DTC P0100: Mass or Volume Air Flow Circuit; 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. On the Techstream, select the following menu items: Powertrain / Engine and ECT / Data List / All Data / MAF.
5. Read the values displayed on the Techstream.

   Result

   Mass Air Flow Rate (gm/s)	Proceed to
   0.0	A
   271.0 or more	B
   Between 1.0 and 270.0*	C

   HINT: 

   *: The value must change when the throttle valve is opened or closed.

C → See step   8 

B → See step   6 

A: Go to next step 

1. Disconnect the M1 MAF meter connector.
   Fig 1: Identifying M1 MAF Meter Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the ignition switch to the ON position.
3. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Specified Condition
   +B (M1-3) - Body ground	11 to 14 V

4. Reconnect the MAF meter connector.

NG → See step   5 

OK: Go to next step 

1. Start the engine.
   Fig 2: Identifying EG2 And VG Terminal Of ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   HINT: 

   The transmission gear selector lever should be in the P or N position and the A/C switch should be turned off.

   Standard voltage

   Tester Connection	Condition	Specified Condition
   VG (E7-28) - E2G (E7-30)	Engine idling	0.5 to 3.0 V

NG → See step   4 

OK → See step   9 

1. Disconnect the M1 MAF meter connector.
   Fig 3: Identifying E2G And VG Terminal Of MAF Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the E7 ECM connector.
   Fig 4: Disconnecting E7 ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Specified Condition
   VG (M1-5) - VG (E7-28)	Below 1 Ω
   E2G (M1-4) - E2G (E7-30)	Below 1 Ω
   VG (M1-5) or VG (E7-28) - Body ground	10 kΩ or higher

4. Reconnect the MAF meter connector.
5. Reconnect the ECM connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   10 

1. Inspect the EFI fuse.
   Fig 5: Identifying EFI Relay, EFI Fuse And MAF Meter Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Remove the EFI fuse from the engine room relay block.
   2. Measure the EFI fuse resistance.

      Standard resistance

      Below 1 Ω

   3. Reinstall the EFI fuse.
2. Remove the EFI relay from the engine room relay block.
3. Disconnect the M1 MAF meter connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Specified Condition
   +B (M1-3) - EFI relay (3)	Below 1 Ω
   +B (M1-3) or EFI relay (3) - Body ground	10 kΩ or higher

5. Reinstall the EFI relay.
6. Reconnect the MAF meter connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   11 

1. Measure the resistance according to the value(s) in the table below.
   Fig 6: Identifying E2G Terminal Of ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Specified Condition
   E2G (E7-30) - Body ground	Below 1 Ω

NG → See step   12 

OK: Go to next step 

1. Disconnect the M1 MAF meter connector.
   Fig 7: Identifying E2G And VG Terminal Of MAF Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the E7 ECM connector.
   Fig 8: Disconnecting E7 ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Specified Condition
   VG (M1-5) - VG (E7-28)	Below 1 Ω
   E2G (M1-4) - E2G (E7-30)	Below 1 Ω
   VG (M1-5) or VG (E7-28) - Body ground	10 kΩ or higher

4. Reconnect the MAF meter connector.
5. Reconnect the ECM connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   13