Infiniti Q45 (FY33). Manual — part 224
Diagnostic Trouble
Code No.
Malfunction is detected when ...
Check Items
(Possible Cause)
P1402
0514
I
EGR flow is detected under conditions that do not
call for EGR.
I
EGRC-solenoid valve
I
EGR valve leaking or stuck open
I
EGR temperature sensor
I
EGRC-BPT valve
SEF808X
SEF753X
PEF245V
PEF246V
DIAGNOSTIC TROUBLE CODE CONFIRMATION
PROCEDURE
NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn ignition
switch “OFF” and wait at least 5 seconds before conducting
the next test.
TESTING CONDITION:
I
Always perform the test at temperature above −10°C
(14°F).
I
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 tempera-
ture to stabilize. Do not attempt to reduce the coolant or
EGR temperature with a fan or means other than ambient
air. Doing so may produce an inaccurate diagnostic result.
1) Turn ignition switch “OFF” and wait at least 5 seconds.
Then turn ignition switch “ON”.
2) Select “EGR SYSTEM P1402” of “EGR SYSTEM” in
“DTC WORK SUPPORT” mode with CONSULT-II.
3) Follow instruction of CONSULT-II.
4) Start engine and let it idle until “TESTING” on CON-
SULT-II screen is turned to “COMPLETED”. (It will take
70 seconds or more.)
If “TESTING” is not displayed after 5 minutes, turn igni-
tion “OFF” and cool the engine coolant temperature to
the range of −10 to 40°C (14 to 104°F). Retry from step
1).
5) Make sure that “OK” is displayed after touching “SELF-
DIAG RESULTS”. If “NG” is displayed, refer to “DIAG-
NOSTIC PROCEDURE”, EC-428.
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P1402
EGR Function (Open) (Cont’d)
EC-425
SEF236Y
SEF443U
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1) Turn ignition switch “ON” and select “MODE 1” with
GST.
2) Check that engine coolant temperature is within the
range of −10 to 40°C (14 to 104°F).
3) Check that voltage between ECM terminal
q
75
(EGR
temperature) and ground is less than 4.8V.
4) Start engine (TCS switch “OFF”) and let it idle for at
least 70 seconds.
5) Stop engine.
6) Perform the step 1) to 4) again.
7) Select “MODE 3” with GST.
8) If
DTC
is
detected,
go
to
“DIAGNOSTIC
PROCEDURE”, EC-428.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1) Turn ignition switch “ON”.
2) Check the following voltages.
ECM terminal
q
67
(Engine coolant temperature) and
ground:
2.7 - 4.4V
ECM terminal
q
75
(EGR temperature) and ground:
Less than 4.8V
3) Start engine and let it idle for at least 70 seconds.
4) Turn ignition “OFF” and wait at least 5 seconds.
5) Perform “Diagnostic Test Mode II” (Self-diagnostic
results) with ECM.
6) If 1st trip DTC is detected, go to “DIAGNOSTIC
PROCEDURE”, EC-428.
When using GST, “DIAGNOSTIC TROUBLE CODE CONFIRMA-
TION PROCEDURE” should be performed twice as much as
when using CONSULT-II or ECM (Diagnostic Test Mode II)
because GST cannot display MODE7 (1st trip DTC) concern-
ing this diagnosis. Therefore, using CONSULT-II or ECM (Diag-
nostic Test Mode II) is recommended.
TROUBLE DIAGNOSIS FOR DTC P1402
EGR Function (Open) (Cont’d)
EC-426
TEC057M
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P1402
EGR Function (Open) (Cont’d)
EC-427
SEF109L
DIAGNOSTIC PROCEDURE
SEF764X
SEF358W
INSPECTION START
CHECK VACUUM HOSE.
Check vacuum hose for clogging, cracks
or improper connection or misconnecting.
Refer to “Vacuum Hose Drawing”, EC-19.
OK
E
NG
Repair it.
CHECK COMPONENT
(EGRC-solenoid valve).
1. Turn ignition switch “ON”.
2. Turn EGRC-solenoid valve “ON”
and “OFF” in “ACTIVE TEST”
mode with CONSULT-II and
check operating sound.
-------------------------------------------------------------------------------------------------------------------------------------- OR --------------------------------------------------------------------------------------------------------------------------------------
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness con-
nector.
3. Turn ignition switch “ON”.
4. Connect a suitable jumper wire
between ECM terminal
q
10
and
engine ground.
5. Check operating sound of the
solenoid valve when disconnect-
ing and reconnecting the jumper
wire.
OK
E
NG
Repair or replace EGRC-
solenoid valve or repair
circuit.
CHECK COMPONENT
(EGRC-solenoid valve).
Refer to “COMPONENT INSPECTION”,
EC-430.
OK
E
NG
Replace EGRC-solenoid
valve.
CHECK COMPONENT
(EGR valve).
Refer to “COMPONENT INSPECTION” on
430.
OK
E
NG
Replace EGR valve.
q
A
(Go to next page.)
TROUBLE DIAGNOSIS FOR DTC P1402
EGR Function (Open) (Cont’d)
H
H
H
H
H
EC-428
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