DTC P0102: Mass or Volume Air Flow Circuit Low Input; DTC P0103: Mass or Volume Air Flow Circuit High Input: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Clear DTCs, Refer to DTC CHECK / CLEAR .
5. Start the engine and warm it up.
6. Allow the engine to idle 1 minute or more.
7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
8. Read DTCs.

   Result

   Result	Proceed to
   P0102 or P0103	A
   No output	B

B → See step   9 

A: Go to next step 

1. Read the values using the Techstream (MAF).
   NOTE:

   • Turn the ignition switch to OFF.
   • Perform the inspection with the vehicle indoors and on a level surface.
   • Perform the inspection of the mass air flow meter while it is installed in the air cleaner case (installed on the vehicle).
   • During the test, do not use the exhaust pipe.
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch to ON (do not start the engine).
   3. Turn the Techstream on.
   4. Enter the following menus: Powertrain / Engine and ECT / Data List / MAF.
   5. Wait for 30 seconds, and read the values on the tester.

      Result

      Result	Proceed to
      0.00 g/sec	A
      More than 0.22 g/sec	B

B → See step   7 

A: Go to next step 

Fig 1: Identifying Mass Air Flow Meter Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the mass air flow meter connector.
2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   C23-3 (+B) - Body ground	Ignition switch ON	11 to 14 V

4. Reconnect the mass air flow meter connector.

NG → See step   6 

OK: Go to next step 

Fig 2: Identifying Mass Air Flow Meter Connection

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the mass air flow meter with the wire harness connector connected.
2. Connect the Techstream to the DLC3.
3. Turn the ignition switch to ON.
4. Turn the Techstream on.
5. Enter the following menus: Powertrain / Engine and ECT / Data List / MAF.
6. Check the MAF value when air is blown to the mass air flow meter, as shown in the illustration.

   OK

   The MAF value changes.

NG → See step   10 

OK: Go to next step 

Fig 3: Identifying Mass Air Flow Meter And ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the mass air flow meter connector.
2. Disconnect the ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   C23-5 (VG) - C19-118 (VG)	Always	Below 1 Ω
   C23-4 (E2G) - C19-116 (E2G)

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   C23-5 (VG) or C19-118 (VG) - Body ground	Always	10 kΩ or higher

4. Reconnect the mass air flow meter connector.
5. Reconnect the ECM connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   11 

Fig 4: Identifying Mass Air Flow Meter And Integration Relay Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the mass air flow meter connector.
2. Remove the integration relay (EFI relay) from the engine room relay block.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   C23-3 (+B) - 1A-4	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   C23-3 (+B) or 1A-4 - Body ground	Always	10 kΩ or higher

4. Reconnect the mass air flow meter connector.
5. Reinstall the integration relay.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   12 

Fig 5: Identifying Mass Air Flow Meter Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the mass air flow meter connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C23-4 (E2G) - Body ground	Always	Below 1 Ω

3. Reconnect the mass air flow meter connector.

NG → See step   8 

OK → See step   13 

Fig 6: Identifying Mass Air Flow Meter And ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the mass air flow meter connector.
2. Disconnect the ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   C23-5 (VG) - C19-118 (VG)	Always	Below 1 Ω
   C23-4 (E2G) - C19-116 (E2G)

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   C23-5 (VG) or C19-118 (VG) - Body ground	Always	10 kΩ or higher

4. Reconnect the mass air flow meter connector.
5. Reconnect the ECM connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   14