2004 INFINITI QX56 Factory Service Manual

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Page 1321 of 3371

INFINITI QX56 2004 Factory Service Manual EC-130Revision: August 2007
POWER SUPPLY AND GROUND CIRCUIT
2004 QX56
4. DETECT MALFUNCTIONING PART
Check the following.
10A fuse
Harness for open or short between ECM and ignition switch
>> Repair

Page 1322 of 3371

INFINITI QX56 2004 Factory Service Manual POWER SUPPLY AND GROUND CIRCUIT
EC-131
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8. CHECK ECM POWER SUPPLY CIRCUIT-II
1. Reconnect ECM harness connector.
2. Turn ignition switch ON.
3.

Page 1323 of 3371

INFINITI QX56 2004 Factory Service Manual EC-132Revision: August 2007
POWER SUPPLY AND GROUND CIRCUIT
2004 QX56
11 . CHECK ECM POWER SUPPLY CIRCUIT-V
1. Disconnect ECM harness connector.
2. Disconnect IPDM E/R harness connector E119.
3. Chec

Page 1324 of 3371

INFINITI QX56 2004 Factory Service Manual POWER SUPPLY AND GROUND CIRCUIT
EC-133
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15. CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-II
1. Disconnect ECM harness connector.
2. Check harness

POWER SUPPLY AND GROUND CIRCUIT
EC-133
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15. CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-II
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminals 1, 115, 116 and ground.
Refer to Wiring Diagram.
3. Also check harness for short to power.
OK or NG
OK >> GO TO 17.
NG >> GO TO 16.
16. DETECT MALFUNCTIONING PART
Check the following.
Harness connectors F32, E2
Harness for open or short between ECM and ground
>> Repair open circuit or short to power in harness or connectors.
17. CHECK INTERMITTENT INCIDENT
Refer to EC-127, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
OK or NG
OK >> Replace IPDM E/R.
NG >> Repair open circuit or short to power in harness or connectors.
Ground Inspection UBS00H0H
Ground connections are very important to the proper operation of electrical and electronic circuits. Ground
connections are often exposed to moisture, dirt and other corrosive elements. The corrosion (rust) can
become an unwanted resistance. This unwanted resistance can change the way a circuit works.
Electronically controlled circuits are very sensitive to proper grounding. A loose or corroded ground can drasti-
cally affect an electronically controlled circuit. A poor or corroded ground can easily affect the circuit. Even
when the ground connection looks clean, there can be a thin film of rust on the surface.
When inspecting a ground connection follow these rules:
Remove the ground bolt or screw.
Inspect all mating surfaces for tarnish, dirt, rust, etc.
Clean as required to assure good contact.
Reinstall bolt or screw securely.
Inspect for “add-on” accessories which may be interfering with the ground circuit.
If several wires are crimped into one ground eyelet terminal, check for proper crimps. Make sure all of the
wires are clean, securely fastened and providing a good ground path. If multiple wires are cased in one
eyelet make sure no ground wires have excess wire insulation.Continuity should exist.

Page 1325 of 3371

INFINITI QX56 2004 Factory Service Manual EC-134Revision: August 2007
POWER SUPPLY AND GROUND CIRCUIT
2004 QX56
For detailed ground distribution information, refer to PG-30, "Ground Distribution" .
PBIB1870E

Page 1326 of 3371

INFINITI QX56 2004 Factory Service Manual DTC U1000, U1001 CAN COMMUNICATION LINE
EC-135
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Revision: August 20072004 QX56
DTC U1000, U1001 CAN COMMUNICATION LINEPFP:23710
DescriptionUBS00H0I
CAN (Controller Area Networ

Page 1327 of 3371

INFINITI QX56 2004 Factory Service Manual EC-136Revision: August 2007
DTC U1000, U1001 CAN COMMUNICATION LINE
2004 QX56
Wiring DiagramUBS00H0L
BBWA0873E

Page 1328 of 3371

INFINITI QX56 2004 Factory Service Manual DTC U1000, U1001 CAN COMMUNICATION LINE
EC-137
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Revision: August 20072004 QX56
Diagnostic ProcedureUBS00H0M
Go to LAN-3, "Precautions When Using CONSULT-II" .

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