Nissan Frontier D22. Manual — part 339
DTC P1402 EGR FUNCTION
EC-459
[KA24DE]
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EC
On Board Diagnosis Logic
UBS00DB3
If EGR temperature sensor detects EGR flow under the condition that does not call for EGR, a high-flow mal-
function is diagnosed.
DTC Confirmation Procedure
UBS00DB4
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.
●
Diagnosis for this DTC will occur when engine coolant temperature is approx. 50 to 60
°C (122 to 140°F).
Therefore, it will be better to turn ignition switch ON (Start engine) at the engine coolant temperature
below 30
°C (86°F) when starting DTC confirmation procedure.
TESTING CONDITION:
●
Always perform the test 9 temperature above –10
°C (14°F).
●
Engine coolant temperature and EGR temperature must be
verified in “DATA MONITOR” mode with CONSULT-II before
starting DTC WORK SUPPORT test. If it is out of range
below, the test cannot be conducted.
COOLAN TEMP/S:
−10 to 60°C (14 to 140°F)*
EGR TEMP SEN: Less than 3.7V
If the values are out of the ranges indicated above, park the
vehicle in a cool place and allow the engine temperature to
stabilize. Do not attempt to reduce the engine coolant or
EGR temperature with a fan or means other than ambient
air. Doing so may produce an inaccurate diagnostic result.
*: Although CONSULT-II screen displays “
−10 to 40°C (14 to 104°F)”
as a range of engine coolant temperature, ignore it.
WITH CONSULT-II
1.
Turn ignition switch OFF and wait at least 10 seconds, then turn ignition switch ON.
2.
Select “EGR SYSTEM P1402” of “EGR SYSTEM” in “DTC WORK SUPPORT” mode with CONSULT-II.
3.
Touch “START”. Follow instruction of CONSULT-II.
4.
Start engine and let it idle until “TESTING” on CONSULT-II screen is turned to “COMPLETED”. (It will take
80 seconds or more.)
EGRC SOL/V
●
Engine: After warming up
●
Air conditioner switch: OFF
●
Shift lever: P or N
●
No-load
Idle
OFF
Engine speed: Revving engine from
idle to 3,000 rpm quickly.
ON
MONITOR ITEM
CONDITION
SPECIFICATION
DTC No.
Trouble Diagnosis Name
DTC Detecting Condition
Possible Cause
P1402
EGR control system stuck open
EGR flow is detected under conditions that
do not call for EGR.
●
EGRC solenoid valve
●
EGR valve leaking or stuck open
●
EGR temperature sensor
●
EGRC-BPT valve
SEF202Y
PBIB1600E
EC-460
[KA24DE]
DTC P1402 EGR FUNCTION
If “TESTING” is not displayed after 5 minutes, turn ignition “OFF” and cool the engine coolant
temperature to the range of
−10 to 50°C (14 to 122°F). Retry from step 1.
5.
Make sure that “OK” is displayed after touching “SELF-DIAG RESULTS”. If “NG” is displayed, refer to
WITH GST
1.
Turn ignition switch ON and select “MODE 1” with GST.
2.
Check that engine coolant temperature is within the range of
−10 to 50°C (14 to 122°F).
3.
Check that voltage between ECM terminal 63 (EGR temperature
sensor signal) and ground is less than 4.5V.
4.
Start engine and let it idle for at least 80 seconds.
5.
Stop engine.
6.
Perform from step 1 to 4.
7.
Select “MODE 3” with GST.
8.
If DTC is detected, go to
EC-462, "Diagnostic Procedure"
●
When using GST, “DTC Confirmation Procedure” should be
performed twice as much as when using CONSULT-II
because GST cannot display MODE 7 (1st trip DTC) con-
cerning this diagnosis. Therefore, using CONSULT-II is rec-
ommended.
PBIB2167E
DTC P1402 EGR FUNCTION
EC-461
[KA24DE]
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EC
Wiring Diagram
UBS00DB5
BBWA0453E
EC-462
[KA24DE]
DTC P1402 EGR FUNCTION
Diagnostic Procedure
UBS00DB6
1.
CHECK VACUUM HOSE
Check vacuum hose for clogging, cracks or improper connection.
Refer to
.
OK or NG
OK (With CONSULT-II)>>GO TO 2.
OK (Without CONSULT-II)>>GO TO 3.
NG
>> Repair or replace vacuum hose.
2.
CHECK EGRC SOLENOID VALVE CIRCUIT
With CONSULT-II
1.
Turn ignition switch ON.
2.
Turn EGRC solenoid valve “ON” and “OFF” in “ACTIVE TEST”
mode with CONSULT-II and check operating sound.
Clicking noise should be heard.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 4.
3.
CHECK EGRC SOLENOID VALVE CIRCUIT
Without CONSULT-II
1.
Turn ignition switch OFF.
2.
Disconnect EGRC solenoid valve harness connector.
3.
Turn ignition switch ON.
4.
Check operating sound of the solenoid valve when disconnecting and reconnecting EGRC solenoid valve
harness connector. (The DTC or the 1st trip DTC for the EGRC solenoid valve will be displayed, however,
ignore it.)
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 4.
SEF109L
SEF716Z
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