Infiniti G20 (P11). Manual — part 186
On Board Diagnosis Logic
NCEC0053
DTC No.
Malfunction is detected when ...
Check Items (Possible Cause)
P0100
A)
An excessively high voltage from the sensor is sent
to ECM when engine is not running.
I
Harness or connectors
(The sensor circuit is open or shorted.)
I
Mass air flow sensor
C)
A high voltage from the sensor is sent to ECM
under light load driving condition.
B)
An excessively low voltage from the sensor is sent
to ECM* when engine is running.
I
Harness or connectors
(The sensor circuit is open or shorted.)
I
Intake air leaks
I
Mass air flow sensor
D)
A low voltage from the sensor is sent to ECM under
heavy load driving condition.
E)
A voltage from the sensor exists constantly approx.
1.0V when engine is running.
*: When this malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
Detected items
Engine operating condition in fail-safe mode
Mass air flow sensor circuit
Engine speed will not rise more than 2,400 rpm due to the fuel
cut.
DTC Confirmation Procedure
NCEC0054
Perform “PROCEDURE FOR MALFUNCTION A” first. If the 1st
trip DTC cannot be confirmed, perform “PROCEDURE FOR
MALFUNCTION B and E”. If there is no problem on “PROCE-
DURE FOR MALFUNCTION B and E”, perform “PROCEDURE
FOR MALFUNCTION C”. If there is no problem on “PROCE-
DURE FOR MALFUNCTION C”, perform “PROCEDURE FOR
MALFUNCTION D”.
CAUTION:
Always drive vehicle at a safe speed.
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.
SEF058Y
PROCEDURE FOR MALFUNCTION A
NCEC0054S01
With CONSULT-II
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-159.
With GST
Follow the procedure “With CONSULT-II” above.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0100 MASS AIR FLOW SENSOR (MAFS)
On Board Diagnosis Logic
EC-155
SEF058Y
PROCEDURE FOR MALFUNCTION B AND E
NCEC0054S02
With CONSULT-II
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-159.
With GST
Follow the procedure “With CONSULT-II” above.
NOTE:
If 1st trip DTC is confirmed after more than 5 seconds, there may
be malfunction C.
SEF174Y
PROCEDURE FOR MALFUNCTION C
NCEC0054S03
NOTE:
If engine will not start or stops soon wait at least 10 seconds
with engine stopped (Ignition switch “ON”) instead of running
engine at idle speed.
With CONSULT-II
1)
Turn ignition switch “ON”.
2)
Select “DATA MONITOR” mode with CONSULT-II.
3)
Start engine and warm it up to normal operating temperature.
4)
Run engine for at least 10 seconds at idle speed.
5)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-159.
With GST
Follow the procedure “With CONSULT-II” above.
DTC P0100 MASS AIR FLOW SENSOR (MAFS)
DTC Confirmation Procedure (Cont’d)
EC-156
SEF243Y
SEF175Y
PROCEDURE FOR MALFUNCTION D
NCEC0054S04
With CONSULT-II
1)
Turn ignition switch “ON”.
2)
Start engine and warm it up to normal operating temperature.
If engine cannot be started, go to “Diagnostic Procedure”,
EC-159.
3)
Select “DATA MONITOR” mode with CONSULT-II.
4)
Check the voltage of “MAS A/F SE-B1” with “DATA MONITOR”.
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-159.
If OK, go to following step.
7)
Maintain the following conditions for at least 10 consecutive
seconds.
ENG SPEED
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-159.
SEF534P
Overall Function Check
NCEC0055
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
NCEC0055S01
With GST
1)
Turn ignition switch “ON”.
2)
Start engine and warm it up to normal operating temperature.
3)
Select “MODE 1” with GST.
4)
Check the mass air flow sensor signal 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-159.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0100 MASS AIR FLOW SENSOR (MAFS)
DTC Confirmation Procedure (Cont’d)
EC-157
Wiring Diagram
NCEC0056
TEC697
DTC P0100 MASS AIR FLOW SENSOR (MAFS)
Wiring Diagram
EC-158
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