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. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
5. Read the DTCs.
   RESULT
   
   

   Result	Proceed to
   P0102 is output	A
   P0103 is output	B

B → See step   5 

A: Go to next step 

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1. Disconnect the mass air flow 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
   C27-1 (+B) - Body ground	Engine switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   7 

OK: Go to next step 

1. Disconnect the mass air flow 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
   C27-3 (VG) - C29-14 (VG)	Always	Below 1 Ω
   C27-2 (E2G) - C29-13 (E2G)	Always	Below 1 Ω
   C27-3 (VG) or C29-14 (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. Refer to ON-VEHICLE INSPECTION [06/2012 - ] - Step 1 .

NG → See step   8 

OK → See step   9 

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

   Tester Connection	Condition	Specified Condition
   C27-2 (E2G) - Body ground	Always	Below 1 Ω

NG → See step   6 

OK → See step   8 

1. Disconnect the mass air flow 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
   C27-3 (VG) - C29-14 (VG)	Always	Below 1 Ω
   C27-2 (E2G) - C29-13 (E2G)	Always	Below 1 Ω
   C27-3 (VG) or C29-14 (VG) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   9 

1. Disconnect the mass air flow meter connector.
2. Remove the No. 1 integration relay from the engine room relay block.
3. Measure the resistance according to the value(s) in the table below.
   STANDARD RESISTANCE
   
   

   Tester Connection	Condition	Specified Condition
   C27-1 (+B) - 1B-4	Always	Below 1 Ω
   C27-1 (+B) or 1B-4 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE NO. 1 INTEGRATION RELAY