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SEF243Y
SEF175Y
PROCEDURE FOR MALFUNCTION D
NHEC0054S04
CAUTION:
Always drive vehicle at a safe speed.
With CONSULT-II
NHEC0054S0402
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-157.
3) Select “DATA MONITOR” mode with CONSULT-II.
4) Check the voltage of MAS AIR/FL SE 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-157.
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-157.
SEF534P
Overall Function Check
NHEC0055
PROCEDURE FOR MALFUNCTION D
NHEC0055S01
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.
With GST
NHEC0055S0101
1) Start engine and warm it up to normal operating temperature.
2) Select “MODE 1” with GST.
3) Check the mass air flow sensor signal with “MODE 1”.
4) Check for linear mass air flow sensor signal value rise in
response to increases to about 4,000 rpm in engine speed.
5) If NG, go to “Diagnostic Procedure”, EC-157.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0100 MASS AIR FLOW SENSOR (MAFS)
DTC Confirmation Procedure (Cont’d)
EC-155
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