2007 INFINITI QX56 Factory Service Manual

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Page 1713 of 3061

INFINITI QX56 2007 Factory Service Manual EC-630
< SERVICE INFORMATION >
IGNITION SIGNAL
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)TER-
MI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
4

Page 1714 of 3061

INFINITI QX56 2007 Factory Service Manual IGNITION SIGNAL
EC-631
< SERVICE INFORMATION >
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Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CO

Page 1715 of 3061

INFINITI QX56 2007 Factory Service Manual EC-632
< SERVICE INFORMATION >
IGNITION SIGNAL
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnosis ProcedureINFOID:0000000003532179
1.CHECK ENGINE STAR

Page 1716 of 3061

INFINITI QX56 2007 Factory Service Manual IGNITION SIGNAL
EC-633
< SERVICE INFORMATION >
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2. Read the voltage signal between ECM terminals 46, 60, 61, 62,
65, 79, 80, 81 and ground with an oscilloscope.
3. Verif

Page 1717 of 3061

INFINITI QX56 2007 Factory Service Manual EC-634
< SERVICE INFORMATION >
IGNITION SIGNAL
2. Disconnect IPDM E/R connector E119.
3. Check harness continuity between IPDM E/R terminal 4 and condenser-1 terminal 1.
Refer to Wiring Diagram.
4. Al

Page 1718 of 3061

INFINITI QX56 2007 Factory Service Manual IGNITION SIGNAL
EC-635
< SERVICE INFORMATION >
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5. Check voltage between ignition coil terminal 3 and ground with
CONSULT-II or tester.
OK or NG
OK >> GO TO 12.
NG >> GO

Page 1719 of 3061

INFINITI QX56 2007 Factory Service Manual EC-636
< SERVICE INFORMATION >
IGNITION SIGNAL
Do the following procedure in the place where ventilation is good without the combustible.
1. Turn ignition switch OFF.
2. Disconnect ignition coil harne

EC-636
< SERVICE INFORMATION >
IGNITION SIGNAL
Do the following procedure in the place where ventilation is good without the combustible.
1. Turn ignition switch OFF.
2. Disconnect ignition coil harness connector.
3. Check resistance between ignition coil terminals as follows.
4. If NG, replace ignition coil with power transistor.
If OK, go to next step.
5. Turn ignition switch OFF.
6. Reconnect all harness connectors disconnected.
7. Remove fuel pump fuse in fuse block No. 1 to release fuel pres-
sure.
NOTE:
Do not use CONSULT-II to release fuel pressure, or fuel pres-
sure applies again during the following procedure.
8. Start engine.
9. After engine stalls, crank it two or three times to release all fuel
pressure.
10. Turn ignition switch OFF.
11. Remove all ignition coil harness connectors to avoid the electri-
cal discharge from the ignition coils.
12. Remove ignition coil and spark plug of the cylinder to be
checked.
13. Crank engine for 5 seconds or more to remove combustion gas in the cylinder.
14. Connect spark plug and harness connector to ignition coil.
15. Fix ignition coil using a rope etc. with gap of 13 - 17 mm
between the edge of the spark plug and grounded metal portion
as shown in the figure.
16. Crank engine for about 3 seconds, and check whether spark is
generated between the spark plug and the grounded metal por-
tion.
CAUTION:
• Do not approach to the spark plug and the ignition coil
within 50cm. Be careful not to get an electrical shock
while checking, because the electrical discharge voltage
becomes 20kV or more.
• It might cause to damage the ignition coil if the gap of more than 17 mm is taken.
NOTE:
When the gap is less than 13 mm, the spark might be generated even if the coil is malfunctioning.
17. If NG, replace ignition coil with power transistor.
CONDENSER-1
1. Turn ignition switch OFF.
2. Disconnect condenser-1 harness connector.
Terminal No. (Polarity) Resistance Ω [at 25°C (77°F)]
1 and 2 Except 0 or ∞
1 and 3
Except 0
2 and 3
Spark should be generated.
PBIB0847E
BBIA0380E
PBIB2325E

Page 1720 of 3061

INFINITI QX56 2007 Factory Service Manual IGNITION SIGNAL
EC-637
< SERVICE INFORMATION >
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3. Check resistance between condenser-1 terminals 1 and 2.
Removal and InstallationINFOID:0000000003532181
IGNITION COIL

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