2007 INFINITI QX56 Factory Service Manual

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Page 1425 of 3061

INFINITI QX56 2007 Factory Service Manual EC-342
< SERVICE INFORMATION >
DTC P0340 CMP SENSOR (PHASE)
DTC P0340 CMP SENSOR (PHASE)
Component DescriptionINFOID:0000000003531840
The camshaft position sensor (PHASE) senses the protrusion of
exha

Page 1426 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0340 CMP SENSOR (PHASE)
EC-343
< SERVICE INFORMATION >
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2. Select “DATA MONITOR” mode with CONSULT-II.
3. Crank engine for at least 2 seconds and run it for at

Page 1427 of 3061

INFINITI QX56 2007 Factory Service Manual EC-344
< SERVICE INFORMATION >
DTC P0340 CMP SENSOR (PHASE)
Wiring Diagram
INFOID:0000000003531843
Specification data are reference values and are measured between each terminal and ground.
Pulse sign

Page 1428 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0340 CMP SENSOR (PHASE)
EC-345
< SERVICE INFORMATION >
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Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the

Page 1429 of 3061

INFINITI QX56 2007 Factory Service Manual EC-346
< SERVICE INFORMATION >
DTC P0340 CMP SENSOR (PHASE)
Refer to EC-143, "Ground Inspection".
OK or NG
OK >> GO TO 3.
NG >> Repair or replace ground connections.
3.CHECK CAMSHAFT POSITION (CMP) SE

Page 1430 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0340 CMP SENSOR (PHASE)
EC-347
< SERVICE INFORMATION >
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6.DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors F32, E2
• Harness for open or sho

Page 1431 of 3061

INFINITI QX56 2007 Factory Service Manual EC-348
< SERVICE INFORMATION >
DTC P0340 CMP SENSOR (PHASE)
5. Check resistance as shown in the figure.
Removal and InstallationINFOID:0000000003531846
CAMSHAFT POSITION SENSOR (PHASE)
Removal
1. Remo

Page 1432 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0420, P0430 THREE WAY CATALYST FUNCTION
EC-349
< SERVICE INFORMATION >
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DTC P0420, P0430 THREE WAY CATALYST FUNCTION
On Board Diagnosis LogicINFOID:0000000003531847

DTC P0420, P0430 THREE WAY CATALYST FUNCTION
EC-349
< SERVICE INFORMATION >
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DTC P0420, P0430 THREE WAY CATALYST FUNCTION
On Board Diagnosis LogicINFOID:0000000003531847
The ECM monitors the switching frequency ratio of air fuel sensor
(A/F) sensor 1 and heated oxygen sensor 2.
A three way catalyst (manifold) with high oxygen storage capacity
will indicate a low switching frequency of heated oxygen sensor 2.
As oxygen storage capacity decreases, the heated oxygen sensor 2
switching frequency will increase.
When the frequency ratio of air fuel ratio (A/F) sensor 1 and heated
oxygen sensor 2 approaches a specified limit value, the three way
catalyst (manifold) malfunction is diagnosed.
DTC Confirmation ProcedureINFOID:0000000003531848
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
WITH CONSULT-II
TESTING CONDITION:
Do not hold engine speed for more than the specified minutes below.
1. Turn ignition switch ON and select “DATA MONITOR” mode with
CONSULT-II.
2. Start engine and warm it up to the normal operating tempera-
ture.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Start engine and keep the engine speed between 3,500 and
4,000 rpm for at least 1 minute under no load.
5. Let engine idle for 1 minute.
6. Make sure that “COOLAN TEMP/S” indicates more than 70°C
(158°F).
If not, warm up engine and go to next step when “COOLAN
TEMP/S” indication reaches to 70°C (158°F).
7. Open engine hood.
PBIB2055E
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0420
0420
(Bank 1)
Catalyst system efficien-
cy below threshold• Three way catalyst (manifold) does not oper-
ate properly.
• Three way catalyst (manifold) does not have
enough oxygen storage capacity.• Three way catalyst (manifold)
• Exhaust tube
• Intake air leaks
• Fuel injector
• Fuel injector leaks
• Spark plug
• Improper ignition timing P0430
0430
(Bank 2)
SEF189Y

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