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

for Preparation Click here

DESCRIPTION

HINT:

1. If DTC P0101 is stored, the following symptoms may appear:
   
1. Black smoke
   
2. Poor acceleration
   
3. Combustion noise worsens
   
4. Lack of power due to a fail-safe operation
   

INSPECTION PROCEDURE

NOTICE:

1. When replacing the ECM, the ECM needs Registration and Initialization (Click here).
   
2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
   

HINT:

1. When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the intelligent tester. Then after installing the new ECM, perform all of the initializations/registrations for the "Learning Values Write" function by following the instructions shown on the tester display.
   
2. 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. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch to ON and turn the tester on.
   

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

4. Read DTCs.
   

   Result 

   Result	Proceed to
   DTC P0101	A
   DTC P0101 and other DTCs	B

   HINT:

   If any DTCs other than P0101 are output, troubleshoot those DTCs first.

B	GO TO DTC CHART (Click here)

A

HINT:

1. Check the vacuum hose connection of the turbo pressure sensor.
   
2. Check that there is no air leak of the turbo pressure sensor vacuum hose.
   

   OK:

   The vacuum hoses are appropriately connected to each other.
   

NG	Go to step 12

OK

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch ON and turn the tester on.
   

3. Enter the following menus: Powertrain / Engine and ECT / Data List / MAF and Coolant Temp.
   

4. Allow the engine to idle until the Coolant Temp reaches 75°C (167°F) or more.
   

5. Read the MAF with the engine in an idling condition and at an engine speed of 2000 rpm.
   

   Standard:

   Item	Condition	Specified Condition
   MAF	Idling	3.5 to 12 g/sec
   	2000 rpm	10 to 40 g/sec

   HINT:

   1. The shift lever should be in N and the A/C switch and all accessory switches should be off.
      
   2. When read the values of data list, confirm that PM regeneration is not activating (value of "After Injection Period" is 0) by entering the following menus: Powertrain / Engine and ECT / Data List / After Injection Period.
      If PM regeneration is activating (value of "After Injection Period" is not 0), drive the vehicle until the PM regeneration is complete (value of "After Injection Period" becomes 0).
      
   3. When idling, EGR cut occurs under either of the following conditions:
      
   1. PM regeneration is activating.
      
   2. Idling time is long.
      

   If EGR is cut off when idling and PM regeneration is not activating, drive the vehicle in 5th gear at 70 km/h for 10 minutes or more.

NG	Go to step 8

OK

1. Check for air leaks and any blockages between the air cleaner case and the turbocharger, and between the turbocharger and the intake manifold.
   

   OK:

   No air leak or blockages.
   

NG	Go to step 13

OK

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch to ON and turn the tester on
   

3. Enter the following menus: Powertrain / Engine and ECT / Data List / MAP and Atmosphere Pressure.
   

4. Compare the values when the ignition switch is ON.
   

   Standard:

   Difference between the MAP and the Atmosphere Pressure is less than 7 kPa.
   

   HINT:

   Standard atmospheric pressure is 101 kPa. For every 100 m increase in altitude, pressure drops by 1 kPa. Varies by weather.

NG	Go to step 11

OK

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch to ON and turn the tester on.
   

3. Enter the following menus: Powertrain / Engine and ECT / Active Test / Diesel Throttle Target Angle.
   

4. When changing the Active Test value from 0 to 90%, check that Actual Throttle Position smoothly changes to the set opening angle.
   

   OK:

   Value smoothly changes to the set opening angle.
   

NG	Go to step 9

OK

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch to ON and turn the tester on.
   

3. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position.
   

4. When changing the Active Test value from 0 to 100%, check that Actual EGR Valve Pos. smoothly changes to the set opening angle.
   

   OK:

   Value smoothly changes to the set opening angle.
   

NG	Go to step 10

OK

1. Replace the intake mass air flow meter assembly (Click here).
   

NEXT	Go to step 14

1. Replace the diesel throttle body assembly (Click here).
   

2. Turn the ignition switch from ON to OFF and wait for 30 seconds or more.
   

NEXT	Go to step 14

1. Replace the electric EGR valve assembly (Click here).
   

2. Turn the ignition switch to ON.
   

3. Turn the ignition switch off and wait for 30 seconds of more.
   

NEXT	Go to step 14

1. Replace the turbo pressure sensor (Click here).
   

NEXT	Go to step 14

NEXT	Go to step 14

NEXT

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch to ON and turn the tester on.
   

3. Clear the DTCs (Click here).
   

4. Start the engine and ward it up until the engine coolant temperature sensor reaches 70°C (158°F) or more.
   

5. Drive the vehicle in 3rd gear, decelerate from more than 2600 rpm to 1200 rpm when accelerator pedal fully released.
   

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

7. Confirm that the DTC is not output again.
   

NEXT
END