P0101 - Toyota Corolla 2002 Repair Manual Supplement

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DTC
CIRCUIT DESCRIPTION
Refer to DTC P0100 on page 05 -- 55
DTC No.
Either of following conditions is met:
S MAF meter output does not change to less than 1.6 V within
approximately 10 s econds of ignition switch being turned from
ON to OFF (whi l e E FI M A I N rel ay i s ON)
(Determination of a malfunction is conducted within a given
time after the ignition switch is turned from ON to OFF. If a

P0101

malfunction is detected within this time, the MIL is illuminated
and a DTC is set when the i gnition switch is next turned to ON)
S Actual value of MAF rate is implausible
(The MIL i s illuminated and a DTC is set when the s ame mal -
function is detected on 2 consecutive trips*
*: One trip i s c ounted when the i gnition switch is turned from
OFF to ON and back to OFF)
HINT:
This DTC is set in either of the following conditions:
When the ignition switch is turned from OFF to ON.
S
When the v ehicle decelerates while driving.
S
INSPECTION PROCEDURE
HINT:
Read freeze frame data using an intelligent tester ll. Freeze frame data record the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data c an help determine if the v ehicle was
moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction oc -
curred.
1 CHECK OTHER DTC OUTPUT(IN ADDITION TO DTC P0101)
(a) Connect an intelligent tester ll to the DLC3.
(b) Turn the ignition switch to ON and turn the intelligent tester ll ON.
(c) Select the following menu items: Powertrain / Engine and ECT / DTC.
(d) Read DTCs.
Result:
Display (DTC Output)
P0101 and other DTCs
HINT:
If any DTCs other than P0101 are output, troubleshoot those DTCs first.
A
COROLLA Supplement (RM1129E)
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DIAGNOSTICS
P0101 MASS OR VOLUME AIR FLOW CIRCUIT
RANGE/PERFORMANCE PROBLEM
.
DTC Detection Condition
P0101
TOYOTA COROLLA REPAIR MANUAL SUPP 1129E
-- ECD SYSTEM (1ND -- TV)
S Open or short i n mass air flow meter c ircuit
S Mass air flow meter
S Contamination i n mass air flow meter
S EGR v alve assembly
S Open or short i n E GR circuit
S EGR passage
S Open or short i n i ntake s hutter c ontrol m otor circuit
S Intake shutter
S Vacuum hose
S ECM
B GO TO RELEVANT DTC CHART
(See page 05 - - 41 )
Trouble A reas
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A
B
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05 - - 61
05MRP--01