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. Start the engine.
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / MAF.
5. Read the values displayed on the Techstream.
   RESULT
   
   

   Result	Proceed to
   0.0 g/sec.	A
   271.0 g/sec. or more	B
   Between 1.0 and 270.0 g/sec.*	C

   HINT: 

   *: The value changes when the throttle valve is open or closed with the engine running.

B → See step   6 

C → See step   8 

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
   B1-3 (+B) - Body ground	Ignition switch ON	11 to 14 V

4. Reconnect the mass air flow meter connector.

NG → See step   5 

OK: Go to next step 

1. Inspect output voltage.
   Fig 2: Identifying Mass Air Flow Meter Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Disconnect the mass air flow meter connector.
   2. Apply battery voltage across terminals +B and E2G.
   3. Connect the positive (+) tester probe to terminal VG, and the negative (-) tester probe to terminal E2G.
   4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection	Condition	Specified Condition
      5 (VG) - 4 (E2G)	Battery voltage applied across terminal +B and E2G	0.2 to 4.9 V

   5. Reconnect the mass air flow meter connector.

NG → See step   9 

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
   B1-5 (VG) - B30-94 (VG)	Always	Below 1 Ω
   B1-4 (E2G) - B30-117 (E2G)

   Standard Resistance (Check for short)

   Tester Connection	Condition	Specified Condition
   B1-5 (VG) or B30-94 (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   10 

Fig 4: Checking Harness And Connector (Mass Air Flow Meter - Integration Relay)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the mass air flow meter connector.
2. Remove the integration relay (EFI MAIN relay) from the engine room No. 1 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
   B1-3 (+B) - 1A-4	Always	Below 1 Ω

   Standard Resistance (Check for short)

   Tester Connection	Condition	Specified Condition
   B1-3 (+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   11 

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
   B1-4 (E2G) - Body ground	Always	Below 1 Ω

3. Reconnect the mass air flow meter connector.

NG → See step   7 

OK → See step   12 

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
   B1-5 (VG) - B30-94 (VG)	Always	Below 1 Ω
   B1-4 (E2G) - B30-117 (E2G)

   Standard Resistance (Check for short)

   Tester Connection	Condition	Specified Condition
   B1-5 (VG) or B30-94 (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   13