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 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

B → See step   5 

A: Go to next step 

Fig 1: Identifying Mass Air Flow Meter Sub-Assembly Connector (Power Source Voltage)

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	Switch Condition	Specified Condition
   C1-3 (+B) - Body ground	Power switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

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

4. Reconnect the mass air flow meter sub-assembly connector.

NG → See step   7 

OK: Go to next step 

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

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   C1-5 (VG) - C28-74 (VG)	Always	Below 1 Ω
   C1-4 (E2G) - C28-73 (EVG)	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   C1-5 (VG) or C28-74 (VG) - Body ground	Always	10 kΩ or higher

4. Reconnect the mass air flow meter sub-assembly connector.
5. Reconnect the hybrid vehicle control ECU connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

Fig 2: Identifying Mass Air Flow Meter Sub-Assembly

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 sub-assembly.
   1. Remove the mass air flow meter sub-assembly with the connector connected.
   2. Connect the Techstream to the DLC3.
   3. Turn the power switch on (IG).
   4. Turn the Techstream on.
   5. Enter the following menus: Powertrain / Engine and ECT / Data List / MAF.
   6. Blow air into the mass air flow meter sub-assembly and check that the intake air amount reading changes.

      OK

      The reading changes.

NG → See step   13 

OK → See step   11 

Fig 3: Identifying C1 Mass Air Flow Meter Sub-Assembly Connector (Sensor Ground)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 (Check for Open)

   Tester Connection	Condition	Specified Condition
   C1-4 (E2G) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

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

3. Reconnect the mass air flow meter sub-assembly connector.

NG → See step   6 

OK → See step   13 

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

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   C1-4 (E2G) - C28-73 (EVG)	Always	Below 1 Ω

4. Reconnect the mass air flow meter sub-assembly connector.
5. Reconnect the hybrid vehicle control ECU connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   11 

1. Inspect the integration relay. Refer to INSPECTION .

NG → See step   12 

OK: Go to next step 

1. Remove the integration relay from the engine room relay block.
2. Disconnect the integration relay connector.
3. Disconnect the mass air flow meter sub-assembly connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   1B-4 - C1-3 (+B)	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   1B-4 or C1-3 (+B) - Body ground	Always	10 kΩ or higher

5. Reconnect the mass air flow meter sub-assembly connector.
6. Reconnect the integration relay connector.
7. Reinstall the integration relay.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - EFI MAIN RELAY)