Inspection Procedure

HINT.

Read freeze frame data using the Techstream The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction

1. READ VALUE USING TECHSTREAM (MASS AIR FLOW RATE) 
   1. Connect the Techstream to the DLC3
   2. Start the engine.
   3. Turn the Techstream ON.
   4. Enter the following menus Powertrain / Engine / Data List / MAF
   5. Read the values displayed on the Techstream
      NOTE: During the test, do not use the exhaust air duct to perform suction on the exhaust pipe.

      Result 

      RESULT CHART
      
      

      Mass Air Flow Rate (g/sec.)	Proceed to
      0.0	A
      0.62 or more	B
      Between 0.0 and 0 62	C

   B: Go to step  6

   C: CHECK FOR INTERMITTENT PROBLEMS  (See CHECK FOR INTERMITTENT PROBLEMS )

   A: Go to next step 

2. INSPECT MASS AIR FLOW METER (POWER SOURCE VOLTAGE) 
   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 SPECIFIED CONDITION CHART
      
      

      Tester Connection	Switch Condition	Specified Condition
      E29-3 (+B) - Body ground	Engine switch on (IG)	11 to 14 V

   4. Reconnect the mass air flow meter connector
   Fig 1: Identifying Mass Air Flow Meter Connector E29
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: Go to step  5

   OK: Go to next step 

3. INSPECT ECM (VG VOLTAGE) 
   1. Start the engine
   2. Measure the voltage according to the value(s) in the table below.

      HINT

      The shift lever should be in P or N and the air conditioning switch should be turned off

      Standard Voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      E3-25 (VG) - E3-24 (E2G)	Engine idling	0 5 to 3 0 V

   Fig 2: Identifying ECM Connector Terminals
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: Go to step 4 

   OK: REPLACE ECM  (See REMOVAL )

4. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) 
   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 (Check for Open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      E29-5 (VG) - E3-25 (VG)	Always	Below 1 Ω
      E29-4 (E2G) - E3-24 (E2G)	Always	Below 1 Ω

      Standard Resistance (Check for Short) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      E29-5 (VG) or E3-25 (VG) - Body ground	Always	10 kΩ or higher

   4. Reconnect the mass air flow meter connector
   5. Reconnect the ECM connector
   Fig 3: Identifying Mass Air Flow Meter Connector E29 And ECM Connector Terminals
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE MASS AIR FLOW METER  (See REMOVAL )

5. CHECK FUSE (EFI NO. 2 FUSE) 
   1. Remove the EFI No. 2 fuse from the engine room No. 2 relay block
   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      EFI No. 2 fuse	Always	Below 1 Ω

   3. Reinstall the EFI No. 2 fuse.
   Fig 4: Identifying EFI No 2 Fuse From Engine Room No. 2 Relay Block
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE 

   OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI NO. 2 FUSE - MASS AIR FLOW METER) 

6. INSPECT ECM (SENSOR GROUND) 
   1. Measure the resistance according to the value(s) in the table below

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      E3-24 (E2G) - Body ground	Always	Below 1 Ω

   Fig 5: Identifying EFI No 2 Fuse
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPLACE ECM  (See REMOVAL )

   OK: Go to next step 

7. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) 
   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 (Check for Open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      E29-5 (VG) - E3-25 (VG)	Always	Below 1 Ω
      E29-4 (E2G) - E3-24 (E2G)	Always	Below 1 Ω

      Standard Resistance (Check for Short) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      E29-5 (VG) or E3-25 (VG) - Body ground	Always	10 kΩ or higher

   4. Reconnect the mass air flow meter connector
   5. Reconnect the ECM connector
   Fig 6: Identifying Mass Air Flow Meter Connector E29 And ECM Connector Terminals
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE MASS AIR FLOW METER  (See REMOVAL )