DI
−
372
−
DIAGNOSTICS
ENGINE (2ZZ
−
GE)
2005 CELICA (RM1131U)
DTC
P0101
Mass or Volume Air Flow Circuit Range/
Performance Problem
CIRCUIT DESCRIPTION
Refer to DTC P0100 on page DI
−
372.
DTC No.
DTC Detecting Condition
Trouble Area
P0101
S
High voltage:
Conditions (a), (b) and (c) continue for more than 10 seconds
(2 trip detection logic):
(a) Engine speed less than 2,000 rpm
(b) Engine coolant temperature 70
°
C (158
°
F) or higher
(c) Voltage output of Mass Air Flow (MAF) meter more than 2.2
V (varies with Throttle Position [TP] sensor voltage)
S
Low voltage:
Conditions (a) and (b) continue for more than 10 seconds
(2 trip detection logic):
(a) Engine speed more than 300 rpm
(b) Voltage output of MAF meter less than 0.93 V
(varies with TP sensor voltage)
S
Mass air flow meter
MONITOR DESCRIPTION
The MAF (Mass Air Flow) meter helps the ECM calculate the amount of air flowing through the throttle valve.
The ECM uses this information to determine the fuel injection time and provide a proper air fuel ratio. Inside
the MAF meter, there is a heated platinum wire exposed to the flow of intake air. By applying a specific current
to the wire, the ECM heats this wire to a given temperature. The flow of incoming air cools the wire and an
internal thermistor, changing their resistance. To maintain a constant current value, the ECM varies the volt-
age applied to these components in the MAF meter. The voltage level is proportional to the air flow through
the MAF meter. The ECM interprets this voltage as the intake air amount. If there is a defect in the MAF meter
or an open or short circuit, the voltage level will deviate from the normal operating range. The ECM interprets
this deviation as a defect in the MAF meter and sets a DTC.
Example:
If the voltage is more than 2.2 V with idling or less than 0.4 V without idling, the ECM interprets this as a defect
in the MAF meter and sets a DTC.
MONITOR STRATEGY
Related DTCs
P0101
Mass air flow meter rationality
Required sensors/components
Main sensors/components
Mass air flow meter
Related sensors/components
Engine speed sensor, Engine coolant tempera-
ture sensor, Throttle position sensor
Frequency of operation
Continuous
Duration
10 sec.
MIL operation
2 driving cycles
Sequence of operation
None
DI09C
−
28
570
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