Toyota Celica 2005 Repair Manual page 271

DI−72
MONITOR DESCRIPTION
If there is a defect in the MAF (Mass Air Flow) 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:
The MAF meter voltage output is less than 0.2 V, or more than 4.9 V, and either condition continues for more
than 3 sec.
MONITOR STRATEGY
Related DTCs
Required sensors/components
Frequency of operation
Duration
MIL operation
Sequence of operation
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is
not present
The typical enabling condition is not avail-
able
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria
Mass air flow meter circuit range check (Fluttering):
Mass air flow meter voltage
Mass air flow meter circuit range check (Low voltage):
Mass air flow meter voltage
Mass air flow meter circuit range check (High voltage):
Mass air flow meter voltage
COMPONENT OPERATING RANGE
Parameter
Mass air flow meter voltage
2005 CELICA (RM1131U)
DIAGNOSTICS −
P0100
Mass air flow meter
Continuous
3 sec.
Immediate (When engine speed is at less than 4,000 rpm)
2 driving cycles (When engine speed is at 4,000 rpm or more)
None
270
ENGINE (1ZZ−FE)
Mass air flow meter circuit range check
(Fluttering)
Mass air flow meter circuit range check
(Low voltage)
Mass air flow meter circuit range check
(High voltage)
See page DI−3
−
Threshold
Less than 0.2 V, or more than 4.9 V
Less than 0.2 V
More than 4.9 V
Standard Value
0.4 to 2.2 V