Nissan Frontier D22. Manual - part 489

DTC P1402 EGR FUNCTION

EC-1059

[VG33E]

EGRC-solenoid Valve

The EGRC-solenoid valve responds to signals from the ECM. When
the ECM sends an ON (ground) signal, the coil in the solenoid valve
is energized. Vacuum signal (from the intake manifold collector)
passes through the solenoid valve. The signal then reaches the EGR
valve.
When the ECM sends an OFF signal, a plunger will then move to cut
the vacuum signal from the intake manifold collector to the EGR
valve.

On Board Diagnosis Logic

UBS00DOE

If EGR temperature sensor detects EGR flow under the condition
that does not call for EGR, a high-flow malfunction is diagnosed.

NOTE:
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 tempera-
ture below 40

°C (104°F) when starting DTC confirmation procedure.

DTC Confirmation Procedure

UBS00DOF

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:

●

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 40°C (14 to 104°F)*

EGR TEMP SEN: Less than 4.8V
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

Turn ignition switch OFF and wait at least 5 seconds, then turn ignition switch ON.

SEF318UA

SEF073P

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible Cause

P1402

EGRC-solenoid valve cir-
cuit 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

EC-1060

[VG33E]

DTC P1402 EGR FUNCTION

Select “EGR SYSTEM P1402” of “EGR SYSTEM” in “DTC
WORK SUPPORT” mode with CONSULT-II.

Touch “START”. Follow instruction of CONSULT-II.

Start engine and let it idle until “TESTING” on CONSULT-II
screen is turned to “COMPLETED”. (It will take 60 seconds or
more.)
If “TESTING” is not displayed after 5 minutes, turn ignition
OFF and cool the engine coolant temperature to the range
of

−10 to 40°C (14 to 104°F). Retry from step 1.

Make sure that “OK” is displayed after touching “SELF-DIAG RESULTS”. If “NG” is displayed, refer to

EC-

1063, "Diagnostic Procedure"

WITH GST

Turn ignition switch ON and select MODE 1 with GST.

Check that engine coolant temperature is within the range of

−10 to 40°C (14 to 104°F).

Check that voltage between ECM terminal 63 (EGR temperature sensor signal) and ground is less than
4.8V.

Start engine and let it idle for at least 60 seconds.

Stop engine.

Perform from step 1 to 4.