1A-96 Engine Control System (4HK1)
DTC P0101 (Flash Code 92)
Circuit Description
The mass air flow (MAF) sensor is an air flow meter
that measures the amount of air that enters the engine.
It is fitted between the air cleaner and turbocharger. A
small quantity of air that enters the engine indicates
deceleration or idle speed. A large quantity of air that
enters the engine indicates acceleration or a high load
condition. The ECM will calculate a predicted MAF
value and compares the actual MAF sensor voltage
signal to the predicted MAF value. This comparison will
determine if the signal is stuck, or is too low or too high
for a given operating condition. If the ECM detects that
the actual MAF sensor signal voltage is not within a
predetermined range of the calculated MAF value, this
DTC will set.
Condition for Running the DTC
• DTCs P0045, P0079, P0080, P0102, P0103,
P0107, P0108, P0112, P0113, P0116, P0117,
P0118, P0122, P0123, P0234, P0404, P0409,
P0560, P060B, P0638, P0651, P0697, P1404,
P2227, P2228, P2229, U0073 and U0110 are not
set.
• The battery voltage is between 18 to 32 volts.
• The ignition switch is ON.
AND following conditions are met longer than 3
seconds
• The engine speed is less than 1500 RPM or
between 2500 to 2800 RPM.
• The EGR control is commanded OFF.
• The intake throttle control is commanded OFF.
• The DPD filter regeneration is inactive.
• The engine run time is longer than 5 seconds.
Condition for Setting the DTC
• The ECM detects that the MAF sensor signal
voltage is not within a predetermined range of the
calculated MAF value for longer than 10 seconds.
Action Taken When the DTC Sets
• The ECM illuminates the MIL on the second
consecutive driving cycle when the diagnostic runs
and fails. Refer to DTC Type Definitions for Action
Taken When the DTC Sets - Type B.
• The ECM inhibits EGR control.
Condition for Clearing the DTC
• Refer to DTC Type Definitions for Condition for
Clearing the MIL/ DTC - Type B.
Diagnostic Aids
• Any unmetered air that enters the engine
downstream of the MAF sensor will cause this
DTC to set.
• High resistance in the MAF sensor circuit may set
this DTC.
• A short between the signal circuit of the MAF
sensor and the signal circuit of the intake air
temperature (IAT) sensor will skew the MAF
sensor lower than normal at higher air flows.
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Controls
Connector End Views or ECM Connector End Views
Circuit/ System Testing DTC P0101
Step Action Value(s) Yes No
1
Did you perform the Diagnostic System Check
- Engine Controls?
—
Go to Step 2
Go to Diagnostic
System Check -
Engine Controls
LG4HKED-WE-0871.book 96 ページ ２００７年１１月２９日 木曜日 午後６時２９分
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