2006 INFINITI QX56 Factory Service Manual

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Page 1561 of 3383

INFINITI QX56 2006 Factory Service Manual EC-350Revision: November 2009
DTC P0340 CMP SENSOR (PHASE)
2006 QX56
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.

Page 1562 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P0340 CMP SENSOR (PHASE)EC-351
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Revision: November 2009 2006 QX56
2. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on t

Page 1563 of 3383

INFINITI QX56 2006 Factory Service Manual EC-352Revision: November 2009
DTC P0340 CMP SENSOR (PHASE)
2006 QX56
5. CHECK CMP SENSOR (PHASE) GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Check harness continuity between CMP

Page 1564 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P0340 CMP SENSOR (PHASE)EC-353
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Revision: November 2009 2006 QX56
Component InspectionUBS00H4D
CAMSHAFT POSITION SENSOR (PHASE)
1. Loosen the fixing bolt of the sensor.
2.

Page 1565 of 3383

INFINITI QX56 2006 Factory Service Manual EC-354Revision: November 2009
DTC P0420, P0430 THREE WAY CATALYST FUNCTION
2006 QX56
DTC P0420, P0430 THREE WAY CATALYST FUNCTIONPFP:20905
On Board Diagnosis LogicUBS00H4F
The ECM monitors the switchi

Page 1566 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P0420, P0430 THREE WAY CATALYST FUNCTIONEC-355
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Revision: November 2009 2006 QX56
8. Select “DTC & SRT CONFIRMATION ” then “SRT WORK SUP-
PORT ” mode with CONSULT-

Page 1567 of 3383

INFINITI QX56 2006 Factory Service Manual EC-356Revision: November 2009
DTC P0420, P0430 THREE WAY CATALYST FUNCTION
2006 QX56
Diagnostic ProcedureUBS00H4I
1. CHECK EXHAUST SYSTEM
Visually check exhaust tubes and muffler for dent.
OK or NG
OK

Page 1568 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P0420, P0430 THREE WAY CATALYST FUNCTIONEC-357
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Revision: November 2009 2006 QX56
5. CHECK FUEL INJECTOR
1. Stop engine and then turn ignition switch ON.
2. Check voltage

DTC P0420, P0430 THREE WAY CATALYST FUNCTIONEC-357
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Revision: November 2009 2006 QX56
5. CHECK FUEL INJECTOR
1. Stop engine and then turn ignition switch ON.
2. Check voltage between ECM terminals 21, 22, 23, 40, 41, 42, 44, 63 and ground with CONSULT-II or tester.
Refer to Wiring Diagram for fuel injector, EC-599, "
Wiring Dia-
gram" .
OK or NG
OK >> GO TO 6.
NG >> Perform EC-600, "
Diagnostic Procedure" .
6. CHECK FUNCTION OF IGNITION COIL-I
CAUTION:
Do the following procedure in the place where ventilation is good without the combustible.
1. Turn ignition switch OFF.
2. Remove fuel pump fuse in IPDM E/R to release fuel pressure. NOTE:
Do not use CONSULT-II to release fuel pressure, or fuel pres-
sure applies again during the following procedure.
3. Start engine.
4. After engine stalls, crank it two or three times to release all fuel pressure.
5. Turn ignition switch OFF.
6. Remove all ignition coil harness connectors to avoid the electri- cal discharge from the ignition coils.
7. Remove ignition coil and spark plug of the cylinder to be checked.
8. Crank engine for 5 seconds or more to remove combustion gas in the cylinder.
9. Connect spark plug and harness connector to ignition coil.
10. 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.
11. 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.
OK or NG
OK >> GO TO 10.
NG >> GO TO 7. Battery voltage should exist.
PBIB1527E
Spark should be generated.
BBIA0380E
PBIB2325E

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