Infiniti EX35. Manual — part 596
EC-126
< COMPONENT DIAGNOSIS >
[VQ35HR]
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
Diagnosis Procedure
INFOID:0000000003133289
OVERALL SEQUENCE
PBIB2268E
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
EC-127
< COMPONENT DIAGNOSIS >
[VQ35HR]
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DETAILED PROCEDURE
1.
CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”
With CONSULT-III
1.
Start engine.
2.
Confirm that the testing conditions are met. Refer to
EC-125, "Component Function Check"
3.
Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “SPEC” of “DATA MONITOR” mode, and check that the each
indication is within the SP value.
JMBIA0056GB
EC-128
< COMPONENT DIAGNOSIS >
[VQ35HR]
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
NOTE:
Check “A/F ALPHA-B1”, “A/F ALPHA-B2” for approximately 1 minute because they may fluctuate. It is NG
if the indication is out of the SP value even a little.
Is the measurement value within the SP value?
YES
>> GO TO 17.
NO-1
>> Less than the SP value: GO TO 2.
NO-2
>> More than the SP value: GO TO 3.
2.
CHECK “B/FUEL SCHDL”
Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and check that the indication is within the SP
value.
Is the measurement value within the SP value?
YES
>> GO TO 4.
NO
>> More than the SP value: GO TO 19.
3.
CHECK “B/FUEL SCHDL”
Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and check that the indication is within the SP
value.
Is the measurement value within the SP value?
YES
>> GO TO 6.
NO-1
>> More than the SP value: GO TO 6.
NO-2
>> Less than the SP value: GO TO 25.
4.
CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”
1.
Stop the engine.
2.
Disconnect PCV hose, and then plug it.
3.
Start engine.
4.
Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “SPEC” of “DATA MONITOR” mode, and check that the each
indication is within the SP value.
Is the measurement value within the SP value?
YES
>> GO TO 5.
NO
>> GO TO 6.
5.
CHANGE ENGINE OIL
1.
Stop the engine.
2.
Change engine oil.
NOTE:
This symptom may occur when a large amount of gasoline is mixed with engine oil because of driving
conditions (such as when engine oil temperature does not rise enough since a journey distance is too
short during winter). The symptom will not be detected after changing engine oil or changing driving con-
dition.
>> INSPECTION END
6.
CHECK FUEL PRESSURE
Check fuel pressure. (Refer to
Is the inspection result normal?
YES
>> GO TO 9.
NO-1
>> Fuel pressure is too high: Replace “fuel filter and fuel pump assembly” and then GO TO 8.
NO-2
>> Fuel pressure is too low: GO TO 7.
7.
DETECT MALFUNCTIONING PART
Check fuel hoses and fuel tubes for clogging.
Is the inspection result normal?
YES
>> Replace “fuel filter and fuel pump assembly” and then GO TO 8.
NO
>> Repair or replace and then GO TO 8.
8.
CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
EC-129
< COMPONENT DIAGNOSIS >
[VQ35HR]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
1.
Start engine.
2.
Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “SPEC” of “DATA MONITOR” mode, and check that the each
indication is within the SP value.
Is the measurement value within the SP value?
YES
>> INSPECTION END
NO
>> GO TO 9.
9.
PERFORM POWER BALANCE TEST
1.
Perform “POWER BALANCE” in “ACTIVE TEST” mode.
2.
Make sure that the each cylinder produces a momentary engine speed drop.
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> GO TO 10.
10.
DETECT MALFUNCTIONING PART
Check the following.
• Ignition coil and its circuit (Refer to
EC-458, "Component Function Check"
• Fuel injector and its circuit (Refer to
EC-449, "Component Function Check"
• Intake air leakage
• Low compression pressure (Refer to
Is the inspection result normal?
YES
>> Replace fuel injector and then GO TO 11.
NO
>> Repair or replace malfunctioning part and then GO TO 11.
11.
CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”
1.
Start engine.
2.
Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “SPEC” of “DATA MONITOR” mode, and check that the each
indication is within the SP value.
Is the measurement value within the SP value?
YES
>> INSPECTION END
NO
>> GO TO 12.
12.
CHECK A/F SENSOR 1 FUNCTION
Perform all DTC CONFIRMATION PROCEDURE related with A/F sensor 1.
• For DTC P0130, P0150, refer to
.
• For DTC P0131, P0151, refer to
.
• For DTC P0132, P0152, refer to
.
• For DTC P0133, P0153, refer to
.
• For DTC P2A00, P2A03, refer to
Is any DTC detected?
YES
>> GO TO 13.
NO
>> GO TO 15.
13.
CHECK A/F SENSOR 1 CIRCUIT
Perform Diagnosis Procedure according to corresponding DTC.
>> GO TO 14.
14.
CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”
1.
Start engine.
2.
Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “SPEC” of “DATA MONITOR” mode, and check that the each
indication is within the SP value.
Is the measurement value within the SP value?
YES
>> INSPECTION END
NO
>> GO TO 15.
15.
DISCONNECT AND RECONNECT ECM HARNESS CONNECTOR
1.
Stop the engine.
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