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On Board Diagnosis Logic
NGEC0053
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.
쐌 Harness or connectors
(The sensor circuit is open or shorted.)
쐌 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.
쐌 Harness or connectors
(The sensor circuit is open or shorted.)
쐌 Intake air leaks
쐌 Mass air flow sensor
D) A low voltage from the sensor is sent to ECM under
heavy load driving condition.
*: 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
NGEC0054
Perform “PROCEDURE FOR MALFUNCTION A” first. If the 1st
trip DTC cannot be confirmed, perform “PROCEDURE FOR
MALFUNCTION B”. If there is no problem on “PROCEDURE
FOR MALFUNCTION B”, perform “PROCEDURE FOR MAL-
FUNCTION C”. If there is no problem on “PROCEDURE FOR
MALFUNCTION C”, perform “PROCEDURE FOR MALFUNC-
TION 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 5 seconds before
conducting the next test.
SEF058Y
PROCEDURE FOR MALFUNCTION A
NGEC0054S01
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-155.
With GST
Follow the procedure “With CONSULT-II”.
DTC P0100 MASS AIR FLOW SENSOR (MAFS)
KA24DE
On Board Diagnosis Logic
EC-151
FE
CL
MT
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
GI
MA
EM
LC
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