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 engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
5. Read the DTCs.
   RESULT
   
   

   Result	Proceed to
   DTC P0102 is output	A
   DTC P0103 is output	B

B → See step   6 

A: Go to next step 

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1. Disconnect the Mass Air Flow (MAF) meter connector.
2. Turn the engine switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   C3-1 (+B) - Body ground	Engine switch on (IG)	11 to 14 V

NG → See step   5 

OK: Go to next step 

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C3-3 (VG) - C53-74 (VG)	Always	Below 1 Ω
   C3-2 (E2G) - C53-75 (E2G)	Always	Below 1 Ω
   C3-3 (VG) or C53-74 (VG) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Inspect the mass air flow meter, referring to the On-vehicle Inspection for Mass Air Flow Meter. Refer to ON-VEHICLE INSPECTION [01/2012 - ] .
2. Inspect the mass air flow meter, referring to the Inspection for Mass Air Flow Meter. Refer to INSPECTION [01/2012 - ] .
3. Inspect the function of the mass air flow meter.
   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. Check that the mass air flow meter value changes when the engine is raced.

      OK

      The reading changes.

NG → See step   8 

OK → See step   9 

1. Check the EFI NO. 2 fuse.
   1. Remove the EFI NO. 2 fuse from the engine room relay block.
   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      EFI NO. 2 fuse	Always	Below 1 Ω

   3. Reinstall the EFI NO. 2 fuse.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C3-1 (+B) - 1B-4	Always	Below 1 Ω
   C3-1 (+B) or 1B-4 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   10 

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C3-3 (VG) - C53-74 (VG)	Always	Below 1 Ω
   C3-2 (E2G) - C53-75 (E2G)	Always	Below 1 Ω
   C3-3 (VG) or C53-74 (VG) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C3-2 (E2G) - Body ground	Always	Below 1 Ω

NG → See step   12 

OK → See step   11