Nissan Altima L32. Instruction — part 254
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
EC-137
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
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Diagnosis Procedure
INFOID:0000000004349185
OVERALL SEQUENCE
PBIB2318E
EC-138
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
DETAILED PROCEDURE
1.
CHECK “A/F ALPHA-B1”
With CONSULT-III
1. Start engine.
2. Confirm that the testing conditions are met. Refer to
EC-136, "Component Function Check"
3. Select “A/F ALPHA-B1” in “SPEC” of “DATA MONITOR” mode, and make sure that the each indication is
within the SP value.
PBIB3213E
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
EC-139
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
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NOTE:
Check “A/F ALPHA-B1” 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 make sure 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 make sure 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”
1. Stop the engine.
2. Disconnect PCV hose, and then plug it.
3. Start engine.
4. Select “A/F ALPHA-B1” in “SPEC” of “DATA MONITOR” mode, and make sure that the 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”
EC-140
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
1. Start engine.
2. Select “A/F ALPHA-B1” in “SPEC” of “DATA MONITOR” mode, and make sure that the 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.
1. Ignition coil and its circuit (Refer to
EC-470, "Component Function Check"
2. Fuel injector and its circuit (Refer to
EC-463, "Component Function Check"
3. Intake air leakage
4. 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”
1. Start engine.
2. Select “A/F ALPHA-B1” in “SPEC” of “DATA MONITOR” mode, and make sure that the 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, refer to
.
• For DTC P0131, refer to
.
• For DTC P0132, refer to
.
• For DTC P0133, refer to
.
• For DTC P2A00, refer to
Is any DTC detected?
YES
>> GO TO 15.
NO
>> GO TO 13.
13.
CHECK A/F SENSOR 1 CIRCUIT
Perform DIAGNOSTIC PROCEDURE according to corresponding DTC.
>> GO TO 14.
14.
CHECK “A/F ALPHA-B1”
1. Start engine.
2. Select “A/F ALPHA-B1” in “SPEC” of “DATA MONITOR” mode, and make sure 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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