
2.
Make sure that each circuit produces a momentary engine speed drop.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
3.
CHECK IGNITION SIGNAL FUNCTION
Without CONSULT-III
1.
Let engine idle.
2.
Read the voltage signal between ECM harness connector and ground with an oscilloscope.
NOTE:
The pulse cycle changes depending on rpm at idle.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Diagnosis Procedure
INFOID:0000000001734328
1.
CHECK IGNITION COIL POWER SUPPLY CIRCUIT-I
1.
Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
2.
Check the voltage between ECM harness connector and ground.
ECM
Ground
Voltage signal
Connector
Terminal
F101
11
Ground
12
15
16
19
20
JMBIA0035GB
ECM
Ground
Voltage
Connector
Terminal
M107
125
Ground
Battery voltage
IGNITION SIGNAL
EC-499
< COMPONENT DIAGNOSIS >
[VQ37VHR]
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 or 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.
6.
CHECK CONDENSER
EC-502, "Component Inspection (Condenser)"
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Replace condenser.
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-500
< COMPONENT DIAGNOSIS >
[VQ37VHR]
IGNITION SIGNAL
7.
CHECK IGNITION COIL POWER SUPPLY CIRCUIT-IV
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
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