Dtc P0101 Mass Or Volume Air Flow Circuit Range / Performance Problem


DESCRIPTION

INSPECTION PROCEDURE

CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0101)

CHECK AIR INDUCTION SYSTEM

REPLACE MASS AIR FLOW METER

REPAIR OR REPLACE AIR INDUCTION SYSTEM

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

DTC P0101 Mass or Volume Air Flow Circuit Range / Performance Problem


DESCRIPTION

Refer to DTC P0102 (LandCruiser RM00000187J09CX.html).

P0101
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
After warming up engine, idle engine for 20 seconds, and then maintain engine at 3000 rpm for 20 seconds
After the engine is warmed up, condition (a) continues for more than 10 seconds when idling (2 trip detection logic):
(a) Mass air flow meter output is higher than 4.4 V.
  1. Air induction system
  2. Mass air flow meter
Conditions (a) and (b) continue for more than 10 seconds with the engine speed at 1250 rpm or more (2 trip detection logic):
(a) VTA is higher than 0.1 V.
(b) Mass air flow meter output is below 0.7 V.

Related Data List
DTC No.
Data List
P0101
  1. MAF
  2. Actual EGR Valve Pos.
  3. Actual Throttle position
HINT:
  1. If DTC P0101 is stored due to the mass air flow meter output voltage being too low, the ECU mistakenly determines that there is less air than the actual intake air amount and EGR is decreased to match the target EGR. As a result, the following symptom may appear:
    1. Combustion noise worsens
  2. If DTC P0101 is stored due to the MAF meter output voltage being too high, the ECU mistakenly determines that there is more air than the actual intake air amount and EGR is increased to match the target EGR. As a result, the following symptoms may appear:
    1. Misfire
    2. White smoke
    3. Black smoke

INSPECTION PROCEDURE

HINT:
Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.
1.CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0101)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the intelligent tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC.

  1. Read the DTCs.

    Result
    Result
    		Proceed to
    P0101 and other DTCs are output
    		A
    P0101 is output
    		B

    HINT:
    If codes other than P0101 are output, perform troubleshooting for those DTCs first.


A
GO TO DTC CHART (LandCruiser RM0000031HW07LX.html)
B


2.CHECK AIR INDUCTION SYSTEM

  1. Check the air induction system for vacuum leakage (LandCruiser RM000001A3W03QX_01_0008.html).

    OK:
    No leakage from air induction system.


NG
Go to step 4
OK


3.REPLACE MASS AIR FLOW METER

  1. Replace the mass air flow meter (LandCruiser RM000000VHD05OX.html).



NEXT
Go to step 5

4.REPAIR OR REPLACE AIR INDUCTION SYSTEM

  1. Repair or replace the air induction system.


NEXT


5.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Connect the intelligent tester to the DLC3.

  1. Clear the DTCs (LandCruiser RM000000PDK1DJX.html).

  1. Turn the ignition switch off.

  1. Start the engine.

  1. After warming up the engine, idle the engine for 20 seconds, and then maintain the engine at 3000 rpm for 20 seconds.

  1. Confirm that the DTC is not output again.

    HINT:
    Perform the following procedure using the tester to determine whether or not the DTC judgment has been carried out.

    1. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

    2. Input DTC P0101.

    3. Check that STATUS is NORMAL. If STATUS is INCOMPLETE or N/A, maintain the engine at 3000 rpm for 30 seconds, and then idle the engine for 5 minutes.


NEXT

END