Infiniti G20 (P11). Manual — part 274
NOTE:
Diagnosis for this DTC will occur when engine coolant temperature
is below 50 to 60°C (122 to 140°F). Therefore, it will be better to
turn ignition switch “ON” (start engine) at the engine coolant tem-
perature below 30°C (86°F) when starting DTC confirmation
procedure.
Possible Cause
NCEC0581
I
Harness or connectors
(EGR volume control valve circuit is open or shorted.)
I
EGR volume control valve leaking or stuck open
I
EGR temperature sensor
SEF202Y
SEF203Y
DTC Confirmation Procedure
NCEC0582
NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 10 seconds
before conducting the next test.
TESTING CONDITION:
I
Always perform the test at a 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 50°C (14 to 122°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 engine cool-
ant temperature or EGR temperature with a fan or means
other than ambient air. Doing so may produce an inaccu-
rate diagnostic result.
*: Although CONSULT-II screen displays “–10 to 40°C (14 to
104°F)” as a range of engine coolant temperature, ignore it.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1402 EGR FUNCTION (OPEN)
On Board Diagnosis Logic (Cont’d)
EC-507
SEF204Y
SEF236Y
SEF947X
WITH CONSULT-II
NCEC0582S01
1)
Turn ignition switch “OFF”, and wait at least 10 seconds, and
then turn “ON”.
2)
Select “EGR SYSTEM P1402” of “EGR SYSTEM” in “DTC
WORK SUPPORT” mode with CONSULT-II.
3)
Touch “START”.
4)
Start engine and let it idle until “TESTING” on CONSULT-II
screen is turned to “COMPLETED”. (It will take 80 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 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
“Diagnostic
Procedure”, EC-510.
WITH GST
NCEC0582S02
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 72 (EGR tempera-
ture sensor signal) and ground is less than 4.8V.
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 “Diagnostic Procedure”, EC-510.
I
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
recommended.
DTC P1402 EGR FUNCTION (OPEN)
DTC Confirmation Procedure (Cont’d)
EC-508
Wiring Diagram
NCEC0583
TEC836
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1402 EGR FUNCTION (OPEN)
Wiring Diagram
EC-509
Diagnostic Procedure
NCEC0584
1
CHECK EGR VOLUME CONTROL VALVE POWER SUPPLY CIRCUIT
1. Disconnect EGR volume control valve harness connector.
SEF849X
2. Turn ignition switch ON.
3. Check voltage between EGR volume control valve terminals 2, 5 and ground with CONSULT-II or tester.
SEF327X
OK or NG
OK
©
GO TO 3.
NG
©
GO TO 2.
2
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors F23, M49
I
Harness for open or short between ECM relay and EGR volume control valve
©
Repair harness or connectors.
DTC P1402 EGR FUNCTION (OPEN)
Diagnostic Procedure
EC-510
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