Nissan Frontier D22. Instruction — part 445
DTC P0400 EGR FUNCTION
EC-883
[VG33E]
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EC
12.
CHECK INTERMITTENT INCIDENT
Refer to
EC-696, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>> INSPECTION END.
Component Inspection
UBS00DK4
EGR VALVE
1.
Apply vacuum to EGR vacuum port with a hand vacuum pump.
2.
Check for sticking.
3.
If NG, repair or replace EGR valve.
EGRC-BPT VALVE
1.
Plug one of two ports of EGRC-BPT valve.
2.
Vacuum from the other port and check for leakage while apply-
ing a pressure above 0.981 kPa (100 mmH
2
O, 3.94 inH
2
O)
from under EGRC-BPT valve.
3.
If a leakage is noted, replace the valve.
Removal and Installation
UBS00DK5
EGR VALVE
Refer to
EM-80, "OUTER COMPONENT PARTS"
.
EGR valve spring should lift.
MEF137D
SEF083P
EC-884
[VG33E]
DTC P0402 EGRC-BPT VALVE FUNCTION
DTC P0402 EGRC-BPT VALVE FUNCTION
PFP:14741
Description
UBS00DK6
SYSTEM DESCRIPTION
The EGRC-BPT valve monitors exhaust pressure to activate the diaphragm, controlling intake manifold vac-
uum applied to the EGR valve. In other words, recirculated exhaust gas is controlled in response to positioning
of the EGR valve or to engine operation.
On Board Diagnosis Logic
UBS00DK7
If too much EGR flow exists due to an EGRC-BPT valve malfunction, off idle engine roughness will increase. If
the roughness is large, then the vacuum to the EGR valve is interrupted through the EGRC-solenoid valve. If
the engine roughness is reduced at that time, the EGRC-BPT valve malfunction is indicated.
DTC Confirmation Procedure
UBS00DK8
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 5 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V at idle.
SEF864U
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible Cause
P0402
ECRC-BPT VALVE FUNCTION
●
The EGRC-BPT valve does not
operate properly.
●
EGRC-BPT valve
●
EGR valve
●
Loose or disconnected rubber tube
●
Blocked rubber tube
●
Camshaft position sensor
●
Blocked exhaust system
●
Orifice
●
Mass air flow sensor
●
EGRC-solenoid valve
DTC P0402 EGRC-BPT VALVE FUNCTION
EC-885
[VG33E]
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EC
WITH CONSULT-II
1.
Install vacuum gauge between EGRC-BPT valve and EGR
valve as shown in the illustration.
2.
Start engine and warm it up to normal operating temperature.
3.
Stop engine and wait at least 5 seconds.
4.
Turn ignition switch ON and select “EGRC-BPT VLV P0402” of
“EGR SYSTEM” in “DTC WORK SUPPORT” mode with CON-
SULT-II.
5.
Start engine and let it idle.
6.
Touch “START”.
7.
Check the output voltage of “THRTL POS SEN” (at closed throt-
tle position) and note it.
8.
When the following conditions are met, “TESTING” will be dis-
played on the CONSULT-II screen and the bar chart may
increase. Maintain the conditions many times until “COM-
PLETED” appears.
NOTE:
●
The bar chart on CONSULT-II screen indicates the status
of this test. However, the test may be finished before the
bar chart becomes full scale.
●
If the bar chart indication does not continue to progress,
completely release accelerator pedal once and try to
meet the conditions again.
●
If “TESTING” does not appear on CONSULT-II screen,
retry from step 2.
9.
If CONSULT-II instructs to carry out Overall Function Check, go
to next step. If “NG” is displayed, refer to
10. Open engine hood.
SEF930VA
SEF718Z
Selector lever
Suitable position
ENG SPEED
1,000 - 1,600 rpm
Vehicle speed
30 - 60 km/h (19 - 37 MPH) (A/T models)
30 - 100 km/h (19 - 62 MPH) (M/T models)
B/FUEL SCHDL
3.5 - 5.2 msec
THRTL POS SEN
X – (X + 0.9) V
X = Voltage value measured at step 7
SEF719Z
LEC038A
EC-886
[VG33E]
DTC P0402 EGRC-BPT VALVE FUNCTION
11. Raise engine speed to 2,000 to 2,800 rpm under no-load and
hold it. Then touch “NEXT” on CONSULT-II screen.
12. Check vacuum gauge while keeping engine speed at 2,000 to
2,800 rpm.
Vacuum should be 0 to
−20 kPa (0 to −150 mmHg, 0 to −5.91
inHg).
If NG, go to
EC-887, "Diagnostic Procedure"
.
If OK, touch “YES” on the CONSULT-II screen.
13. Check the rubber tube between intake manifold collector,
EGRC-solenoid valve, EGR valve and EGRC-BPT valve for
cracks, blockages or twisting.
If NG, repair or replace.
If OK, touch “YES” on the CONSULT-II screen.
Overall Function Check
UBS00DK9
Use this procedure to check the overall function of the EGRC-BPT valve. During this check, a 1st trip DTC
might not be confirmed.
WITH GST
1.
Install vacuum gauge between EGRC-BPT valve and EGR
valve as shown in the illustration.
2.
Lift up vehicle.
3.
Start engine and shift to 1st gear position.
4.
Check vacuum gauge while keeping engine speed at 2,000 to
2,800 rpm.
Vacuum should be 0 to
−20 kPa (0 to −150 mmHg, 0 to −5.91
inHg).
If NG, go to
EC-887, "Diagnostic Procedure"
.
If OK, go to next step.
5.
Check rubber tube between intake manifold collector, EGRC-
solenoid valve, EGR valve and EGRC-BPT valve for misconnection, cracks or blockages.
6.
If NG, go to
EC-887, "Diagnostic Procedure"
.
PEF034W
PEF035W
SEF930V
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