DTC P0102: Mass Air Flow Circuit Low; DTC P0103: Mass Air Flow Circuit High [08/2013 - 08/2016]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
5. Read the DTCs.

   Powertrain > Engine and ECT > Trouble Codes 

   Result

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

Result: 

B 

See step  5

Result: 

A 

See step  2

1. Disconnect the mass air flow meter sub-assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Mass Air Flow Meter Sub-assembly)

2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   B2-3 (+B) - Body ground	Ignition switch ON	11 to 14 V

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - EFI-MAIN RELAY) 

Result: 

OK 

See step  3

1. Disconnect the mass air flow meter sub-assembly 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
   B2-5 (VG) - B33-91 (VG)	Always	Below 1 Ω
   B2-4 (E2G) - B33-92 (E2G)	Always	Below 1 Ω
   B2-5 (VG) or B33-91 (VG) - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Inspect the mass air flow meter sub-assembly, referring to the On-vehicle Inspection for Mass Air Flow Meter.

   Refer to ON-VEHICLE INSPECTION [08/2013 - ]

2. Inspect the mass air flow meter sub-assembly, referring to the Inspection for Mass Air Flow Meter.

   Refer to INSPECTION [08/2013 - ]

3. Inspect the function of the mass air flow meter sub-assembly.
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch to ON.
   3. Turn the Techstream on.
   4. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / MAF.

      Powertrain > Engine and ECT > Data List 

      Tester Display
      MAF

   5. Start the engine.
   6. Check that the MAF value changes when the engine is raced.

      OK

      The reading changes.

      HINT: 

      Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.

      Refer to INITIALIZATION [08/2013 - 08/2016]

Result: 

OK 

REPLACE ECM. Refer to  REMOVAL [08/2013 - 08/2016] 

Result: 

NG 

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY. Refer to  REMOVAL [08/2013 - ] 

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   B2-4 (E2G) - Body ground	Always	Below 1 Ω

   HINT: 

   Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.

   Refer to INITIALIZATION [08/2013 - 08/2016]

Result: 

OK 

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY. Refer to  REMOVAL [08/2013 - ] 

Result: 

NG 

See step  6

1. Disconnect the mass air flow meter sub-assembly 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
   B2-4 (E2G) - B33-92 (E2G)	Always	Below 1 Ω

Result: 

OK 

REPLACE ECM. Refer to  REMOVAL [08/2013 - 08/2016] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR