DTC P0102: Mass Air Flow Circuit Low; DTC P0103: Mass Air Flow Circuit High [09/2014 - ]: Procedure

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the mass air flow meter sub-assembly 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	Condition	Specified Condition
   F39-3 (5V) - F39-2 (E2G)	Engine switch on (IG)	4.8 to 5.2 V
   F39-1 (FG) - F39-2 (E2G)	Engine switch on (IG)	4.8 to 5.2 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  4

Result: 

OK 

See step  2

1. Inspect the mass air flow meter sub-assembly.

   Refer to ON-VEHICLE INSPECTION [09/2014 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  3

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [09/2014 - ]

   Powertrain > Engine > Clear DTCs 

4. Turn the engine switch off and wait for at least 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on.
6. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
7. Enter the following menus: Powertrain / Engine / Trouble Codes.
8. Read the DTCs.

   Powertrain > Engine > Trouble Codes 

   Result

   Result	Proceed to
   DTC P0102 or P0103 is output	A
   DTCs are not output	B

Result: 

A 

REPLACE ECM. Refer to  REMOVAL [09/2014 - ] 

Result: 

B 

END 

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
   F1-21 (VCVG) - F39-3 (5V)	Always	Below 1 Ω
   F1-23 (VG) - F39-1 (FG)	Always	Below 1 Ω
   F1-24 (E2G) - F39-2 (E2G)	Always	Below 1 Ω
   F1-21 (VCVG) or F39-3 (5V) - Body ground	Always	10 kΩ or higher
   F1-23 (VG) or F39-1 (FG) - Body ground	Always	10 kΩ or higher
   F1-24 (E2G) or F39-2 (E2G) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ECM. Refer to  REMOVAL [09/2014 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR