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Infiniti Q45 (FY33). Manual - part 224

Diagnostic Trouble

Code No.

Malfunction is detected when ...

Check Items

(Possible Cause)

P1402
0514

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

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:

Always perform the test at 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 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.

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

(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

detected,

“DIAGNOSTIC

PROCEDURE”, EC-428.

1) Turn ignition switch “ON”.
2) Check the following voltages.

ECM terminal

(Engine coolant temperature) and

ground:

2.7 - 4.4V

ECM terminal

(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

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.

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

and

engine ground.

5. Check operating sound of the

solenoid valve when disconnect-
ing and reconnecting the jumper
wire.

Repair or replace EGRC-
solenoid valve or repair
circuit.

CHECK COMPONENT
(EGRC-solenoid valve).
Refer to “COMPONENT INSPECTION”,
EC-430.

Replace EGRC-solenoid
valve.

CHECK COMPONENT
(EGR valve).
Refer to “COMPONENT INSPECTION” on
430.

Replace EGR valve.

(Go to next page.)

TROUBLE DIAGNOSIS FOR DTC P1402

EGR Function (Open) (Cont’d)

EC-428

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