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 / Trouble Codes.
5. Read the DTCs.

   Result

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

B → See step   5 

A: Go to next step 

1. Disconnect the E83 Mass Air Flow (MAF) meter connector.
   Fig 1: Identifying E83 Mass Air Flow (MAF) Meter Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the engine switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Specified Condition
   E83-3 (+B) - Body ground	11 to 14 V

4. Reconnect the MAF meter connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (MASS AIR FLOW METER - EFI MAIN RELAY) 

OK: Go to next step 

1. Disconnect the E83 MAF meter connector.
2. Disconnect the E6 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance (Check for open)

   Tester Connection	Specified Condition
   E83-5 (VG) - E6-27 (VG)	Below 1 Ω
   E83-4 (E2G) - E6-26 (E2G)	Below 1 Ω

   Standard resistance (Check for short)

   Tester Connection	Specified Condition
   E83-5 (VG) or E6-27 (VG) - Body ground	10 kΩ or higher

4. Reconnect the MAF meter connector.
5. Reconnect the ECM connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Perform On-vehicle Inspection. Refer to ON-VEHICLE INSPECTION .
2. Perform Inspection. Refer to INSPECTION .
3. Inspect the function of the mass air flow meter.
   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 / Data List / All Data / MAF.
   5. Start the engine.
   6. Check that the reading of the mass air flow meter changes when the engine is raced.

      OK

      The reading changes.

NG → See step   7 

OK → See step   8 

1. Disconnect the E83 MAF meter connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Specified Condition
   E83-4 (E2G) - Body ground	Below 1 Ω

3. Reconnect the MAF meter connector.

NG → See step   6 

OK → See step   7 

1. Disconnect the E83 MAF meter connector.
2. Disconnect the E6 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance (Check for open)

   Tester Connection	Specified Condition
   E83-4 (E2G) - E6-26 (E2G)	Below 1 Ω

4. Reconnect the ECM connector.
5. Reconnect the MAF meter connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   8