Infiniti Q45 (FY33). Manual - part 149

DIAGNOSTIC TROUBLE CODE CONFIRMATION
PROCEDURE

Perform “Procedure for malfunction A” first.
If 1st trip DTC cannot be confirmed, perform “Procedure for
malfunction B”.
If there is problem in “Procedure for malfunction B”, perform
“Procedure for malfunction C”. If there is no problem on “Pro-
cedure for malfunction C”, perform “Procedure for malfunc-
tion D”.

CAUTION:

Always drive vehicle at a safe speed.
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.

SEF399X

Procedure for malfunction A

1) Turn ignition switch “ON”.
2) Select “DATA MONITOR” mode with CONSULT-II.
3) Wait at least 6 seconds.
4) If 1st trip DTC is detected, go to “DIAGNOSTIC

PROCEDURE”, EC-129.

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Follow the procedure “With CONSULT-II” above.

SEF400X

Procedure for malfunction B

1) Turn ignition switch “ON”.
2) Select “DATA MONITOR” mode with CONSULT-II.
3) Start engine and wait 5 seconds at most.
4) If 1st trip DTC is detected, go to “DIAGNOSTIC

PROCEDURE”, EC-129.

Follow the procedure “With CONSULT-II” above.

IDX

TROUBLE DIAGNOSIS FOR DTC P0100

Mass Air Flow Sensor (MAFS) (Cont’d)

EC-125

SEF261Y

Procedure for malfunction C

NOTE:
If the engine will not start or stop soon, wait at least 10 sec-
onds with engine off (ignition switch “ON”), instead of running
engine at idle speed.

1) Turn ignition switch “ON”.
2) Select “DATA MONITOR” mode with CONSULT-II.
3) Start engine and warm it up to normal operating tem-

perature.

4) Wait at least 10 seconds at idle speed.
5) If 1st trip DTC is detected, go to “DIAGNOSTIC

PROCEDURE”, EC-130.

Follow the procedure “With CONSULT-II” above.

TROUBLE DIAGNOSIS FOR DTC P0100

Mass Air Flow Sensor (MAFS) (Cont’d)

EC-126

SEF697TA

SEF534P

SEF375U

Procedure for malfunction D

1) Turn ignition switch “ON”.
2) Start engine (TCS switch “OFF”) and warm it up to nor-

mal operating temperature.
If engine cannot be started, go to “DIAGNOSTIC
PROCEDURE, EC-129.

3) Select “DATA MONITOR” mode with CONSULT-II.
4) Check the voltage of MAS AIR/FL SE with “DATA MONI-

TOR”.

5) Increases engine speed to about 4,000 rpm.
6) Monitor the linear voltage rise in response to engine

speed increases.
If NG, go to “DIAGNOSTIC PROCEDURE”, EC-129.
If OK, go to following step.

7) Maintain the following conditions for at least 10 con-

secutive seconds.
CMPS-RPM (POS): More than 2,000 rpm
THRTL POS SEN: More than 3V
Selector lever: Suitable position
Driving location: Driving vehicle uphill (Increased

engine load) will help maintain

the driving conditions required
for this test.

8) If 1st trip DTC is detected, go to “DIAGNOSTIC

PROCEDURE”, EC-130.

OVERALL FUNCTION CHECK

Use this procedure to check the overall function of the mass air flow
sensor circuit. During this check, a 1st trip DTC might not be con-
firmed.

Procedure for malfunction D

1) Turn ignition switch “ON”.
2) Start engine and warm it up to normal operating tem-

perature.

3) Select “MODE 1” with GST.
4) Check the mass air flow with “MODE 1”.
5) Check for linear mass air flow rise in response to

increases to about 4,000 rpm in engine speed.

6) If NG, go to “DIAGNOSTIC PROCEDURE”, EC-130.

1) Turn ignition switch “ON”.
2) Start engine and warm it up to normal operating tem-

perature.

3) Check the voltage between ECM terminal

and

ground.

4) Check for linear voltage rise in response to increases to

about 4,000 rpm in engine speed.

5) If NG, go to “DIAGNOSTIC PROCEDURE”, EC-130.

IDX

TROUBLE DIAGNOSIS FOR DTC P0100

Mass Air Flow Sensor (MAFS) (Cont’d)

EC-127

TEC015M

TROUBLE DIAGNOSIS FOR DTC P0100

Mass Air Flow Sensor (MAFS) (Cont’d)

EC-128

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