Nissan Frontier D40. Instruction — part 462
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
EC-539
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JMBIA1468GB
EC-540
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TROUBLE DIAGNOSIS - SPECIFICATION VALUE
DETAILED PROCEDURE
1.
CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”
1.
Start engine.
2.
Confirm that the testing conditions are met. Refer to
.
3.
Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “SPEC” of “DATA MONITOR” mode, and make sure that
each indication is within the SP value.
NOTE:
PBIB3214E
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
EC-541
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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.
OK or NG
OK
>> GO TO 17.
NG (Less than the SP value)>>GO TO 2.
NG (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.
OK or NG
OK
>> GO TO 4.
NG (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.
OK or NG
OK
>> GO TO 6.
NG (More than the SP value)>>GO TO 6.
NG (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 make sure that
each indication is within the SP value.
OK or NG
OK
>> GO TO 5.
NG
>> 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-
ditions.
>> INSPECTION END
6.
CHECK FUEL PRESSURE
Check fuel pressure. (Refer to
OK or NG
OK
>> GO TO 9.
NG (Fuel pressure is too high)>>Replace fuel pressure regulator, refer to
.
GO TO 8.
NG (Fuel pressure is too low)>>GO TO 7.
7.
DETECT MALFUNCTIONING PART
1.
Check the following.
-
Clogged and bent fuel hose and fuel tube
-
Clogged fuel filter
-
Fuel pump and its circuit (Refer to
.)
2.
If NG, repair or replace the malfunctioning part. (Refer to
If OK, replace fuel pressure regulator.
EC-542
< COMPONENT DIAGNOSIS >
[VQ40DE]
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
>> GO TO 8.
8.
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 make sure that
each indication is within the SP value.
OK or NG
OK
>> INSPECTION END
NG
>> 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.
OK or NG
OK
>> GO TO 12.
NG
>> GO TO 10.
10.
DETECT MALFUNCTIONING PART
1.
Check the following below.
-
Ignition coil and its circuit (Refer to
EC-866, "Component Description"
.)
-
Fuel injector and its circuit (Refer to
EC-858, "Component Description"
.)
-
Intake air leakage
-
Low compression pressure (Refer to
2.
If NG, repair or replace the malfunctioning part.
If OK, replace fuel injector. (It may be caused by leakage from fuel injector or clogging.)
>> 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 make sure that
each indication is within the SP value.
OK or NG
OK
>> INSPECTION END
NG
>> 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
EC-598, "DTC Confirmation Procedure"
.
• For DTC P0131, P0151, refer to
EC-602, "DTC Confirmation Procedure"
.
• For DTC P0132, P0152, refer to
EC-606, "DTC Confirmation Procedure"
.
• For DTC P0133, P0153, refer to
EC-610, "DTC Confirmation Procedure"
.
• For DTC P2A00, P2A03, refer to
EC-840, "DTC Confirmation Procedure"
OK or NG
OK
>> GO TO 15.
NG
>> 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”, “A/F ALPHA-B2”
1.
Start engine.
2.
Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “SPEC” of “DATA MONITOR” mode, and make sure that
each indication is within the SP value.
OK or NG
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