2009 INFINITI QX56 200

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Page 1716 of 4171

INFINITI QX56 2009  Factory Service Manual 
COOLING FANEC-389
< COMPONENT DIAGNOSIS > [VK56DE]
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2. Supply cooling fan motor terminals with battery voltage and
check operation.
Cooling fan motor should operate.
If

Page 1717 of 4171

INFINITI QX56 2009  Factory Service Manual 
EC-390
< COMPONENT DIAGNOSIS >[VK56DE]
ELECTRICAL LOAD SIGNAL
ELECTRICAL LOAD SIGNAL
DescriptionINFOID:0000000003771710
The electrical load signal (Headlamp switch signal, r
ear window defogger switc

Page 1718 of 4171

INFINITI QX56 2009  Factory Service Manual 
ELECTRICAL LOAD SIGNALEC-391
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>>
INSPECTION END
Revision: December 20092009 QX56

Page 1719 of 4171

INFINITI QX56 2009  Factory Service Manual 
EC-392
< COMPONENT DIAGNOSIS >[VK56DE]
FUEL INJECTOR
FUEL INJECTOR
Component DescriptionINFOID:0000000003771712
The fuel injector is a small, precise solenoid valve. When the ECM
supplies a ground to

Page 1720 of 4171

INFINITI QX56 2009  Factory Service Manual 
FUEL INJECTOREC-393
< COMPONENT DIAGNOSIS > [VK56DE]
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2. Disconnect fuel injector harness connector.
3. Turn ignition switch ON.
4. Check voltage between fuel injector

Page 1721 of 4171

INFINITI QX56 2009  Factory Service Manual 
EC-394
< COMPONENT DIAGNOSIS >[VK56DE]
FUEL INJECTOR
Component Inspection
INFOID:0000000003771714
FUEL INJECTOR
1. Disconnect fuel injector harness connector.
2. Check resistance between terminals as

Page 1722 of 4171

INFINITI QX56 2009  Factory Service Manual 
FUEL PUMPEC-395
< COMPONENT DIAGNOSIS > [VK56DE]
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FUEL PUMP
DescriptionINFOID:0000000003771715
SYSTEM DESCRIPTION
*: ECM determines the start signal status by the signa

Page 1723 of 4171

INFINITI QX56 2009  Factory Service Manual 
EC-396
< COMPONENT DIAGNOSIS >[VK56DE]
FUEL PUMP
4. Check voltage between ECM terminal 113 and ground with
CONSULT-IIl or tester.
OK or NG
OK >> GO TO 5.
NG >> GO TO 3.
3.CHECK FUEL PUMP POWER SUPPLY