DTC P0102: Mass or Volume Air Flow Circuit Low Input; DTC P0103: Mass or Volume Air Flow Circuit High Input [08/2014 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power 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

Result:  B

B 

See step  5

Result:  A

A 

See step  2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the mass air flow meter sub-assembly connector.
2. Turn the power switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   D5-3 (+B) - Body ground	Power switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

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

Result:  NG

NG 

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

Result:  OK

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
   D5-5 (VG) - D27-94 (VG)	Always	Below 1 Ω
   D5-4 (E2G) - D27-117 (E2G)	Always	Below 1 Ω
   D5-5 (VG) or D27-94 (VG) - Body ground	Always	10 kΩ or higher

Result:  NG

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result:  OK

OK 

See step  4

1. Perform On-vehicle inspection (See article. Refer to ON-VEHICLE INSPECTION [08/2014 - ] ).
2. Perform Inspection (See article. Refer to INSPECTION [08/2014 - ] ).
3. Inspect the function of the mass air flow meter sub-assembly.
   1. Connect the Techstream to the DLC3.
   2. Turn the power switch on (IG).
   3. Turn the Techstream on.
   4. Put the engine in inspection mode (maintenance mode) (See article. Refer to INSPECTION MODE PROCEDURE [08/2014 - ] ).
   5. Start the engine.
   6. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / MAF.
   7. Check that the reading of 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 (See article. Refer to INITIALIZATION [08/2014 - ] ).

Result:  OK

OK 

REPLACE ECM 

(See article. Refer to REMOVAL [08/2014 - ] )

Result:  NG

NG 

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY 

(See article. Refer to REMOVAL [08/2014 - ] )

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
   D5-4 (E2G) - Body ground	Always	Below 1 Ω

   HINT: 

   Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly (See article. Refer to INITIALIZATION [08/2014 - ] ).

Result:  OK

OK 

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY 

(See article. Refer to REMOVAL [08/2014 - ] )

Result:  NG

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
   D5-4 (E2G) - D27-117 (E2G)	Always	Below 1 Ω

Result:  OK

OK 

REPLACE ECM 

(See article. Refer to REMOVAL [08/2014 - ] )

Result:  NG

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR